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  • Title: The role of intestinal microflora in the metabolic reduction of 1-nitropyrene to 1-aminopyrene in conventional and germfree rats and in humans.
    Author: El-Bayoumy K, Sharma C, Louis YM, Reddy B, Hecht SS.
    Journal: Cancer Lett; 1983 Jul; 19(3):311-6. PubMed ID: 6688375.
    Abstract:
    1-Nitropyrene (100 mg/kg body wt.) was administered by gavage to conventional and germfree Fischer 344 rats. 1-Aminopyrene was detected in the feces of conventional rats (5-6% of the dose) but not in the feces of germfree rats. Conjugates of 1-aminopyrene were not detected in the feces of germfree rats and neither 1-aminopyrene nor its conjugates were found in the urine of either conventional or germfree rats. Since reduction of 1-nitropyrene to 1-aminopyrene is an activation process, the results indicate that intestinal microflora are important in the metabolic activation of 1-nitropyrene in vivo in the rat. Human intestinal microflora also reduced 1-nitropyrene to 1-aminopyrene.
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