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Glucagon-like Peptide 1, Glucose Metabolism and Gastric Bypass

The Role of Glucagon Like Peptide-1 in Glucose Metabolism and Weight Loss Following Gastric Bypass Surgery

Who can join

Ages 18 to 65 · All sexes · Healthy volunteers welcome

Inclusion Criteria:

* age 18-65
* healthy control without diabetes or active organ disease
* Individuals with bariatric surgery
* recurrent hypoglycemia post gastric bypass

Exclusion Criteria:

* pregnancy
* significant anemia
* diabetes currently unless pre-op for bariatric surgery procedure
* GI obstruction

About the study

The overall goal of this project is to understand the mechanisms by which gastric bypass surgery improves glucose metabolism.

The central hypothesis guiding this project is that the reconfiguration of intestinal transit with the Roux-en-Y will increase the release of insulinotropic GI hormones, termed incretins that improve insulin secretion and glucose metabolism. The study is divided into three specific aims.

1. To determine the role of incretin hormones on insulin secretion in patients with gastric bypass surgery using intravenous-oral hyperglycemic clamp. 2. To compare incretin effect and glucose tolerance among patient who suffer from hypoglycemia after RYGB and asymptomatic surgical and non-surgical individuals. 3. To quantify the contribution of GLP-1 to incretin effect enhancement following surgery.

What is being tested

• exendin-(9-39) (drug)
• exendin -(9-39) (drug)

Sponsor: The University of Texas Health Science Center at San Antonio · Participants: 80 · Started: 2005-11

Contact the study team

• Marzieh Salehi, MD MS · Phone: 210-567-6691
• Jennifer Foster, MSN · Phone: 210-450-8696

Official record on ClinicalTrials.gov — NCT01803451

Locations in the U.S.

Conditions

• Hypoglycemia

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.