GLP-1 is an incretin hormone produced by intestinal L cells and the brain. GLP-1 is released in response to food intake to stimulate glucose-dependent insulin secretion by the pancreas. Additionally, GLP-1 exerts multiple other effects, including inhibition of food intake, slowing gastric emptying, and inhibition of glucagon secretion. Thus, GLP-1 was considered as a good target for the treatment of T2DM. However, therapeutic application of GLP-1 is hampered due to its short circulating half-life (

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