Abstract
Aflatoxin B1 (AFB1) has been known to impair specific and nonspecific immunity. In the present study, we tested various functions of murine peritoneal macrophages that were isolated and stimulated with LPS after AFB1 (400 μg/5 ml/kg) was administered every other day for 2 weeks. AFB1 decreased phagocytosis and the production of superoxide anion (O−2) and hydrogen peroxide (H2O2), compared to those of corn oil-treated control group. In addition, the production of NO and TNF-α was decreased in macrophages of AFB1-treated mice. In vitro antitumor activity of in vivo AFB1-treated macrophages was reduced against target cell, L929. Taken together, these results suggested that AFB1 might have the immunosuppressive effect on macrophages after in vivo exposure, which was related to the antitumor activity reduction.
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