WO2022059794A1 - Il-2変異体タンパク質及びこれを含む医薬 - Google Patents
Il-2変異体タンパク質及びこれを含む医薬 Download PDFInfo
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- WO2022059794A1 WO2022059794A1 PCT/JP2021/034438 JP2021034438W WO2022059794A1 WO 2022059794 A1 WO2022059794 A1 WO 2022059794A1 JP 2021034438 W JP2021034438 W JP 2021034438W WO 2022059794 A1 WO2022059794 A1 WO 2022059794A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/52—Cytokines; Lymphokines; Interferons
- C07K14/54—Interleukins [IL]
- C07K14/55—IL-2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/30—Non-immunoglobulin-derived peptide or protein having an immunoglobulin constant or Fc region, or a fragment thereof, attached thereto
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/31—Fusion polypeptide fusions, other than Fc, for prolonged plasma life, e.g. albumin
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/61—Fusion polypeptide containing an enzyme fusion for detection (lacZ, luciferase)
Definitions
- IL-2 is known to stimulate a variety of immune cells, including monocytes, NK cells and T cells. IL-2 is used in hospitals to stimulate cell-mediated immune responses and is FDA-approved as standard treatment in patients with metastatic melanoma or metastatic renal cancer (eg, Ardes Roykin (also known as Proleukin). Registered trademark))).
- the T cell repertoire involved in the cellular adaptive immune response includes CD8 + memory T cells, CD8 + effector T cells and regulatory T cells (Treg). These Tregs play an important role in the adaptive immune program by reducing the activity of effector T cells and memory T cells.
- Tregs play an important role in the adaptive immune program by reducing the activity of effector T cells and memory T cells.
- IL-2 can also activate a Treg subset of T cells, which in turn can act to suppress CD8 + T cells or tolerate other T cells. Therefore, IL-2 is involved in both the activation and attenuation of adaptive immune responses.
- Treg cells are characterized by the expression of CD4 and the transcription factor FoxP3, which in turn activates the expression of CD25, the ⁇ subunit of the IL-2 receptor complex (CD4 + CD25 + cells).
- CD25 is constitutively expressed in Treg cells. Due to the association of CD25 with the signaling components of the IL-2 receptor complex ( ⁇ subunit CD122 and ⁇ subunit CD132), the medium-affinity IL-2 receptor complex becomes a high-affinity IL-2 receptor complex. Is converted to. IL-2 activation of Treg cells occurs through signaling pathways relayed by the high affinity IL-2 receptor complex.
- High levels of CD25 expression are characteristic of activated T cells, and these cells become sensitive to IL-2 via the high affinity IL-2 receptor complex.
- Theoretical evidence that blockade of CD25 inhibits IL-2-mediated signaling in activated T cells and exhibits immunosuppressive effects has led to the development of therapies based on blockade of CD25.
- Anti-CD25 antibodies such as daclizumab (Roche) (also known as Zenapax®) and basiliximab (Novartis) (also known as Simulect®) have been approved by the FDA for the prevention of acute organ rejection after kidney transplantation. .. Due to the dual role of IL-2, there is still a need to provide more effective IL-2 mediated therapy in the art.
- Immune cells involved in the cell-mediated immune response include NK cells having an NK1.1 + phenotype. NK cells play an important role in the adaptive immune program. However, it has been observed that IL-2 can also activate a Treg subset of T cells, which in turn can act to suppress CD8 + T cells or tolerate other T cells. Therefore, IL-2 is involved in both the activation and attenuation of adaptive immune responses.
- High levels of CD25 expression are characteristic of activated T cells, and these cells become sensitive to IL-2 via the high affinity IL-2 receptor complex.
- Theoretical evidence that blockade of CD25 inhibits IL-2-mediated signaling in activated T cells and exhibits immunosuppressive effects has led to the development of therapies based on blockade of CD25.
- Anti-CD25 antibodies such as daclizumab (Roche) (also known as Zenapax®) and basiliximab (Novartis) (also known as Simulect®) have been approved by the FDA for the prevention of acute organ rejection after kidney transplantation. .. Due to the dual role of IL-2, there is still a need to provide more effective IL-2 mediated therapy in the art.
- An object of the present invention is to provide an IL-2 mutant in which the binding property to IL-2 receptor ⁇ is attenuated while maintaining the binding property to IL-2 receptor ⁇ and ⁇ .
- IL-2 receptor ⁇ and ⁇ were obtained by substituting all the amino acids at positions 35, 38, 42 (or 43) and 45 of mature IL-2 with A. It was found that the binding property to IL-2 receptor ⁇ is attenuated while maintaining the binding property to IL-2 receptor ⁇ .
- the present invention is based on such novel findings. Accordingly, the present invention provides the following sections: Item 1. All amino acids at positions 35, 38, 42 or 43, and 45 have at least 95% sequence identity with respect to the amino acid sequence represented by SEQ ID NO: 3 or the amino acid sequence of SEQ ID NO: 3. An IL-2 variant protein having an amino acid sequence of A.
- Item 2 The IL-2 mutant protein according to Item 1, which is a fusion protein with albumin and / or immunoglobulin.
- Item 3 The IL-2 mutant protein according to Item 2, wherein the immunoglobulin portion is the Fc portion of the antibody.
- Item 4 Albumin-IL-2, IL-2-albumin, albumin-IL-2-immunoglobin, immunoglobulin-IL-2-albumin, albumin-immunoglobulin-IL-2-albumin or albumin-IL-2-immunoglobulin- Item 2.
- IL-2 receptor has the ability to activate TPA-Mat cells expressing IL-2 receptors ⁇ and ⁇ , and is compared with the IL-2 mutant protein consisting of the amino acid sequence represented by SEQ ID NO: 2.
- Item 6. The IL-2 mutant protein according to any one of Items 1 to 4, wherein the binding property to body ⁇ is suppressed.
- Item 6 A drug comprising the IL-2 mutant protein according to any one of Items 1 to 5.
- Item 7. The medicine according to Item 6 for preventing or treating cancer.
- Item 8 A method for preventing or treating cancer, which comprises administering an effective amount of the IL-2 mutant protein according to any one of Items 1 to 5 to a subject in need thereof.
- Item 9 Use of the IL-2 mutant protein according to any one of Items 1 to 5 for producing a preventive or therapeutic agent for cancer.
- the present invention it is possible to provide an IL-2 mutant in which the binding property to IL-2 receptor ⁇ and ⁇ is attenuated while maintaining the binding property to IL-2 receptor ⁇ and ⁇ . Therefore, by using the IL-2 mutant of the present invention, the effectiveness of IL-2 therapy can be enhanced by suppressing the proliferation of Treg (CD4 + CD25 +) while retaining the ability to proliferate CD8 + T cells and NK1.1 + cells. Can be enhanced.
- FIG. 1 is a mature human IL-2 amino acid sequence (SEQ ID NO: 1).
- FIG. 2 is a mature stable mutant human IL-2 amino acid sequence (SEQ ID NO: 2).
- FIG. 3 shows the mature stable IL-2 receptor alpha subunit (CD25) unbound human IL-2 amino acid sequence (MK-6 (SEQ ID NO: 3), MK-15 (SEQ ID NO: 4) and mature stable variant. Human IL-2 amino acid sequence MK-4 (SEQ ID NO: 5))).
- FIG. 4 is a mature human albumin amino acid sequence (SEQ ID NO: 6).
- FIG. 5 shows the mature human albumin-MK-6-IL-2 amino acid sequence (HSA-3xG4S-MK-6) (SEQ ID NO: 7) and the mature human albumin-MK-15-IL-2 amino acid sequence (HSA-3xG4S-).
- MK-15 SEQ ID NO: 8
- mature human albumin-3x EAAAK
- EAAAK mature human albumin-3x
- EAAAK mature human albumin-2 amino acid sequence
- SEQ ID NO: 9 and mature human albumin- 3x (EAAAK) -MK-15-IL-2 amino acid sequence
- HSA-3x (EAAAK) -MK-6) SEQ ID NO: 10
- FIG. 10 shows the mature human albumin-MK-6-IL-2 amino acid sequence (HSA-3xG4S-MK-6) (SEQ ID NO: 7) and the mature human albumin-MK-15-IL-2 amino acid sequence (HSA-3xG4S-).
- MK-15 SEQ ID NO: 8
- mature human albumin-3x
- FIG. 6 shows the amino acid sequence of the mouse albumin protein (SEQ ID NO: 11), the amino acid sequence of the mature MK-6 mouse albumin fusion protein (SEQ ID NO: 12), the amino acid sequence of the mature MK-14 mouse albumin fusion protein (SEQ ID NO: 13) and Amino acid sequence of mature MK-15 mouse albumin fusion protein (SEQ ID NO: 14).
- FIG. 7A shows a human anti-CSPG4-scFv amino acid sequence (SEQ ID NO: 15), a mature human albumin-CSPG4-scFv-MK-6-IL-2-amino acid sequence (HSA-CSPG4-scFv-MK-6) (SEQ ID NO: 16).
- FIG. 7B is a mature human albumin-CSPG4-scFv-MK-15-IL-2-amino acid sequence (HSA-CSPG4-scFv-MK-15) (SEQ ID NO: 18).
- FIG. 8 is a linker amino acid sequence (SEQ ID NOs: 21 and 25) linking mature MK-6 and albumin.
- FIG. 9 (top) is a schematic binding diagram of the IL-2 / IL-2 receptor ⁇ complex.
- FIG. 9 (bottom) is a schematic three-dimensional structure diagram relating to the binding between the IL-2 / IL-2 receptor ⁇ complex and IL-2.
- FIG. 10 shows IL-2 receptor ⁇ -binding on cells.
- FIG. 11 shows IL-2 receptor ⁇ -binding on cells.
- FIG. 12 shows human CSPG4 binding on cells.
- FIG. 13 shows IL-2-dependent cell proliferation of mouse and human lymphocytes by IL-2, MK-14 and MK-6.
- FIG. 14 shows IL-2-dependent cell proliferation of mouse and human lymphocytes by MK-4, MK-6, MK-14 and MK-15.
- FIG. 15 shows IL-2-dependent cell proliferation of mouse and human lymphocytes by MK-6, HSA-3xG4S-MK-6 and HSA-3x (EAAAK) -MK-6.
- FIG. 16 shows IL-2-dependent cell proliferation of mouse and human lymphocytes by MK-6, HSA-CSPG4-scFv-3xG4S-MK-6 and HSA-CSPG4-scFv-3xG4S-MK-14.
- FIG. 17 shows IL-2-dependent Treg cell proliferation.
- FIG. 18 shows the effect on peripheral immune system cell count in mice (BALB / c) treated with IL-2 (MK-6-IL-2 or MK-14-IL-2).
- FIG. 19 shows the body weight, liver, and spleen of mice (BALB / c) intravenously administered with IL-2 (MK-6-IL-2 or MK-14-IL-2) once daily for 4 consecutive days. Shows the effect on weight.
- FIG. 20 shows the effect of IL-2 (MK-6-IL-2 or MK-14-IL-2) on cancer-bearing mice (BALB / c) subcutaneously transplanted with CT26 colorectal cancer cells.
- FIG. 21 shows mice subcutaneously transplanted with CT26 colorectal cancer cells (BALB / c) and IL-2 (MK-6-IL-2 or MK-14-IL-2) in the abdominal cavity twice a day for 5 consecutive days.
- FIG. 22 shows the effect of IL-2 (MK-6-IL-2 or MK-14-IL-2) on cancer-bearing mice (C57BL / 6) subcutaneously transplanted with B16F10 malignant melanoma.
- FACS analysis of intratumoral lymphocytes (TIL) by IL-2 monotherapy in B16F10 malignant melanoma-bearing model mice is shown.
- FIG. 24 shows the antitumor effect of albumin-fused IL-2 (MSA-IL-2) monotherapy in CT26 colorectal cancer-bearing model mice.
- 25 shows changes in IL-2 blood concentration after intraperitoneal administration of mature MK-6-IL-2 and mature MK-6-IL-2-mouse albumin and intratumoral IL in CT26 colorectal cancer-bearing model mice. The quantification of -2 is shown.
- protein (protein) and “peptide” are used in the sense of including oligopeptides and polypeptides. Further, in the present specification, “protein” and “peptide” are used to include both proteins modified by sugar chains and the like and unmodified proteins, unless otherwise specified. This also applies to proteins that are not specified to be proteins.
- IL-2 variant protein The present invention has at least 95% sequence identity to the amino acid sequence represented by SEQ ID NO: 3 or the amino acid sequence of SEQ ID NO: 3 and is at positions 35, 38, 42 or Provided is an IL-2 mutant protein having an amino acid sequence in which the amino acids at positions 43 and 45 are all A. Therefore, the present invention has the amino acid sequence represented by SEQ ID NO: 3; at least 95% sequence identity with respect to the amino acid sequence of SEQ ID NO: 3, and the amino acids at positions 35, 38, 42 and 45. Amino acid sequence in which is all A; or an amino acid sequence having at least 95% sequence identity to the amino acid sequence of SEQ ID NO: 3 and in which the amino acids at positions 35, 38, 43 and 45 are all A.
- an IL-2 variant protein having.
- the IL-2 variant protein having the amino acid sequence represented by SEQ ID NO: 3 is not limited to the IL-2 variant protein whose amino acid sequence consists only of the amino acid sequence represented by SEQ ID NO: 3. It also includes an IL-2 variant protein whose amino acid sequence includes the amino acid sequence represented by SEQ ID NO: 3 as a part thereof.
- amino acids having at least 95% sequence identity to the amino acid sequence of SEQ ID NO: 3 and in which the amino acids at positions 35, 38, 42 or 43 and 45 are all A.
- An IL-2 variant protein having a sequence has an amino acid sequence having at least 95% sequence identity to the amino acid sequence of SEQ ID NO: 3 and has positions 35, 38, 42 or 43 and 45.
- the amino acid sequence is all A, but also the amino acid sequence has at least 95% sequence identity with respect to the amino acid sequence of SEQ ID NO: 3, and the amino acid sequence at position 35 , 38, 42 or 43 and 45 are all A amino acid sequences including an IL-2 variant protein as a part thereof.
- SEQ ID NO: 2 shows the amino acid sequence of the mature stable mutant human IL-2.
- the amino acid sequence represented by SEQ ID NO: 3 corresponds to a sequence in which K at position 35, R at position 38, K at position 43 and Y at position 45 are all replaced with A in SEQ ID NO: 2.
- the amino acid sequence represented by SEQ ID NO: 4 corresponds to a sequence in which K at position 35, R at position 38, F at position 42 and Y at position 45 are all replaced with A in SEQ ID NO: 2.
- IL-2 / IL-2 receptor binding and MK-6-IL-2 (described in Examples below) and IL-2 receptor which are one typical embodiment of the present invention. The outline of the binding is shown in FIG. Specifically, FIG.
- FIG. 9 (top) is a schematic binding diagram of the IL-2 / IL-2 receptor ⁇ complex.
- Mature human IL-2 (and mature modified human IL-2) binds to the high affinity IL-2 receptor ⁇ complex.
- mature MK-6-IL-2 does not bind to the ⁇ subunit but to the intermediate affinity IL-2 receptor consisting of ⁇ .
- FIG. 9 (bottom) is a schematic three-dimensional structure diagram relating to the binding between the IL-2 / IL-2 receptor ⁇ complex and IL-2.
- the three-dimensional structural schematic diagram of each protein in FIG. 9 (bottom) was created using publicly known data (2ERJ) of a protein structure data bank (PDB: Protein Data Bank).
- IL-2 receptor ⁇ is widely expressed in vascular endothelial cells, Treg cells, activated T cells, and the like. Mature human IL-2 (and mature modified human IL-2) binds to cells that express IL-2 receptor ⁇ alone. This causes the following multiple adverse events. The first is vascular leakage syndrome (VLS), which is sometimes fatal because it binds to vascular endothelial cells that express IL-2 receptor ⁇ alone, which enhances vascular permeability. Causes edema and multiple organ failure. The second adverse event is the activation of Tregs. Since Treg suppresses antitumor immunity, it induces cancer growth and metastasis / infiltration.
- VLS vascular leakage syndrome
- Treg suppresses antitumor immunity, it induces cancer growth and metastasis / infiltration.
- IL-2R Three subunits of the IL-2 receptor (IL-2R) have been identified: ⁇ (CD25), ⁇ (CD122) and ⁇ c (CD132).
- IL-2R ⁇ is a low-affinity receptor alone
- IL-2R ⁇ and ⁇ c heterodimers are intermediate-affinity receptors
- ⁇ is a high-affinity receptor, but only the latter two have signal transduction.
- the tyrosine kinases JAK1 and JAK3 associate with IL-2R ⁇ and ⁇ c, respectively, and mainly activate STAT5.
- activation of PI3K, Akt and MAPK systems occurs.
- IL-2 acts on T cell proliferation.
- One of its effects is the proliferation and activation of antigen-stimulated CD8 + T cells.
- IL-2 controls antigen-dependent proliferation over all stages of naive effector memory differentiation. At least some of the CD8 + T cells are called cytotoxic T cells or killer T cells and are known to kill tumor cells that present cancer-related antigens. Furthermore, NK cells express an intermediate affinity IL-2 receptor consisting of ⁇ , and are proliferated and activated by IL-2 stimulation to exhibit cytotoxic activity including antitumor activity. On the other hand, IL-2 is required for the differentiation of both endogenous Tregs (nTregs) formed in the thymus and inducible Tregs (iTregs) formed in the periphery.
- nTregs endogenous Tregs
- iTregs inducible Tregs
- Treg cells are constitutively high in IL2R ⁇ , a high-affinity IL-2 receptor composed of IL2 receptor ⁇ -subunit (CD25), IL2 receptor ⁇ -subunit (CD122), and IL2RG-subunit (CD132). Characterized by expression at levels, Treg cell proliferation has been shown to be IL-2 dependent.
- antitumor immunity it is known that antitumor immunity does not function effectively due to immunosuppression by Treg cells, and activation of antitumor activity is not induced, resulting in tumor growth and metastatic infiltration.
- Non-Patent Document 1 a dozen or more amino acids among the amino acids constituting IL-2 are present in the appendix of the binding portion between IL-2 and IL-2 receptor ⁇ . ..
- the present inventors have made numerous studies to reduce the binding property between IL-2 and IL-2 receptor ⁇ , and have conceived to mutate one of these dozens of amino acids.
- the IL-2 mutant protein having the amino acid sequence shown in SEQ ID NO: 3 becomes IL-2 receptor ⁇ while maintaining the binding property to IL-2 receptor ⁇ and ⁇ .
- the attenuated binding property is that the K at the 35th position, the R at the 38th position, the F at the 42nd position or the K at the 43rd position and the Y at the 45th position are all replaced with A, which are in contact with the IL-2 receptor ⁇ . It is probable that it was done. Therefore, the IL-2 variant protein of the present invention is sequenced so as to conserve all A at positions 35, 38, and 45, and conserve A at position 43 or have A at position 42. One or several from the amino acid sequence represented by No.
- the IL-2 variant protein may have an amino acid sequence obtained by adding, deleting and / or substituting the amino acids of.
- the IL-2 variant protein preferably has at least 95% sequence identity to the amino acid sequence represented by SEQ ID NO: 3 or the amino acid sequence of SEQ ID NO: 3, preferably at least 97% sequence. It is more preferred to have identity, more preferably at least 99% sequence identity.
- a at positions 35, 38, and 45 are all preserved, and A is preserved at position 43 or A at position 42.
- amino acid sequence obtained by adding, deleting and / or substituting an amino acid from the amino acid sequence shown in SEQ ID NO: 3 include the amino acid sequence represented by SEQ ID NO: 4.
- amino acids from the amino acid sequence represented by SEQ ID NO: 3 are preserved while preserving all A at positions 35, 38, 43 and 45.
- amino acid sequence obtained by adding, deleting and / or substituting the amino acid sequence in which the two amino acids between positions 81 and 84 are deleted and DTK is added in SEQ ID NO: 3, P in position 82 in SEQ ID NO: 3 is used.
- Examples thereof include an amino acid sequence, an amino acid sequence in which at least two of these modifications are combined, and the like.
- the IL-2 mutant protein is at positions 35, 38 and 45 from the amino acid sequence represented by SEQ ID NO: 3 or the amino acid sequence represented by SEQ ID NO: 3.
- It may be a fusion protein to which another amino acid sequence is fused, optionally via a linker.
- all A at positions 35, 38 and 45 from the amino acid sequence represented by SEQ ID NO: 3 or the amino acid sequence represented by SEQ ID NO: 3 are preserved.
- the portion consisting of the amino acid sequence to which one or several amino acids are added, deleted and / or substituted so that A is conserved at the 43rd position or A is held at the 42nd position is simply IL-2.
- IL-2 it may also be referred to as a variant protein portion.
- the IL-2 variant protein contains all A at positions 35, 38 and 45 from the amino acid sequence represented by SEQ ID NO: 3 or the amino acid sequence represented by SEQ ID NO: 3.
- the immunoglobulin moiety may be (a) an Fc moiety of an antibody and (b) an antibody that encloses a variable region (Fab moiety) for an antigen against an antigen molecule presented in a tumor cell or tumor cell environment.
- the term "immunoglobulin moiety” is not limited to those having an Fc moiety and a Fab moiety, but any fragment (eg, Fab partial fragment, single chain variable region fragment) within the range of antigen binding. (ScFv), variable region fragment of heavy chain antibody (variable domain of heavy chain of healthy chain antibody (VHH), etc.).
- the antibody having a variable region include anti-EGFR antibody Cetuximab, anti-Her2 antibody Trastuzumab, anti-CD20 antibody Rituximab and the like.
- fusion proteins examples include albumin-IL-2, IL-2-albumin, albumin-IL-2-immunoglobulin, immunoglobulin-IL-2-albumin, albumin-immunoglobulin-IL-2-albumin, and albumin.
- albumin examples include albumin (HSA) or a fragment or variant of albumin.
- HSA albumin
- domain III of human serum albumin has been shown to be highly bound to FCGRT (FcRn), and this domain alone or in combination with other domains with long or modified half-life. It is possible to make variants containing (eg, Albumin Flex Technology, Novozymes).
- the protein to be fused to the IL-2 mutant protein moiety include those derived from mammals such as humans. Further, the protein to be fused to the IL-2 mutant protein portion may be a humanized protein or the like.
- FIG. 5 an example of a mature human albumin-MK-6-IL-2 amino acid sequence (FIG. 5, SEQ ID NOs: 7-10), a mature MK-6-IL-2-mouse albumin-amino acid sequence. Examples (FIG.
- FIGS. 5 and 6 SEQ ID NOs: 12-14 are shown in FIGS. 5 and 6, respectively.
- the mature mouse albumin amino acid sequence (SEQ ID NO: 11) that constructs these fusion proteins is shown in FIG.
- the IL-2 mutant protein moiety and other proteins may be linked via a linker.
- the linker amino acid sequence may be either a so-called rigid linker or a flexible linker, and examples thereof include those described in Non-Patent Document 2, and specific examples thereof include those described in the following table: More specifically, in a preferred embodiment, the linker amino acid sequence includes, for example, one or several amino acid sequences represented by SEQ ID NO: 23 or 27 and the amino acid sequence represented by SEQ ID NO: 23 or 27 in FIG.
- Examples include sequences.
- the repeating sequence of GGGGS or GGGGS (for example, GGGGGS GGGGGS GGGGS) has flexible properties and retains the properties of each of the fused proteins. It is useful because it can be used.
- EAAAK or its repeating sequence can reliably maintain (separate) the distance between two protein domains, and is therefore unique to each protein functional domain. It is useful because it can be fused while retaining its function.
- the IL-2 mutant protein having the amino acid sequence represented by SEQ ID NO: 3 includes those modified by saccharification, acetylation and the like. In the present invention, those modified with sugar or the like are preferable. Further, in order to facilitate purification in the purification process described later, the mutant of the present invention is genetically engineered with a purification tag (for example, a polyhistine tag, Strep-tag®, etc.) at the N-terminal or C-terminal of the mutant. Also known as a secretory signal sequence (also known as a signal peptide or pre-sequence) as an N-terminal extension of the fusion protein to guide the fusion protein to the secretory pathway of the host cell.
- a purification tag for example, a polyhistine tag, Strep-tag®, etc.
- secretory signal sequence also known as a signal peptide or pre-sequence
- the DNA sequence encoding the signal peptide is typically attached to the 5'terminus of the DNA sequence encoding the fusion protein in the correct reading frame.
- the signal peptide is usually associated with the protein. It may be a related peptide, or it may be a gene-derived or artificial secretory sequence encoding another secreted protein.
- the IL-2 mutant protein of the present invention has the ability to activate cells expressing IL-2 receptors ⁇ and ⁇ , and from the amino acid sequence represented by SEQ ID NO: 2. It is preferable because the binding property to IL-2 receptor ⁇ is suppressed as compared with the IL-2 mutant protein.
- a method for producing such a mutant strain a method known per se (for example, the method described in Japanese Patent No. 6640834) is appropriately used to construct, for example, a gene cassette in which the above mutation is added to the IL-2 gene.
- the expression cassette is connected to a suitable vector suitable for the host to be adopted.
- the vector must be capable of containing the DNA sequence encoding the fusion protein to be expressed.
- Suitable host cells can be readily transformed among eukaryotic and prokaryotic cells in culture medium. Contains cells that can exhibit rapid proliferation. Specifically, preferred host cells are E. coli.
- Prokaryotic cells such as colli, Bacillus subtillus, as well as animal cells and yeast strains, such as S. cerevisiae. Includes eukaryotic cells such as cerevisiae. Mammalian cells, in particular Expi293F, ExpiCHO, HEK, ExJ558, NSO, SP2-O, or CHO, are generally preferred. Other suitable hosts include insect cells such as, for example, Sf9 cells. Stable transformed or transfected cell lines can then be selected. Furthermore, a transcriptional translation system in vitro can also be adopted as an expression system. Further, the mutant of the present invention may be produced using a cell-free protein synthesis system. Further, the obtained mutant of the present invention may be purified by an appropriate method known per se (filtration, centrifugation, chromatography, etc.).
- the invention provides a pharmaceutical containing the IL-2 mutant protein. Due to the effects of the IL-2 mutant protein described above, the present invention presents the invention to a receptor consisting of IL-2 receptor ⁇ and ⁇ , which is a modified IL-2 drug whose binding to IL-2 receptor ⁇ is attenuated. It is possible to provide a modified drug for IL-2, which increases the amount of IL-2.
- the pharmaceuticals of the present invention can be used, for example, to prevent and / or treat cancer.
- the target cancer includes, for example, solid cancer such as kidney cancer, melanoma, non-small cell lung cancer, colon cancer, hepatocellular carcinoma, head and neck cancer, non-Hodgkin's lymphoma, and blood such as acute myeloid leukemia.
- solid cancer such as kidney cancer, melanoma, non-small cell lung cancer, colon cancer, hepatocellular carcinoma, head and neck cancer, non-Hodgkin's lymphoma, and blood such as acute myeloid leukemia.
- system tumors include system tumors.
- IL-2 mutant protein itself, which is the active ingredient of the present invention, is used as a pharmaceutical
- various pharmaceutically acceptable carriers for example, isotonic agents, chelating agents, stabilizers, pH
- It may be used as a pharmaceutical composition in combination with a regulator, a preservative, an antioxidant, a solubilizing agent, a thickening agent, etc.).
- tonicity agent examples include saccharides such as glucose, trehalose, lactose, fructose, mannitol, xylitol and sorbitol, polyhydric alcohols such as glycerin, polyethylene glycol and propylene glycol, sodium chloride, potassium chloride and calcium chloride.
- saccharides such as glucose, trehalose, lactose, fructose, mannitol, xylitol and sorbitol
- polyhydric alcohols such as glycerin, polyethylene glycol and propylene glycol
- sodium chloride potassium chloride and calcium chloride
- examples include inorganic salts.
- the chelating agent examples include edetates such as disodium edetate, disodium calcium edetate, trisodium edetate, tetrasodium edetate, calcium edetate, ethylenediaminetetraacetic acid salt, nitrilotriacetic acid or a salt thereof, and hexametallin. Examples thereof include acid soda and citric acid.
- the stabilizer examples include sodium bisulfite and the like.
- Examples of the pH adjuster include acids such as hydrochloric acid, carbonic acid, acetic acid and citric acid, and further include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkali metal carbonates such as sodium carbonate or hydrogen carbonate. Examples thereof include salts, alkali metal acetates such as sodium acetate, alkali metal citrates such as sodium citrate, and bases such as tromethamol.
- preservatives include paraoxybenzoic acid esters such as sorbic acid, potassium sorbate, methyl paraoxybenzoate, ethyl paraoxybenzoate, propyl paraoxybenzoate, and butyl paraoxybenzoate, chlorhexidine gluconate, benzalkonium chloride, and chloride.
- examples thereof include quaternary ammonium salts such as benzethonium and cetylpyridinium chloride, alkylpolyaminoethylglycine, chlorobutanol, polyquad, polyhexamethylenebiguanide, chlorhexidine and the like.
- antioxidant examples include sodium hydrogen sulfite, dry sodium sulfite, sodium pyrosulfite, concentrated mixed tocopherol and the like.
- solubilizing agent examples include sodium benzoate, glycerin, D-sorbitol, glucose, propylene glycol, hydroxypropylmethylcellulose, polyvinylpyrrolidone, macrogol, D-mannitol and the like.
- thickening agent examples include polyethylene glycol, methyl cellulose, ethyl cellulose, carmellose sodium, xanthan gum, chondroitin sodium sulfate, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, polyvinylpyrrolidone, polyvinyl alcohol and the like.
- the above-mentioned pharmaceutical composition may further contain a compound which is said to have a preventive or therapeutic action on a target disease of the said drug, in addition to the IL-2 mutant protein.
- a compound which is said to have a preventive or therapeutic action on a target disease of the said drug in addition to the IL-2 mutant protein.
- examples of the compound known to have an antitumor effect include Cetuximab, Trastuzumab, Rituximab and the like.
- immune checkpoint inhibitors such as Nivolumab, Pembrolizumab, and Ipilimumab are preferable.
- the content of the IL-2 mutant protein in the composition is not particularly limited, and for example, 90% by mass or more, 70% by mass or more, 50% by mass or more, 30% by mass or more, 10 by mass. It can be appropriately set from conditions such as mass% or more, 5% by mass or more, and 1% by mass or more.
- the form of the preparation is not particularly limited, and for example, oral administration agents such as tablets, rounds, capsules, powders, granules and syrups; injections (intravenous injection, intramuscular injection, local injection, etc.), gargling agents, drip agents. , Various formulations such as external preparations (ointments, creams, patches, inhalants), parenteral administrations such as suppositories, and the like can be mentioned. Among the above-mentioned pharmaceutical forms, for example, oral administration agents (tablets, pills, capsules, powders, granules, syrups, etc.), external preparations (inhalants, ointments, creams, patches, etc.) and the like are preferable. Can be mentioned.
- the dose of the IL-2 mutant protein varies depending on the route of administration, the age, body weight, symptoms, etc. of the patient and cannot be unconditionally defined, but the daily dose for an adult is usually about 5000 mg or less, preferably about.
- the amount may be 1000 mg or less.
- the lower limit of the dose of the IL-2 mutant protein is not particularly limited, and the daily dose for an adult can be appropriately set in the range of usually 0.1 mg or more, preferably 0.5 mg or more. When administered once a day, this amount may be contained in one pharmaceutical product, and when administered three times a day, one third amount may be contained in one pharmaceutical product.
- the drug of the present invention is administered to a patient such as a mammal.
- mammals include humans, monkeys, mice, rats, rabbits, cats, dogs, pigs, cows, horses, sheep and the like, and humans are preferable.
- the invention prevents cancer, comprising administering to a subject in need thereof an effective amount of the IL-2 mutant protein according to any one of Items 1-5. Or provide a method of treatment.
- Example 1 Construction of IL-2 receptor ⁇ (IL-2R ⁇ ) binding plasmid The plasmid (pcDNA4-IL-2) encoding human IL-2 encoding the mutant protein of the present invention is a Jurkat cell (# TKG 0209 Tohoku) based on the sequence information described in NCBI Reference Sequence: NM_000586.3. Amplified by the PCR method using cDNA (PrimeScript (trade) II 1st strand cDNA Synthesis Kit, Takara Bio Co., Ltd. # 6210A) derived from mRNA derived from mRNA derived from Medical Cell Resource Center, Institute of Aging Medicine, University (Purchased from Medical Cell Resource Center) as a template.
- cDNA PrimarymeScript (trade) II 1st strand cDNA Synthesis Kit, Takara Bio Co., Ltd. # 6210A
- the human IL-2 mutant MK-14 is a PCR method using synthetic primers for the human IL-2 gene contained in the plasmid above (PrimeSTAR TM Max DNA Polymerase, Takara Bio Co., Ltd. # R045A). ) Introduced a new mutation, and a plasmid (PCDNA4-MK-14) encoding the structure was constructed.
- MK-6 and MK-15 encoding the mutant proteins of the present invention are those in which a new mutation is introduced by the PCR method using MK-14 as a template, and a plasmid encoding a structure (pcDNA4-MK-6). And cDNA4-MK-15) were constructed.
- MK-4 was also introduced with a new mutation by the PCR method using MK-14 as a template, and a plasmid encoding the structure (pcDNA4-MK-4) was constructed.
- Production of IL-2 mutant protein The IL-2 mutant protein used in the following examples was prepared as follows using the plasmid obtained by the above method: The polyhistidine-tagged IL-2 variant protein transforms the plasmid encoding the structure into NEB Table chemical competent E. coli cells (NEB® # C3040H) and colonies on Amp-selected agar plates. The transformants were used to inoculate LB cultures. After overnight growth, pelletized E.
- coli cells were used for a large plasmid preparation (NucleoBond® Xtra Maxi EF® Mahalai Nagel # 740424).
- Expression per IL-2 variant protein construct is human embryo-derived kidney (HEK) cells in 250 ml suspension culture grown in Expi293® expression medium (Thermo Fisher Scientific Co., Ltd., # A1435101).
- Expi293F® Thermo Fisher Scientific Co., Ltd., # A14527
- Expi293 cells were grown in a disposable sterile disposable Erlenmeyer flask flat bottom 1000 mL vent filter Thermo Fisher Scientific Co., Ltd. at 37 ° C., 8% CO 2 and 80% humidity.
- the shaking speed was 125 rpm in the Waken Be Tech Co., Ltd. remote shake.
- 11.25 ml of transfection medium (Opti-MEM® I (1x) + GlutaMAX®-I reduced serum medium, Thermo Fisher Scientific Co., Ltd. (registered trademark) # 51985-026) 250 ⁇ g of DNA in Medium and 11.83 ml of Transfection 675 ⁇ l ExpiFectamine® 293 Reagent (ExpiFectamine TM 293 Transfection Kit, Life technologies® # A14525), manufacturer's instructions. Used according to.
- the liquid obtained by purification centrifugation and filtration through a 0.22 ⁇ m filter was prepared using NPI-20 buffer (50 mM NaH 2 PO 4 , 300 mM NaCl, 20 mM imidazole) using an AKTA go chromatography system (GE-Healthcare). It was poured into a 5 ml HisTrap HP column (GE-Healthcare # 17524802, USA) equilibrated at pH 8.0) at a low flow rate, and then the low affinity binding impurities were eluted with NPI-20 buffer.
- NPI-20 buffer 50 mM NaH 2 PO 4 , 300 mM NaCl, 20 mM imidazole
- AKTA go chromatography system GE-Healthcare
- the bound fusion protein elutes with 100% NPI-250 buffer (50 mM NaH 2 PO 4 , 300 mM NaCl, 250 mM imidazole, pH 8.0) and the main peak uses the peak detection option of Unicorn® software. Collected. Purified using 1 ⁇ D-PBS (-) (Gibco®), Prepacked Disposable PD-10 Colors (GE-Healthcare # 17085101, USA). Each fraction of 1 ml was collected and analyzed by reducing SDS-PAGE using SuperCep TM Ace 10-20% 13well® gel (Fuji-Film Wako # 191-15031).
- the sample was mixed with a 3 x SDS (sodium dodecyl sulfate) sample buffer supplemented with 10 x reducing agent. The mixture was heated at 95 ° C. for 5 minutes before filling on SDS-PAGE. Proteins were visualized using QC Colloidal Coomasie staining (BIO-RAD # 1610803) according to the manufacturer's instructions. For protein cleavage by protease, TEV protease (Applied Biological Materials Co., Ltd. # E027) was used. Protein quantification was measured using the Protein Assay BCA Kit (Nacalai Tesque, Inc. # 06385-00) according to the manufacturer's instructions.
- SDS sodium dodecyl sulfate
- 293T cells were obtained from RIKEN Cell Bank (RCB2202).
- the human and mouse IL-2 receptor ⁇ expression 293T (293Ta) is a lentiviral vector constructed using human and mouse IL-2 receptor ⁇ chain genes (NCBI Reference Sequence: NM_000417.2 and NM_0083367.3) as cassettes, respectively. It was established as a cell that stably expresses IL-2 receptor ⁇ in 293T using pSIN-EF-RfA2-1-humanIL-2Ra and pSIN-EF-RfA2-1mouseIL-2Ra).
- NanoLuc TM luciferase sequence was fused with human stable M-type.
- 4-IL-2 MK-4, pcDNA4-MK-4-NLuc, equivalent to comparative example
- mature stable mutant human MK-6-IL-2 MK-6, pcDNA4-MK-6-NLuc
- Mature stable mutant human IL-2 MK-14, pcDNA4-MK-14-NLuc, IL-2 positive control
- mature stable mutant human MK-15-IL-2 MK-15, pcDNA4-MK-15
- FIG. 10 shows mouse and human IL-2 receptor sigma binding.
- MK-6 and MK-15 did not show binding to the IL-2 receptor ⁇ in mice.
- MK-4 has high mouse IL-2 receptor ⁇ binding.
- MK-6 and MK-15 did not show binding to human IL-2 receptor ⁇ .
- MSA-CSPG4-scFv-MK-14 or MSA-CSPG4-scFv-MK-6 was used as the IL-2 sample to be assayed.
- plasmid construction and IL- are the same as in Example 1 except that the DNA encoding the amino acid sequence shown in SEQ ID NO: 20 or 19 is used.
- 2 Obtained by producing a mutant protein.
- the binding property to human and mouse IL-2 receptor ⁇ -expressing 293T cells was also examined as a numerical value of the amount ratio (293Ta / 293T). The results are shown in FIG. As shown in FIG.
- MSA-CSPG4-scFv-MK-14 bound to human and mouse IL-2 receptor ⁇
- MSA-CSPG4-scFv-MK-6 was similar to MK-6 in human and mouse. It can be seen that it does not bind to IL-2 receptor ⁇ .
- binding to human CSPG4 on cells was measured. Specifically, CT26 cells were purchased from the Medical Cell Resources Center, Institute of Aging Medicine, Tohoku University.
- CT26 / CSPG4 Human CSPG4-expressing CT26 cells (CT26 / CSPG4) are Lentiviral vectors (LT3G-hCSPG4-myc-His, Johannes A plasmid in which the human CSPG4 gene cDNA was inserted into pmiRE18_LT3GEPIR_Ren713 distributed from Pathology (IMP) was established as CT26 cells inducibly expressing human CSPG4 in the presence of doxicycline.
- CT26 and CT26 / CSPG4 were 24 wel cell cells.
- Mature stable mutant human MK-6-IL-2 (MK-6, cDNA4) fused to a plate (Techno Plastic Products AG # 92424) and then fused with a NanoLuc TM luciferase sequence (Promega Corporation, USA).
- -MK-6-NLuc mature stable mutant MSA-CSPG4-scFv-MK-6
- pcDNA4-MSA-CSPG4-scFv-MK-6-NLuc mature stable mutant MSA-CSPG4-scFv-MK-6
- MK-6 fused albumin and CSPG-scFv contains albumin and CSPG-scFv. It bound to CSPG4 in the same manner as the fused MK-14. From this result, it can be seen that MK-6 to which the antibody-like molecule is bound binds to the target antigen (human CSPG4) expressed on cancer cells.
- Example 2 IL-2-Dependent Cell Proliferation
- Example 2-1 IL-2-Dependent Cell Proliferation
- CTLL-2 cells RIKEN cell bank RCB0637
- mouse T cell line CTLL-2 cells RIKEN cell bank RCB0637
- the cells proliferate in an IL-2 dependent manner, they are used in rapid and sensitive bioassays for IL-2 detection.
- CTLL-2 cells added with 1 nM human IL-2 (BioLegend # 589106), 50 ⁇ M 2-mercaptoethanol (Gibco®), 10% fetal bovine serum (Fetal Bovine Serum (FBS), Hyclone) PRMI- It was grown at 1640 (FujiFilm-Wako # 1890202), penicillin 100 units / ml, streptomycin 100 units / ml 37 ° C. 5% CO 2 at 37 ° C., 10% CO 2 and 97% humidity.
- CTLL-2 is a factor-dependent cell lineage that requires IL-2 for growth.
- CTLL-2 cells 5% FBS, 5 ⁇ 10 -5 M 2-mercaptoethanol, 50 ⁇ g / ml penicillin, 50 ⁇ g / ml streptomycin, and 3 -Washed twice with high glucose DMEM supplemented with 4.0 mM L-glutamine.
- IL-2 samples to be assayed were titrated with RPMI with 10% FBS in 96-well cell culture plate (Techno Plastic Products AG # 92097). Washed CTLL-2 cells were added (final assay volume 100 ⁇ l, 3000 cells / hole) and plates were incubated for approximately 72 hours at 37 ° C. and 10% CO 2 .
- TPA-Mat cells which are IL-2-dependent T cell lines (distributed by Dr. Toshikazu Takeshita, Shinshu University. J Cell Physiol., 136: 319-25, 1988. ) was used. These cells are medium supplemented with human IL-2 (1 nM human IL-2 (BioLegend # 589106)), 10% fetal bovine serum (FBS, Hyclone) added PRMI-1640 (FujiFilm-Wako # 18902025), penicillin 100 units. In / ml, streptomycin 100 units / ml), the cells were grown at 37 ° C.
- KHYG-1 cells which are IL-2 dependent NK cell lines (distributed by Dr. Toshikazu Takeshita, Shinshu University, express only human IL-2 receptor ⁇ chain and not ⁇ chain) and TPA-Mat ⁇ KO cells (distributed by Dr. Toshikazu Takeshita, Shinshu University, expressing only the human IL-2 receptor ⁇ chain and not the ⁇ chain) were used.
- the IL-2 samples to be assayed include MK-4-IL-2 (MK-4), MK-6-IL-2 (MK-6), MK-14-IL-2 (MK-14), and MK-15.
- -IL-2 (MK-15), HSA-CSPG4-scFv-MK-14 or HSA-CSPG4-scFv-MK-6 was used.
- plasmid construction and IL- are the same as in Example 1 except that the DNA encoding the amino acid sequence represented by SEQ ID NO: 17 or 16 is used.
- IL-2 samples Obtained by producing a mutant protein.
- These IL-2 samples were titrated with RPMI1640 with 10% FBS in 96-well cell culture plate (Techno Plastic Products AG #) and adjusted as each sample of elevated concentration. Washed TPA-Mat, or TPA-Mat ⁇ KO cells or KHYG-1 cells were added (final assay volume 100 ⁇ l, 3000 cells / hole) and plates were incubated for approximately 72 hours at 37 ° C. and 10% CO 2 . For the cells in each hole, the number of cells was quantitatively measured using CellTiter-Glo® Luminescent Cell Viability Assay Kit (Promega # G7570), and the Emax of each IL-2 (including mutants) was 100. % And expressed as a relative value.
- IL-2-dependent proliferation is a numerical value relating to biological activity and refers to a measure of biological activity in a cell-based quantitative in vitro assay.
- MK-6-IL was compared with the 50% effect concentration (EC50) of MK-14-IL-2 and IL-2 (BioLegend # 589106).
- EC50 50% effect concentration
- TPA-Mat the results were similar to those of CTLL-2.
- MK-6 exerted the same maximum proliferative effect as IL-2 and MK-14-IL-2 on mouse and human T cell lines. Furthermore, as shown in FIG. 14, MK-15 showed proliferative activity against CTLL-2 and TPA-Mat, similar to MK-6. Furthermore, MK-6 and MK-15 exerted proliferative activity against TPA-Mat ⁇ KO cells or KHYG-1 cells. MK-6 and MK-15 are human IL-2 receptors because they showed the same proliferative activity as MK-14 against these cells expressing only the IL-2 receptor ⁇ chain and not the ⁇ chain. It can be seen that it has the ability to exert the same level of proliferative activity as IL-2 on ⁇ chain expressing cells.
- Example 2-2 CTLL-2 was used in the same manner as in Example 2-1 except that MK-6-IL-2, HSA-3xG4S-MK-6 or HSA-3x (EAAAK) -MK-6 was used as the IL-2 sample.
- the proliferation test was performed.
- HSA-3xG4S-MK-6 or HSA-3x (EAAAK) -MK-6 are obtained by changing the linker sequence of MK-6-IL-2 to 3xG4S or 3x (EAAAK), respectively, and sequence the amino acid sequence. Shown in number 7 or 9.
- These IL-2 samples were also obtained by performing plasmid construction and IL-2 mutant protein production in the same manner as in Example 1 except that the DNA encoding the amino acid sequence shown in SEQ ID NO: 7 or 9 was used.
- MK-6-IL-2, HSA-3xG4S-MK-6 and HSA-3x (EAAAK) -MK-6 all have the same proliferation activity. showed that.
- TPA-Mat TPA-Mat ⁇ KO cells or KHYG-1 cells
- the results were similar to those of CTLL-2.
- MK-6-IL-2 fused with albumin is equivalent to MK-6-IL-2 for mouse and human T cell lines regardless of whether a flexible linker or a rigid linker is used. Exhibited a proliferative effect.
- Example 2-3 IL-2 dependent as in Example 2-1 except that MK-6-IL-2, HSA-CSPG4-scFv-MK-6 and HSA-CSPG4-scFv-MK-14 are used as IL-2 samples.
- a sex growth test was performed. The results are shown in FIG. As shown in FIG. 16, HSA-CSPG4-scFv-MK-14 showed high proliferative activity against CTLL-2 and TPA-Mat. On the other hand, HSA-CSPG4-scFv-MK-6 showed the same proliferative activity as MK-6-IL-2.
- HSA-CSPG4-scFv-MK-6 exhibited the same proliferative activity as HSA-CSPG4-scFv-MK-14 and MK-6-IL-2 against TPA-Mat ⁇ KO cells or KHYG-1 cells. Since the three cells showed equivalent proliferative activity against these cells expressing only the IL-2 receptor ⁇ chain and not the ⁇ chain, HSA and CSPG4 and MK-6 were ligated via the G4S linker. However, it can be seen that it has the ability to exert the same degree of proliferative activity on human IL-2 receptor ⁇ chain expressing cells.
- Example 3 IL-2 Dependent Treg Cell Proliferation Treg cells (CD4 + CD25 + ) are obtained from the spleen of BALB / c mice (8 weeks old, Nippon SLC Co., Ltd.) from the spleen of CD4 + CD25 + Regulatory T cell Isolation Kit (8 weeks old). Prepared using Miltenyi Biotec # 130-091-041) according to the manufacturer's instructions.
- Treg cells were then washed twice with 1xD-PBS (-) (Gibco®) and then resuspended in 1xD-PBS (-) and CFSE (5,6-carboxyfluorescein dialectate succinidil ester, Staining with BioLegend # 423801) at room temperature and in the dark for 15 minutes.
- CFSE 1,6-carboxyfluorescein dialectate succinidil ester, Staining with BioLegend # 423801
- IL-2 BioLegend # 589106
- MK-14-IL-2 induced cell division and proliferation for more than 70% Treg at a concentration of 1 nM, but by MK-6. Since the cell division-promoting effect of Treg did not change at all with no addition (0 pM), the proliferative activity for Treg was deficient.
- CD8 + T cells CD3 + CD4 --CD8 + :
- Treg cells CD3 + CD4 + CD25 + FoxP3 +
- NK CD3 --CD49b + NKp46 +
- the antibodies used were CD3 ⁇ : 145-2C11, BioLegend Co., Ltd., CD4: RM4-4, BioLegend Co., Ltd., CD8a: 53-6.7, BioLegend Co., Ltd., CD25 (IL-2R ⁇ ): PC61, BioLegend. NKp46: 29A1.4, BioLegend Co., Ltd., FoxP3; FJK-16s, DB Biosciences Co., Ltd.
- Example 5 Side effects of IL-2 in vivo administration IL-2 (MK-6-IL-2 or MK-14-IL-2) to mice (BALB / c, 8 weeks old, Nippon SLC Co., Ltd.) It was administered to the body and its in vivo effect was examined. Specifically, each IL-2 was intravenously administered once a day in an amount of 2.5 ⁇ g, 25 ⁇ g, and 250 ⁇ g for 4 consecutive days. On the 5th day, the mice were euthanized, weighed, and the weight gain ratio compared with that before administration was calculated. In addition, the liver and spleen were removed and their weights were measured.
- IL-2 MK-6-IL-2 or MK-14-IL-2
- Example 6 Antitumor effect of IL-2 monotherapy in CT26 colorectal cancer-bearing model mice IL-2 (MK-14-IL-2 or) for cancer-bearing mice (BALB / c) subcutaneously transplanted with CT26 colorectal cancer cells
- MK-6-IL-2 The effect of MK-6-IL-2 was measured.
- 5x10 5 CT26 cells purchased from the Medical Cell Resource Center, Institute of Aging Medicine, Tohoku University
- mice (BALB /) allogeneic to the cells were suspended. It was subcutaneously transplanted to the back of c).
- the tumor diameter (minor diameter a and major diameter bmm) was measured.
- the tumors increased similarly in the group treated with 1 ⁇ D-PBS (-) and MK-14-IL-2, but in the group treated with MK-6-IL-2, MK-14- Tumor growth was significantly suppressed compared to the IL-2 group.
- Example 7 FACS analysis of intratumoral T cells treated with IL-2 monotherapy in CT26 colorectal cancer model mice.
- 5x10 5 CT26 cells purchased from the Medical Cell Resource Center, Institute of Aging Medicine, Tohoku University
- a 26G needle and 1mL syringe were used.
- BALB / c mice (8 weeks old, Japan SLC Co., Ltd.) were subcutaneously transplanted into the back.
- D-PBS -
- IL-2 MK-14-IL-2 or MK-6-IL-2
- TIL intratumoral lymphocytes
- Treg cells CD4 + CD25 + FoxP3 +
- CD8 + T cells CD8 + T cells
- PD-1 + CD8 + T cells CD4 + T cells
- NK cells CD3 - CD49b + NKp46 +
- the CD8 / Treg ratio is shown as a relative value obtained by dividing the number of CD8 + T cells by the number of Treg cells.
- the antibodies used were CD3 ⁇ : 145-2C11, BioLegend Co., Ltd., CD4: RM4-4, BioLegend Co., Ltd., CD8a: 53-6.7, BioLegend Co., Ltd., CD25 (IL-2R ⁇ ): PC61, BioLegend.
- the Treg (%) in the CD4 + T cell group was significantly lower than that in the group to which MK-14-IL-2 was administered. (Fig. 21d).
- the CD8 / Treg ratio was significantly increased as compared with the PBS-administered group.
- Example 8 Antitumor effect of IL-2 monotherapy in B16F10 malignant melanoma model mouse IL-2 (MK-6-IL-2) for cancer-bearing mouse (C57BL / 6) subcutaneously transplanted with B16F10 malignant melanoma Alternatively, the effect of MK-14-IL-2) was measured. Specifically, 5x10 5 B16-F10 cells (purchased from the Medical Cell Resources Center, Institute of Aging Medicine, Tohoku University) were suspended in 100 ⁇ L of 1xD-PBS (-), and a 26 G needle and 1 mL syringe were placed. It was subcutaneously transplanted to the back of C57 / BL6 mice (8 weeks old, Nippon SLC Co., Ltd.).
- Intraperitoneal administration of 1 ⁇ D-PBS (-), MK-14-IL-2 (5 ⁇ g) or MK-6-IL-2 (100 ⁇ g) twice daily for 5 consecutive days for tumors of uniform size growth. Then, the tumor diameter (minor diameter a and major diameter bmm) was measured over time using a caliper. The tumor volume (V) was calculated using the approximate formula of major axis ⁇ major axis ⁇ minor axis ⁇ 2 (V axb 2/2 ) mm 3 . The results of measuring the tumor system are shown in FIG. As shown in FIG. 22, MK-6 had a significantly smaller tumor volume than 1 ⁇ D-PBS ( ⁇ ) on the 7th day after the start of IL-2 administration.
- Example 9 FACS analysis of intratumoral lymphocytes by IL-2 monotherapy in B16F10 malignant melanoma-bearing cancer model mice
- FACS analysis of intratumoral T cells by IL-2 monotherapy in B16F10 malignant melanoma-bearing cancer model mice went. Specifically, 5x10 5 B16F10 cells (purchased from the Medical Cell Resources Center, Institute of Aging Medicine, Tohoku University) were suspended in 100 ⁇ L of 1xD-PBS (-) and used with a 26G needle and 1mL syringe. , C57 / BL6 mice (8 weeks old, Nippon SLC Co., Ltd.) were subcutaneously transplanted into the back.
- TIL intratumoral lymphocytes
- Dissociation buffer 10% fetal bovine serum (FBS, Hyclone) added PRMI-1640 (FujiFilm-Wako # 1890202) / penicillin 100 units / ml / Streptomycin 100 units / ml, DNaseI (Sigma-Aldrich # DN25-100MG, 50 ⁇ g / mL added) was immersed and shaken at 37 ° C. for 30 minutes at 122 rpm (Titec BR-53FP). Cell suspension was passed through a 70 ⁇ m strainer (BD Falcon).
- TIL blood line cells
- CD8 + T cells CD4 + T cells, Treg cells (CD4 + CD25 + FoxP3 + ), IFN ⁇ + CD8 + T cells (activated CD8 + T cells) NK cells (CD3 - CD49b + NKp46 + ), IFN ⁇ + NK cells
- the number of cells of (activated NK cells), PD-1 + CD8 + T cells and PD-1 + Treg cells (activated Treg cells) was quantified.
- the antibodies used were CD3 ⁇ : 145-2C11, BioLegend Co., Ltd., CD4: RM4-4, BioLegend Co., Ltd., CD8a: 53-6.7, BioLegend Co., Ltd., CD25 (IL-2R ⁇ ): PC61, BioLegend.
- NKp46 29A1.4, BioLegend Co., Ltd., FoxP3; FJK-16s, DB Biosciences Co., Ltd., PD-1: 29F. 1A12, BioLegend, IFN ⁇ : 4SB3, BioLegend (Co., Ltd.).
- the CD8 / Treg ratio is shown as a relative value obtained by dividing the number of CD8 + T cells by the number of Treg cells. The results are shown in FIG. As shown in FIG. 23, there was no significant difference between CD8 + T cells, CD4 + T cells, Treg cells (CD4 + CD25 + FoxP3 + ), and IFN ⁇ + CD8 + T cells (activated CD8 + T cells).
- NK cells CD3 - CD49b + NKp46 +
- IFN ⁇ + NK cells were significantly higher in the MK-6-IL-2 administration group than in the PBS administration group, respectively.
- Example 10 Antitumor effect of mature MK-6-IL-2-mouse albumin (SEQ ID NO: 12) monotherapy in CT26 colorectal cancer model mice Cancer-bearing mice subcutaneously transplanted with CT26 colorectal cancer cells (BALB / c) The effect of MSA-IL-2 (MSA-MK-14-IL-2 (SEQ ID NO: 13) or MSA-MK-6-IL-2 (SEQ ID NO: 12)) was measured. Specifically, 5x10 5 CT26 cells (purchased from the Medical Cell Resource Center, Institute of Aging Medicine, Tohoku University) were suspended in 100 ⁇ L of 1xD-PBS (-), and mice (BALB /) allogeneic to the cells were suspended.
- MSA-IL-2 MSA-MK-14-IL-2
- MSA-MK-6-IL-2 SEQ ID NO: 12
- the tumor to which 1 ⁇ D-PBS (-) was administered increased with time, but the group to which MSA-MK-14-IL-2 was administered did not have a significant difference in the tumor shrinkage effect. rice field.
- the group to which MSA-MK-6-IL-2 was administered tumor growth was significantly suppressed as compared with the PBS and MSA-MK-14-IL-2 groups.
- Example 11 FACS analysis of intratumoral T cells by monotherapy with mature MK-6-IL-2-mouse albumin (SEQ ID NO: 12) in CT26 colorectal cancer-bearing model mice Intratumor T cells treated with IL-2 monotherapy in CT26 colorectal cancer-bearing model mice were prepared and FACS analysis was performed. Specifically, 5x10 5 CT26 cells (purchased from the Medical Cell Resource Center, Institute of Aging Medicine, Tohoku University) were suspended in 100 ⁇ L of 1xD-PBS (-), and a 26G needle and 1mL syringe were used. BALB / c mice (8 weeks old, Japan SLC Co., Ltd.) were subcutaneously transplanted into the back.
- IL-2 For tumors grown to uniform size, IL-2 (MSA-MK-14-IL-2 or MSA-MK-6-IL-2) fused with 1xD-PBS (-) or albumin was given on day 5 and Intratumoral lymphocytes (TIL) were adjusted from the tumor excised on the 12th day by intraperitoneal administration twice in total on the 10th day. Specifically, the excised tumor is fragmented with scissors or the like, and then 10 mL of Dissociation buffer (10% fetal bovine serum (FBS, Hyclone) added PRMI-1640 (FujiFilm-Wako 18902025) / penicillin 100 units / ml / streptomycin).
- Dissociation buffer 10% fetal bovine serum (FBS, Hyclone) added PRMI-1640 (FujiFilm-Wako 18902025) / penicillin 100 units / ml / streptomycin).
- Treg cells (CD4 + CD25 + FoxP3 + ), CD8 + T cells, PD-1 + CD8 + T cells, CD4 + T cells, NK cells (CD3 - CD49b + NKp46). + ) was analyzed by FACS and the number of each cell was quantified.
- the CD8 / Treg ratio is a relative value obtained by dividing the number of CD8 + T cells by the number of Treg cells.
- the antibody used was CD3 ⁇ : 145-2C11, BioLegend Co., Ltd., CD4: RM4-4, BioLegend Co., Ltd., CD8a: 53-6.7, BioLegend Co., Ltd., CD25 (IL-2R ⁇ ): PC61, BioLegend Co., Ltd., NKp46: 29A1.4, BioLegend Co., Ltd., FoxP3; FJK-16s, DB Biosciences Co., Ltd., PD-1: 29F.1A12, BioLegend.
- FIG. 24b mature MK-6-IL-2.
- the proportion of the CD3 + T cell group was significantly higher than that in the group administered with mature MK-14-IL-2-mouse albumin (SEQ ID NO: 13).
- the Treg (%) in the CD4 + T cell group was significantly lower (Fig. 24b).
- the CD8 / Treg ratio was significantly increased as compared with the PBS-administered group and the mature MK-14-IL-2-mouse albumin-administered group.
- Example 12 Changes in IL-2 blood concentration after intraperitoneal administration of mature MK-6-IL-2 (SEQ ID NO: 3) and mature MK-6-IL-2-mouse albumin (SEQ ID NO: 12) (a) And quantification of intratumoral IL-2 in CT26 colorectal cancer-bearing model mice (a) BALB / c mice (8-week-old, MK-6 (SEQ ID NO: 3), which corresponds to an equal amount of mol with respect to Nippon SLC Co., Ltd.) 25 mg), MSA-MK-6 (SEQ ID NO: 12) (65 mg) were administered intraperitoneally. Each IL-2 was fused with a NanoLuc TM luciferase sequence (Promega Corporation, USA), after administration.
- Blood IL-2 was quantified by NanoLuc TM activity.
- Half-life in beta phase ( ⁇ phase) starting 1 hour after administration (Mean ⁇ help-lives (t 1/2 )) ⁇ SD (Standard deviation) was measured.
- % Residual rate (% Remaining) is a relative value (%) obtained by dividing each NanoLuc activity measurement value 1 hour after administration by the NanoLuc activity measurement value at each time point.
- ⁇ phase and Refers to the phase that rapidly decays in the early stage ( ⁇ phase) and then the phase that slowly decays ( ⁇ phase) in the subsequent transition of blood concentration, and the half-life is calculated in this phase. The result is 24a. As shown in FIG.
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Abstract
Description
本出願は、2020年9月18日に出願された、日本国特許出願2020-157900号明細書(その開示全体が参照により本明細書中に援用される)に基づく優先権を主張する。本発明は、IL-2変異体タンパク質及びこれを含む医薬に関する。
項1.配列番号3で表されるアミノ酸配列又は配列番号3のアミノ酸配列に対して少なくとも95%の配列同一性を有し、かつ35位、38位、42位又は43位、及び45位のアミノ酸が全てAであるアミノ酸配列を有するIL-2変異体タンパク質。
本発明は、配列番号3で表されるアミノ酸配列又は配列番号3のアミノ酸配列に対して少なくとも95%の配列同一性を有し、かつ35位、38位、42位又は43位及び45位のアミノ酸が全てAであるアミノ酸配列を有するIL-2変異体タンパク質を提供する。従って、本発明は、配列番号3で表されるアミノ酸配列;配列番号3のアミノ酸配列に対して少なくとも95%の配列同一性を有し、かつ35位、38位、42位及び45位のアミノ酸が全てAであるアミノ酸配列;又は配列番号3のアミノ酸配列に対して少なくとも95%の配列同一性を有し、かつ35位、38位、43位及び45位のアミノ酸が全てAであるアミノ酸配列を有するIL-2変異体タンパク質を提供する。配列番号3のアミノ酸配列に対して少なくとも95%の配列同一性を有し、かつ35位、38位、42位及び45位のアミノ酸が全てAであるアミノ酸配列としては、例えば、配列番号4で表されるアミノ酸配列が挙げられる。
図9(下)は、IL-2/IL-2受容体αβγ複合体とIL-2の結合に関する立体構造模式図である。図9(下)における各タンパク質の立体構造模式図は、蛋白質構造データバンク(PDB:Protein Data Bank)の公知データ(2ERJ)を用いて作出した。
別の実施形態において、本発明は、上記IL-2変異体タンパク質を含む医薬を提供する。前述したIL-2変異体タンパク質が奏する効果から、本発明は、IL-2受容体αに対する結合が減弱するIL-2を改変した医薬、IL-2受容体βおよびγからなる受容体に対する結合が増加するIL-2を改変した医薬を提供することができる。また、本発明の医薬は、例えば、癌を予防及び/又は治療するために用いることができる。
プラスミドの構築:
本発明の変異体タンパク質をコードするヒトIL-2をコードするプラスミド(pcDNA4-IL-2)は、NCBI Reference Sequence: NM_000586.3に記載された配列情報をもとにJurkat細胞(#TKG 0209東北大学加齢医学研究所医用細胞資源センターより購入)に由来するmRNAに由来するcDNA(PrimeScript(商標) II 1st strand cDNA Synthesis Kit、タカラバイオ(株)#6210A)を鋳型としてPCR法により増幅し、哺乳類細胞用発現ベクター(pcDNA(商標)4/myc-HisA Mammalian Expression Vector、Thermo Fisher Scientific(株))に対して、所望の融合体をコードするDNAをもたらすのに採用される基本ステップとして、In-fusion反応(タカラバイオ(株)In-fusion HD Cloning Kit#639648)を用いて包含させた。精製のため、IL-2遺伝子のC末にプロテアーゼ切断配列(TEV切断アミノ酸配列ENLYFQG)とStrep-tag(登録商標)Strep tag及びポリヒスチンタグを融合させた。ヒトIL-2変異体MK-14は、上記でプラスミドに包含されたヒトIL-2遺伝子に対して、合成プライマーを用いたPCR法(PrimeSTAR(商標)Max DNA Polymerase、タカラバイオ(株)# R045A)により新たな変異を導入したものであり、構造物をコードするプラスミド(pcDNA4-MK-14)を構築した。本発明の変異体タンパク質をコードするMK-6及びMK-15は、MK-14を鋳型として、PCR法により新たな変異を導入したものであり、構造物をコードするプラスミド(pcDNA4-MK-6及びpcDNA4-MK-15)を構築した。また、MK-4も、MK-14を鋳型として、PCR法により新たな変異を導入したものであり、構造物をコードするプラスミド(pcDNA4-MK-4)を構築した。
IL-2変異体タンパク質の製造:
以降の実施例で用いるIL-2変異体タンパク質は、上記方法で得られたプラスミドを用い、以下のように製造した:
ポリヒスチジンタグ付きIL-2変異体タンパク質は構造物をコードしているプラスミドをNEB社Stable化学的コンピテント大腸菌細胞(NEB(登録商標)#C3040H)に形質転換し、コロニーはAmp選択寒天プレート上で増殖させ、形質転換体はLB培養物に播種するのに使用した。一晩増殖後、ペレット状の大腸菌細胞は大規模プラスミド調製物(NucleoBond(登録商標)Xtra Maxi EF(登録商標)マハライ・ナーゲル社#740424)のために使用した。
IL-2変異体タンパク質構築物ごとの発現は、Expi293(登録商標)発現培地(Thermo Fisher Scientific(株)、#A1435101)において増殖させた250mlの懸濁培養物でのヒト胎児由来腎臓(HEK)細胞(Expi293F(登録商標)、Thermo Fisher Scientific(株)、#A14527)へのプラスミドの一過性トランスフェクションによって決定した。Expi293細胞は、37℃、8%CO2および80%湿度で使い捨て滅菌ディスポーザブル三角フラスコ平底1000mLベントフィルターThermo Fisher Scientific(株))において増殖させた。振盪速度はワケンビーテック(株)リモートシェイクにおいて125rpmであった。トランスフェクションごとに、11.25mlのトランスフェクション培地(Opti-MEM(登録商標)I(1x)+GlutaMAX(登録商標)-I減少血清培地、Thermo Fisher Scientific(株)(登録商標)#51985-026)中250μgのDNA及び11.83mlのトランスフェクション培中の675μlのExpiFectamine(登録商標)293試薬(ExpiFectamine(商標)293トランスフェクションキット、Life technologies(登録商標)#A14525)を、製造業者の使用説明書に従って使用した。トランスフェクション22時間後、培養物に1.25mlのエンハンサー1及び12.5mlのエンハンサー2(ExpiFectamine(登録商標)293トランスフェクションキット、Thermo Fisher Scientific(株)#A14525)を与えた。トランスフェクションのおおよそ120時間後、細胞培養物は30分間、4000gの遠心分離により収穫し、浄化した培地は精製する前に0.22μmラピッドフィルターMaxセット(ボトルトップ&ボトル)500ml(Techno Plastic Products AG社#99500、Switzerland)を通じた濾過を行った。フィルターを通して無菌濾過しタンパク質発現の精製のために使用した。以降の実施例において用いたMK―6のアミノ酸配列は配列番号3に、MK―15のアミノ酸配列を配列番号4に、MK―4のアミノ酸配列は配列番号5に示す。
遠心分離及び0.22μmフィルターを通じた濾過を行った液は、AKTA goクロマトグラフィーシステム(GE-Healthcare社)を使用して、NPI-20バッファー(50mM NaH2PO4、300mM NaCl、20mMイミダゾール、pH8.0)で平衡化した5mlのHisTrap HPカラム(GE-Healthcare社#17524802、米国)に低流速で注ぎ、その後低親和性結合不純物はNPI-20バッファーで溶出させた。結合している融合タンパク質は100%NPI-250バッファー(50mM NaH2PO4、300mM NaCl、250mMイミダゾール、pH8.0)で溶出し、主ピークはUnicorn(登録商標)ソフトウェアのピーク検出オプションを使用して収集した。1×D-PBS(-)(Gibco(登録商標))中、Prepacked Disposable PD-10 Columns(GE-Healthcare社#17085101、米国)を更に使用して精製した。1mlの各画分を収集し、スーパーセップTMエース10~20%13well(登録商標)ゲル(Fuji-Film Wako社#191-15031)を使用する還元性SDS-PAGEにより分析した。試料を10×還元剤を補充した3×SDS(ドデシル硫酸ナトリウム)試料バッファーと混合した。混合物は、SDS-PAGEに充填する前に95℃で5分間加熱した。タンパク質はQC Colloidal Coomassie染色(BIO-RAD社#1610803)を製造業者の使用説明書に従って使用して可視化した。プロテアーゼによるタンパク質の切断は、TEVプロテアーゼ(Applied Biological Materials(株)#E027)を用いた。タンパク質の定量は、プロテインアッセイBCAキット(ナカライ(株)#06385-00)を用いて、製造業者の使用説明書に従って測定した。
次に細胞上のヒトCSPG4に対する結合(on-cell receptor binding)を測定した。具体的には、CT26細胞は東北大学加齢医学研究所医用細胞資源センターより購入した。ヒトCSPG4発現CT26細胞(CT26/CSPG4)は、ヒトCSPG4鎖遺伝子(NCBI Reference Sequence:NM_001897.5)をカセットとして構築したレンチウイルスベクター(LT3G-hCSPG4-myc-His, Johanness Zuber博士(Research Institute of Molecular Pathology (IMP)より分与されたpmiRE18_LT3GEPIR_Ren713にヒトCSPG4遺伝子cDNAを挿入したプラスミド)を用いてドキシサイクリン存在下にヒトCSPG4を誘導性発現するCT26細胞として樹立した。CT26およびCT26/CSPG4を24 wel cell culture plate(Techno Plastic Products AG社#92424)に付着させたのち、NanoLuc(商標)ルシフェラーゼ配列(Promega Corporation、USA)を融合させた成熟安定型変異ヒトMK-6-IL-2(MK-6、pcDNA4-MK-6-NLuc)、成熟安定型変異MSA-CSPG4-scFv-MK-6(pcDNA4-MSA-CSPG4-scFv-MK-6-NLuc)、成熟安定型変異MSA-CSPG4-scFv-MK-6(pcDNA4-MSA-CSPG4-scFv-MK-6-NLuc)の懸濁液(10nM)を添加し、4℃1時間静置して反応させ、細胞を洗浄後に定量した。 各変異IL-2のヒトCSPG4に対する結合性は、NanoLuc活性の数値として示している。結果を図12に示す。図12に示すように、アルブミンおよびCSPG-scFvを融合させたMK-6は、アルブミンおよびCSPG-scFvを融合させたMK-14と同様にCSPG4に結合した。この結果から、抗体様分子を結合させたMK-6が癌細胞上に発現する標的抗原(ヒトCSPG4)に結合することが分かる。
実施例2-1IL-2依存性細胞増殖
IL-2による培養細胞の増殖は、マウスT細胞株CTLL-2細胞であるCTLL-2細胞(RIKEN細胞バンクRCB0637)を用いた。この細胞は、IL-2依存性に増殖するため、IL-2検出を目的とした迅速および感度の良いバイオアッセイに用いられる。CTLL-2細胞を,1nM ヒトIL-2(BioLegend社#589106)、50μM 2-メルカプトエタノール(Gibco(登録商標))、10%ウシ胎仔血清(Fetal Bovine Serum(FBS),Hyclone社)添加PRMI-1640(FujiFilm-Wako社#18902025)、ペニシリン100units/ml、ストレプトマイシン100units/ml 37℃ 5%CO2で37℃,10%CO2および湿度97%で成長させた。CTLL-2は成長にIL-2を必要とする因子依存性の細胞系列である。従って,アッセイを行うためには,IL-2を除去するためにCTLL-2細胞を,5%FBS、5×10-5M 2-メルカプトエタノール,50μg/mlペニシリン,50μg/mlストレプトマイシン,および3-4.0mM L-グルタミンを補った高グルコースDMEMで2回洗浄した。アッセイするIL-2サンプルは96 wel cell culture plate(Techno Plastic Products AG社#92097)の中において10%FBS添加RPMIで滴定した。洗浄したCTLL-2細胞を加え(最終アッセイ体積は100μl,3000細胞/穴),プレートを約72時間,37℃および10%CO2でインキュベートした。IL-2によるヒトT培養細胞の増殖は、IL-2依存性T細胞株であるTPA-Mat細胞(信州大学・竹下敏一博士より分与。J Cell Physiol.,136:319-25,1988)を用いて実施した。この細胞はヒトIL-2を添加した培地(1nM ヒトIL-2(BioLegend社#589106)、10%ウシ胎仔血清(FBS,Hyclone社)添加PRMI-1640(FujiFilm-Wako社#18902025)、ペニシリン 100units/ml、ストレプトマイシン100 units/ml)中で、37℃ 5%CO2で37℃,10%CO2および湿度97%で成長させた。さらに、IL-2によるヒトT培養細胞の増殖試験のために、IL-2受容体βγ鎖のみを発現しα鎖を発現しない細胞も用いた。具体的には、IL-2依存性NK細胞株であるKHYG-1細胞(信州大学・竹下敏一博士より分与、ヒトIL-2受容体βγ鎖のみを発現しα鎖を発現しない)およびTPA-Mat αKO細胞(信州大学・竹下敏一博士より分与。ヒトIL-2受容体βγ鎖のみを発現し、α鎖を発現しない)を用いた。これらの細胞を、2度洗浄したのち、アッセイするIL-2サンプルに添加した。アッセイするIL-2サンプルとしてはMK-4-IL-2(MK-4)、MK-6-IL-2(MK-6)、MK-14-IL-2(MK-14)、MK-15-IL-2(MK-15)、HSA-CSPG4-scFv-MK-14またはHSA-CSPG4-scFv-MK-6を用いた。HSA-CSPG4-scFv-MK-14またはHSA-CSPG4-scFv-MK-6は、配列番号17又は16で示すアミノ酸配列をコードするDNAを用いる以外、実施例1と同様にしてプラスミド構築及びIL-2変異体タンパク質の製造を行うことにより得られた。これらのIL-2サンプルは、96 wel cell culture plate(Techno Plastic Products AG社#)の中で10%FBS添加RPMI1640を用いて滴定し上昇濃度の各サンプルとして調整した。洗浄したTPA-Mat、またはTPA-Mat αKO細胞またはKHYG-1細胞を加え(最終アッセイ体積 は100μl,3000細胞/穴),プレートを約72時間,37℃および10%CO2でインキュベートした。各穴の細胞は、CellTiter-Glo(登録商標)Luminescent Cell Viability Assay Kit(Promega社#G7570)を用いて細胞数を定量的に測定し、各IL-2(変異体含む)それぞれのEmaxを100%とし、相対値で現した。IL-2、MK-6及びMK-14についての結果を図13に示す。MK-6、MK-4、MK-14、及びMK-15についての結果を図14に示す。IL-2依存性増殖とは、生物活性に関する数値であり、細胞ベースの定量的in vitroアッセイにおける生物学的活性の測定値を指す。図13に示すように、CTLL-2を用いた増殖試験において、MK-14-IL-2およびIL-2(BioLegend社#589106)の50%効果濃度(EC50)に比べてMK-6-IL-2のEC50(50%効果濃度)は、それぞれ低下した。同様にTPA-Matを用いた解析においても、CTLL-2と同様の結果であった。以上から、MK-6はマウスおよびヒトT細胞株に対して、IL-2およびMK-14―IL-2と同等の最大増殖効果を発揮した。さらに、図14に示すように、MK-15はMK-6と同様にCTLL-2およびTPA-Matに対する増殖活性を示した。さらに、MK-6およびMK-15はTPA-Mat αKO細胞またはKHYG-1細胞に対して増殖活性を発揮した。IL-2受容体βγ鎖のみを発現しα鎖を発現しないこれらの細胞に対してMK-14と同等の増殖活性を示したことから、MK-6及びMK-15はヒトIL-2受容体βγ鎖発現細胞に対してIL-2と同程度の増殖活性を発揮する能力を有することが分かる。
IL-2サンプルとしてMK-6-IL-2、HSA-3xG4S-MK-6又はHSA-3x(EAAAK)-MK-6を用いる以外、実施例2-1と同様にして、CTLL-2を用いた増殖試験を行った。HSA-3xG4S-MK-6又はHSA-3x(EAAAK)-MK-6は、MK-6-IL-2のリンカー配列をそれぞれ、3xG4S又は3x(EAAAK)に変えたものであり、アミノ酸配列を配列番号7又は9に示す。これらのIL-2サンプルも配列番号7又は9に示すアミノ酸配列をコードするDNAを用いる以外、実施例1と同様にしてプラスミド構築及びIL-2変異体タンパク質の製造を行うことにより得られた。
図15に示すように、CTLL-2を用いた増殖試験において、MK-6-IL-2とHSA-3xG4S-MK-6およびHSA-3x(EAAAK)-MK-6は、すべて同等の増殖活性を示した。同様にTPA-Mat、TPA-Mat αKO細胞またはKHYG-1細胞を用いた解析においても、CTLL-2と同様の結果であった。以上から、アルブミンを融合させたMK-6ーIL-2は、flexible リンカーを用いてもrigidリンカーを用いても、マウスおよびヒトT細胞株に対して、MK-6―IL-2と同等の増殖効果を発揮した。
IL-2サンプルとしてMK-6-IL-2、HSA-CSPG4-scFv-MK-6およびHSA-CSPG4-scFv-MK-14を用いる以外、実施例2-1と同様にして、IL-2依存性増殖試験を行った。結果を図16に示す。図16に示すように、CTLL-2およびTPA-Matに対する増殖活性は、HSA-CSPG4-scFv-MK-14は高い増殖活性を示した。一方、HSA-CSPG4-scFv-MK-6はMK-6-IL-2と同等の増殖活性を示した。TPA-Mat αKO細胞またはKHYG-1細胞に対してHSA-CSPG4-scFv-MK-6はHSA-CSPG4-scFv-MK-14およびMK-6-IL-2と同等の増殖活性を発揮した。IL-2受容体βγ鎖のみを発現しα鎖を発現しないこれらの細胞に対して3者が同等の増殖活性を示したことから、G4Sリンカーを介してHSAおよびCSPG4とMK-6を連結しても、ヒトIL-2受容体βγ鎖発現細胞に対して同程度の増殖活性を発揮する能力を有することが分かる。
Treg細胞(CD4+CD25+)は、BALB/cマウス(8週令、日本エスエルシー(株))の脾臓からCD4+CD25+Regulatory T cell Isolation Kit(Miltenyi Biotec社#130-091-041)を用いて製造業者の使用説明書に従って調製した。次にTreg細胞を1×D-PBS(-)(Gibco(登録商標))で2回洗浄したのち1×D-PBS(-)に再懸濁し、CFSE(5,6-carboxyfluorescein diacetate succinimidyl ester、BioLegend社#423801)を用いて室温かつ暗所において15分間染色した。10%ウシ胎仔血清(FBS,Hyclone社)添加PRMI-1640(FujiFilm-Wako社18902025)/50μM 2-メルカプトエタノール(Gibco(登録商標))/ペニシリン100units/ml/ストレプトマイシン100units/ml添加)を添加し反応を止め、再度10%ウシ胎仔血清(FBS,Hyclone社)添加PRMI-1640液に懸濁した。あらかじめ、抗CD3モノクローナル抗体(1μg/mL、BioLegend社Purified anti-mouse CD3ε Antibody#100301)を添加した1×D-PBS(-)(Gibco(登録商標))で4℃16時間コーティングし、1×D-PBS(-)(Gibco(登録商標))で3回洗浄した96wel cell culture plate(Techno Plastic Products AG社#92097)を用いて、1穴あたり100,000個のTreg細胞、抗CD28抗体Purified anti-human CD28 Antibody(BioLegend社#102112)、および昇濃度に滴定した、IL-2およびMK-14―IL-2を加え、37℃ 5%CO2湿度97%で細胞を培養した。72時間後に細胞を回収し、フローサイトメトリー(FACS)にてCSFE染色性を定量的に解析した。結果を図17に示す。細胞増殖は、細胞分裂回数に依存して低下するCSFE染色性によって示される。図17に示すように、IL-2(BioLegend社#589106)およびMK-14-IL-2は1nMの濃度において70%超のTregに対して細胞分裂および増殖を誘導したが、MK-6によるTregの細胞分裂亢進作用は無添加(0pM)と何ら変化しなかったことから、Tregに対する増殖活性が欠損していた。
IL-2(MK―6-IL-2またはMK―14-IL-2)を投与したマウス(BALB/c)における末梢免疫系細胞数に対する効果を測定した。具体的には、日本エスエルシー(株)から購入したBALB/cマウス(8週令、n=3)1個体あたり2.5μg,25μg,250μg各量のIL-2を1日1回連続4日間静脈内投与し、最終投与翌日にマウス脾臓から末梢血免疫系細胞を調製した。CD8+T細胞(CD3+CD4-CD8+:)、Treg細胞(CD3+CD4+CD25+FoxP3+)、NK(CD3-CD49b+NKp46+)を抗体で染色し、FACS解析により細胞数を定量した。使用した抗体は、CD3ε:145-2C11,BioLegend(株)、CD4:RM4-4,BioLegend(株)、CD8a:53-6.7,BioLegend(株),CD25(IL-2Rα):PC61,BioLegend(株),NKp46:29A1.4,BioLegend(株),FoxP3;FJK-16s,DB Biosciences(株)である。結果を図18に示す。図18に示すように、MK-14-IL-2およびMK-6とも腫瘍内CD8+T細胞およびNK細胞に対する増加能はなかった。一方で、Treg細胞については、MK-14-IL-2は25μg投与により増加させたが、MK-6は250μg投与においても増加せしめなかった。さらに、CD8/Treg ratioはMK-14-IL-2ではPBS投与群と比べて増加しなかったが、MK-6投与では250μg投与において、MK-14-IL-2と比較して有意に増加させた。
IL-2(MK―6-IL-2またはMK―14-IL-2)をマウス(BALB/c、8週令、日本エスエルシー(株))に対し投与し生体内作用を検討した。具体的には、それぞれのIL-2を、2.5μg,25μg,250μgの各量で、1日1回連続4日間静脈内投与した。5日目にマウスを安楽死させ、体重測定を行い、投与前と比較した体重増加比を計算した。また、肝臓および脾臓を摘出し、それぞれの重量を測定した。肺については、摘出後に重量測定を行い、次いでmiVac(Genevac、SP Scientific社)を用いて乾燥させ乾燥重量を測定し、後者を前者で除することでWater Content(含水量)を計算した。IL-2投与の副作用は、体重および各臓器の重量増加として示される。結果を図19に示す。具体的には、MK-14-IL-2は25μg投与で体重が有意に増加したが、MK-6は250μg投与においても体重増加がなかった。脾臓および肝臓は、いずれも25μgのMK-14-IL-2によって臓器重量が有意に増加したが、MK-6には同様の作用は現れなかった。肺水腫の発生は、肺重量を乾燥重量で除した値(乾燥重量あたりの水分値)で示す。MK-14-IL-2は250μg投与によって肺水腫が発生したが、MK-6投与では同容量の投与による肺水腫の発生はなかった。
CT26大腸癌細胞を皮下移植した担癌マウス(BALB/c)に対するIL-2(MK―14-IL-2またはMK―6-IL-2)の効果を測定した。具体的には、5x105個のCT26細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、細胞と同種であるマウス(BALB/c)の背部に皮下移植した。1×D-PBS(-)、MK―14-IL-2(5μg)またはMK―6-IL-2(100μg)を1日2回5日間連続で腹腔内投与し、経時的にノギスを用いて腫瘍径(短径aおよび長径bmm)を計測した。腫瘍体積(V)は、長径×長径×短径÷2(V=axb2/2)mm3という近似式を用いて計算した腫瘍系を計測した結果を図20に示す。図20に示すように、1×D-PBS(-)およびMK-14-IL-2を投与した群は腫瘍が同様に増大したが、MK―6-IL-2投与群ではMK-14-IL-2群に比べて有意に腫瘍増殖が抑制された。
CT26大腸癌担癌モデルマウスにおけるIL-2単剤治療による腫瘍内T細胞を調整し、FACS解析を行った。具体的には、5x105個のCT26細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、26G針および1mLシリンジを用いて、BALB/cマウス(8週令、日本エスエルシー(株))の背部に皮下移植した。均一サイズ成長した腫瘍に対し、1×D-PBS(-)またはIL-2(MK―14-IL-2またはMK―6-IL-2)を1日2回5日間連続で腹腔内投与した後に、摘出した腫瘍から腫瘍内リンパ球(TIL)を調整した。具体的には、摘出した腫瘍をハサミ等で小片化したのち10mLのDissociationバッファー(10%ウシ胎仔血清(FBS,Hyclone社)添加PRMI-1640(FujiFilm-Wako社18902025)/ペニシリン100units/ml/ストレプトマイシン100units/ml、DNaseI(Sigma-Aldrich#DN25-100MG,50μg/mL添加)に浸し37℃、30分間 122rpmで振盪した(タイテック社BR-53FP)。細胞浮遊液は70μmストレーナー(BD Falcon)を通してシングル細胞化した後、TIL(CD45)MicroBeads,マウス(Miltenyi社#130-110-618)を用いて、MACS Pro Separator(Miltenyi社)により、血液系細胞(CD45+)細胞をTILとして調整した。
調整したTILをFACS解析した結果を図21に示す。Treg細胞(CD4+CD25+FoxP3+)、CD8+T細胞、PD-1+CD8+T細胞、CD4+T細胞、NK細胞(CD3-CD49b+NKp46+)をFACSで解析し、それぞれの細胞数を定量した。CD8/Treg比は、CD8+T細胞数をTreg細胞数で除した相対値で示す。使用した抗体は、CD3ε:145-2C11,BioLegend(株)、CD4:RM4-4,BioLegend(株)、CD8a:53-6.7,BioLegend(株),CD25(IL-2Rα):PC61,BioLegend(株),NKp46:29A1.4,BioLegend(株),FoxP3;FJK-16s,DB Biosciences(株)、PD-1:29F.1A12,BioLegendである。図21に示すように、MK―6-IL-2を投与したマウス由来のTILでは、MK―14-IL-2を投与した群に比べてCD4+T細胞群におけるTreg(%)が有意に少なかった(図21d)。さらに、PBS投与群に比べてCD8/Treg比が有意に上昇した。一方、同腫瘍モデルでは、CD4+T細胞、CD8+T細胞、PD-1+CD8+T細胞およびNK細胞に差異は認めなかった。
B16F10悪性黒色腫を皮下移植した担癌マウス(C57BL/6)に対するIL-2(MK―6-IL-2またはMK―14-IL-2)の効果を測定した。具体的には、5x105個のB16-F10細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、26Gの針および1mLシリンジを用いて、C57/BL6マウス(8週令、日本エスエルシー(株)))の背部に皮下移植した。均一サイズ成長した腫瘍に対し、1×D-PBS(-)、MK-14-IL-2(5μg)またはMK-6-IL-2(100μg)を1日2回5日間連続で腹腔内投与し、経時的にノギスを用いて腫瘍径(短径aおよび長径bmm)を計測した。腫瘍体積(V)は、長径×長径×短径÷2(V=axb2/2)mm3という近似式を用いて計算した。腫瘍系を計測した結果を図22に示す。図22に示すように、MK-6はIL-2投与開始後第7日目において、1×D-PBS(-)に比べて有意に腫瘍体積が小さかった。
B16F10悪性黒色腫担癌モデルマウスにおけるIL-2単剤治療による腫瘍内T細胞のFACS解析を行った。具体的には、5x105個のB16F10細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、26Gの針および1mLシリンジを用いて、C57/BL6マウス(8週令、日本エスエルシー(株)))の背部に皮下移植した。均一サイズ成長した腫瘍に対し、1×D-PBS(-)、MK―14-IL-2(5μg)またはMK―6-IL-2(100μg)を1日2回5日間連続で腹腔内投与した後に、摘出した腫瘍から腫瘍内リンパ球(TIL)を調整した。具体的には、摘出した腫瘍をハサミ等で小片化したのち10mLのDissociationバッファー(10%ウシ胎仔血清(FBS,Hyclone社)添加PRMI-1640(FujiFilm-Wako社 #18902025)/ペニシリン100units/ml/ストレプトマイシン100units/ml、DNaseI(Sigma-Aldrich#DN25-100MG,50μg/mL添加)に浸し37℃、30分間122rpmで振盪した(タイテック社BR-53FP)。細胞浮遊液は70μmストレーナー(BD Falcon)を通してシングル細胞化した後、TIL(CD45)MicroBeads,マウス(Miltenyi社#130-110-618)を用いて、MACS Pro Separator(Miltenyi社)により、血液系細胞(CD45+)細胞をTILとして調整した。
調整したTILをFACS解析した結果を摘出した腫瘍内リンパ球(TIL)のFACS解析を行った。CD8+T細胞、CD4+T細胞、Treg細胞(CD4+CD25+FoxP3+)、IFNγ+CD8+T細胞(活性化CD8+T細胞)NK細胞(CD3-CD49b+NKp46+)、IFNγ+NK細胞(活性化NK細胞)、PD-1+CD8+T細胞およびPD-1+Treg細胞(活性化Treg細胞)について、それぞれの細胞数を定量した。使用した抗体は、CD3ε:145-2C11,BioLegend(株)、CD4:RM4-4,BioLegend(株)、CD8a:53-6.7,BioLegend(株),CD25(IL-2Rα):PC61,BioLegend(株),NKp46:29A1.4,BioLegend(株),FoxP3;FJK-16s,DB Biosciences(株)、PD-1:29F.1A12,BioLegend、IFNγ:4SB3,BioLegend((株))である。CD8/Treg比は、CD8+T細胞数をTreg細胞数で除した相対値で示す。結果を図23に示す。図23に示すように、CD8+T細胞、CD4+T細胞、Treg細胞(CD4+CD25+FoxP3+)、IFNγ+CD8+T細胞(活性化CD8+T細胞)には有意差がなかったが、NK細胞(CD3-CD49b+NKp46+)およびIFNγ+NK細胞は、それぞれPBS投与群よりMK―6-IL-2投与群において有意に多かった。
CT26大腸癌細胞を皮下移植した担癌マウス(BALB/c)に対するMSA-IL-2(MSA-MK―14-IL-2(配列番号13)またはMSA-MK―6-IL-2(配列番号12))の効果を測定した。具体的には、5x105個のCT26細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、細胞と同種であるマウス(BALB/c)の背部に皮下移植した。1×D-PBS(-)、MSA-MK―14-IL-2(5μg)またはMSA-MK―6-IL-2(100μg)を第5日および第10日に計2回腹腔内投与し、経時的にノギスを用いて腫瘍径(短径aおよび長径bmm)を計測した。腫瘍体積(V)は、長径×長径×短径÷2(V=axb2/2)mm3という近似式を用いて計算した腫瘍系を計測した結果を図24aに示す。図24aに示すように、1×D-PBS(-)を投与した腫瘍は経時的に増大したが、MSA-MK-14-IL-2を投与した群は腫瘍の縮小効果に有意差がなかった。一方、MSA-MK―6-IL-2を投与した群は、PBS及びMSA-MK-14-IL-2群に比べて、いずれも有意に腫瘍増殖が抑制された。
CT26大腸癌担癌モデルマウスにおけるIL-2単剤治療による腫瘍内T細胞を調整し、FACS解析を行った。具体的には、5x105個のCT26細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、26G針および1mLシリンジを用いて、BALB/cマウス(8週令、日本エスエルシー(株))の背部に皮下移植した。均一サイズ成長した腫瘍に対し、1×D-PBS(-)またはアルブミンを融合したIL-2(MSA-MK―14-IL-2またはMSA-MK―6-IL-2)を第5日および第10日に計2回腹腔内投与し、第12日に摘出した腫瘍から腫瘍内リンパ球(TIL)を調整した。具体的には、摘出した腫瘍をハサミ等で小片化したのち10mLのDissociationバッファー(10%ウシ胎仔血清(FBS,Hyclone社)添加PRMI-1640(FujiFilm-Wako社18902025)/ペニシリン100units/ml/ストレプトマイシン100units/ml、DNaseI(Sigma-Aldrich#DN25-100MG,50μg/mL添加)に浸し37℃、30分間 122rpmで振盪した(タイテック社BR-53FP)。細胞浮遊液は70μmストレーナー(BD Falcon)を通してシングル細胞化した後、TIL(CD45)MicroBeads,マウス(Miltenyi社#130-110-618)を用いて、MACS Pro Separator(Miltenyi社)により、血液系細胞(CD45+)細胞をTILとして調整した。調整したTILをFACS解析した結果を図16に示す。Treg細胞(CD4+CD25+FoxP3+)、CD8+T細胞、PD-1+CD8+T細胞、CD4+T細胞、NK細胞(CD3-CD49b+NKp46+)をFACSで解析し、それぞれの細胞数を定量した。CD8/Treg比は、CD8+T細胞数をTreg細胞数で除した相対値で示す。使用した抗体は、CD3ε:145-2C11,BioLegend(株)、CD4:RM4-4,BioLegend(株)、CD8a:53-6.7,BioLegend(株),CD25(IL-2Rα):PC61,BioLegend(株),NKp46:29A1.4,BioLegend(株),FoxP3;FJK-16s,DB Biosciences(株)、PD-1:29F.1A12,BioLegendである。結果を図24bに示す。図24bに示すように、成熟MK-6-IL-2ーマウスアルブミン(配列番号12)を投与したマウス由来のTILでは、成熟MK-14-IL-2ーマウスアルブミン(配列番号13)を投与した群に比べてCD3+T細胞群の割合が有意に高く、CD4+T細胞群におけるTreg(%)が有意に少なかった(図24b)。さらに、PBS投与群および成熟MK-14-IL-2ーマウスアルブミン投与群に比べてCD8/Treg比が有意に上昇した。
(a)BALB/cマウス(8週令、日本エスエルシー(株)に対して等量モルにあたるMK-6 (配列番号3)(25 mg), MSA-MK-6 (配列番号12)(65 mg)を腹腔内投与した。各IL-2はNanoLuc(商標)ルシフェラーゼ配列(Promega Corporation、USA)を融合させてある。、投与後の血中IL-2をNanoLuc(商標)活性により定量した。投与後1時間後を起点とした、ベータ相(β相)における半減期(Mean β half-lives (t1/2) )± SD(標準偏差)を測定した。%残存率(%Remaining)とは、投与後1時間の各NanoLuc活性測定値を各時点におけるNanoLuc活性測定値で除した相対値(%)で示す。 β相とは、後の血中濃度推移において,初期に急速に減衰する相(α相)に引き続きゆっくり減衰する相(β相)を指し,この相で半減期を算出するものである。結果を24aに示す。図24aが示すように薬物投与後の血MSAを融合した成熟MK-6-IL-2ーマウスアルブミンでは、t1/2 が5.6時間であり、t1/2が2.9時間である成熟MK-6-IL-2と比較して大幅に血中半減期が長くなっていた。(b)CT26大腸癌担癌モデルマウスにおける腫瘍内IL-2の定量:5x105個のCT26細胞(東北大学加齢医学研究所医用細胞資源センターより購入)を100μLの1×D-PBS(-)に懸濁し、26G針および1mLシリンジを用いて、BALB/cマウス(8週令、日本エスエルシー(株))の背部に皮下移植した。均一サイズ成長した腫瘍に対し成熟MK-6-IL-2(配列番号3)および成熟MK-6-IL-2ーマウスアルブミン(配列番号12)を1回のみ腹腔内投与した。投与1時間後に、腫瘍を摘出し、1×D-PBS(-)を添加した後にバイオマッシャー(商標、ニッピ(株))を用いて腫瘍を破砕した。NanoLuc活性はプロメガ(株)のNano-Glo(登録商標) Luciferase Assay Systemを用いて検体を調整し、ベルトールドジャパン(株)のLumat3 LB9508を用いて定量した。結果を図25bに示す。図25bが示すように、成熟MSA-MK-6-IL-2が腫瘍に有意に高い濃度で蓄積していることが示された。
Claims (7)
- 配列番号3で表されるアミノ酸配列又は配列番号3のアミノ酸配列に対して少なくとも95%の配列同一性を有し、かつ35位、38位、42位又は43位、及び45位のアミノ酸が全てAであるアミノ酸配列を有するIL-2変異体タンパク質。
- アルブミン及び/又は免疫グロブリンとの融合タンパク質である請求項1に記載のIL-2変異体タンパク質。
- 免疫グロブリン部分が抗体のFc部分である、請求項2に記載のIL-2変異体タンパク質。
- アルブミン-IL-2、IL-2-アルブミン、アルブミン-IL-2-免疫グロブリン、免疫グロブリン-IL-2-アルブミン、アルブミン-免疫グロブリン-IL-2-アルブミン又はアルブミン-IL-2-免疫グロブリン-アルブミンである、請求項2に記載のIL-2変異体タンパク質。
- IL-2受容体βおよびγを発現する細胞を活性化させる能力を有し、かつ配列番号2で表されるアミノ酸配列からなるIL-2変異体タンパク質と比較してIL-2受容体αに対する結合性が抑制されている、請求項1に記載のIL-2変異体タンパク質。
- 請求項1に記載のIL-2変異体タンパク質を含む医薬。
- 癌を予防又は治療するための請求項6に記載の医薬。
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| WO2023232810A1 (en) * | 2022-05-30 | 2023-12-07 | Ecole Polytechnique Federale De Lausanne (Epfl) | Highly effective adoptive t cell therapy |
| US11896648B2 (en) | 2020-10-22 | 2024-02-13 | Gilead Sciences, Inc. | Interleukin-2 variant proteins fused to human IgG4 Fc and uses thereof |
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| US11896648B2 (en) | 2020-10-22 | 2024-02-13 | Gilead Sciences, Inc. | Interleukin-2 variant proteins fused to human IgG4 Fc and uses thereof |
| WO2023232810A1 (en) * | 2022-05-30 | 2023-12-07 | Ecole Polytechnique Federale De Lausanne (Epfl) | Highly effective adoptive t cell therapy |
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| EP4215542A1 (en) | 2023-07-26 |
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