The effects of methane and hydrogen gases produced by enteric bacteria on ileal motility and colonic transit time
Version of Record online: 20 NOV 2011
© 2011 Blackwell Publishing Ltd
Neurogastroenterology & Motility
Volume 24, Issue 2, pages 185–e92, February 2012
How to Cite
Jahng, J., Jung, I. S. , Choi, E. J., Conklin, J. L. and Park, H. (2012), The effects of methane and hydrogen gases produced by enteric bacteria on ileal motility and colonic transit time. Neurogastroenterology & Motility, 24: 185–e92. doi: 10.1111/j.1365-2982.2011.01819.x
- Issue online: 16 JAN 2012
- Version of Record online: 20 NOV 2011
- Received: 29 July 2011 Accepted for publication: 20 October 2011
- colonic transit;
- ileal motility;
Background Gases produced by intestinal flora may modulate intestinal motor function in healthy individuals as well as those with functional bowel disease. Methane, produced by enteric bacteria in the human gut, is associated with slowed intestinal transit and constipation. The effects of hydrogen, another main gas produced by bacterial fermentation in the gut, on small bowel and colonic motor function remains unrecognized. Therefore, we set out to investigate whether intestinal gases including methane and hydrogen could influence the small bowel motility and colonic transit.
Methods Guinea pig ileum was placed in the peristaltic bath with tension transducers attached to measure velocity and amplitude of peristaltic contraction before and after the infusion of control, hydrogen, and methane gases. Also, changes in the intraluminal pressures were monitored before and after the gas infusions.
Key Results Methane decreased peristaltic velocity and increased contraction amplitude significantly of guinea pig ileum (P < 0.05). The AUC of intraluminal pressure was significantly increased with methane in guinea pig ileum (P < 0.05). In a second experiment, guinea pig colon was placed in the peristaltic bath to measure transit time before and after control, hydrogen, methane, and methane-hydrogen mixture gas infusions. Hydrogen shortened colonic transit time by 47% in the proximal colon, and by 10% in the distal colon, when compared with baselines (P < 0.05).
Conclusions & Inferences Methane delayed ileal peristaltic conduction velocity by augmenting contractility. Hydrogen shortened colonic transit, and that effect was more prominent in the proximal colon than distal colon.