SELECTIVE INHIBITION OF THROMBOXANE BIOSYNTHESIS IN HUMAN BLOOD MONONUCLEAR CELLS AND THE EFFECTS ON MITOGEN‐STIMULATED LYMPHOCYTE PROLIFERATION

1 The effects of six imidazole compounds were examined on thromboxane B2 (TxB2) and prostaglandin E2 (PGE2) production and mitogen‐stimulated lymphocyte transformation in human blood mononuclear cells 2 UK 37248 (4‐(2‐[IH‐imidazol‐l‐yl]ethoxy)benzoic acid), imidazole and 1‐methylimidazole selectively inhibited TxB2 synthesis in a dose‐related manner, with corresponding increases in PGE2 production 3 Clotrimazole, benzimidazole and 2‐methylimidazole preferentially inhibited TxB synthesis but had little effect on PGE2 production 4 Clotrimazole and benzimidazole inhibited proliferative responses of the lymphocytes, but UK 37248 and 1‐methylimidazole did not affect transformation at concentrations which inhibited TxB2 synthesis to a similar level (over 90%) 5 The results do not support involvement of endogenous TxB2 in the process of lymphocyte mitogenesis or in the mechanism of the suppressive effects of some TxB2 synthetase inhibitors.

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