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- W2051036882 abstract "Administration of thyroxine to rat pups leads to precocious development of the pancreas. The role of ornithine decarboxylase (ODC) and polyamines in thyroxine-induced pancreatic maturation was examined. Rat pups (aged 5 days) were given daily subcutaneous injection of thyroxine (0.1 μg/g body wt.) until the day before death. Serial ODC activities were measured in pancreatic homogenates after 1,2,3,4,5,6,7 and 10 days of thyroxine treatment. There was a biphasic induction of ODC activities by thyroxine: an early peak appeared on day 2 of treatment followed by a decrease on day 4; a second peak was evident on day 5 and then a decrease to control values by day 7. Significant increases in tissue concentrations of putrescine and spermidine were observed concomitant with two peaks of ODC activity. Pancreatic amylase concentration, DNA and protein also showed a significant increase after thyrosine treatment. Difluoromethyl ornithine (DFMO), a specific ODC inhibitor, given orally (3% in drinking water) to nursing dams at postnatal day 5 for 5 days caused an 83% inhibition of pancreatic ODC activity in thyroxine-treated pups when compared to thyroxine-treated pups not exposed to DFMO. Concomitantly, the thyroxine-induced increases in pancreatic weight, protein and amylase activity were suppressed. Our results suggest that increases in ODC activities and polyamine levels are critical intermediary steps in the precocious induction of pancreatic development by thyroxine." @default.
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- W2051036882 date "1991-06-01" @default.
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- W2051036882 title "Essential role for polyamine biosynthesis in thyroxine stimulated pancreatic development in neonatal rats" @default.
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- W2051036882 doi "https://doi.org/10.1016/0167-4889(91)90139-o" @default.
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