Jones PA, Hawtrey AO. Studies on the binding and distribution of radioactively labelled 3'-methylcholanthrene in subcellular fractions of rat liver.
Br J Cancer 1971;
25:845-52. [PMID:
5144545 PMCID:
PMC2008862 DOI:
10.1038/bjc.1971.98]
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Abstract
The subcellular distribution of either [(14)C] or [(3)H]3'-methylcholanthrene was studied in rat liver following a single intraperitoneal injection of the labelled hydrocarbon 10 hours previously.Adsorbed or non-covalently bound methylcholanthrene and its metabolic derivatives occurred in all cell fractions studied with the exception of purified cell walls. The highest specific activities (d.p.m./mg. protein) were found in washed mitochondria, microsomes and ribosome-free microsomal membranes.Covalent binding of methylcholanthrene and its metabolic derivatives to different cell fractions of rat liver occurs to a small extent and is considered not to be significant. The highest degree of binding occurs in washed mitochondria, microsomes, ribosome-free microsomal membranes and their constituent core proteins.Cell sap which contains non-covalently bound 3'-methylcholanthrene was fractionated into pH 5 enzyme and pH 5 supernatant fractions. The pH 5 enzyme fraction which possesses a high specific activity (d.p.m./mg. protein) was further fractionated with ammonium sulphate into three fractions. The 0-30% ammonium sulphate fraction had the highest specific activity.
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