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Journal of Cell Science, Vol 102, Issue 3 643-652, Copyright © 1992 by Company of Biologists

JOURNAL ARTICLES

Formation of highly organized skeletal muscle fibers in vitro. Comparison with muscle development in vivo

S Swasdison and R Mayne
Department of Cell Biology, University of Alabama, Birmingham 35294.

Two methods were developed in which long-term cultures of quail skeletal muscle were established so that all of the muscle fibers develop in a highly oriented manner. The muscle fibers became spontaneously and vigorously contractile and established strong connections with the extracellular matrix at their ends that closely duplicate the structure of the myotendinous junction. A continuous basal lamina was formed around each muscle fiber that contained type IV collagen, laminin and heparan sulfate proteoglycan. With one of the methods, an extensive extracellular matrix developed around each muscle fiber that was highly organized with the formation of a distinctive epimysium, perimysium and endomysium. Analysis of the cultures by both methods for different isoforms of myosin showed expression of an adult form of myosin by some of the muscle cells. The results therefore demonstrate that muscle development in the present culture systems proceeds extensively for several weeks. It will now be possible to investigate directly the structure of the connections between muscle fibers and the extracellular matrix.


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© The Company of Biologists Ltd 1992