Regulation of the glucose enhanced insulin pool.

Exposure of islets to high levels of glucose at a critical time leads to enhanced insulin release when later stimulated by glucose. Newly synthesized insulin is preferentially released with subsequent stimulation, implying the creation or enlargement of a separately regulated pool of insulin in response to the initial stimulus. Epinephrine via beta adrenergic receptors can trigger the discharge of the enhanced insulin pool via a beta adrenergic receptor response. Raising intracellular cAMP levels or stimulation by arginine also discharge the marked pool. The enhanced pool is accessible by several independent mechanisms.