Inhibition of ferrochelatase and accumulation of porphyrins in mouse hepatocyte cultures exposed to porphyrinogenic chemicals.

作者: Angela M. Brady , Edward A. Lock

DOI: 10.1007/BF01974011

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摘要: The ability of 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC), 3,5-diethoxycarbonyl-4-ethyl-1,4-dihydro-2,6-dimethylpyridine (EDDC) and griseofulvin to induce porphyria in primary cultures mouse hepatocytes has been examined. Exposure cultured DDC, EDDC or resulted a marked inhibition ferrochelatase which was sustained over the 4-day exposure period. Maximal concentrations DDC (25 μM), μM) 14-fold, 30-fold 9-fold increases, respectively, total porphyrin culture medium. Analysis porphyrins accumulating indicated predominance protoporphyrin with all three xenobiotics. Addition 5-aminolaevulinic acid (ALA) hepatocyte (10–1000 much larger increases (up 164-fold) accumulation medium predominantly uroporphyrin. These studies have demonstrated that provide valid mechanism-based vitro model hepatic porphyrias produced by dihydropyridines mice.

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