Abstract
Thymidylate kinase activity was assayed in the supernatant extracts of liver and kidney from adult rats previously injected with thymidine. Prior X-ray and actinomycin D treatment did not affect the increased level of activity found 1 h after the deoxyribonucleoside was administered. Starvation up to 72 h also had little if any influence on the response to thymidine. Thus, the elevations of thymidylate kinase activity found after hepatectomy or thymidine injection are disparate in their reaction to X-ray and actinomycin D treatment. The thymidine response also differs from other substrate-responsive enzyme systems in rat liver.
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