title: Lack of T cell antigen expression on hairy cells of B cell origin after in vitro exposure to PHA.
abstract: The malignant monoclonal population in hairy cell leukemia (HCL) has been variously ascribed to be of myeloid, B, or even T cell origin. Recent data have been interpreted as suggesting that hairy cells (HC) may concomitantly or serially express both B and T surface determinants, a phenomenon which, if verified, would be unique among the lymphoproliferative malignancies. Data described here, however, demonstrate that (1) at least the majority of HCL are phenotypically of B cell derivation, and (2) the initial B cell phenotype is retained and solely expressed on cultured as well as phytohemagglutinin (PHA) activated monoclonal malignant HC.
mesh_terms: D000328:Adult; D000368:Aged; D000954:Antigens, Surface / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology* / Q000473:pathology; D002469:Cell Separation; D006801:Humans; D007943:Leukemia, Hairy Cell / Q000276:immunology* / Q000378:metabolism; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D010835:Phytohemagglutinins / Q000494:pharmacology; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000528:radiation effects
chemical_list: D000954:Antigens, Surface; D010835:Phytohemagglutinins