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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Increased acid-sensing ion channel ASIC-3 in inflamed human intestine.

OBJECTIVES: Acid-sensing ion channels (ASICs) are expressed by rat sensory neurons and may mediate pain associated with tissue acidosis after inflammation or injury. Our aim was to examine the molecular forms and localization of ASICs in human intestine and dorsal root ganglia using immunochemical techniques, and to measure the effects of inflammation and injury. DESIGN AND METHODS: Inflamed Crohn's disease intestine and injured human dorsal root ganglia, with appropriate controls, were studied by Western blotting and immunohistochemistry, using specific affinity-purified ASIC antibodies. RESULTS: In the Western blot, there was a significant three-fold increase in the mean relative optical density of the ASIC-3 55-kDa band (but not ASIC-1 or ASIC-2) in full-thickness inflamed intestine, as well as in separated muscle and mucosal layers. There was a corresponding trend for an increased immunoreactive density and increased number of ASIC-3-positive neurons in the myenteric and sub-mucous plexus of inflamed intestine. In dorsal root ganglia, immunoreactivity for all ASICs was restricted to a sub-population (about 50%) of small-diameter (nociceptor) sensory neurons, and was generally less intense after injury. CONCLUSIONS: Increased ASIC-3 in inflamed intestine suggests a role in pain or dysmotility, for which ASICs represent new therapeutic targets.[1]


  1. Increased acid-sensing ion channel ASIC-3 in inflamed human intestine. Yiangou, Y., Facer, P., Smith, J.A., Sangameswaran, L., Eglen, R., Birch, R., Knowles, C., Williams, N., Anand, P. European journal of gastroenterology & hepatology. (2001) [Pubmed]
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