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- W2045221369 abstract "Previously we described a monoclonal antibody (mAb 12-15) that reacted with murine Fc receptor proteins (beta 1, beta 2 and alpha) and an undefined molecule of 37 kDa (beta 3) on certain types of cells. Here we present serological and biochemical evidence that the beta 3 chain is expressed on mouse thymocytes and that it is identical to the CD2 antigen. By immunofluorescence staining and cytofluorographic analysis greater than 95% of thymocytes were positive. Brightly staining cells coincided with cortisone-resistant thymocytes suggesting that mature thymocytes expressed higher levels of the antigen. Biosynthetic labeling of DBA/2 thymocytes with [35S]methionine showed that the size of the CD2 precursor molecule was 43 kDa which was processed to approximately 55-65 kDa in the mature molecule. mAb 12-15 was also reactive with the tunicamycin-treated form of the CD2 antigen suggesting that the cross-reactive epitope was of protein nature. Comparison of different mouse strains indicated that two molecular forms of CD2 exist. On BALB/c thymocytes, the relative mass of the native molecule was approximately 60-70 kDa (CD2.1) and slightly larger than in DBA/2 (CD2.2). Following endoglycosidase F treatment both proteins still showed a slight difference in electrophoretic mobility. Several inbred mouse strains were analyzed for expression of CD2 forms. When mAb 12-15 was used in cytotoxic T lymphocyte inhibition experiments using specific CTL and tumor target cells it was found that the antibody could specifically inhibit CTL-mediated lysis presumably by interfering with CD2 function." @default.
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- W2045221369 date "1989-02-01" @default.
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- W2045221369 title "Antibody 12-15 cross-reacts with mouse Feγ receptors andCD2: study of thymus expression, genetic polymorphism and biosynthesis of the CD2 protein" @default.
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- W2045221369 doi "https://doi.org/10.1002/eji.1830190219" @default.
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