title: Suppression of T lymphocyte mitogen response in patients with mastocytosis.
abstract: Immunological functions were studied in 22 patients with mastocytosis. Lymphocyte stimulation with concanavalin A (Con A) and phytohemagglutinin showed that the patients responded with lower mitogenic activity than healthy controls. Furthermore, the lymphocytes of patients with the most extensive mast cell disease had a significantly lower Con A mitogen response than the lymphocytes of the rest of the patients. The effect of histamine and its specific metabolites, tele-methylhistamine and tele-methylimidazoleacetic acid (MeImAA), on the Con A lymphocyte mitogen response was also studied in healthy controls. Histamine had a clear suppressive effect, while the metabolite tele-methylhistamine caused only slight inhibition and MeImAA apparently had no effect. The total T cell, suppressor and helper cell numbers, measured with monoclonal antibodies, and the amount of immunoglobulins in serum were found to be normal.
mesh_terms: D000328:Adult; D000368:Aged; D003208:Concanavalin A / Q000494:pharmacology; D005260:Female; D006632:Histamine / Q000378:metabolism / Q000494:pharmacology; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology; D066298:In Vitro Techniques; D008213:Lymphocyte Activation / Q000187:drug effects; D008297:Male; D008761:Methylhistamines / Q000494:pharmacology; D008875:Middle Aged; D008934:Mitogens / Q000494:pharmacology*; D010835:Phytohemagglutinins / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology*; D014582:Urticaria Pigmentosa / Q000276:immunology* / Q000378:metabolism
chemical_list: D007093:Imidazoles; D008761:Methylhistamines; D008934:Mitogens; D010835:Phytohemagglutinins; D003208:Concanavalin A; C002667:methylimidazoleacetic acid; D006632:Histamine; C020404:tele-methylhistamine