新的T細(xì)胞活化標(biāo)志ZCH-2B8a抗原的分子特性及功能研究
[Abstract]:Purpose: The ZCH-2B8a monoclonal antibody is prepared by using the classical hybridoma technique in the laboratory, and it is considered to be a new differentiation antigen or a new CD molecule of the hematopoietic cell membrane which has not been recognized in the world after being identified by the HLDA8 cooperative group. The previous study indicates that the antigen (Ag) may be a living cell. It is therefore necessary to further study the Ag to define the protein sequence and its expression profile, whether it is a new activating molecule and its function, and to develop its potential value Methods: This study mainly includes the following four parts: (1) Preparation of 2B8a FITC direct-labeled antibody: purifying the 2B8a antibody from ascitic fluid by using the SPASephron affinity chromatography, and identifying the purity and molecular weight of the antibody by means of SDS-PAGE; and using the modified Marshall method to prepare 2. B8a FITC direct-labeled antibody And the distribution of 2B8a Ag was detected by flow cytometry. The distribution of 2B8a Ag in peripheral tissues, normal peripheral blood, leukemia cells and cell lines was detected by flow cytometry. (3) The function of 2B8a Ag: The expression of 2B8a in peripheral blood of patients with aplastic anemia was detected by flow cytometry, and the expression of 2B8a Ag in peripheral blood of patients with aplastic anemia was detected. Correlations with other activation markers; the effect of 2B8a Ab on the secretion of cytokines in activated T cells by flow cytometry (CBA); the detection of the Ag epitope of Raji cells by the 2B8a antibody and the bone marrow Changes of the adhesion ability of the matrix cells; the ability of the 2B8a Ag-mediated antibody to be internalized by the enzyme-cutting of the papain and the flow cytometry;2 B8a Ab and Ag-specific by the complement-dependent cytotoxicity assay (CDC) The ability of binding and activating complement. (4) Identification of the 2B8a Ag protein: the Raji cell protein lysate was purified by the immunoprecipitation method, and the SDS-PAGE was detected by SDS-PAGE, and the Ag protein band on the gel was sent to the peptide mass fingerprint and the tandem mass spectrum analysis; and the Western blot method was used to identify 2. B8a The molecular weight of the Ag protein was determined by SDS-PAGE. The heavy chain and light chain molecular weight of the 2B8a antibody were 52 kDa and 9 kDa, respectively. The 2B8a direct standard method (2B8a FITC) and the m-standard method (2B8a + GAM-FITC) were positive for Raji cells. The reaction rates were 98.48% and 98.35%, respectively. The positive rate of reaction with Molt-3 cells was 9.35% and 10.80%, respectively. The expression of Ag in B-series acute lymphoblastic leukemia cells increased significantly compared with the control group. The expression of 2B8a Ag on activated T cells was different from that of CD69, CD25 and HLA-DR. The positive rate of Ag expression was up-regulated (AA: CD4 + T cell positive rate was 90.9). The rate of adhesion between Raji cells and bone marrow stromal cells (2 h,4 h,6 h, and 12 h) was 0.87, 1.02 respectively after the antigen epitope was closed by the 2B8a antibody and the adhesion of Raji cells to the bone marrow stromal cells (2 h,4 h,6 h and 12 h) was not reduced. 1.02 and 0.96 (both P> 0.05) and did not affect the level of secretion and activation of cytokines after T cell activation (PHA group and PHA + 2 B8a group IL-2 median value:425 pg/ ml v (s.442 pg/ ml, P = 0.465). 2 (1.5%). The B8a antibody can activate complement and mediate CDC to kill Raji cells (according to 0.1. mu.g of antibody:10. mu. l complement:5%10-4 cells, Raji cell death rate of 88.6% 7.9%), and Molt-3 cell group The cell lysate of Raji was purified by immunoprecipitation and purified by Western blot. the molecular weight of the Ag is confirmed to be about 50 kDa. The mass spectrum analysis fails to clearly obtain a unique and reliable protein sequence, It's in the table The results are as follows: (1) The study itself The 2B8a FITC fluorescent antibody has good sensitivity and specificity; (2) 2B8a Ag is in the lymph node, tonsil, liver and pancreas can be detected in peripheral blood, which is mainly distributed in activated T cells, B cells, monocytes, neutrophils, The cell membrane and the cell pulp were not expressed on the resting T cell membrane, but the expression was also strong in its cytoplasm; (3) 2B8a Ag was An early-stable T-cell activation marker; in regeneration Up-regulation of expression in immune-related diseases, such as anemia; (4) 2B8 a) Ag can mediate the rapid internalization of the antibody; (5) 2B8a Ab can activate complement and play a significant role in C (6) 2B8a Ag could not mediate the adhesion between cells;
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2009
【分類號(hào)】:R392
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