Abstract
Insulin resistance is followed by an islet adaptation resulting in a compensating increase in insulin secretion and hyperinsulinemia. The mechanism underlying this increased insulin secretion is not established. We studied whether islet phospholipase A2 (PLA2) contributes by using C57BL/6J mice fed a high-fat diet, since we previously showed that the insulin responses to the two PLA2-activating insulin secretagogues carbachol and cholecystokinin (CCK) are enhanced in this model. CCK (100 nM) and carbachol (100 μM) stimulated [3H]AA efflux, reflecting PLA2 activation, both in islets from mice after 12 weeks on high-fat diet and in controls. The efflux increase was more pronounced in islets from high-fat diet-fed mice during both CCK (by 93 ± 46%; P = 0.034) and carbachol (by 64 ± 22%; P = 0.009) stimulation. Also a direct PLA2 activation by mellitin (2 μg/ml) elicited a potentiated efflux in islets from the insulin-resistant mice (by 361 ± 107%; P = 0.002). The results suggest that exaggerated non-glucose-induced PLA2 activation contributes to the islet compensation in insulin resistance.
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