Abstract
In an attempt to elucidate the mechanisms that control the hepatic DNA replication, effect of low doses of actinomycin D on DNA synthesis and c-myc expression during the early stage of liver regeneration was investigated. Small amounts of actinomycin D, in amounts that had no effect on the rate of RNA synthesis in normal rats, were multiple injected at 0, 2 and 4 hours after partial hepatectomy. DNA synthesis and c-myc expression in these rats were compared with those in untreated rats. Hepatic DNA synthesis in the treated rats was delayed about 4 to 6 hours in comparison with control rats. In contrast, time course of c-myc expression in inhibitor treated rats was very similar to that in control rats.
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