WO2002077222A1 - Gene panel participating in liver regeneration - Google Patents
Gene panel participating in liver regeneration Download PDFInfo
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- WO2002077222A1 WO2002077222A1 PCT/JP2002/002372 JP0202372W WO02077222A1 WO 2002077222 A1 WO2002077222 A1 WO 2002077222A1 JP 0202372 W JP0202372 W JP 0202372W WO 02077222 A1 WO02077222 A1 WO 02077222A1
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Definitions
- the present invention relates to a gene panel consisting of a group of genes whose expression level fluctuates during liver regeneration as compared to normal in liver cells, a method for preparing the same, and a method for preparing the gene panel. It is about usage. These inventions are useful in the fields of diagnosis, medicine and the like.
- Background Art In partial hepatectomy for liver cancer treatment or partial resection liver transplantation for liver disease treatment, prompt regeneration of the remaining liver or transplanted liver is an important matter, but there are many cases where liver regeneration is poor.
- Adult livers are often fatty livers, but fatty livers are often poorly regenerated, which can cause problems after partial hepatectomy.
- liver regeneration is promoted in order to compensate for the damaged liver.However, if regeneration is delayed, it is thought that hepatitis will worsen, sometimes leading to fulminant hepatitis with a poor prognosis. It could be.
- liver regeneration starts immediately after partial hepatectomy in rats and returns to the size of hepatocytes before resection in approximately one week. Liver regeneration is thought to be driven by the interaction of several related genes, but the full picture of what genes work at what timing during the liver regeneration process is not known. Since a large number of genes are considered to be involved in liver regeneration, it is important to examine a number of important genes that play a role in liver regeneration in order to obtain an overall picture of liver regeneration. However, attempts have been made to reproduce liver regeneration in culture systems that combine genes and proteins that are thought to be involved in liver regeneration. Absent. In addition, there was a report of gene screening using the expression fluctuation as an index during liver regeneration (Xu W et.al., Biochem Biophys Res Commun, 278 (2): 31
- the present invention has been made in view of the above, and provides a gene panel consisting of a group of genes whose expression level fluctuates during liver regeneration in liver cells as compared to normal, and uses the same for liver regeneration.
- the problem is to provide a method of screening for a drug to be promoted.
- the present inventor thought that in order to promote liver regeneration, the behavior of genes involved in liver regeneration should be brought close to the pattern when liver regeneration is promoted. Then, using a rat subjected to partial hepatectomy, the expression profile of various genes in liver regeneration was examined, and expression information on genes involved in liver regeneration was obtained. As a result, the present invention was completed.
- the present invention is as follows.
- a gene panel consisting of the names of genes whose expression levels fluctuate during liver regeneration compared to normal in liver cells and the expression profiles of those genes.
- a method for preparing a gene panel comprising expression profiles of a group of genes whose expression levels fluctuate during liver regeneration compared to normal in liver cells comprising the following steps:
- (c) a step of identifying a group of genes whose expression levels fluctuate during liver regeneration, and creating an expression profile from each gene name and information on the fluctuations in the expression levels.
- liver regeneration promoting substance is L-alanine.
- the gene expression level is analyzed by one or more selected from gene chip method, ATAC-PCR method, or Taqman PCR (SYBR Green) method (10) to (13). the method of.
- a method for evaluating the state of a liver comprising performing expression profiling of the gene constituting the gene panel of (1) with respect to the liver of the subject.
- the present invention will be described in detail.
- the gene panel of the present invention is a gene panel comprising names of genes whose expression levels fluctuate during liver regeneration in liver cells as compared to normal, and expression profiles of those genes.
- the gene panel of the present invention can be prepared by the following steps.
- Liver regeneration refers to a phenomenon in which, when some cells in the liver are damaged or lost due to resection, the condition is restored and the liver returns to its normal state. For example, it is a phenomenon observed in the remaining liver or transplanted liver after partial hepatectomy in the treatment of liver cancer or partial resection liver transplantation in the treatment of liver disease.
- the expression level of a gene is synonymous with the expression level, expression intensity, or expression frequency of the gene, and is usually analyzed based on the production amount of a transcript corresponding to the gene, the activity of its translation product, and the like.
- the gene expression level can be measured using a method usually used for gene expression analysis.
- Preferred methods include, for example, gene chip method, genetic Child microarray method and gene macroarray method.
- a method is used in which gene fragments are arranged and pasted on some plate (usually a slide glass). The chip and the fluorescently labeled mRNA are hybridized, and the type and amount of the mRNA are measured.
- ATAC-PCR and Taqman PCR (SYBR Green).
- the ATAC-PCR method is a type of quantitative PCR method developed by Kato et al. (Kato, K. et al., Nucl. Acids Res., 25, 4694-4696, 1997), Is characterized by the ability to quantify the expression of
- the quantitative quantification of gene expression of dozens of genes has been the limit in the conventional quantitative PCR method, whereas the ATAC-PCR method enables the measurement of the expression of more than 1000 types of genes.
- Taqman PCR (SYBR Green method) is a general method of quantitative RT-PCR (Schmittgen TD, Methods 25, 383-385, 2001).
- the feature is that primer design is easy. Moreover, the operation is simple, and the expression of many genes can be measured in a short time (40 to 150 genes / 2 hours).
- Other gene expression analysis methods include the Body Map method (Gene, 174, 151-158 (1996)) and the Serial analysis is of gene express ion (SAGE) method (US Pat. Nos. 527, 154, 544, 861, European Patent Publication No. 0761 822), MAGE (Micro-analys isof Gene Ex press on) (JP-A-2000-232888), and the like.
- the outline of the Body Map method is as follows.
- the mRNA is ligated to the poly T sequence on the vector and the poly A tail at the 3 'end of the mRNA, and cDNA is synthesized using the vector poly T sequence as a primer.
- the cDNA is digested with the restriction enzyme Mbol. Since there is one Mbol site for every 300 base pairs on the cDNA, the cDNA on the vector is divided into 300 base pairs on average. At this time, the cMA from the poly A tail remains connected to the vector.
- the vector containing the cDNA fragment is closed and introduced into Escherichia coli to produce a cDNA library.
- Approximately 1000 clones are arbitrarily selected from the library, and the base sequence of an average of 300 base pairs is determined for each clone. From those sequences, the clones containing the same sequence are grouped together, and the type and appearance frequency of each sequence are calculated to obtain a gene expression profile.
- Each cDNA sequence is subjected to a homology search (BLAST search) with a data bank, and a clone having the same sequence as a known gene is given the name of the gene. If the sequence is not registered in the databank, It is assumed that no corresponding gene exists.
- a cDNA fragment of about 300 base pairs in the body map is further reduced to a short fragment of 11 base pairs or more (“tag (t ag) ”), and by linking a large number of these fragments to each other and inserting them into a vector, a library of linked tags is created.
- the DNA sequence of the linking tag As with the Body Map, about 1000 clones can be selected arbitrarily. However, if the DNA sequence of the linking tag is determined, more gene expression information can be expected with the same number of steps as the Body Map.
- a tag represents a gene sequence, and the frequency of appearance of the tag indicates the frequency of expression of the gene.
- the length of a DNA sequence that can be read in one sequence is about 600 base pairs, so that a DNA sequence of up to about 50 tags can be read in one sequence. In other words, gene expression profile analysis can be performed up to 50 times more efficiently than the Body Map method.
- the SAGE method is a gene expression profile analysis method based on the above idea.
- the SAGE method is performed as follows.
- a cDNA was prepared using poly T having a 3'-end of biotin as a primer, and the cDNA was cut with a restriction enzyme such as Mbol (called an anchoring enzyme) in the same way as the body map.
- Mbol a restriction enzyme
- the cDNA fragment containing the 3 'end bound with biotin was adsorbed to avidin beads, the beads were bisected, and the cDNA fragment (approximately 13 bp) adsorbed on each bead was combined with two linkers (A or A).
- Each linker should contain a site for a Class II restriction enzyme (called a “tagging enzyme”) such as BsmFI.
- the MAGE method is an improvement on the above method, in which cDNA is synthesized from mRNA using a vector primer having a poly-T sequence, the cDNA sequence is tagged on the vector, and the resulting tag is ligated to the end of the tag.
- the method is not particularly limited as long as it can analyze the expression level of the gene, and any of a currently known method and a method developed in the future can be employed.
- the gene chip method or the gene microarray method particularly preferred are the gene chip method or the gene microarray method, the ATAC-PCR method, and the Taqman PGR (SYBR Green) method.
- the analysis of the expression level of the gene may be performed based on the results obtained by a single method, or may be performed by combining the results obtained by a plurality of methods.
- a single method can perform a certain amount of analysis, a combination of multiple methods can provide more accurate analysis.
- a correlation coefficient is calculated for the results obtained by a plurality of methods, for example, the gene chip method, and the results obtained by the ATAC-PCR method. Assess that the level has changed.
- the fluctuation of the gene expression level is determined by measuring the expression levels of various genes in liver cells during normal time and the expression levels of the genes during liver regeneration, and comparing the respective expression levels. Can be analyzed.
- the gene expression level during liver regeneration is analyzed, for example, by measuring the gene expression level of liver cells after resection using a model animal such as a rat from which a part of the liver has been resected. Normal gene expression levels, on the other hand, are typically measured just prior to excision.
- the analysis of the gene expression level is preferably performed over time during liver regeneration. As described above, genes whose expression levels fluctuate during liver regeneration are identified. By assigning information on the analyzed fluctuations in the expression level to each identified gene, an expression profile of the gene group is created.
- genes whose expression levels fluctuate during liver regeneration as compared to normal include genes that are presumed to be involved in L-alanine metabolism.
- L-alanine is known to promote liver regeneration (Maezono K et. Al., Hepatology 24 (5), 1996; JP-A-5-229940).
- an increase in plasma L-alanine concentration after hepatectomy in humans (Nijveldt RJ. Etal., Liver 21 (1), 56-63 (2001)), and L-alanine in liver tissues after hepatectomy in rats Accumulation (Brand HS. Et al., J Hepatology 23, 333-340 (1995)).
- ATA 2 amino acid transporter system A
- liver regeneration promoting substance may be administered during or before and after liver regeneration.
- liver regeneration promoting substances include a mixture of liver extract and flavin adenine dinucleotide (liver extract 151, FAD 10 mg / l ml), liver hydrolyzate, Saiko Keishi-to, Sho-saiko-to, diisop dichloroacetate , Placenta hydrolyzate, valine (W00113912), vascular growth factor (VEGF, VPF) (00132213), macrolide compound (JP3240728), TCF II (JP10194986), TGF- / 3 release. (JP8333249), glucose-1-phosphate, dalcose-6-phosphate (JP2202821), and desialylated orosomucoid (JP6122025).
- liver extract 151 flavin adenine dinucleotide
- FAD 10 mg / l ml liver hydrolyzate
- Saiko Keishi-to Sho-saiko-to
- the gene panel of the present invention includes at least the names of various genes identified as described above and the expression profile of each gene.
- the name of the gene is not particularly limited as long as it can be distinguished from other genes, but typically, the name of the product encoded by the gene, the accession number on a database such as GenBank, or the gene name Or the name of the probe set on the gene chip Gene names and the like are used.
- the “expression profile” refers to information on the fluctuation of the expression level of each gene included in the gene panel.
- the expression level is measured and recorded over time.
- the expression level of the gene may be represented by an absolute value or a relative value.
- each gene is classified by the expression level at a certain time after hepatectomy. For example, 1 hour and 6 hours after hepatectomy (early stage of liver regeneration), groups whose expression is significantly increased (groups 1 and 2), conversely decreased (groups 6 and 7), 24 hours and 4 hours Expression increased markedly at 8 hours (middle liver regeneration) (groups 3 and 4), conversely decreased (groups 8 and 9), expression increased significantly 7 days after hepatectomy (late liver regeneration) Dal-Dup (Group 5) is classified into a decreasing group (Group 10).
- the remarkable expression here is that if the increase or decrease in expression is 3 times or more in the case of Gene chip compared to that before hepatectomy, and if there is a difference in the Taqman-PCR (SYBR Green) It is assumed that there is a difference.
- each group is ordered by the time that expression is maintained at that level after expression has increased or decreased, or the time that continues to increase or decrease, as listed in Table 1. Can be lined up.
- the gene panel preferably includes information on liver weight at a certain time after hepatectomy. For example, livers in the early stage of liver regeneration (1 hour and 6 hours after hepatectomy), the middle stage of liver regeneration (24 hours and 48 hours after hepatectomy), and the liver in the late stage of liver regeneration (7 days after hepatectomy) are extracted, respectively. Measuring liver weight,
- the gene panel of the present invention may include sequence information of a PCR primer group for analyzing the expression level of each gene.
- the primer include a primer group consisting of all or a part of the oligonucleotides shown in SEQ ID NOs: 1 to 127 and 135 to 192.
- the base sequence information of the adapter used in the ATAC-PCR method and / or the Taqman PCR (SYBR Green) method may be included.
- SEQ ID NOS: 1 to 127 are primers for ATAC-PCR
- SEQ ID NOs: 135 to: L92 are primers for Taqman PCR (SYBR Green).
- Adapter I As an example of the base sequence, an adapter having the base sequence shown in SEQ ID NO: 128 to 133 can be mentioned.
- a drug involved in hepatic regeneration can be screened by administering a drug to a model animal or liver tissue or cells and performing expression profiling of the genes constituting the gene panel of the present invention. That is, a drug whose expression profile is similar to the expression profile in the gene panel by administration of the drug is considered to promote liver regeneration.
- Screening for a drug that further increases the expression of the gene of this gene panel or a drug that further decreases the decrease in the expression of the gene of the present gene panel can also be used to screen for a substance promoting liver regeneration.
- screening can be performed by focusing on the changes in the expression of about six types of genes. An example of a screen based on this concept is shown in Examples below.
- Gene expression profiling methods include DNA microarray method using a slide glass or nylon membrane on which the gene fragments constituting the gene panel are fixed, MA macroarray method, ATAC-PCR method, Taqman probe. Or a quantitative PCR method using SYBR Green. Expression pro The firing may be performed by a single method or a combination of a plurality of methods. An example of a specific screening procedure will be described below.
- cultured hepatocytes are treated with the drug to be screened, or the drug is administered to rats, and RNA is prepared from cells or liver after a certain period of time.
- Conditions for culturing hepatocytes include ordinary culturing, and a method in which a substance that damages hepatocytes such as galactosamine, heavy metal ions, or carbon tetrachloride is added to the medium.
- a substance that damages hepatocytes such as galactosamine, heavy metal ions, or carbon tetrachloride.
- a candidate drug that is expected to show a liver regeneration promoting action in the primary screening is administered to rats that have undergone partial hepatectomy at regular intervals, for example, at the beginning of liver regeneration (1 hour, 6 hours after hepatectomy)
- the liver in the middle stage of liver regeneration (24 hours and 48 hours after hepatectomy) and the liver in the late stage of liver regeneration (7 days after hepatectomy) are removed.
- RNA is extracted from the liver and the change in gene expression is measured.
- the above-mentioned screening can be performed using an experimental animal other than a rat. In this case, it is preferable to regenerate a gene panel for a homolog corresponding to the rat gene and carry out screening.
- the following drug screening can be performed using the gene panel.
- Gene groups that fluctuate in the early stage of liver regeneration (for example, groups 1, 2, 6, and 7) are considered to be important gene groups for the initiation of liver regeneration. Therefore, by chemical treatment, By screening for drugs that show a similar pattern to those described above, it can be expected that drugs that are effective in initiating liver regeneration will be obtained.
- genes that begin to change during the middle stage of liver regeneration are considered to be genes that act on liver regeneration initiation and promote hepatocyte proliferation or differentiation. Can be Therefore, it can be expected that a drug that positively affects the proliferation or differentiation of hepatocytes can be obtained by screening for drugs that exhibit similar patterns to these by drug treatment.
- Genes that begin to fluctuate late in liver regeneration are considered to be genes that are important for termination of liver regeneration or normal hepatocyte function after regeneration is completed. Therefore, by screening for drugs showing similar patterns to these by drug treatment, drugs that negatively affect hepatocyte proliferation or drugs that are effective for normal hepatocyte function after regeneration is completed can be obtained. Can be expected. Drugs that have a negative effect on hepatocyte proliferation can be used for the purpose of suppressing hepatocyte hyperproliferation, and may be used as drugs for liver cancer and the like.
- the gene panel of the present invention is considered to be useful for screening of a drug that is effective in each process of liver regeneration (for example, cascade, cell growth, differentiation, cell growth arrest, etc.) By combining the drugs obtained as a result, it is thought that a more effective therapeutic agent for liver regeneration can be created.
- L-alanine is known to have a liver regeneration effect.
- L-alanine is easily metabolized in the body and disappears, so that sufficient drug efficacy cannot be obtained. Therefore, a drug that has the same medicinal properties as L-alanine and has better properties, for example, improved pharmacokinetics, and a longer-lasting effect is required.
- a drug that has the same medicinal properties as L-alanine and has better properties for example, improved pharmacokinetics, and a longer-lasting effect is required.
- This gene panel can be used in a system for evaluating In addition, by examining the gene variation pattern of each patient, it is possible to administer a drug suitable for each patient. For example, a series of drugs that specifically or positively regulate a specific gene (group) of the present gene panel are screened. Here, by examining the gene expression of the gene panel in each liver disease patient, it is possible to select drugs necessary for liver regeneration. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a diagram showing the structure of an adapter.
- FIG. 2 to 4 show the relative expression of L-alanin metabolism-related genes whose expression fluctuates when L-alanine is administered during liver regeneration.
- FIG. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically with reference to examples.
- Example 1
- F344 / DvCrj (Fischer) rats Anesthetized with ether at 10 weeks of age, the abdomen was incised, and the left and middle lobes were extruded from the incision.
- the left lobe, middle lobe and right lobe, and ridge were tied with sutures, and the right lobe and ridge were left in the body, and the left lobe and middle lobe were cut off. Thereafter, the incision was sewn with suture.
- the individual at 0 hours after resection was not sutured, and the remaining liver was subsequently removed. At 1 hour, 6 hours, 12 hours, 24 hours, and 168 hours after hepatectomy, resection was performed, and the remaining liver (regenerated liver) was removed.
- the weight of the remaining liver (right lobe, tail lobe) was about 30% of the weight of the whole rat liver (right lobe, left lobe, middle lobe, tail lobe).
- Three liver regeneration model rats were prepared, and the weight of the remaining liver at the time of removal was measured.It was 2 ⁇ 0.3 g (1.6 g) at 0 hours after resection, and 1.7 ⁇ 0.3 g (1.4 g) at 1 hour after resection. g), 2.1 ⁇ 0.5 g (2.1 g) at 6 hours after resection, 2.5 ⁇ 0.5 g (3.0 g) at 24 hours after resection, 2.5 ⁇ 0.5 g (2.0 g) at 48 hours after resection, 7 after resection 5.6 ⁇ 0.3 in days g (5.8 g) (however, the value in parentheses is the weight of the regenerated liver used for the measurement with the Gene Chip described later).
- Gene expression analysis by GeneChip was performed according to the protocol recommended by Affymetrix. The procedure is shown below.
- double-stranded cDNA was synthesized from the total RNA prepared in ⁇ 2> using a SUPERSCRIPT Choice System manufactured by Gibco BRL. 15 g of total RNA and T7- (dT) 24 primer lOOpmo 1 were dissolved in DEPC-treated water to give 11 zxl. After reacting at 70 ° C for 10 minutes, cool on ice. 5Xlst strand cDNA buffer (manufactured by Gibco BRL) 41, 0.1XDTT (dithiothreitol, manufactured by Gibco BRL) 21 1, 10mM dNTP mix (Gibco BRL) 1 liter) and kept at 42 ° C for 2 minutes.
- a biotin-labeled cRNA probe was synthesized from the double-stranded cDNA synthesized above using a Bio Array High Yield RNA Transcript Labeling Kit manufactured by Enzo.
- the RNeasy rain i spin column that had been adsorbed with a biotin-labeled cRNA probe as described above was transferred to a new tube.
- This RNeasy mini spin column was added with 30 il of DEPC-treated water, and left at room temperature for 1 minute. The mixture was centrifuged at 8000 rpm for 15 seconds to elute the purified biotin-labeled cRNA probe solution.
- the purified biotin-labeled cRNA probe solution was fragmented.
- Mix the biotin-labeled cRNA probe solution and 5X fragmentation buffer add 1/5 of the final solution volume, adjust the concentration of the biotin-labeled cRNA probe to 0.5 g / l, and react at 94 ° C for 35 minutes. I let it. 1% agarose gel electrophoresis was performed to confirm that the probe was fragmented to a length of about 100 bases.
- test chip TEST2 Chip
- Rat chipsets RG-U34A, RG-U34B, RG-U34C
- Hybridization was performed by the following procedure for both the test chip and the rat chip set.
- the hybridization cocktail was heat denatured by heating at 99 ° C for 5 minutes, placed at 45 ° C for 5 minutes, and centrifuged at 15000 rpm at room temperature for 5 minutes. The supernatant was collected for a test chip (TEST2 Chip) at 801 and a rat chip set (RG-U34A, RG-U34B, RG-U34C) for 2001 minutes, and used for hybridization.
- the Genechip was returned to room temperature and prehybridized in 1XMES buffer (Test2 chip: 801, rat chip set: 2001) at 45 ° C for 10 minutes at 60 rpm. Next, the pre-hybridization solution was removed, and the above-mentioned heat-denatured hybridization cocktail was added, and hybridization was carried out at 45 ° C. for 16 hours at 60 rpm.
- Hybridization data analysis was performed using the GeneChip Analysis Suite.
- the expression level of each gene was expressed as a relative value (Average Differences) with the average value of the expression of all genes as 100 (Table 1 (1) to (11)).
- the gene tip probe set name is the management number corresponding to each gene, which is named by affymetrix.
- the “unigene” is a collection of DNA sequences registered in GenBank for each gene (transcript) and each species.
- the Ohr column in the table shows the gene expression level measured in the rat liver at 0 hours after partial hepatectomy.
- the lhr, 6hr, 24hr, 48hr, and 7d columns show 1 hour after partial hepatectomy, respectively.
- Gene expression levels in rat liver at 6, 24, 48 and 7 days. 0hr / 0hr, lhr / Ohr, 6hr / 0hr, 24hr / 0hr, 48r / 0hr, 7d / 0hr are 0 hours, 1 hour, 6
- the second decimal point is rounded off.
- the value of the expression level was 0 or less, the value was set to 1 for convenience in obtaining the expression ratio.
- Gene panels were prepared using known genes (gene sequence structures including all 0RFs were registered on GenBank Database overnight, excluding those with clear partial sequences such as ESTs).
- ATAC-PCR is a technique developed by Kikuya Kato et al. (Kato, K. et al., Ucl. Acids Res., 25, 4694-4696, 1997), and uses competitive primers with fluorescent primers. Based on RT-PCR. ATAC-PCR can easily and quantitatively analyze the expression of many genes.
- the experimental procedure of the ATAC-PCR method performed here conforms to the method of Kato et al. (Kato, K. et al., Noel. Acids Res., 25, 4694-4696, 1997).
- double-stranded DNA was synthesized from cDNA synthesized using a 5'-biotinylated oligo dT primer, and cut with a specific restriction enzyme (here, an example using Mbol was described).
- a specific restriction enzyme here, an example using Mbol was described.
- an adapter (preparing six types with different lengths) having the same sequence at the end as the site cleaved by the restriction enzyme and a double-stranded DNA cleaved with the restriction enzyme MboI Ligation was linked.
- Three of the six adapters were bound to control cDNA (cDNA prepared from rat liver before hepatectomy) and mixed at a ratio of 10: 3: 1.
- CDNA prepared from rat liver at 1, 6, 24, 48, and 7 days after hepatectomy was bound to the remaining three adapters.
- the 3 'fragment of double-stranded cDNA is recovered using streptavidin-coated beads, and competitive RT-PCR is performed using a primer having a sequence common to each adapter.
- This PCR product was analyzed by ABI PRISM 3700 DNA Analyzer. This device can separate fragments by their length by capillary electrophoresis, and can detect the fluorescence intensity in proportion to the expression level.
- a calibration curve was created from the fluorescence intensity of the PCR product obtained from the control, and this was used to calculate the gene expression change in the resected liver to be measured.
- the base sequence of the adapter used is shown below.
- Table 1 shows the names of restriction enzymes used for those whose expression variation was examined by ATAC-PCR using restriction enzymes other than Mbol.
- the adapter sequence used had a different terminal sequence from that in the case of using Mbol.
- Figure 1 shows the arrangement of the different parts (in bold). 5> Application of Gene Panel to Screening for Candidates for Promoting Liver Regeneration
- L-alanine is known to have a liver regeneration promoting effect (Maezono K et.a
- liver was excised, weighed, cryopreserved, and subjected to mRNA expression measurement by ATAC-PCR. Liver specimens were prepared and liver PCNA (proliferating cell nuclear antigen) levels were measured.
- PCNA proliferating cell nuclear antigen
- the gene expression in the rat liver of each group was measured by ATAC-PCR.
- the method for preparing RNA and the method for ATAC-PCR are as described above.
- ATAC-PCR was measured using 117 genes that can be measured by ATAC-PCR using the restriction enzyme Mbol from the genes in the gene panel (Nos. 12, 49, 52, 55, 58, 59, 61, 69 in Table 1). , 73, 77, 83, 90, 93, 101, 102, 108, 130, 134, 135, 136).
- rat liver to which L-alanine was administered was stained with an anti-PCNA antibody (antibody to Proliferating Cell Nuclear Antigen (PCNA), a replication factor that promotes the activity of DNA polymerase ⁇ 5), and the PCNA Labeling Index was determined.
- PCNA Protein to Proliferating Cell Nuclear Antigen
- Table 2 shows the measurement results of the PCNA Labeling Index.
- the administration of L-alanine increased the PCNA Labeling Index in the liver compared to non-administered liver (Table 2).
- a la + indicates a group administered with L-alanine
- Ala- indicates a group without L-alanine. In other words, the effect of promoting L-arabin administration on hepatocyte proliferation was observed.
- Group 1 The gene expression in Groups 1 and 2 was compared by measuring the expression of the genes in the gene panel by ATAC-PCR. Expression was calculated from the relative value of the second group to the first group (Al a + / Al a- in Table 3). As a result, seven types were found to have a three-fold or more difference in expression between L-alanine administration and non-administration (Table 3). Table 3
- RNA was purified from the remaining liver (regenerated liver) at 0, 1, 6, 24, 48, and 168 hours after partial hepatectomy in rats. Changes in the expression levels of various genes were examined using the Taqman PCR (SYBR Green) method.
- Primers used for Taqman PCR were obtained from the external database Primer3. (http://www-genome.wi.mit.edu/cgi-bin/priier/priier3_www.cgi). Table 6 shows the name of each gene, its Unigene No., and the nucleotide sequence of the primer. Note that only genes whose expression was found to vary as a result of analysis by Taqman PCR (SYBR Green) are described.
- Taqman PCR was performed by the SYBR Green method (Schmittgen TD. Etal., Analytical Biochem. 285, 194-204, 2000). Specifically, the reaction was performed as follows. Reaction solutions having the compositions shown in Table 5 were mixed in a PCR tube for Taqman, and a PCR reaction was performed using ABI7700 Prism Sequence Detector (ABI). The reaction conditions were as follows. Reaction conditions: 50 ° C 2 minutes ⁇ 95 10 minutes— (95 ° C 15 seconds ⁇ 60 ° C 1 minute) 40 cycles. Table 5 Composition of PCR reaction solution (per tube) template cMA (equivalent to 2.5 ng of total RNA) 0.1 xl
- Dissection was performed 24 hours after partial hepatectomy. After exsanguination and sacrifice under anesthesia, the liver was excised, weighed, cryopreserved, and subjected to mRNA expression measurement by Taqman PCR (SYBR Green) method.
- Total RNA was purified in the same manner as in Example 1 from the remaining liver of 70% partially hepatectomized rats in the L-alanine administration group (group 1) and the control group (group 2).
- Primers used for Taqman PCR were designed using the external database Primer3 (hi tp: //www-genome.wi.mit.edu/cgi-bin/primer/primer3_ww.cgi) .
- Table 7 shows the name of each gene, its Unigene No., and the nucleotide sequence of the primer. Note that only genes whose expression was found to vary as a result of analysis by Taqman PCR (SYBR Green) are described.
- Taqman PCR (SYBR Green) Taqman PCR (SYBR Green) was performed in the same manner as in Example 2.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2002576665A JPWO2002077222A1 (ja) | 2001-03-13 | 2002-03-13 | 肝再生に関与する遺伝子パネル |
| US10/469,938 US20060105329A1 (en) | 2001-03-13 | 2002-03-13 | Gene panel participating in liver regeneration |
| EP02705141A EP1375657A4 (en) | 2001-03-13 | 2002-03-13 | GENE ASSEMBLY PARTICIPATING IN LIVER REGENERATION |
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| EP (1) | EP1375657A4 (ja) |
| JP (1) | JPWO2002077222A1 (ja) |
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| DE102006019480A1 (de) * | 2006-04-26 | 2007-10-31 | Sirs-Lab Gmbh | Verfahren zur in-vitro Überwachung postoperativer Veränderungen nach Lebertransplantation |
| CN106754950A (zh) * | 2017-02-21 | 2017-05-31 | 河南师范大学 | 一种调节肝再生的c9orf116基因及其siRNA干扰靶点和应用 |
| CN112147336B (zh) * | 2019-09-18 | 2023-04-28 | 首都医科大学附属北京佑安医院 | 一种检测和评估肝再生的标志物及其用途 |
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| JPH05229940A (ja) * | 1992-02-26 | 1993-09-07 | Ajinomoto Co Inc | 肝再生促進剤 |
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| JPH05229940A (ja) * | 1992-02-26 | 1993-09-07 | Ajinomoto Co Inc | 肝再生促進剤 |
Non-Patent Citations (7)
| Title |
|---|
| BENNETT, L.M. ET AL.: "Strain-dependent differences in DNA synthesis and gene expression in the regenerating livers of CB57BL/6J and C3H/HeJ mice", MOL CARCINOG., vol. 14, no. 1, September 1995 (1995-09-01), pages 46 - 52, XP002953505 * |
| KAR, S. ET AL.: "Differential display and cloning for messenger RNAs from the late phase of rat liver regeneration", BIOCHEM. BIOPHYS. RES. COMMUN., vol. 212, no. 1, 6 July 1995 (1995-07-06), pages 21 - 26, XP002953503 * |
| KATO, K.: "Adaptor-tagged competitive PCR: a novel method for measuring relative gene expression", NUCLEIC ACIDS RES., vol. 25, no. 22, 15 November 1997 (1997-11-15), pages 4694 - 4696, XP002900285 * |
| RININGER, J.A. ET AL.: "Time course comparison of cell-cycle protein expression following partial hepatectomy and WY14, 643-induced hepatic cell proliferation in F344 rats", CARCINOGENESIS, vol. 18, no. 5, May 1997 (1997-05-01), pages 935 - 941, XP002953504 * |
| SCHMITTGEN, T.D. ET AL.: "Quantitative reverse transcription-polymerase chain reaction to study mRNA decay: comparison of endpoint and real-time methods", ANAL BIOCHEM., vol. 285, no. 2, 15 October 2000 (2000-10-15), pages 194 - 204, XP002953506 * |
| See also references of EP1375657A4 * |
| XU, W. ET AL.: "Identification and characterization of differ entially expressed genes in the early response phase during liver regeneration", BIOCHEM. BIOPHYS. RES. COMMUN., vol. 278, no. 2, 19 November 2000 (2000-11-19), pages 318 - 325, XP002953502 * |
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| EP1375657A1 (en) | 2004-01-02 |
| CN1509331A (zh) | 2004-06-30 |
| JPWO2002077222A1 (ja) | 2004-07-15 |
| EP1375657A4 (en) | 2005-04-20 |
| US20060105329A1 (en) | 2006-05-18 |
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