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Browse CatalogMarch 15, 2025
Glucagon-like peptide-1 (GLP-1) is an endogenous incretin hormone produced by intestinal L-cells in response to nutrient ingestion. This 30-amino-acid peptide plays a central role in glucose homeostasis by stimulating insulin secretion in a glucose-dependent manner, suppressing glucagon release, slowing gastric emptying, and promoting satiety. The GLP-1 receptor (GLP-1R) is a class B G-protein-coupled receptor expressed in pancreatic beta cells, the central nervous system, heart, kidney, and gastrointestinal tract. Research into the GLP-1 system has been one of the most productive areas of peptide science over the past two decades.
Native GLP-1 has an extremely short plasma half-life of approximately two minutes due to rapid degradation by the enzyme dipeptidyl peptidase-4 (DPP-4). This limitation spurred extensive research into modified GLP-1 analogs with enhanced metabolic stability. Strategies for improving half-life include amino acid substitutions at the DPP-4 cleavage site, fatty acid acylation to promote albumin binding, fusion with the Fc region of immunoglobulin G, and PEGylation. Exendin-4, a 39-amino-acid peptide originally isolated from the saliva of the Gila monster lizard, shares approximately 53 percent sequence homology with human GLP-1 and served as a scaffold for early drug development due to its natural resistance to DPP-4 cleavage.
Contemporary research on GLP-1 receptor agonists extends well beyond glucose metabolism. Preclinical studies have investigated the neuroprotective potential of GLP-1R activation in models of neurodegenerative disease, the cardioprotective effects observed in large cardiovascular outcome trials, and the role of GLP-1 signaling in appetite regulation and body weight management. Dual and triple agonist peptides that simultaneously target GLP-1, glucose-dependent insulinotropic polypeptide (GIP), and glucagon receptors represent a frontier in peptide research, with several candidates under active investigation. Researchers working with GLP-1 analogs should be aware of their susceptibility to adsorption on laboratory plasticware and should use low-binding tubes and tips to minimize peptide loss during handling.