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The Journal of Cell Biology, Vol 50, 172-186, Copyright © 1971 by Rockefeller University Press

ARTICLE

THE SMOOTH MUSCLE CELL

: II. Growth of Smooth Muscle in Culture and Formation of Elastic Fibers



Russell Ross 1

1 Department of Pathology, School of Medicine, University of Washington, Seattle, Washington 98105

Smooth muscle derived from the inner media and intima of immature guinea pig aorta were grown for up to 8 wk in cell culture. The cells maintained the morphology of smooth muscle at all phases of their growth in culture. After growing to confluency, they grew in multiple overlapping layers. By 4 wk in culture, microfibrils (110 A) appeared within the spaces between the layers of cells. Basement membrane-like material also appeared adjacent to the cells. Analysis of the microfibrils showed that they have an amino acid composition similar to that of the microfibrillar protein of the intact elastic fiber. These investigations coupled with the radioautographic observations of the ability of aortic smooth muscle to synthesize and secrete extracellular proteins demonstrate that this cell is a connective tissue synthetic cell.

Submitted on September 17, 1970
Revised on October 30, 1970


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