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Using 3H-thymidine labeling techniques, we found that rates of DNA synthesis in islet cells doubled when mouse pancreatic islets were cultured for 1 week with 10 mmol/l nicotinamide, a potent poly(ADP-ribose) synthetase inhibitor. Culture with nicotinamide partially inhibited glucose-stimulated insulin release, whereas the islet insulin content and rate of (pro)insulin biosynthesis remained unchanged. Long-term exposure to nicotinamide decreased glucose oxidation and ATP content in the islets. The findings support the view that poly(ADP-ribose)synthetase inhibitors stimulate islet cell replication, but may be accompanied by significant inhibitory effects on islet cell function.

Long-term effects of exposure of pancreatic islets to nicotinamide in vitro on DNA synthesis, metabolism and B-cell function