Abstract
The effects of a short-term in vivo administration of two liver tumour promoters (phenobarbital and 1,1,1-trichloro-2,2-bis( p-chlorophenyl)ethane on rat liver endoplasmic reticulum Ca 2+-ATPase were investigated. The specific activity values of this membrane-bound enzyme significantly decreased ( P < 0.01) by 51% for phenobarbital-treated rats and by 48% for 1,1,1-trichloro-2,2-bis( p-chlorophenyl)ethane-treated rats compared with control animals. The depression of liver endoplasmic reticulum Ca 2+-ATPase appears to be a manifestation of the toxicological effect of tumour promoters.
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