| Abstract: | An increase in liver DNA synthesis (p less than 0.01) was found in rats with an intact liver 24 h after the administration of a single dose of triiodothyronine (200 micrograms/kg i.g.) Statistically significant stimulation of DNA synthesis was also found in rats given triiodothyronine (p less than 0.01) or etiroxate (p less than 0.05) for 3 days at 24-hour intervals. When a single dose of triiodothyronine was administered immediately after partial hepatectomy (65-70% resection of the liver), increased stimulation of DNA synthesis (p less than 0.01) was found 24 h after the operation. Etiroxate partly inhibited DNA synthesis (p less than 0.05). In rats given triiodothyronine at 24-h intervals, starting at the time of partial hepatectomy, DNA synthesis 72 h after the operation was double the value in the control group. Marked stimulation of DNA synthesis by triiodothyronine (p less than 0.01) and an increase in the total DNA content of the liver (p less than 0.05) were likewise found 48 h after partial hepatectomy if the hormone was administered once, 24 h after the operation. The increase in the two indicators after the administration of etiroxate was not statistically significant. |
