Abstract
Nitric oxide has recently been identified as the primary toxic effector molecule in the lysis of islet cells by inflammatory macrophages. We show here that N-nitro-L-argininemethylester (NAME), an inhibitor of endothelial and macrophage NO synthase partially suppresses diabetes development in the low dose streptozotocin induced diabetes model in C57BL/6J mice. Mean blood glucose levels were lower in the group receiving NAME throughout the observation periof of 30d (p < 0.05–0.001). Similar concentrations of NAME as expected in vivo were tested in vitro in macrophage — islet cell cocultures and were found to partially suppress NO production and islet cell lysis. We conclude that NO synthase activity is a pathogenetic factor in diabetes development.
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