PDGFR单克隆抗体的制备和鉴定

目的 通过谷胱甘肽转硫酶偶联的血小板衍生因子受体氮端的融合蛋白(GST-PDGFR-N)制备有生物活性的单克隆抗体.方法 用GST-PDGFR-N融合蛋白作为免疫原,通过杂交瘤技术制备抗PDGFR的单克隆抗体,用间接ELISA、Western blot、免疫组化等方法对抗体的抗原结合特性进行鉴定.结果 获得两株能稳定分泌抗PDGFR单克隆抗体的细胞3B12F5和3C6H7C11,亚类鉴定两种单抗均为IgG1.间接ELISA法测定两株细胞腹水抗体的效价分别为1:102400为和1:25600.Western blot法显示PDGFR单克隆抗体特异性地识别免疫原和胶质瘤细胞株U251中的抗原成分.细胞免疫组化显示此单抗可以特异的识别胶质瘤细胞株U251和膀胱癌细胞株BIU87中表达的PDGFR抗原.结论 成功制备PDGFR单克隆抗体,为研究PDGFR的表达情况和临床检测提供了一个有用的工具.

The Preparation and Identification on Monoclonal Antibody to Platelet-derived Growth Factor Receptor

OBJECTIVE: Through genetic engineering to produce the fusion protein of glutathione S-transferase (GST) linked to amino-terminal end of platelet-derived growth factor receptor (PDGFR), and to prepare the bioactive monoclonal antibody. METHODS: With taking GST-PDGFR-N fusion protein as immunogen, the anti-PDGFR monoclonal antibody was produced by using the hybridoma technique, of which then the antigen binding characteristic was identified by indirect enzyme-linked immunosorbent assay (ELISA), Western blot and immunohistochemistry methods. RESULTS: Two cell strains of hybridoma were obtained and named as 3B12F5 and 3C6H7C11 which secreted the anti-PDGFR monoclonal antibody, of which the class and subtype identification demonstrated both strains to produce all type of IgG1. The indirect ELISA result showed that the titers of ascites fluid which two hybridoma induced were 1 : 102400 and 1 : 25600. Western blot demonstrated that the two antibodies could recognize specifically the immunogen on PDGFR and U251 cell line. The cell immunohistochemistry proved that the antibody could recognize the expressed PDGFR antigens of neurogliocytoma U251 and bladder carcinoma BIU87 cell lines. CONCLUSION: We prepare successfully the PDGFR monoclonal antibody and provide a useful tool for researching on the PDGFR expression and clinical detection.