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Volume 271, Number 46, Issue of November 15, 1996 pp. 29162-29169
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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The Thrombin Receptor Is Present in Myoblasts and Its Expression Is Repressed upon Fusion

(Received for publication, July 26, 1996, and in revised form, August 29, 1996)

From the Friedrich Miescher-Institut and ^¶ Ciba Ltd., CH-4002 Basel, Switzerland

Cultured myoblasts derived from limb muscle of newborn rats express thrombin receptor immunoreactivity on their surface. Receptor expression is repressed upon myoblast fusion. This is due at least in part to a decrease in the amount of the thrombin receptor mRNA. Addition of thrombin triggers calcium transients only in mono- but not multinucleated muscle cells. Furthermore, thrombin increases the rate of myoblast proliferation that coincides with an activation of mitogen-activated protein kinase. Northern analysis of thrombin receptor mRNA expression in skeletal muscle showed that the transcript is present at a relatively high level at birth, but is almost undetectable in the adult. By in situ hybridization, the mRNA at birth appeared to be present mostly in mononucleated cells grouped in clusters, but not in muscle fibers. Very few nuclei surrounded by a mRNA signal were present on muscle sections of rats 24 days postnatally. These results suggest that the thrombin receptor plays a role in muscle development.

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