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Journal of Histochemistry and Cytochemistry, Vol. 50, 1579-1589, December 2002, Copyright © 2002, The Histochemical Society, Inc.

ARTICLE

In Vivo Activation of STAT3 Signaling in Satellite Cells and Myofibers in Regenerating Rat Skeletal Muscles

Katsuya Kamia and Emiko Senbab
a Department of Health Science, Osaka University of Health and Sport Sciences, Wakayama, Japan
b Osaka, Japan, and Department of Anatomy and Neurobiology, Wakayama Medical University, Wakayama, Japan

Correspondence to: Katsuya Kami, Dept. of Health Science, Osaka Univ. of Health and Sport Sciences, Asashirodai 1-1, Kumatori-cho, Sennan-gun, Osaka 590-0496, Japan. E-mail: kami@ouhs.ac.jp

Although growth factors and cytokines play critical roles in skeletal muscle regeneration, intracellular signaling molecules that are activated by these factors in regenerating muscles have been not elucidated. Several lines of evidence suggest that leukemia inhibitory factor (LIF) is an important cytokine for the proliferation and survival of myoblasts in vitro and acceleration of skeletal muscle regeneration. To elucidate the role of LIF signaling in regenerative responses of skeletal muscles, we examined the spatial and temporal activation patterns of an LIF-associated signaling molecule, the signal transducer and activator transcription 3 (STAT3) proteins in regenerating rat skeletal muscles induced by crush injury. At the early stage of regeneration, activated STAT3 proteins were first detected in the nuclei of activated satellite cells and then continued to be activated in proliferating myoblasts expressing both PCNA and MyoD proteins. When muscle regeneration progressed, STAT3 signaling was no longer activated in differentiated myoblasts and myotubes. In addition, activation of STAT3 was also detected in myonuclei within intact sarcolemmas of surviving myofibers that did not show signs of necrosis. These findings suggest that activation of STAT3 signaling is an important molecular event that induces the successful regeneration of injured skeletal muscles. (J Histochem Cytochem 50:1579–1589, 2002)

Key Words: STAT3, MyoD, PCNA, satellite cell, muscle regeneration


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