We investigated the effects of human interleukin-13 (IL-13) on human monocytes' (MNC) activities against Candida albicans, an important human pathogen. Increased phagocytosis of blastoconidia was observed after incubation with 50 U ml(-1) of IL-13 for 4 h or 48 h in the presence or absence of serum. The latter effect was inhibited by anti-IL-13 monoclonal antibody or mannose. Incubation of MNC with 50 U ml(-1) of IL-13 for 2 h significantly enhanced superoxide anion production in response to phorbol myristate acetate. IL-13 did not, however, alter the damage caused by MNC to hyphae, whereas it suppressed killing of blastoconidia. IL-13 has variable effects on MNC activities and may play an important immunoregulatory role against C. albicans.
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