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. 1988 Feb 15;250(1):161–169. doi: 10.1042/bj2500161

Increased oxidation of uroporphyrinogen by an inducible liver microsomal system. Possible relevance to drug-induced uroporphyria.

F De Matteis 1, C Harvey 1, C Reed 1, R Hempenius 1
PMCID: PMC1148828  PMID: 3128275

Abstract

1. The hypothesis that uroporphyria-inducing drugs stimulate the oxidation of uroporphyrinogen by a microsomal NADPH-dependent mechanism was tested. 2. 3,4,3',4'-Tetrachlorobiphenyl, a very effective inducer of uroporphyria in chick-embryo hepatocyte cultures, stimulates the NADPH-dependent oxidation of uroporphyrinogen by chick-embryo microsomal fraction in vitro. 3. Two different actions of 3,4,3',4'-tetrachlorobiphenyl are apparently required for this effect: (a) induction of a microsomal system by treatment in vivo and (b) interaction with the induced microsomal fraction in vitro, producing an oxidizing species. 4. The analogue 2,4,2',4'-tetrachlorobiphenyl is relatively ineffective in both the production of porphyria in culture and the stimulation of porphyrinogen oxidation in vitro. 5. Rat hepatocytes do not develop uroporphyria when treated with polychlorinated biphenyls in culture, yet they respond to these drugs with typical induction of cytochrome P-448-dependent drug metabolism. 6. These data provide support for the hypothesis of an increased oxidation of uroporphyrinogen in drug-induced uroporphyria, but also suggest that induction of cytochrome P-448 is not the only factor involved. 7. Both I and III isomers of uroporphyrin and heptacarboxylate porphyrin accumulate when chicken hepatocytes are made uroporphyric by drugs; treatment with desferrioxamine causes a marked decrease in both isomers, suggesting that iron may be involved in the accumulation of both.

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Selected References

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