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Published ahead of print on December 14, 2006, doi:10.1165/rcmb.2006-0096OC

Am. J. Respir. Cell Mol. Biol., Volume 36, Number 5, May 2007, 600-608

A more recent version of this article appeared on May 1, 2007
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Submitted on March 2, 2006
Revised on December 12, 2006

Acetylcholine-Induced Asynchronous Calcium Waves in Intact Human Bronchial Muscle Bundle

Jiazhen M Dai1, Kuo-Hsing Kuo1, Joyce M Leo1, Peter D Pare1, Cornelis van Breemen1*, and Cheng-Han Lee1

1 The James Hogg iCAPTURE Center for Cardiovascular and Plumonary Research, University of British Columbia, St. Paul's Hospital, Vancouver, BC, Canada

* To whom correspondence should be addressed. E-mail: breemen{at}interchange.ubc.ca.

Calcium (Ca2+) is an important activator of the contractile machinery in airway smooth muscle (ASM). While agonist-induced Ca2+ signals are well characterized in animal ASM, little is known about what occurs in adult human ASM. In this study, we examined the Ca2+ signal elicited by acetylcholine (ACh) in smooth muscle cells of the intact human bronchial muscle strips obtained from fresh surgical specimens in relation to muscle contraction. We found that ACh induces repetitive Ca2+ waves that spread along the longitudinal axis of individual cells in the intact human bronchial smooth muscle strips. These Ca2+ waves display no apparent synchronization between neighbouring cells, and their generation precedes force development. Comparison of the ACh concentration dependence of tissue contraction and selected parameters of the asynchronous Ca2+ waves (ACW) reveals that the graded force generation by ACh-stimulated human bronchial muscle strips is achieved by differential recruitment of cells to initiate Ca2+ waves and by enhancement of the frequency of ACW once the cells are recruited. Furthermore, pharmacologic characterization shows that the ACW are produced by repetitive cycles of SR Ca2+ release via ryanodine-sensitive channels followed by SR Ca2+ reuptake by sarco(endo)plasmic reticulum Ca2+ ATPase. Extracellular Ca2+ entry involving L-type voltage gated Ca2+ channels, receptor-operated channels/store-operated channels, and reverse-mode Na+/Ca2+ exchange is required to maintain the ACW. These findings for the first time demonstrate the occurrence and the role of ACW in excitation-contraction coupling in adult human airway smooth muscle.




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