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  • Title: Beyond glycemic control: the effects of incretin hormones in type 2 diabetes.
    Author: Martin CL.
    Journal: Diabetes Educ; 2008; 34 Suppl 3():66S-72S. PubMed ID: 18525067.
    Abstract:
    The improved understanding of glucoregulatory hormones has driven the development of new pharmacologic agents to treat type 2 diabetes. One new class of antihyperglycemic medication is incretin mimetics (IMs). Incretin hormones potentiate insulin secretion following meal ingestion, a process that is impaired in patients with type 2 diabetes. GLP-1, a 30-amino acid peptide incretin hormone, is produced in the L cells of the ileum and colon. Studies have shown that a 6-week continuous GLP-1 infusion in patients with type 2 diabetes improved glycemic control and beta-cell function and delayed gastric emptying. Despite the rapid degradation and inactivation of GLP-1 by the enzyme dipeptidyl peptidase IV (DPP-IV), agents that mimic the actions of GLP-1 are of great clinical interest. First-in-class IM exenatide, a GLP-1 receptor agonist resistant to DPP-IV inactivation, mimics many beneficial glucoregulatory effects of GLP-1, such as suppressing glucagon secretion, regulating gastric emptying and satiety, and increasing glucose-dependent insulin secretion. Exenatide is an adjunctive therapy for patients who take metformin, a sulfonylurea, a thiazolidinedione, or a combination of these oral medications but have not achieved glycemic control. An 82-week, open-label extension trial has shown that exenatide is well tolerated and that the benefits, including improved glycemic control, weight loss, and mitigation of cardiovascular risk factors, are sustained.
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