Ion transport across the cecum in normal and colitic mice Academic Article Article uri icon


MeSH Major

  • 6-Mercaptopurine
  • Azathioprine
  • Colorectal Neoplasms
  • Folic Acid
  • Inflammatory Bowel Diseases
  • Mesalamine
  • Ursodeoxycholic Acid


  • This study was conducted to determine the ion transport mechanisms in the normal mouse cecum and compare them to an inbred mouse model of colitis. The Ussing chamber-voltage clamp technique was used to monitor the short circuit current (I(sc)). The basal I(sc) in the normal cecum was 82.6 +/- 5.8 microA/cm2. It was not affected by bumetanide, 9-anthracene carboxylate, amiloride, and phenamil or by removal of Cl- ions; but was abolished by the removal of Na+ ions. Flux measurements revealed the presence of neutral NaCl transport. In the colitic cecum, the basal current was significantly higher than the normal cecum. Basal current in the normal cecum was due primarily to Na+ absorption through a Na+ channel, while in the colitic cecum it was due to Cl- ion secretion. cAMP addition in colitic cecum did not increase Cl- secretion, further suggesting that the tissue is already secreting at a maximal rate.

publication date

  • September 24, 1999



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1023/A:1026698507354

PubMed ID

  • 10492130

Additional Document Info

start page

  • 1539

end page

  • 46


  • 44


  • 8