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J Appl Physiol 86: 5-15, 1999;
8750-7587/99 $5.00
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Vol. 86, Issue 1, 5-15, January 1999

Influence of intercellular tissue connections on airway muscle mechanics

R. A. Meiss

Indiana University School of Medicine, Indianapolis, Indiana 46202

Contraction of smooth muscle in visceral organs is modified by structures external to the muscle. Within muscle tissue itself, connective tissue plays an important role in force transference among the contractile cells. Connections arranged radially can affect contractile mechanics by limiting tissue expansion at short lengths. Previous work suggests that increased stiffness at extreme shortening is due to such radial constraints. Two approaches to further study of these effects are reported. To increase radial constraints, very thin Silastic bands were placed loosely about strips of canine trachealis muscle at rest length. The strips were allowed to shorten under light afterloads, expanding until restrained by the bands. Subsequent removal of the bands allowed increased shortening, with less increase in stiffness at short lengths. Related isometric effects were observed. To reduce constraints, muscle strips were partially digested with collagenase. Compared with control conditions, this treatment permitted further shortening, with less increase in stiffness at short lengths. These results emphasize the role of extracellular structures in determining mechanical function of smooth muscle.

stiffness; smooth muscle contraction; tracheal muscle; shortening; connective tissue


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