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. 2023 May 11;17:1417–1432. doi: 10.2147/DDDT.S404055

Figure 4.

Figure 4

Cinchonine exerts insulinotropic and glucose-lowering effects by activating GLP-1R. (A) Treating islets with cinchonine (10 μM) under three glucose concentrations (2.8, 11.1, and 16.7 mM) revealed different levels of insulin secretion (n=7). (B) Effect of Exendin (9–39) on insulin secretion induced by cinchonine (n=7). (C) OGTT was performed on GLP-1R−/− mice, and AUC was calculated (D) (n=4). (E) OGTT was performed in hGLP-1R mice, and AUC was calculated (F) (n=5). All experimental results are expressed as mean ± SEM. Statistical differences in insulin secretion and blood glucose were obtained by one-way ANOVA or Student’s t-test. AUCs were compared using the Mann–Whitney Rank Sum test. *p<0.05, **p<0.01.