Infants with congenital hyperinsulinism owing to inactivating mutations in the KATP channel (KATPHI) who are unresponsive to medical therapy will require pancreatectomy to control the hypoglycemia. In preclinical studies, we showed that the GLP-1 receptor antagonist exendin-(9-39) suppresses insulin secretion and corrects fasting hypoglycemia in SUR-1−/− mice. The aim of this study was to examine the effects of exendin-(9-39) on fasting blood glucose in subjects with KATPHI. This was a randomized, open-label, two-period crossover pilot clinical study. Nine subjects with KATPHI received either exendin-(9-39) or vehicle on two different days. The primary outcome was blood glucose; secondary outcomes were insulin, glucagon, and GLP-1. In all subjects, mean nadir blood glucose and glucose area under the curve were significantly increased by exendin-(9-39). Insulin-to-glucose ratios were significantly lower during exendin-(9-39) infusion compared with vehicle. Fasting glucagon and intact GLP-1 were not affected by treatment. In addition, exendin-(9-39) significantly inhibited amino acid–stimulated insulin secretion in pancreatic islets isolated from neonates with KATPHI. Our findings have two important implications: 1) GLP-1 and its receptor play a role in the regulation of fasting glycemia in KATPHI; and 2) the GLP-1 receptor may be a therapeutic target for the treatment of children with KATPHI.
- Received February 10, 2012.
- Accepted May 15, 2012.
- © 2012 by the American Diabetes Association.
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