Tissue-specific mathematical models of slow wave entrainment in wild-type and 5-HT(2B) knockout mice with altered interstitial cells of Cajal networks.

Du P, O'Grady G, Gibbons SJ, Yassi R, Lees-Green R, Farrugia G, Cheng LK, Pullan AJ
Biophys J. 2010 98 (9): 1772-81

PMID: 20441740 · PMCID: PMC2862206 · DOI:10.1016/j.bpj.2010.01.009

Gastrointestinal slow waves are generated within networks of interstitial cells of Cajal (ICCs). In the intact tissue, slow waves are entrained to neighboring ICCs with higher intrinsic frequencies, leading to active propagation of slow waves. Degradation of ICC networks in humans is associated with motility disorders; however, the pathophysiological mechanisms of this relationship are uncertain. A recently developed biophysically based mathematical model of ICC was adopted and updated to simulate entrainment of slow waves. Simulated slow wave propagation was successfully entrained in a one-dimensional model, which contained a gradient of intrinsic frequencies. Slow wave propagation was then simulated in tissue models which contained a realistic two-dimensional microstructure of the myenteric ICC networks translated from wild-type (WT) and 5-HT(2B) knockout (degraded) mouse jejunum. The results showed that the peak current density in the WT model was 0.49 muA mm(-2) higher than the 5-HT(2B) knockout model, and the intracellular Ca(2+) density after 400 ms was 0.26 mM mm(-2) higher in the WT model. In conclusion, tissue-specific models of slow waves are presented, and simulations quantitatively demonstrated physiological differences between WT and 5-HT(2B) knockout models. This study provides a framework for evaluating how ICC network degradation may impair slow wave propagation and ultimately motility and transit.

Copyright (c) 2010 Biophysical Society. Published by Elsevier Inc. All rights reserved.

MeSH Terms (12)

Animals Biophysical Phenomena Gastrointestinal Tract Interstitial Cells of Cajal Intestine, Small Kinetics Mice Mice, Knockout Models, Biological Myenteric Plexus Organ Specificity Receptor, Serotonin, 5-HT2B

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