title: Superior appetite hormone profile after equivalent weight loss by gastric bypass compared to gastric banding.
abstract: The goal of this study was to understand the mechanisms of greater weight loss by gastric bypass (GBP) compared to gastric banding (GB) surgery. Obese weight- and age-matched subjects were studied before (T0), after a 12 kg weight loss (T1) by GBP (n = 11) or GB (n = 9), and at 1 year after surgery (T2). peptide YY(3-36) (PYY(3-36)), ghrelin, glucagon-like peptide-1 (GLP-1), leptin, and amylin were measured after an oral glucose challenge. At T1, glucose-stimulated GLP-1 and PYY levels increased significantly after GBP but not GB. Ghrelin levels did not change significantly after either surgery. In spite of equivalent weight loss, leptin and amylin decreased after GBP, but not after GB. At T2, weight loss was greater after GBP than GB (P = 0.003). GLP-1, PYY, and amylin levels did not significantly change from T1 to T2; leptin levels continued to decrease after GBP, but not after GB at T2. Surprisingly, ghrelin area under the curve (AUC) increased 1 year after GBP (P = 0.03). These data show that, at equivalent weight loss, favorable GLP-1 and PYY changes occur after GBP, but not GB, and could explain the difference in weight loss at 1 year. Mechanisms other than weight loss may explain changes of leptin and amylin after GBP.
authors.affiliation: New York Obesity Research Center, St Luke's Roosevelt Hospital Center, New York, New York, USA. mb3103@columbia.edu
authors.forename: Mousumi
authors.initials: M
authors.lastname: Bose
authors.forename: Sriram
authors.initials: S
authors.lastname: Machineni
authors.forename: Blanca
authors.initials: B
authors.lastname: Oliván
authors.forename: Julio
authors.initials: J
authors.lastname: Teixeira
authors.forename: James J
authors.initials: JJ
authors.lastname: McGinty
authors.forename: Baani
authors.initials: B
authors.lastname: Bawa
authors.forename: Ninan
authors.initials: N
authors.lastname: Koshy
authors.forename: Antonia
authors.initials: A
authors.lastname: Colarusso
authors.forename: Blandine
authors.initials: B
authors.lastname: Laferrère
mesh_terms: D000328:Adult; D000682:Amyloid / Q000097:blood / Q000378:metabolism; D001069:Appetite Regulation / Q000502:physiology; D005500:Follow-Up Studies; D015390:Gastric Bypass / Q000534:rehabilitation*; D015391:Gastroplasty / Q000379:methods / Q000534:rehabilitation*; D054439:Ghrelin / Q000097:blood / Q000378:metabolism; D052216:Glucagon-Like Peptide 1 / Q000097:blood / Q000378:metabolism; D006728:Hormones / Q000097:blood* / Q000378:metabolism / Q000502:physiology; D006801:Humans; D058228:Islet Amyloid Polypeptide; D020738:Leptin / Q000097:blood / Q000378:metabolism; D055442:Metabolome / Q000502:physiology; D008875:Middle Aged; D019894:Peptide YY / Q000097:blood / Q000378:metabolism; D013997:Time Factors; D015431:Weight Loss / Q000502:physiology*
chemical_list: D000682:Amyloid; D054439:Ghrelin; D006728:Hormones; D058228:Islet Amyloid Polypeptide; D020738:Leptin; D019894:Peptide YY; D052216:Glucagon-Like Peptide 1