Factors influencing peroxisome proliferation in cultured rat hepatocytes |
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Authors: | Angela M Mitchell James W Bridges Clifford R Elcombe |
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Institution: | (1) Biochemical Toxicology Section, Imperial Chemical Industries PLC, Central Toxicology Laboratory, SK10 4TJ Alderley Park, Macclesfield, Cheshire, UK;(2) Robens Institute of Industrial and Environmental Health and Safety, University of Surrey, GU2 5XH Guildford, Surrey, UK |
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Abstract: | A primary rat hepatocyte culture system has been developed for the study of peroxisome proliferation. Maximal induction of peroxisomal activity requires supplementation of the culture medium with hydrocortisone. The addition of clofibric acid (0.01–1 mM), mono-(2-ethylhexyl)phthalate (0.01–0.5 mM) and trichloroacetic acid (0.1–5 mM) to cultured rat hepatocytes resulted in a time- and dose-related increase in CN- insensitive palmitoyl CoA oxidation (maximal increases: 27-, 15.5-, and 5-fold respectively) and mitochondrial -glycerophosphate dehydrogenase activity (maximal increases: 7.3-, 5.8-, and 1.6-fold respectively). Electron microscopic examination revealed smooth endoplasmic reticulum proliferation and morphometric analysis indicated an increase in fractional peroxisomal volume of X 8 and X 4 for clofibric acid (1 mM) and trichloroacetic acid (2.5 mM), respectively. SDS-PAGE of cell homogenates revealed an intensified protein band of mol. wt. 76–78,000. The induction of peroxisomal -oxidation by clofibric acid was elevated from 9- to 12-fold by supplementation of the medium with l-carnitine (2mM). |
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Keywords: | Peroxisomes Hepatocyte cultures Clofibric acid Mono-(2-ethyl-hexyl)phthalate Trichloroacetic acid |
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