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Malabsorption and Intestinal Adaptation After One Anastomosis Gastric Bypass compared to Roux-en-Y Gastric Bypass in Rats : Protein malabsorption after Mini Gastric Bypass

Abstract : The technically easier one-anastomosis (mini) gastric bypass (MGB) is associated with similar metabolic improvements and weight loss as the Roux-en-Y gastric bypass (RYGB). However, MGB is controversial and suspected to result in greater malabsorption than RYGB. In this study, we compared macronutrient absorption and intestinal adaptation after MGB or RYGB in rats. Body weight and food intake were monitored and glucose tolerance tests were performed in rats subjected to MGB, RYGB, or sham surgery. Carbohydrate, protein, and lipid absorption was determined by fecal analyses. Intestinal remodeling was evaluated by histology and immunohistochemistry. Peptide and amino acid transporter mRNA levels were measured in the remodeled intestinal mucosa and those of anorexigenic and orexigenic peptides in the hypothalamus. The MGB and RYGB surgeries both resulted in a reduction of body weight and an improvement of glucose tolerance relative to sham rats. Hypothalamic orexigenic neuropeptide gene expression was higher in MGB rats than in RYGB or sham rats. Fecal losses of calories and proteins were greater after MGB than RYGB or sham surgery. Intestinal hyperplasia occurred after MGB and RYGB with increased jejunum diameter, higher villi, and deeper crypts than in sham rats. Peptidase and peptide or amino acid transporter genes were overexpressed in jejunal mucosa from MGB rats but not RYGB rats. In rats, MGB led to greater protein malabsorption and energy loss than RYGB. This malabsorption was not compensated by intestinal overgrowth and increased expression of peptide transporters in the jejunum.
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https://www.hal.inserm.fr/inserm-01346181
Contributor : Maude Le Gall <>
Submitted on : Monday, July 18, 2016 - 2:25:52 PM
Last modification on : Wednesday, August 19, 2020 - 11:18:10 AM

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Jean-Baptiste Cavin, Eglantine Voitellier, Françoise Cluzeaud, Nathalie Kapel, Jean-Pierre Marmuse, et al.. Malabsorption and Intestinal Adaptation After One Anastomosis Gastric Bypass compared to Roux-en-Y Gastric Bypass in Rats : Protein malabsorption after Mini Gastric Bypass . AJP - Gastrointestinal and Liver Physiology, American Physiological Society, 2016, [Epub ahead of print]. ⟨10.1152/ajpgi.00197.2016⟩. ⟨inserm-01346181⟩

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