title: Gastric bypass surgery does not increase susceptibility to Helicobacter pylori infection in the stomach of rat or mouse.
abstract: Gastric bypass is a clinical option for obesity surgery. An increased susceptibility to Helicobacter pylori infection in the bypassed stomach has been speculated. The aim of the present study was to examine the susceptibility of the bypassed stomach to H. pylori infection in rats and mice. Adult Sprague-Dawley and Wistar rats and NMRI mice were subjected to either gastric bypass or laparotomy only as control. The animals were inoculated with the CagA- and VacA- positive H. pylori strain 67/21 (not mouse-adapted) in the first experiment and with 9 additional isolates in the second, by injection into the bypassed stomach or the control stomach during surgery. The stomach of each animal was collected for H. pylori culture 2-3 weeks later. While all the rats were H. pylori negative, 54% of gastric bypassed mice and 75% of controls were positive (P = 0.4). We conclude that susceptibility to H. pylori infection in the stomach is not increased by gastric bypass surgery.
authors.affiliation: Department of Cancer Research and Molecular Medicine, University Hospital Trondheim, Olav Kyrres gate 17, 7006 Trondheim, Norway.
authors.forename: Björn
authors.initials: B
authors.lastname: Stenström
authors.forename: Kirsti
authors.initials: K
authors.lastname: Løseth
authors.forename: Lars
authors.initials: L
authors.lastname: Bevanger
authors.forename: Erik
authors.initials: E
authors.lastname: Sturegård
authors.forename: Torkel
authors.initials: T
authors.lastname: Wadström
authors.forename: Duan
authors.initials: D
authors.lastname: Chen
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D004198:Disease Susceptibility / Q000150:complications; D005260:Female; D015390:Gastric Bypass / Q000379:methods*; D016481:Helicobacter Infections / Q000209:etiology / Q000382:microbiology*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D013270:Stomach / Q000382:microbiology / Q000473:pathology / Q000601:surgery*