Plasma ghrelin in obesity before and after weight loss after laparoscopical adjustable gastric banding

The Journal of Clinical Endocrinology and Metabolism
Ursula Hanusch-EnsererMichael Roden

Abstract

Weight reduction after gastric bypass surgery has been attributed to a decrease of the orexigenic peptide ghrelin, which may be regulated by insulin and leptin. This study examined effects of long-term weight loss after laparoscopical adjustable gastric banding on plasma ghrelin and leptin concentrations and their relationship with insulin action. Severely obese patients (15 women, three men, 36 +/- 12 yr) underwent clinical examinations every 3 months and modified oral glucose tolerance tests to assess parameters of insulin sensitivity and secretion every 6 months. After surgery, body mass index fell from 45.3 +/- 5.3 to 37.2 +/- 5.3 and 33.6 +/- 5.5 kg/m(2) at 6 and 12 months, respectively (P < 0.0001). This was associated with lower (P < 0.0001) plasma glucose, insulin, insulin resistance, waist circumference, and blood pressure. Plasma leptin decreased from 27.6 +/- 9.5 to 17.7 +/- 9.8 (P = 0.0005) and 12.7 +/- 5.1 ng/ml (P < 0.0001). Plasma ghrelin was comparable before and at 6 months (234 +/- 53; 232 +/- 53 pmol/liter) but increased at 12 months (261 +/- 72 pmol/liter; P = 0.05 vs. 6 months). At 6 and 12 months, ghrelin levels correlated negatively with fasting plasma insulin levels and hepatic insulin extraction but not...Continue Reading

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