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By contrast the longer GLP-1 (1-37) peptide did not stimulate insulin release from the perfused rat pancreas even at high non-physiological concentrations
Eng, J., Kleinman, W
d , Cumulative food intake
Since the use of animal insulin for the treatment of diabetes in 1922, about nine major classes of drugs for the treatment of diabetes have been discovered and developed worldwide, including sulfonylureas, biguanides, -glucosidase inhibitors, insulins, thiazolidinediones (TZDs), meglitinides, GLP-1RAs, DPP-4 inhibitors, and SGLT-2 inhibitors
In pancreas, the main expression sites of GLP-1R are located in pancreatic cells and cells (Richards et al., 2014), and the expression of GLP-1R in cells was about 0.2% of that in cells (Tornehave et al., 2008)