The contractile apparatus of airway smooth muscle. Biophysics and biochemistry.

Abstract:

:Qualitatively the mechanical, structural, and biochemical properties of airway smooth muscles resemble those of all other smooth muscle. However, one important distinguishing feature of airway smooth muscle is that the major portion of isotonic shortening is completed within the first 3 s in a muscle whose contraction is 10 s. This indicates the importance of focusing on the changes that occur in these 3 s and also the limiting role of the maximum velocity of shortening in determining shortening data. There is evidence that the maximum capacity and velocity of shortening in human bronchial smooth muscle from patients with asthma are significantly greater than those obtained from healthy siblings. In the demonstration in which cells in culture are arrested by withdrawing all fetal calf serum, the cells alter their phenotype to cells that are very long (more than 200 micrometers) and shorten twice as much as cells freshly isolated when the tissue is new. Speculatively, if such cells developed in vivo they could account for the increased contractility of asthmatic airway smooth muscle. These cultured cells could also be excellent models for study of airway smooth muscle contractility.

authors

Stephens NL,Li W,Wang Y,Ma X

doi

10.1164/ajrccm.158.supplement_2.13tac300

subject

Has Abstract

pub_date

1998-11-01 00:00:00

pages

S80-94

issue

5 Pt 3

eissn

1073-449X

issn

1535-4970

journal_volume

158

pub_type

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