title: Effect of ASTA Z 7557 (INN mafosfamide) a precursor of 4-hydroxy-cyclophosphamide on human T-lymphocytes' Fc-receptors and immunoregulatory functions.
abstract: The precursor ASTA Z 7557 of the in vivo active metabolite 4-hydroxy-cyclophosphamide (4OH-Cy) of cyclophosphamide (Cy) was tested for selective effects on human T-lymphocytes' Fc gamma-receptor expression and certain immunoregulatory functions. It has been found that ASTA Z 7557 does not alter the expression of Fc gamma-F- or Fc gamma-I-receptors on the T-cell membrane nor does it exhibit differential toxicity for either T-cell subpopulation. PWM-induced B-cell proliferation is inhibited by ASTA Z 7557, whereas B-cells' Ig-synthesis as well as ConA-driven T-cell proliferation is only blocked with higher doses of the reagent. Final concentrations above 1 microgram/ml may therefore abrogate ConA-induction of suppressor T-lymphocytes. Already ConA-activated suppressor cells of PWM-driven B-cell cultures, however, are not inhibited even with high doses of ASTA Z 7557.
mesh_terms: D001402:B-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D003520:Cyclophosphamide / Q000031:analogs & derivatives* / Q000494:pharmacology; D006801:Humans; D007136:Immunoglobulins / Q000096:biosynthesis*; D008213:Lymphocyte Activation / Q000187:drug effects; D011043:Pokeweed Mitogens / Q000494:pharmacology; D011961:Receptors, Fc / Q000276:immunology*; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects / Q000276:immunology
chemical_list: D007136:Immunoglobulins; D011043:Pokeweed Mitogens; D011961:Receptors, Fc; D003208:Concanavalin A; C037933:Asta Z 7557; D003520:Cyclophosphamide