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Am J Physiol Gastrointest Liver Physiol (January 22, 2003). doi:10.1152/ajpgi.00294.2002
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Submitted on July 22, 2002
Accepted on December 2, 2002

DISTRIBUTION OF INTERSTITIAL CELLS OF CAJAL IN THE TUNICA MUSCULARIS OF THE CANINE RECTO-ANAL REGION

Kazuhide Horiguchi1, Kathleen D. Keef1, and Sean M. Ward1*

1 Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV, USA

* To whom correspondence should be addressed. E-mail: Sean{at}physio.unr.edu.

The electrical and mechanical activity of the circular muscle layer in the rectoanal region of the gastrointestinal tract undergoes considerable changes in the site of dominant pacemaking activity, frequency and waveform shape. The present study was performed to determine if changes in the structural organization of the circular layer or in the density, distribution and ultrastructure of interstitial cells of Cajal (ICC) could account for this heterogeneity in electrical and mechanical activities. Light microscopy revealed that the structural organization of the circular muscle layer underwent dramatic morphological changes, from a tightly packed layer with poorly defined septa in the proximal rectum to one of discrete muscle bundles separated by large septae in the internal anal sphincter. Kit-immunohistochemistry revealed a dense network of ICC along the submucosal and myenteric borders in the rectum whereas in the IAS ICC were located along the periphery of muscle bundles within the circular layer. Changes in electrical activity within the circular muscle layer can be partially explained by changes in the structure of the muscle layer and changes in the distribution of ICC in the rectoanal region of the gastrointestinal tract.




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