Abstract
CD95 (Fas antigen/APO-1) is up-regulated in activated lymphocytes, and monoclonal antibody (mAb) to CD95 induces apoptosis. HLA class II molecules play a key role in antigen presentation, ligation of which induces signal transduction. We examined 18 lymphoid cell lines (15 B cell and 3 T cell lines) to investigate the effects of ligation of HLA class II molecules on CD95-mediated apoptosis. All of the five immature B cell lines were sensitive to anti-CD95 mAb, and ligation of HLA class II molecules promoted CD95-mediated apoptosis. In seven B-blastoid cell lines, two Burkitt lines were resistant to anti-CD95 mAb in spite of high expression of CD95. In three of five non-Burkitt B-blastoid lines, CD95-mediated apoptosis was augmented by treatment with anti-HLA class II mAb, while the other two lines lacking CD95 were resistant to anti-CD95 mAb. Three plasmacytic cell lines showed CD95-mediated apoptosis, but enhancement by anti-HLA class I mAb was slight in one cell line and was not observed in the other two lines. Out of three HLA class II antigen-positive T cell lines, CD95-mediated apoptosis was observed to some degree in one call line but was not promoted by the treatment with anti-HLA class II mAb, and the other two cell lin...Continue Reading
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