EP1483293A2 - Utilisation d'une substance active se liant a cd28 pour la preparation d'une composition pharmaceutique - Google Patents

Utilisation d'une substance active se liant a cd28 pour la preparation d'une composition pharmaceutique

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Publication number
EP1483293A2
EP1483293A2 EP03717153A EP03717153A EP1483293A2 EP 1483293 A2 EP1483293 A2 EP 1483293A2 EP 03717153 A EP03717153 A EP 03717153A EP 03717153 A EP03717153 A EP 03717153A EP 1483293 A2 EP1483293 A2 EP 1483293A2
Authority
EP
European Patent Office
Prior art keywords
cells
mab
superagonistic
specific
regulatory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP03717153A
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German (de)
English (en)
Inventor
Thomas Huenig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Theramab LLC
Original Assignee
TeGenero AG
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Filing date
Publication date
Application filed by TeGenero AG filed Critical TeGenero AG
Publication of EP1483293A2 publication Critical patent/EP1483293A2/fr
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
    • C07K16/2818—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily against CD28 or CD152
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A61K39/39533—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals
    • A61K39/3955—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals against proteinaceous materials, e.g. enzymes, hormones, lymphokines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00—Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12—Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • A61K35/14—Blood; Artificial blood
    • A61K35/17—Lymphocytes; B-cells; T-cells; Natural killer cells; Interferon-activated or cytokine-activated lymphocytes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL

Definitions

  • Tumor cell have arisen.
  • the C'-D loop of CD28 comprises amino acids 52 to 66 of the above CD28 sequence (for numbering see also Ostrov, D.A., et al.; Science (2000), 290: 816-819).
  • the term “C'-D loop” should also be understood to mean any partial sequences from this.
  • a loop or a binding site arranged in it is freely accessible if none for a defined binding partner for the binding site in the loop steric hindrance due to sequences or molecules connected to the loop.
  • Regulatory T cells are CD4 + T cells which, when mixed with naive CD4 + T cells, inhibit their activation. These include in particular CD4 + CD25 + T cells. Another feature of regulatory T cells is a low expression of the high molecular isoforms of CD45 (human: RA) compared to other T cells. The constitutive expression of CD152 is typical for regulatory T cells.
  • CD4 + CD8-SP thymocytes are one of the major sources of regulatory T cells.
  • Homology denotes an at least 70%, preferably at least 80%, most preferably at least 90% sequence identity at the protein level, a homologous protein or peptide binding a defined binding partner with at least the same affinity. Sequence variations can include deletions, substitutions, insertions, and elongations.
  • a facial expression compound is a natural or synthetic chemical structure that behaves like a defined mAb in a defined binding assay, which the facial expression compound mimicizes.
  • the term mAb also includes structures which consist exclusively of the Fab fragment. It is also possible to use only the variable region, the heavy chain fragment being connected to the light chain fragment in a suitable manner, for example also by means of synthetic bridge molecules, in such a way that the binding regions of the chains form the antibody epitope.
  • the term antibody also includes (possibly complete) chimeric and humanized antibodies.
  • Superagonistic stimulation of the proliferation of CD 28 specific T cells means that no costimulation, i.e. no other binding event besides binding a mAb or a mimicriver connection to CD28 is required to stimulate or inhibit proliferation.
  • the activation of resting T cells for proliferation and functional differentiation first requires the occupation of two surface structures, so-called receptors: 1. the antigen receptor, which has a different specificity from cell to cell and for recognition of antigens, for example viral fission products, is necessary; and 2. the CD28 molecule which is equally expressed on all resting T cells, with the exception of a subset of the CD8 T cells of humans, which naturally binds to ligands on the surface of other cells of the immune system.
  • TH1 and TH2 cells are CD4-expressing T cells.
  • TH1 cells are also called pro-inflammatory T-helper cells
  • TH2 cells "support. The. Activation of B cells and. Secrete the cytokines IL-4, IL-5 and IL-10. The differentiation. From CD4 T cells to the above • functionally different subgroups is not only achieved by
  • CD28 deficient mice show normal TH1 but reduced TH2 dependent responses and the cytokine profile of TCR-transgenic CD4 cells is determined by CD28 ligation
  • T cells are important in autoimmune reactions. For example, in experimental animal models of multiple sclerosis, type I diabetes and inflammatory bowel diseases the ability of these cells
  • GBS Guillain-Barre syndrome
  • CDP chronic demyelinating polyneuropathy
  • CDP 10-20 per 100,000 people.
  • the invention teaches the use of a CD28-specific superagonistic monoclonal antibody (mAb) or one
  • Facial expression compound for this purpose, for the production of a pharmaceutical composition for induction and / or proliferation of regulatory T cells.
  • the invention is based on the knowledge that the active substances used according to the invention appear to be a very good means of treating Guillian-Barre syndrome and / or chronically demyelinating polyneuropathy and other autoimmune-related ones
  • the invention therefore further teaches the use according to the invention for the treatment of these diseases.
  • mAb can be a mAb, which is available with hybridoma cells as deposited under the DSM numbers DSM ACC2531 (mAb: 9D7 or 9D7G3H11) or DSM ACC2530 (mAb: 5th ILA or 5.11A1C2H3).
  • the mAb can be one or more of the sequences SEQ ID 9, 11, 13 and / or
  • SEQ ID 13 shows the nucleic acid sequence of the variable region of the heavy chain of a mAb 5.11A according to the invention.
  • SEQ ID 14 shows the peptide encoded thereby.
  • SEQ ID 15 shows the nucleic acid sequence of the variable region of the light chain of this mAb.
  • SEQ ID 16 is the peptide encoded thereby.
  • SEQ-ID 9 shows the nucleic acid sequence of the variable region of the light chain of a mAb 9D7 according to the invention.
  • SEQ-ID 10 shows the peptide encoded thereby.
  • SEQ ID 11 shows the nucleic acid sequence of the variable region of the heavy chain of this mAb.
  • SEQ-ID 12 is the peptide encoded thereby. Show SEQ ID 18 and 19
  • the invention also relates to curative methods in which a disease based on low regulator T cell numbers or high T lymphocyte infiltration in organs or tissues, for example a person suffering from GBS and / or CDP, an inventive pharmaceutical composition in pharmacologically effective dosage and is administered in galenic preparation suitable for administration.
  • a disease based on low regulator T cell numbers or high T lymphocyte infiltration in organs or tissues for example a person suffering from GBS and / or CDP
  • an inventive pharmaceutical composition in pharmacologically effective dosage and is administered in galenic preparation suitable for administration.
  • Fig. 4 Binding of different human CD28 specific mAb to CD28 (a) and costimulatory (b) and • superagonistic (c) activity of the mAb of Figure 4a,
  • Fig. 5 Binding experiments which prove that superagonistic mAb bind specifically to 'the C'-D loop
  • Fig. 11 Induction of CD4 + CD25 + proliferation
  • Fig. 15 Disease course of the active EAN under
  • Fig. 17 Treatment corresponding to Fig. 15, but with a different treatment plan
  • Proliferation of the indicator cells with and without stimulation (CD3 / anti CD28), B: suppression of the proloferation of the indicator cells in the presence of expanded CD4 + CD25 +++ T cells.
  • FIG. 1 shows the stimulation of freshly isolated T lymphocytes in the form of a 3H-thymidine incorporation in the rat.
  • the methodology corresponds to that described in reference W098 / 54225, to which full reference is made here and below, and the contents of which are hereby incorporated into the present text.
  • the costimulation is shown in FIG. 1 a, ie T-cell receptor (TCR) -specific mAbs were bound to the plastic surface in all wells. In the absence of costimulation, the negative control (top row) shows no installation. Costimulation is then given in soluble form by the addition of CD28-specific mAb. The entire range of CD28-specific mAb shown was used.
  • This series of different CD28-specific mAbs originates from an approach of immunization and production of hybridoma cell lines already described in WO98 / 54225.
  • the culture supernatants contained enough CD28-specific mAb for saturating binding to 2 ⁇ 10 5 T cells. It can be seen from FIG. 1 a that all of these mAb are capable of activating in a costimulating manner, ie in the presence of the anti-TCR mAb the thymidine incorporation to stimulate. The stimulation in the absence of TCR-specific mAb is shown in FIG. 1b.
  • This experiment was also carried out as described in reference W098 / 54225. It can be seen that only two mAbs are able to stimulate T lymphocytes in the absence of a TCR signal. So these mAb have superagonistic activity.
  • CD28-specific mAbs bind to different areas of the CD28 molecule.
  • the mAbs were prepared by immunizing mice with rat CD28; therefore, as expected, they all do not react with mouse CD28 (not shown). Since the mAb can therefore only recognize those regions of the rat CD28 molecule which differ from that of the mouse, a sequence comparison between CD28 of the mouse and the rat was first carried out (see FIG. 2, upper part). The differences between the two species are highlighted. The one-letter code was used to name the amino acids. JJ319 was used as a prototype for a conventional rat CD28-specific mAb, and JJ316 was used for a superagonistic mAb (see W098 / 54225).
  • FIG. 3 The mapping of the binding is shown in FIG.
  • Expression plasmids were constructed in which part of the extracellular domain of CD28 originates from the mouse and another part from the rat. This is represented symbolically by bars and dashes; to the right is shown the binding of mAb JJ316 and JJ319 to mouse fibroblasts (L929 cells) that had been transfected with these expression plasmids.
  • Fig. 3 m / r and r / m 1-37
  • the binding of both antibodies to the "right" half of the sequence is mapped: both bind if this originates from the rat; No binding takes place in the reverse construct (rm CD28 1-37, left rat, right mouse).
  • the third line (m / r CD28 1-66) shows that JJ316 no longer binds, while the part of the rat sequence ("right") that is still available is still sufficient for recognition by JJ319. Accordingly, the two mAb recognize different epitopes on the CD28 molecule, and the binding of the superagonist JJ316 must therefore be sought in the region that originated from the rat in the first line construct, but not in the third line construct.
  • the clear candidate for this is the area encased in FIG. 2.
  • mice were immunized with human CD28-transfected A20 / J mouse B lymphoma cells (see WO98 / 54225) and additionally before the fusion with commercially available human CD28-FC
  • Fusion protein boosted (purchased from R and D Systems).
  • approximately 20 were identified from several thousand cell lines that produce human CD28-specific mAbs (binding to mouse L929 cells that express human CD28 but not to untransfected L929 cells), analogously to the screen in reference W098 / 54,225th Two of these showed the desired superagonistic activity (9D7 and 5.11A), while all new mAbs have conventional costimulatory activity.
  • the two superagonistic mAbs are described in particular below.
  • the newly generated mAb 7.3B6 is used as an example of a conventional human CD28-specific mAb.
  • FIG. 4a shows that the preparations used for the three new mAbs bind to human T lymphocytes comparatively well and also with a comparable titer.
  • An experiment is shown in which freshly isolated mononuclear cells from human blood (so-called PBMC) were first treated with various dilution levels of the mAb used on ice; then it was washed and the bound mAb visualized by a fluorescent dye-labeled secondary antibody that specifically recognizes the bound mouse mAb.
  • PBMC mononuclear cells from human blood
  • the binding of the titrated mAb could be determined selectively for CD4 T lymphocytes by electronic gating.
  • MFI indicates the average fluorescence intensity, which is a measure of the amount of bound CD28-specific mAb.
  • concentrations represent 3-fold dilutions of a standardized 'starting preparation. It is quite normal that the highest concentration gives a weaker signal than the following titration steps in this test; this has to do with the avidity (bivalent binding) of mAb and plays no role in the contexts discussed here.
  • Figures 4b and c compare the ability of superagonistic human CD28-specific mAb with that of conventional CD28-specific mAb - in the presence and absence of a ' TCR signal - to stimulate freshly isolated human T cells to grow. A 3H-thymidine incorporation is again shown, as described above for the rat.
  • the wells were coated with a mAb that reacts with the human TCR / CD3 complex. So costimulation was measured. It can be seen that there is no proliferation without costimulation with one of the mAbs (negative control), but all three antibodies are able to stimulate cell division.
  • Figure 4c was worked in the absence of a TCR / CD3 specific mAb. Only antibodies 9D7 and 5. ILA were able to stimulate superagonistically.
  • FIG. 1 A three-dimensional model of the CD28 molecule is shown in FIG. The newly identified binding region is highlighted. It corresponds to the encased sequence in Figure 2.
  • the extracellular The domain of CD28 belongs structurally to the so-called immunoglobulin superfamily, which is characterized by two ß-leaflets one above the other as the basic structure. These tapes are labeled according to a pattern given in the literature. It is important for the representation shown here that the region identified as an epitope for superagonistic CD28-specific mAbs in rats and mice is referred to as "C'-D loop".
  • mAb with specificity for the C'-D loop of the CD28 molecule have superagonistic activity, that is to say can be used in the sense of literature reference W098 / 54225 for activating T lymphocytes.
  • the superagonistic activity of the C'-D loop of specific mAbs in rats and humans shows that it is not the sequence of the epitope that matters, but its location or shape.
  • FIG. 7 shows that there is no IL-2 production without stimulation (negative control). Stimulation with a T cell receptor-specific mAb induces IL-2 production (positive control).
  • FIG. 7 shows that there is no IL-2 production without stimulation (negative control). Stimulation with a T cell receptor-specific mAb induces IL-2 production (positive control).
  • FIG. 7a shows the results when using the rat superagonistic mAb JJ316
  • FIG. 7b shows results for the mAb 5.11A specific for human C'-D loop.
  • the stimulation is not carried out by means of "conventional" CD28-specific mAb, since these not only do not bind to the C'-D loop, but cannot recognize the construct at all, because they are used for rat or are human-specific sequences that are not included in the construct.
  • FIG. 9 shows dot plots in which each measured cell is represented by a point.
  • the phenotypic characterization of the regulatory T cells was carried out by combining the cell surface molecules CD4 and CD25. For this purpose the cell suspensions are incubated with corresponding fluorescent dye labeled monoclonal antibodies to CD4 or CD25 •, washed and examined these antibodies in a fürflußzytophotometer for binding. The results shown were obtained three days after ip injection of a costimulatory (Fig. 9a, JJ319) or superagonistic CD28 specific mAb (Fig. 9b, JJ316).
  • CD4 T cells In the case of JJ319, about 7% of the CD4 T cells are also CD25 positive (4 / (50 + 4)), which corresponds to results not shown in untreated animals. In contrast, after treatment with JJ316, approximately 20% are CD4 + CD25 + (10 / (10 + 40)). In addition, the level of CD25 expression is much higher than in the control animal. Such a high level is characteristic of regulatory T cells.
  • FIG. 10 shows a phenotypic characterization in the form of a histogram.
  • the marker CD45RC was detected in FIGS. 10a to 10c, a high molecular isoform of the CD45 molecule, which is strong on naive CD4 T cells but low on stimulated CD4 T cells is expressed. Low expression is typical of regulatory T cells.
  • 10a shows that CD4 + CD25 cells from untreated animals mostly express CD45RC strongly. In contrast, in the case of CD4 + CD25 + cells from untreated animals, strong ones are found
  • FIG. 10b In the case of treatment with the superagonistic CD28-specific mAb (FIG. 10c), the down-regulation of CD45CD45RC is much more pronounced than in the case of FIG. 10b.
  • FIGS. 10d to 10e the CD152 (CTLA-4) constitutively expressed by regulatory T cells is detected by staining. This staining has to be carried out due to the intracellular localization of CD152 after permeabilization of fixed cells and is therefore associated with an unspecific background. To check this, a so-called isotype control was carried out, ie an intracellular staining was carried out with a mAb of the same immunoglobulin class, which, however, cannot recognize anything specifically.
  • the specific CD152 detection results as a shift of the CD152 histogram compared to the isotype control histogram. There is no shift in FIG. 10d and consequently no CD152 expression in the CD4 + CD25 cells.
  • FIGS. 10e In the untreated CD4 + CD25 + cells, a slight shift (FIG. 10e) and in the JJ316 (superagonistic CD28-specific mAb) treated cells, a stronger shift can be seen in accordance with the results of FIGS. 10a to 10c.
  • FIGS. 9 and 10 show phenotypically how regulatory T cells can be identified and that superagonistic CD28-specific mAb preferentially increase or induce regulatory CD4 T cells in vivo.
  • CD4 + CD25 + cells were isolated by electronic cell sorting either from untreated rats (FIG. 11a) or from rats treated with JJ316 (FIG. 11b) and cultured in 96 well plates according to the prior art. Cell proliferation was measured by 3H thymidine incorporation between days 2 and 3 of cultivation.
  • “(-)” means no stimulation
  • costimulation means stimulation with a non-superagonistic CD28 specific mAb (JJ319) as well as with the TCR specific R73
  • JJ316 shows the superagonistic stimulation.
  • Both Figures 11a and 11b show that regulatory T cells react poorly to costimulation, but well to stimulation with a superagonistic CD28 specific mAb. Stimulation with mAb used according to the invention thus shows a considerable increase in regulatory T cells even in cell culture.
  • FIG. 13 shows a representation corresponding to FIG. 10f, but after in vitro stimulation with superagonistic CD28-specific mAbs (JJ316). An even more detectable CD152 expression can be seen.
  • FIG. 13 shows the inhibitory function of regulatory T cells on CD4 + CD25 T cells, which serve as indicator cells for the suppressive effect.
  • CD4 + CD25- T cells were used for costimulation (R73 + JJ319).
  • the 3H thymidine incorporation was measured between days 2 and 3 of the cultivation.
  • CD25 + means electronically sorted CD4 + CD25 + T cells from animals treated three days earlier with superagonistic CD28-specific mAb (JJ316).
  • CD25- stands for the indicator cells.
  • CD25 + / CD25- in Fig. 13a means that both cell populations were mixed together in equal parts. It can be seen that the CD25 + cells do not respond to costimulation with proliferation. In addition, the proliferation of indicator cells is suppressed.
  • 13b shows a titration of the regulatory T cells by mixing them with indicator cells in different proportions. It can be seen that suppression can still be observed even when the ratio of regulatory to indicator cells is 1:16. This shows the high effectiveness of the regulatory cells stimulated with mAb used according to the invention.
  • FIG. 14 shows a comparison of the reactions of human CD4 + CD25 T cells (naive cells) to CD4 + CD25 + T cells (regulatory cells) in response to costimulation (anti-CD3 + conventional anti-CD28 mAb) or to human specific superagonistic CD28 specific mAb (9D7 and 5.11A).
  • the experiments correspond to those described above for the rat. Starting from the left, the first three groups show unstimulated controls (no 3H thymidine incorporation). These are the entire CD4 + T cells, then the CD25 fraction obtained by sorting and finally the CD25 + fraction obtained by sorting, "med” means medium. This is followed by two groups, in which was stimulated superagonistically (9D7 and 5.11A).
  • the regulatory T cells react better to the stimulation with superagonistic CD28-specific mAbs compared to the total population of the CD4 + cells and their CD25 fraction.
  • the last group of three shows the results of conventional costimulation. In contrast, the reaction of the unseparated T cells and the CD25 fraction is rather better.
  • FIG. 15 shows the course of the disease of the active EAN under treatment with various mAbs.
  • 7-8 week old female LEW rats available from Charles River Laboratories (Sulzfeld, Germany) were used.
  • the animals were immunized with a synthetic peptide which corresponds to a part of the myelin protein P2 which surrounds peripheral nerve fibers (amino acids 53-78 of the bovine P2 protein, 50 ⁇ l of a 0.5mg / ml solution, inoculation in the balls of the feet).
  • peripheral nerve fibers amino acids 53-78 of the bovine P2 protein, 50 ⁇ l of a 0.5mg / ml solution, inoculation in the balls of the feet.
  • progressive paralysis develops, which can be quantified according to standardized scoring (King et al., Exp Neurol, 87: 9-19 (1985).
  • Figure 15a shows preventive therapy with superagonistic CD28-specific mAbs (JJ316 15b Treatment with conventional mAb (JJ319)
  • the application was carried out ip in lmg / animal doses either on the day of the P2 immunization (DO), on day 12 (D12), ie after the onset of symptoms, or on both days.
  • the different groups included 3 to 6 animals.
  • a comparison of FIGS. 15a and 15b shows that treatment with superagonistic CD28-specific mAb is significantly more effective than treatment with conventional mAb.
  • FIG. 16 shows results corresponding to FIG. 15, but with a prophylactic treatment, d-7 being treatment 7 days before the immunization, d-21 21 days before the immunization. It can be seen that a resistant status can be achieved by increasing regulatory T cells when treated within a week before the immunization, but not when treated 3 weeks before the immunization.
  • FIG. 17 is based on a procedure as in FIG. 15, but treatment with JJ316 on day 0 and 4.
  • FIG. 17a shows the course of the disease in accordance with the illustration in FIG. 15a.
  • FIG. 17b shows electrophysical properties, namely the speed of the conduction as a direct clinical parameter for the damage to the sciatic nerve.
  • the measurements were carried out according to the literature Adlkofer et al. Nat Genet, 11: 274-280 (1995) and Heininger et al. , Ann Neurol, 19: 44-49 (1986).
  • the pathological findings can be seen in the control groups, particularly in the prolongation of the N1 and F latencies (see days 0 and 12, open symbols).
  • FIG. 18 shows results of a therapy of passive or adoptive transfer EAN (AT-EAN). This is not induced by immunization with the nerve antigen, as described above, but rather an intravenous injection of an autoreactive CD4 + T cell clone with specificity for the P2 myelin antigen (8xl0 ⁇ 6, cell line G7) according to the Stienekemeier et al. , Brain, 122: 523-535 (1999).
  • FIG. 18a shows the course of the disease in a control group, in the case of treatment with JJ316 on day 1 (dl) and in the case of treatment on day 3 (d3). It is remarkable that even after the onset of the symptoms of the disease, ie treatment on day 3, the disease can be stopped.
  • CD4 + CD25 +++ T cells expanded by means of monoclonal antibodies according to the invention also have their functional properties, e.g. the suppression of the proliferation of "conventional" T cells.
  • the CD4 + T cells were purified from human peripheral mononuclear cells (PBMC) by means of magnetic separation
  • CD8 +, CDllb +, CD16 +, CD19 +, CD36 + and CD56 + cells were then loaded with a CD25-specific antibody and subsequently a PE-conjugated secondary antibody, sorted into CD4 + CD25 +++ and CD4 + CD25-T cells (see FIG. 19) and after addition of monoclonal antibodies according to the invention coupled to Dyna-beads ( hulG4) and interleukin 2 (IL-2) cultivated (day 0). On day 5, the expanded cells were stained with anti-CD4 and anti CD-25 on the cell surface, and intracellularly with anti-CTLA-4 and Ki-67.
  • hulG4 Dyna-beads
  • IL-2 interleukin 2
  • expanded CD4 + CD25 +++ or CD4 + CD25-T cells were mixed with the CFSE-labeled indicator cells in a ratio of 1: 1 or 1: 5 and co-cultivated (stimulation with anti-CD3 mAb, clone HIT3a, final concentration 0.1 ⁇ g / ml, and anti-CD-28 mAb, clone CD28.2, final concentration 0.05 ⁇ g / ml).
  • Figure 22b shows that the number of cell divisions in the indicator cells was greatly reduced by the presence of the expanded CD4 + CD25 +++ T cells, while the CD4 + CD25-T cells showed only a slight effect.

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Abstract

L'invention concerne l'utilisation d'un anticorps (mAb) monoclonal super-agoniste spécifique de CD28 ou d'une liaison de mimétisme associée pour préparer une composition pharmaceutique destinée à l'induction et/ou à la multiplication de cellules T de régulation.
EP03717153A 2002-03-13 2003-03-13 Utilisation d'une substance active se liant a cd28 pour la preparation d'une composition pharmaceutique Ceased EP1483293A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10212108A DE10212108A1 (de) 2002-03-13 2002-03-13 Verwendung einer an CD28 bindenden Wirksubstanz zur Herstellung einer pharmazeutischen Zusammensetzung
DE10212108 2002-03-13
PCT/DE2003/000890 WO2003078468A2 (fr) 2002-03-13 2003-03-13 Utilisation d'une substance active se liant a cd28 pour la preparation d'une composition pharmaceutique

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EP1483293A2 true EP1483293A2 (fr) 2004-12-08

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AU2003221604A1 (en) 2003-09-29
AU2003221604A8 (en) 2003-09-29
WO2003078468A3 (fr) 2004-02-12
US20070134240A1 (en) 2007-06-14
DE10212108A1 (de) 2003-10-02
US20040092718A1 (en) 2004-05-13
WO2003078468A2 (fr) 2003-09-25
US20130266577A1 (en) 2013-10-10
US8389016B2 (en) 2013-03-05
US20060188493A1 (en) 2006-08-24

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