Effect of ezetimibe on incretin secretion in response to the intestinal absorption of a mixed meal.

American Journal of Physiology. Gastrointestinal and Liver Physiology
Li YangPatrick Tso

Abstract

Ezetimibe is a potent inhibitor of cholesterol absorption by enterocytes. Although ezetimibe minimally affects the absorption of triglyceride, it is unknown whether ezetimibe affects the secretion of the incretin hormones glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1). It has been shown that ezetimibe-treated mice are protected from diet-induced insulin resistance. Since GIP and GLP-1 promote the actions of insulin, we hypothesized that ezetimibe may affect the secretion of GIP and GLP-1 by enteroendocrine cells into lymph in response to the intestinal absorption of a mixed meal (Ensure). To test this hypothesis, we used the lymph fistula rat model to determine GIP and GLP-1 concentrations in lymph during the 2 h after the infusion of Ensure. Ezetimibe significantly reduced lymphatic cholesterol output during fasting, without coincident decreases in glucose, protein, and triglyceride outputs. However, ezetimibe did not influence cholesterol output after infusion of Ensure. Interestingly, ezetimibe significantly reduced the secretion of both GIP and GLP-1 into lymph after the infusion of Ensure. Therefore, the inhibitory effect of ezetimibe on GIP and GLP-1 secretion by enteroendocrine cel...Continue Reading

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Dec 12, 2012·Journal of Biomedical Optics·Timothy KassisJ Brandon Dixon
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