title: Biochemical comparison of HLA-DR molecules derived from autologous human T and B lymphoblasts.
abstract: Earlier findings that human activated T blasts display HLA-DR determinants have been confirmed. After phytohemagglutinin activation, Percoll gradient-purified blast cells were cultured for two weeks in mitogen-derived supernatants from human lymphocyte cultures. Using purified T blasts and internal labeling procedures, it was established that T blasts actively produced HLA-DR-like chains, as assessed by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Further, HLA-DR chains obtained from Epstein-Barr virus-transformed B cells and from T blasts of the same donor were compared. Two-dimensional gel electrophoretic comparisons indicated a striking homology between 29 kD and 35kD chains, obtained from the two different cell types. Peptide map analysis and preliminary amino acid sequence comparisons further supported this similarity. A more complete analysis would, however, be required to prove actual identity. The fact that human T blasts produce and display HLA-DR molecules very similar, if not identical, to those present on B cells must then be incorporated into models discussing major histocompatibility complex-restricted collaborations involving HLA-DR molecules.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology* / Q000276:immunology; D055598:Chemical Phenomena; D002621:Chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D004854:Herpesvirus 4, Human / Q000276:immunology; D000949:Histocompatibility Antigens Class II; D006801:Humans; D007525:Isoelectric Focusing; D008213:Lymphocyte Activation; D008934:Mitogens / Q000494:pharmacology; D010455:Peptides; D012756:Sheep; D013601:T-Lymphocytes / Q000166:cytology* / Q000276:immunology
chemical_list: D000949:Histocompatibility Antigens Class II; D008934:Mitogens; D010455:Peptides