[Reduction of cytochrome p-450 content and activity by porphyrins after damage to the microsomal membrane by tetrachloromethane].

Natural porphyrin (hemin and its synthetic analogue--tetraphenylporphyrin with iron TPP-Fe3+) has been studied for its effect on activity of monooxygenase responses and cytochrome P-450 content against a background of introduction of four-chlorine carbon in the in vitro experiments. The reducing effect of hemin and TPP-Fe3+ on cytochrome P-450 and dependent enzymes: N-demethylase, n-hydroxylase and benz(a)pyrene hydroxylase has been noticed; the synthetic analogue of heme was more efficient.