WO2006068249A1 - 肥満の検査方法及び肥満の予防又は治療薬のスクリーニング方法 - Google Patents
肥満の検査方法及び肥満の予防又は治療薬のスクリーニング方法 Download PDFInfo
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- WO2006068249A1 WO2006068249A1 PCT/JP2005/023674 JP2005023674W WO2006068249A1 WO 2006068249 A1 WO2006068249 A1 WO 2006068249A1 JP 2005023674 W JP2005023674 W JP 2005023674W WO 2006068249 A1 WO2006068249 A1 WO 2006068249A1
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6883—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/156—Polymorphic or mutational markers
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/158—Expression markers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2800/00—Detection or diagnosis of diseases
- G01N2800/04—Endocrine or metabolic disorders
Definitions
- Patent application title Obesity Inspection Method and Obesity Prevention or Treatment Screening Method
- the present invention relates to a method for screening for obesity and a method for screening a medicament for preventing or treating obesity.
- Non-patent Document 1 Since obesity can lead to diseases such as diabetes, it is important to predict the onset of obesity and improve dietary habits as soon as possible.
- Non-patent Document 2 Many obesity-related genes have been reported (Non-patent Document 2). However, the relationship between these genes and obesity is not always clear, and development of a gene analysis method capable of predicting the onset of obesity more accurately has been sought.
- Dalanin is a protein that is localized in endocrine cells (Non-patent Document 4) such as spleen ⁇ cells (insulin-secreting cells) and nerve cells, and forms secretory granules containing peptide hormones and bioactive amines.
- endocrine cells such as spleen ⁇ cells (insulin-secreting cells) and nerve cells
- secretogranin IIKSCG3 secretogranin II
- Non-patent literature l Kopelman, P.G.Nature 404, 635-643 (2000)
- Non-Patent Document 2 Snyder, E.E. et al.Obes. Res. 12, 369-439 (2004)
- Non-Patent Document 3 Ottiger, H.P., Battenberg, E.F., Tsou, A.P., Bloom, F.E. & Sutcliffe,
- Non-Patent Document 4 Hosaka M et al. Mol Biol Cell. 13, 3388-3399 (2002)
- the present invention relates to the development and progression of obesity, as well as abnormal glucose tolerance associated with obesity, low insulin secretion.
- the purpose of this study is to provide a test method for accurately predicting the onset of complications such as diabetes.
- Another object of the present invention is to provide a method for screening a preventive or therapeutic agent for obesity and its complications.
- the inventors of the present invention have made extensive studies in order to solve the above problems. As a result, we found that a single nucleotide polymorphism of the SCG3 gene is related to obesity. Furthermore, it was found that if a compound that regulates the expression of the SCG3 gene is screened, a prophylactic / therapeutic agent for obesity can be obtained, and the present invention has been completed.
- the present invention is as follows.
- the single nucleotide polymorphism is one or more polymorphisms selected from polymorphisms in the base corresponding to the 61st base of the base numbers of SEQ ID NOs:! To 12, respectively (1) Or method (2).
- a probe for obesity testing having a base IJ of 10 or more nucleotides containing the base at position 61 in the nucleotide sequence of any one of SEQ ID NOs: 1 to 12 or a complementary sequence thereof.
- a primer for testing obesity capable of amplifying a DNA fragment containing the base at position 61 in any one of the base sequences of SEQ ID NOs: 1 to 12.
- (6) a step of adding a drug candidate substance to a cell expressing a secretogranin 3 gene or a reporter gene linked to a secretogranin 3 gene promoter, a step of measuring the expression level of the secretoniesin 3 gene or the reporter gene, And a method for screening a prophylactic or therapeutic agent for obesity, comprising a step of selecting a substance that changes the expression level.
- FIG. 1 is a diagram showing the positions of SNPs on the SCG3 gene. # Indicates landmark SNP, * indicates insertion / deletion polymorphism, and ⁇ indicates SNPs analyzed in the primary screening.
- FIG. 2A The transcriptional activation ability of each SNP-containing fragment (one) was analyzed in SH-SY5Y cells. The figure which shows the result analyzed. The mouth shows the results when using the major alleles and the country uses the fragments corresponding to the minor alleles. Luciferase activity was expressed as mean soil SE, and the significant difference was subjected to unpaired t test.
- FIG. 3A Diagram showing the results of analyzing the transcriptional activation ability of each SNP-containing fragment (1) in BE (2) -C cells.
- the mouth shows the results when using fragments corresponding to major alleles, and the country uses minor alleles.
- the luciferase activity was expressed as mean soil SE, and the significant difference was subjected to unpaired t_test.
- FIG. 4A is a diagram showing the results of analyzing the transcriptional activation ability of each SNP-containing fragment (one) in HIT-T15 cells.
- the mouth shows the results when using the major alleles and the country uses the fragments corresponding to the minor alleles.
- Luciferase activity was expressed as mean soil SE, and the significant difference was subjected to unpaired t test.
- FIG. 4B is a diagram showing the results of analyzing the transcriptional activation ability of each SNP-containing fragment (four linked fragments) in HIT-T15 cells.
- the mouth shows the results when using the major allele, and the country shows the results when using fragments corresponding to the minor allele.
- Luciferase activity was expressed as mean value soil SE, and the significant difference was unpaired t-test.
- FIG. 5A is a diagram (photograph) showing the results of a gel shift experiment using an oligonucleotide containing SNP — 2 (5 ′ Flanking -1203).
- C, G, and A indicate the oligonucleotide corresponding to each polymorphism. Arrows indicate specific binding.
- FIG. 5B is a diagram (photograph) showing the results of a gel shift experiment using an oligonucleotide containing SNP — 9 (Intron 1 +190).
- C, G and A indicate the oligonucleotide corresponding to each polymorphism. The Arrows indicate specific binding.
- FIG. 6 is a diagram (photograph) showing the result of electron microscope observation of BE (2) -C cells transfected with a plasmid containing the SCG3 gene or a control plasmid.
- A is a BE (2) -C cell transformed with a control plasmid
- B is an electron microscopic image of BE (2) _C cell transcribed with a plasmid containing the SCG3 gene.
- Arrows ( ⁇ ) indicate secretory granules.
- C is an image showing the staining result of staining BE (2) -C cells transfected with a plasmid containing the SCG3 gene with an anti-SCG3 antibody. Arrows (black triangles) indicate secretory condyles stained with SCG antibody.
- the scale bar indicates 500 nm.
- the test method of the present invention is a method for analyzing obesity-related single nucleotide polymo ⁇ hism (SNP) on the secretogranin III (SCG3) gene and analyzing the obesity based on the analysis. It is.
- Obesity refers to, for example, a state in which BMKBody Mass Index (weight kg) / (height m) 2 ) is 25 or more.
- “test” includes a test for predicting whether obesity will occur in the future and a test for predicting whether the degree of obesity will deteriorate. It also includes testing for the onset of complications such as decreased insulin secretion, impaired glucose tolerance, and diabetes in obesity. It also includes screening for whether obesity is due to subcutaneous fat accumulation.
- the SCG3 gene is preferably a human SCG3 gene, for example, a gene having a sequence registered in GenBank Accession No. AC020892.
- the gene is not limited to the gene of the above sequence because there is a possibility of substitution or deletion in one or more bases depending on the race or the like.
- the single nucleotide polymorphism site of the SCG3 gene related to obesity is not particularly limited.
- SNP-1 means the polymorphism of adenine (A) Z guanine (G) in the 144248th base of GenBank Accession No. AC020892, and the probability of becoming obese when this basic force is SA Is expensive.
- SNP-1 has a high probability of becoming obese in the order of AA>AG> GG.
- SNP location 5 'Flanking indicates the position relative to the transfer start point.
- SNP-1 is a SNP at a base 1492 bases upstream from the transcription start point in the 5 ′ adjacent region.
- dbSNP indicates the registration number of the dbSNP database (www.ncbi.nlm.nih.gov/projects/SNP/) of the National Center for Biotechnology Information.
- An SNP with this column blank is a new SNP that is not registered in the dbSNP database.
- the base on the left side is likely to become obese (for example, in the case of SNP-2, A / C is likely to become obese SNP-5 , G / C is likely to become obese if G)).
- SNP-1, SNP-2, SNP-5, SNP-9, SNP-11, SNP-12, SNP-16, SNP-17, SNP-20, SNP-26, SNP-27 or SNP-29 The sequences of a total length of 121 bp including the SNP base and the region of 60 bp before and after that are shown in SEQ ID NOs: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12, respectively. Each 61st base has a polymorphism.
- Bases corresponding to these bases are analyzed in the present invention.
- “equivalent” Means the corresponding base in the region having the above sequence on the human SCG3 gene. Even if the above sequence slightly changes at a position other than SNP due to differences in race, etc., the corresponding base in that region is analyzed. Including.
- the SCG3 gene sequence may be analyzed for the sense strand or the antisense strand.
- the sample used for the analysis of the single nucleotide polymorphism of the SCG3 gene is not particularly limited as long as it is a sample containing chromosomal DNA, but for example, a sample of body fluid such as blood and urine, cells, hair, etc. Examples include body hair.
- body fluid such as blood and urine, cells, hair, etc. Examples include body hair.
- Ability to directly use these samples for analysis of single nucleotide polymorphisms It is preferable to isolate chromosomal DNA from these samples by a conventional method and analyze them.
- Single nucleotide polymorphism analysis of the SCG3 gene can be carried out by a usual single nucleotide polymorphism analysis method. Examples include, but are not limited to, sequence analysis, PCR, hybridization, and the like.
- the sequence can be performed by an ordinary method. Specifically, a sequence reaction was performed using a primer set at the position of several tens of bases on the 5 'side of the base showing the polymorphism, and based on the analysis result, what kind of base is the corresponding position Can be determined. In addition, when performing a sequence, it is preferable to amplify a fragment containing a polymorphism in advance by PCR or the like.
- Analysis can also be performed by examining the presence or absence of amplification by PCR.
- a primer having a sequence corresponding to a region containing a base showing a polymorphism and corresponding to each polymorphism is prepared.
- PCR can be performed using each primer, and the type of polymorphism can be determined by the presence or absence of amplification products.
- a base showing a polymorphism when included in a restriction enzyme recognition sequence, it can be analyzed by the presence or absence of cleavage by a restriction enzyme (RFLP method).
- RFLP method restriction enzyme
- the DNA sample is first cleaved with a restriction enzyme.
- the DNA fragments can then be separated and the power of which type of polymorphism can be determined by the size of the detected DNA fragment.
- the present invention also provides detection reagents such as primers and probes for detecting obesity.
- probes include probes that include the polymorphic site in the SCG3 gene and can determine the type of base at the polymorphic site based on the presence or absence of hybridization. It is. Specifically, a probe having a length of 10 bases or more having a sequence containing the 61st base of any one of SEQ ID NOs:! To 12 or a complementary sequence thereof can be mentioned. The length of the probe is more preferably 15 to 35 bases.
- the primer examples include a primer that can be used for PCR for amplifying the polymorphic site in the SCG3 gene, or a primer that can be used for sequence analysis (sequencing) of the polymorphic site. .
- a primer that can amplify or sequence the region containing the 61st base of any one of SEQ ID NOS: 1 to 12 can be mentioned.
- the length of such a primer is preferably 10 to 50 bases, more preferably 15 to 35 bases.
- a primer having a 5 ′ region of the base preferably 30 to 100 bases upstream, or a 3 ′ region of the base, preferably 30 to 100
- examples include primers having a sequence complementary to the region downstream of the base.
- Primers used to determine polymorphism based on the presence or absence of amplification by PCR have a sequence containing the above base, a primer containing the above base on the 3 ′ side, or a complementary sequence of the sequence containing the above base.
- Examples include primers containing a base complementary to the above 3 'side.
- the test reagent of the present invention may contain, in addition to these primers and probes, a polymerase polymerase for PCR, a hybridization reagent, and the like. Primers can also be used to predict whether obese patients cause decreased insulin secretion, impaired glucose tolerance, or diabetes. ⁇ 3> Screening method
- SCG3 is localized in the arcuate nucleus, paraventricular nucleus, and lateral hypothalamus, which are known to be deeply involved in appetite regulation. It was strongly suggested that it is involved in the secretion of peptide hormones involved in the regulation of appetite. From the above, a candidate substance that can be a prophylactic or therapeutic agent for obesity can be obtained by screening a substance that regulates the expression of the SCG3 gene. It also prevents or treats complications such as impaired glucose tolerance, decreased insulin secretion, and diabetes associated with fattening. Candidate substances that can be used as therapeutics can also be obtained.
- the screening method of the present invention comprises the step of adding a drug candidate substance to a cell expressing a reporter gene linked to the SCG3 gene or the SCG3 gene promoter, and measuring the expression level of the secretogranin 3 gene or the reporter gene.
- a method for screening a prophylactic or therapeutic agent for obesity or its complications comprising the step of: and selecting a substance that changes the expression level.
- SH-SY5Y cells A TCC CRL-2266
- BE (2) -C cells ATCC CRL-2268
- HIT-T15 cells are preferred as cells expressing the SCG3 gene. (ATCC CRL-1 777) can be used.
- the SCG3 gene promoter is preferably a region containing at least 1.5 kbp upstream of the transcription start point of the gene. . Further, a part of the promoter may be used, for example, a short region of 10 to 50 bp including SNP may be used.
- the SNP base is preferably a promoter with a low risk of obesity and a base containing the other base (for example, C for SNP-2 or G for SNP-9). Ms.
- reporter gene examples include a luciferase gene, a GFP gene, and a chloramphenicol acetyltransferase gene. These reporter genes are linked to the SCG3 gene promoter, incorporated into a plasmid that is used to introduce the gene into mammalian cells, and tranfected into cells by conventional methods such as lipofection.
- a drug candidate substance is added to the above-described nerve cell or cell into which the reporter gene has been introduced, and the expression level of the SCG3 gene or reporter gene is measured.
- the drug candidate substance is not particularly limited.
- it may be a low molecular weight synthetic compound or a compound contained in a natural product. It can also be a peptide.
- Individual test substances may be used for screening, but one compound library containing these substances may be used.
- a candidate substance for an obesity drug can be obtained by selecting a candidate substance that changes the expression level of the SCG3 gene or reporter gene.
- the “change” includes increasing and decreasing the expression level of the SCG3 gene as compared with the case where the drug candidate substance is not added.
- the expression level of SCG3 gene can be measured by methods such as RT_PCR, quantitative PCR, Northern blot, ELISA, Western blotting, In situ hybridization, immunohistochemical staining.
- RT_PCR quantitative PCR
- Northern blot Northern blot
- ELISA Western blotting
- Western blotting Western blotting
- immunohistochemical staining immunohistochemical staining
- a substance in which the expression level of the SCG3 gene or reporter gene is changed can be selected as a candidate substance for an anti-obesity drug.
- Obesity patients selected from outpatients at university hospitals such as Tokyo Medical University and Osaka University, and hospitals such as Toyonaka Hospital and Otemae Hospital were analyzed. Patients with secondary and genetic obesity were excluded from the analysis.
- Control subjects were arbitrarily selected from volunteers with normal weight who were examined at Tokyo Medical University.
- chromosomal DNA was prepared from a blood sample of each subject by a normal procedure.
- SNP Flanking-1492 AC020892.7_144248 or rs3764220; IMS-JSTl 18085
- SNP Flanking-1492 AC020892.7_144248 or rs3764220; IMS-JSTl 18085
- p in the comparison of major allele (A) and minor allele (G)
- the power of 0.02 is shown (see the upper part of Tables 2 and 3).
- the dienotype distribution and allele frequency were analyzed by chi-square test or Fisher's exact test, and the HWE test in Table 2 is based on the Hardy-Weinberg equilibrium test (Nealsen, DM, Ehm, MG & Weir, BS Am. J. Hum.Gent. 63, 153-1540 (1998)).
- oligonucleotide For each SNP, a double-stranded oligonucleotide corresponding to a 20 bp region containing major alleles or minor alleles, or an S4 concatenation of them, is introduced with an Nhel site on the 5 'side and an Xbal site on the 3' side. Each was synthesized.
- a reporter plasmid was constructed by incorporating the above oligonucleotide into a pGL3_Promoter Vector (Promega) containing a luciferase gene linked to the SV40 promoter. It was confirmed by sequencing that the oligonucleotide was incorporated.
- This reporter plasmid is transferred to SH-SY5Y cells or BE (2) _C neuroblastoma cells using ribohetamine 2000 (Invitrogen) together with the phRL-TK vector (Promega) as an internal standard for transfection efficiency. Excuse me. Cells were collected 24 hours later, and luciferase activity was measured using Dua Luciferase Reporter Assay System (Promega).
- SH-SY5Y cells and BE (2) -C cells were purchased from ATCC (American Tissue Culture Collection). These were prepared using 7 mM advanced Dulbeccos modined hagles medium (Invitrogen) supplemented with 2 mM glutamine, 5% urine fetal serum, 100 U / ml penicillin and 100 ⁇ g / ml strechmann.
- HIT-T15 cells which are the most common spleen cell lines.
- the ( Figure 4) As a result, HIT-T15 cells had weaker transcriptional activity than the force SH-SY5Y cells, which gave similar results. This was thought to be due to the difference between human and hamster species.
- a 33 bp double-stranded oligonucleotide containing each SNP was labeled with digoxigenin-11-ddUTP using a digoxigenin gel shift kit.
- Nuclear extracts of SH-SY5Y cells or BE (2) -C cells were also prepared using NE-PER extraction reagent (Pierce) and incubated with the digoxigenin_ll_ddUTP-labeled double-stranded oligonucleotide.
- the nuclear extract was preincubated with a 100-fold excess of unlabeled oligonucleotide over the labeled oligonucleotide and then incubated with the labeled oligonucleotide.
- Protein-DNA complexes were separated on a 5% non-denaturing polyacrylamide gel in 0.5X Tris monoborate-one EDTA buffer. The gel was transferred to a nylon membrane and the signal was detected using a chemiluminescence detection system (Roche) according to the manufacturer's protocol.
- mice Male mice (B57BL / 6, 8 weeks old) were purchased from Sankyo Lab Service. Mice were fixed by refluxing using Tissue Fixative (Genostaff) and embedded in paraffin. The tissue piece (4 ⁇ m) was deparaffinized and the RNA probe was hybridized.
- RNA probe As a probe, a 441 bp DNA fragment corresponding to positions 943 to 1383 of mouse cDNA (GenBank Accession No. NM_009130) is incorporated into the pGEM-T-Easy vector (Promega) to generate sense and antisense RNA probes. This was prepared by labeling with DIG RNA labeling Mitsuta (Roche).
- Digoxigenin-labeled RNA probe is hybridized to the above tissue piece at 42 ° C for 18 hours. Let The bound labeled substance was detected using alkaline phosphatase labeled DIG antibody and NBT-BCIP which is a substrate for alkaline phosphatase.
- ARC arcuate nucleus
- PVN paraventricular nucleus
- LHA lateral hypothalamic area
- Tissue sections were prepared from olexin B (1: 500 che micon), MCri melanm-concentrating hormone (1: 500 Phenix Pharmaceuticals), NPY (neuro peptide Y), ⁇ : 200 Chemicon), BDNF ( Brain_derived neurotrophic fact or) (1: 100 Santa Cruz) or POMC proopiomelanocortin) (1: 500 Phenix Pharm aceuticals) And incubated at 4 ° C.
- SCG3 protein was detected mainly in ARC, LHA and PVN.
- ARC is a site involved in appetite regulation, and there are NPY and POMC neurons. As a result of double immunostaining, it was confirmed that SCG3 protein was localized at the same site as NPY and POMC in ARC.
- LHA is a site where olexin and MCH involved in appetite suppression exist.
- SCG3 protein was localized in the same site as olexin B and MCH in LHA.
- Immunostaining was performed using nerve cells to examine the intracellular localization of SCG3 protein.
- the SCG3 gene coding region was amplified by RT-PCR using a 5 'primer having a Pstl site, a 3' primer having a Sail site, and a hypothalamic cDNA as a saddle type.
- PCR product was digested with a restriction enzyme and then incorporated into a pBI vector (Clonetech) digested with the same enzyme (pBI-SCG3).
- pBI-SCG3 pBI vector
- genes encoding prepro olexin, PMC, proNPY, and proMCH were amplified by RT-PCR using a 5 ′ primer having an Mlul site and a 3 ′ primer having an EcoRV site.
- Amplification products were extinguished with Mlul and EcoRV and incorporated into pBI-SCG3 digested with the same enzymes (pBI-SCG3-preproorexin, pBI-SCG3_POMC, pBI_SCG3-proNPY, pBI-SCG3-proMCH) 0
- pBI-SCG3-preproorexin pBI_SCG3_POMC, pB ⁇ SCG3_proNPY, and pBI-SCG3-pro MCH are added to the SH-SY5Y cells or BE (2) _C cells containing the pTet-Off vector (Clonetech), respectively. Invitrogen).
- pTet-Off vector Clonetech
- Invitrogen For immune cell staining, after washing with PBS, cells were fixed with 4% paraformaldehyde for 15 minutes. The cells were further treated with 0.5% Triton X-100, washed with PBS, blocked with 1% BSA for 2 hours at room temperature, and incubated at 4 ° C.
- the antibody was reacted with an antibody against any of olexin, POMC, NPY or MCH and SCG3 antibody, and then reacted with a fluorescently labeled secondary antibody.
- the cells were observed using a confocal laser scanning microscope.
- SCG3 forms a granular structure and has the same intracellular localization as olexin, MCH, NPY and POMC.
- the localization of SCG3 was examined by immunoelectron microscopic analysis in BE (2) -C cells transfected with a plasmid containing the SCG3 gene or a control plasmid.
- a 5 'primer with a Kozak sequence and Notl recognition sequence in front of the start codon was amplified from the cDNA of the hypothalamus using a 3 'primer with an EcoRI recognition sequence added after the stop codon.
- the amplified product was digested with Notl and EcoRI, and then inserted between the Notl site and EcoRI site of pcDNA3.1 (_) vector (Invitrogen).
- the obtained pcDNA-SCG3 was transfected into BE (2) -C cells using FuGENE6 Transfection Reagent (Roche). After 48 hours, the cells were washed with PBS, treated with 0.05% trypsin (0.53 mM EDTA Gnvitrogen), detached from the dish, and centrifuged to collect the cells.
- the collected cells were fixed with a force codylate buffer (pH 7.2) containing 2.5% glutaraldehyde, then treated with 2% osmium tetroxide, dehydrated, and then encapsulated in an epoxy resin. Ultrathin slices were stained with uranyl acetate and lead citrate.
- the collected cells were fixed with force codylate buffer (pH 7.2) containing 4% paraformaldehyde, dehydrated, and packaged in LR-WHITE (registered trademark) resin.
- Ultrathin slices were treated with anti-SCG3 goat polyclonal antibody (Santa Cruze; diluted 200-fold) and then with 5 nm gold labeled anti-goat IgG rabbit antibody (Amersham Bioscience).
- the screening method of the present invention can accurately predict the risk and progression of obesity, obesity can be prevented or progress can be suppressed. Further, according to the screening method of the present invention, a novel preventive / therapeutic agent for obesity can be obtained.
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| JP2006549068A JP5083800B2 (ja) | 2004-12-24 | 2005-12-22 | 肥満の検査方法及び肥満の予防又は治療薬のスクリーニング方法 |
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Non-Patent Citations (3)
| Title |
|---|
| HOSAKA M ET AL: "Identification of a chromogranin A domain that mediates binding to secretogranin III and targeting to secretory granules in pituitary cells and pancreatic beta-cells.", MOL BIOL CELL., vol. 13, no. 10, 2002, pages 3388 - 3399, XP002351524 * |
| KINGSLEY D M ET AL: "Genetic ablation of a mouse gene expressed specifically in brain.", EMBO J., vol. 9, no. 2, 1990, pages 395 - 399, XP002995239 * |
| OTTIGER H P ET AL: "1B1075: a brain- and pituitary-specific mRNA that encodes a novel chromogranin/secretogranin-like component of intracellular vesicles.", J NEUROSCI., vol. 10, no. 9, 1990, pages 3135 - 3147, XP002995238 * |
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| JPWO2006068249A1 (ja) | 2008-06-12 |
| JP5083800B2 (ja) | 2012-11-28 |
| WO2006068249A8 (ja) | 2006-09-28 |
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