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GLP-1 and extra-islet effects.

The main target of action of glucagon-like peptide-1 (GLP-1) is the islet, where the hormone stimulates insulin secretion, promotes beta cell proliferation and neogenesis, and inhibits glucagon secretion. However, GLP-1 receptors are also expressed outside the islets, increasing the likelihood that GLP-1 also plays a role in other organs. These functions are mainly the inhibition of gastric emptying, gastric acid secretion and exocrine pancreatic secretion, indicating that the hormone acts as an enterogastrone--a hormone released from the distal portion of the small intestine that inhibits proximal gastrointestinal events. Another important action of GLP-1 is to induce satiety. Other effects of the hormone include cardioprotection, neuroprotection, induction of learning and memory, stimulation of afferent, sensory nerves, stimulation of surfactant production in the lung, dilatation of pulmonary vessels, induction of diuresis, and also under some conditions, induction of antidiabetic actions unrelated to islet function. Thus, GLP-1 clearly has several manifestations of activity. The physiological relevance of these actions and their contribution to the overall antidiabetic action of GLP-1 when used in treatment of type 2 diabetes remains to be established.