title: Human T-lymphocyte subset specificity of the regulatory effects of leukotriene B4.
abstract: Leukotriene B4, but not (12S)-leukotriene B4, coupled to fluorescein-labeled human serum albumin interacts specifically with human T lymphocytes, as assessed by fluorescence-activated flow cytometry. Approximately 11% of blood T lymphocytes bind the fluorescent conjugate of leukotriene B4. The leukotriene B4-reactive T lymphocytes are distributed between the suppressor-cytotoxic (14%) and helper-inducer (8%) subsets, which were identified concurrently by phycoerythrin-labeled monoclonal antibodies to subset-specific antigens. Leukotriene B4, but not (12S)-leukotriene B4 or leukotriene C4, enhances significantly the proliferation of mitogen-stimulated purified suppressor-cytotoxic T lymphocytes, at concentrations of 10(-12) M to 10(-6) M, and inhibits significantly the proliferation of mitogen-stimulated purified helper-inducer T lymphocytes, at concentrations of 10(-8) M to 10(-6) M, as assessed by the uptake of [3H]thymidine. The net effect of leukotriene B4 on blood T lymphocytes is immunosuppression, which may be expressed in some human hypersensitivity and inflammatory diseases.
mesh_terms: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000032:analysis; D002469:Cell Separation; D006801:Humans; D007975:Leukotriene B4 / Q000494:pharmacology*; D008213:Lymphocyte Activation / Q000187:drug effects; D013601:T-Lymphocytes / Q000145:classification / Q000187:drug effects* / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects; D006377:T-Lymphocytes, Helper-Inducer / Q000187:drug effects; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D007975:Leukotriene B4