title: Expression of Tac antigen on human immature B-cell lineage leukemic cells.
abstract: Expression of interleukin 2 (IL-2) receptor (Tac antigen) on leukemic cells from 4 patients with acute lymphocytic leukemia (ALL) and 3 patients with blastic crisis of chronic myelogenous leukemia (CML-BC) was examined. Cells from 6 out of 7 patients did not carry immunoglobulins on their surfaces, but reacted with monoclonal antibodies (mAb) detecting B-cell related antigens such as B1, OKB2 and Leu12. Cells from two cases expressed Tac antigen immediately after cell separation. Phorbol 12-myristate 13-acetate (PMA) could induce Tac antigen in all cases. SDS-PAGE analysis of immunoprecipitates by anti-Tac mAb demonstrated that the molecular weight of Tac antigen on most of the leukemic cells was similar to that of Tac antigen present on Con A-stimulated normal lymphocytes. These leukemic cells poorly responded to exogenous recombinant IL-2. These findings suggest that IL-2 may interact with the immature and mature B cells, and play an important role in the differentiation of B lymphocytes.
mesh_terms: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000032:analysis*; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002453:Cell Cycle / Q000187:drug effects; D002454:Cell Differentiation; D011232:Chemical Precipitation; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D007945:Leukemia, Lymphoid / Q000276:immunology / Q000473:pathology; D015470:Leukemia, Myeloid, Acute / Q000276:immunology / Q000473:pathology; D008970:Molecular Weight; D011971:Receptors, Immunologic / Q000378:metabolism*; D015375:Receptors, Interleukin-2; D011994:Recombinant Proteins / Q000494:pharmacology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D007376:Interleukin-2; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D011994:Recombinant Proteins; D013755:Tetradecanoylphorbol Acetate