抗人天冬酰胺合成酶單克隆抗體的制備與鑒定
[Abstract]:Asparagine synthase is a member of aminotransferase family, which can catalyze the synthesis of asparagine (ASN), and provide raw materials for protein synthesis. Compared with normal cells, the enzyme activity of some kinds of malignant lymphocytes is very low, and it can not synthesize enough asparagine, which depends on the asparagine in the cell environment. In this study, the prokaryotic expression plasmid pMS-ASNS was used to express MS2-ASNS fusion protein, and the monoclonal antibody against human asparagine synthase was prepared by cell fusion and hybridoma techniques. The following results were obtained: 1. The fusion protein MS2-ASNSwas obtained by electroeluting the fusion protein by SDS-PAGE electrophoresis. The molecular weight of MS2-ASNSwas about 55 kDa, which was in agreement with the theoretical value. BALB/C mice were immunized with purified fusion protein. Spleen cells were fused with 50% PEG 3350 and SP2/0 cells. The fusion efficiency was 88 and the positive rate was 2.3%. Three hybridoma cell lines secreting monoclonal antibodies against human asparagine synthase were screened four times by ELISA double screen method with fusion protein MS2-ASNS and MS2-PAI, respectively. The antibody secretion of D10-9 F4-15 and F4-16.3 cell lines was stable after in vitro passage and cryopreservation and resuscitation. The subclasses of monoclonal antibody were IgG1, IgG2a and IgG2a.3, respectively. The specificity and titer of antibody were identified by ELISA method. The results showed that the antibody prepared by D10-9 had good specificity, and the titer of antibody secreted by cell line D10-9 was 1:2 脳 102F4-15 and F4-16, and the antibody secreted by F4-16 reached 1:5 脳 105.The antibody was identified by Western-blot method with high affinity in K562 and Hela cell lines. IHC technique was used to detect the cytoplasmic expression of natural ASNS in hepatocellular carcinoma cell line SMMC-7721 BEL-7402 HepG2, gastric cancer cell line SGC-7901hSGC-823, lung cancer, cervical cancer and thyroid carcinoma. In this study, monoclonal antibodies against ASNS were prepared, and the expression of ASNS in tumor cells was preliminarily detected, which laid a foundation for further study of the expression of ASNS in midline nasal / nasal NK/T cell lymphoma.
【學位授予單位】:西北農(nóng)林科技大學
【學位級別】:碩士
【學位授予年份】:2008
【分類號】:R392
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