Inhibition of superoxide anion production in guinea pig polymorphonuclear leukocytes by a seleno-organic compound, ebselen.

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Abstract
Production of superoxide anion (O2-) induced by tetradecanoyl phorbol acetate (TPA) in intact guinea pig polymorphonuclear leukocytes (PMNL) was markedly inhibited by a seleno-organic compound, 2-phenyl-1,2-benzisoselenazol-3(2H)-one (Ebselen), with glutathione peroxidase-like activity. The compound almost completely inhibited O2- production by a particulate fraction prepared from TPA-treatment PMNL as a concentration aslow as 250 nM.