Glucagon-like peptide-1 receptor signaling in metabolic research
The GLP-1 receptor (GLP-1R) is a class B G-protein coupled receptor expressed primarily on pancreatic beta cells, neurons in the hypothalamus, and cells in the gastrointestinal tract.
Upon ligand binding, GLP-1R couples to Gαs, activating adenylyl cyclase and increasing intracellular cAMP levels. This triggers PKA-dependent and Epac2-dependent pathways that enhance glucose-dependent insulin secretion.
GLP-1R activation in the arcuate nucleus and paraventricular nucleus modulates appetite signaling through POMC neuron activation and NPY/AgRP neuron inhibition. This central mechanism is distinct from peripheral incretin effects.
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Vagal GLP-1R activation delays gastric emptying through a centrally mediated mechanism involving the nucleus tractus solitarius and dorsal motor nucleus of the vagus nerve.
Semaglutide provides selective GLP-1R agonism with extended pharmacokinetics via albumin binding. Tirzepatide adds GIP receptor co-agonism for dual pathway investigation. Retatrutide further extends to glucagon receptor triple agonism. Cagrilintide targets the complementary amylin receptor pathway.
Active areas include: biased agonism at GLP-1R (G-protein vs β-arrestin signaling), receptor internalization kinetics, and cross-talk between GLP-1R and GIPR pathways in metabolic tissues.
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