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Inhibition by sulfonamides of the candidacidal activity of human neutrophils.

Sulfonamides reduced substantially the ability of normal human neutrophils to kill strains of Candida albicans and Candida tropicalis, and impaired to a lesser extent their activity against Staphylococcus aureus 502A and Serratia marcescens. Sulfonamides also inhibited (a) iodination of Candida cells by normal neutrophils; (b) candidacidal activity in cell-free systems containing purified human myeloperoxidase, hydrogen peroxide, and potassium iodide; and (c) accumulation of molecular iodine in analogously constructed cell-free systems. In contrast to these effects on reactions catalyzed by myeloperoxidase, sulfonamides exerted relatively little effect on the levels of microbicidal activity manifested by human neutrophils that lacked myeloperoxidase. Sulfonamides appear to influence the function of human neutrophils predominantly by interfering with myeloperoxidase-mediated pathways. Certain basic and clinical implications of these data are discussed.