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. 1972 Mar;126(5):1149–1160. doi: 10.1042/bj1261149

Stimulation of liver 5-aminolaevulinate synthetase by drugs and its relevance to drug-induced accumulation of cytochrome P-450. Studies with phenylbutazone and 3,5-diethoxycarbonyl-1,4-dihydrocollidine

F De Matteis 1, A Gibbs 1
PMCID: PMC1178538  PMID: 5073727

Abstract

The relevance of the stimulation of 5-aminolaevulinate synthetase to the accumulation of cytochrome P-450 after administration of drugs was examined in rats treated with phenylbutazone and with 3,5-diethoxycarbonyl-1,4-dihydrocollidine. 3,5-Diethoxycarbonyl-1,4-dihydrocollidine alone stimulated 5-aminolaevulinate synthetase without increasing the concentration of cytochrome P-450, whereas phenylbutazone alone increased the microsomal cytochrome P-450 without significantly affecting the activity of the enzyme. When the two drugs were given together both effects were found. It is concluded that if an increased amount of 5-aminolaevulinate and haem must be made to provide for the accumulation of cytochrome P-450, it need only be a small amount. It is also concluded from these findings that stimulation of the drug-metabolizing system on the one hand and marked enhancement of 5-aminolaevulinate synthetase activity and porphyria on the other are likely to result from different actions of the drugs. Evidence is presented suggesting that porphyrogenic drugs stimulate markedly the activity of 5-aminolaevulinate synthetase by lowering the concentration of haem in the liver, thereby decreasing the normal feedback control. With 3,5-diethoxycarbonyl-1,4-dihydrocollidine a rapid inhibition of mitochondrial ferrochelatase and of liver haem synthesis may be the primary mechanism involved.

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Selected References

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