Effect of poly(ADP-ribose) synthetase inhibitor administration to rats before and after injection of alloxan and streptozotocin on islet proinsulin synthesis - PubMed (original) (raw)
Effect of poly(ADP-ribose) synthetase inhibitor administration to rats before and after injection of alloxan and streptozotocin on islet proinsulin synthesis
Y Uchigata et al. Diabetes. 1983 Apr.
Abstract
Nicotinamide (10 mmol/kg) and 3-aminobenzamide (1.25 mmol/kg), poly(ADP-ribose) synthetase inhibitors, were injected intravenously to rats either 30 min before the intravenous administration of 12 mg/kg alloxan or 50 mg/kg streptozotocin ("pretreatment") or 5 min after the administration ("posttreatment"). Fifteen minutes after the injection of the diabetogenic agents, pancreatic islets were isolated from the rats and proinsulin synthesis was determined. Proinsulin synthesis was decreased in islets from rats treated with alloxan or streptozotocin. Pretreatment with poly(ADP-ribose) synthetase inhibitors was found to protect against alloxan- or streptozotocin-induced decrease in proinsulin synthesis. By posttreatment with poly(ADP-ribose) synthetase inhibitors, streptozotocin-induced decrease in proinsulin synthesis was also significantly reversed, whereas the decrease induced by alloxan was not.
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