title: Is methane a new therapeutic gas?
abstract: BACKGROUND
  Methane is an attractive fuel. Biologically, methanogens in the colon can use carbon dioxide and hydrogen to produce methane as a by-product. It was previously considered that methane is not utilized by humans. However, in a recent study, results demonstrated that methane could exert anti-inflammatory effects in a dog small intestinal ischemia-reperfusion model.
  Actually, the bioactivity of methane has been investigated in gastrointestinal diseases, but the exact mechanism underlying the anti-inflammatory effects is required to be further elucidated. Methane can cross the membrane and is easy to collect due to its abundance in natural gas. Although methane is flammable, saline rich in methane can be prepared for clinical use. These seem to be good news in application of methane as a therapeutic gas.
  
  
  CONCLUSIONS
  Several problems should be resolved before its wide application in clinical practice.
authors.affiliation: Department of Diving Medicine, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, P,R, China. sunxjk@hotmail.com.
authors.forename: Wenwu
authors.initials: W
authors.lastname: Liu
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Hengyi
authors.initials: H
authors.lastname: Tao
authors.forename: Xuejun
authors.initials: X
authors.lastname: Sun