The anti-inflammatory effects of methane

Critical Care Medicine
Mihály BorosJózsef Kaszaki

Abstract

Gastrointestinal methane generation has been demonstrated in various stress conditions, but it is not known whether nonasphyxiating amounts have any impact on the mammalian pathophysiology. We set out to characterize the effects of exogenous methane administration on the process of inflammatory events arising after reoxygenation in a large animal model of ischemia-reperfusion. A randomized, controlled in vivo animal study. A university research laboratory. Inbred beagle dogs (12.7 6 2 kg). Sodium pentobarbital-anesthetized animals were randomly assigned to sham-operated or ischemia-reperfusion groups, where superior mesenteric artery occlusion was maintained for 1 hr and the subsequent reperfusion was monitored for 3 hrs. For 5 mins before reperfusion, the animals were mechanically ventilated with normoxic artificial air with or without 2.5% methane. Biological responses to methane-oxygen respirations were defined in pilot rat studies and assay systems were used with xanthine oxidase and activated canine granulocytes to test the in vitro bioactivity potential of different gas concentrations. The macrohemodynamics and small intestinal pCO(2) gap changes were recorded and peripheral blood samples were taken for plasma nitrite/nit...Continue Reading

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