Abstract
1. Blood and liver concentrations of carbon tetrachloride were measured, at intervals after an oral dose, in rats given stock and protein-free diets. The values did not correlate with the resistance to poisoning found in the rats on protein-free diets. 2. The metabolism of carbon tetrachloride to carbon dioxide in vivo and in liver microsomal preparations was depressed in animals given protein-free diets. 3. Rats given a single dose of DDT [1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane] were highly sensitive to carbon tetrachloride poisoning. The livers of such animals had an increased microsomal protein content and greatly increased microsomal activity in the demethylation of Pyramidon (aminopyrine) and in the conversion of (14)CCl(4) into (14)CO(2). 4. The incorporation of [(14)C]leucine into protein by liver slices was depressed by carbon tetrachloride. This effect was decreased by addition of SKF525A (2-diethylaminoethyl 2,2-diphenyl-2-propylacetate) and in slices from rats given protein-free diets. It is suggested that the toxicity of carbon tetrachloride is closely linked to its metabolism.
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