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1 Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada
2 The John B. Pierce Laboratory & Department of Cellular and Molecular Physiology, Yale University, New Haven, CT, USA
3 Smooth Muscle Research Group & Department of Physiology and Biophysics, University of Calgary, Calgary, Alberta, Canada
Vascular cells communicate electrically to coordinate their activity and control tissue blood flow. To foster a quantitative understanding of this fundamental process, we developed a computational model that was structured to mimic a skeletal muscle resistance artery. Each endothelial cell and smooth muscle cell in our virtual artery was treated as the electrical equivalent of a capacitor coupled in parallel with a non-linear resistor representing ionic conductance; intercellular gap junctions were represented by ohmic resistors. Simulations revealed that the vessel wall is not a syncytium in which electrical stimuli spread equally to all constitutive cells. Indeed, electrical signals spread in a differential manner among and between endothelial cells and smooth muscle cells according to the initial stimulus. The predictions of our model agree with physiological data from the feed artery of the hamster retractor muscle. Cell orientation and coupling resistance were the principal factors that enable electrical signals to spread differentially along and between the two cell types. Our computational observations also illustrated how gap junctional coupling enables the vessel wall to filter and transform transient electrical events into sustained voltage responses. Functionally, differential electrical communication would permit discrete regions of smooth muscle activity to locally regulate blood flow and the endothelium to coordinate regional changes in tissue perfusion.
(Received 18 May 2005;
accepted after revision 5 July 2005;
first published online 7 July 2005)
Corresponding author D. G. Welsh: HMRB-G86, Heritage Medical Research Building, Faculty of Medicine, University of Calgary, 3330 Hospital Drive. N.W., Calgary, Alberta, Canada, T2N-4 N1. Email: dwelsh{at}ucalgary.ca
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