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First published online 30 January 2007
doi: 10.1242/jcs.03371

Journal of Cell Science 120, 670-681 (2007)
Published by The Company of Biologists 2007
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Research Article

IL-13 mediates the recruitment of reserve cells for fusion during IGF-1-induced hypertrophy of human myotubes

Virginie Jacquemin, Gillian Sandra Butler-Browne, Denis Furling* and Vincent Mouly*,{ddagger}

UMR S 787, Inserm/UPMC-Paris 6, Institut de Myologie, Paris, France

{ddagger} Author for correspondence (e-mail: mouly{at}ext.jussieu.fr)

Accepted 7 December 2006

Insulin-like growth factor-1 (IGF-1) has been shown to induce skeletal muscle hypertrophy, to prevent the loss of muscle mass with ageing and to improve the muscle phenotype of dystrophic mice. We previously developed a model of IGF-1-induced hypertrophy of human myotubes, in which hypertrophy was not only characterized by an increase in myotube size and myosin content but also by an increased recruitment of reserve cells for fusion. Here, we describe a new mechanism of IGF-1-induced hypertrophy by demonstrating that IGF-1 signals exclusively to myotubes but not to reserve cells, leading, under the control of the transcription factor NFATc2, to the secretion of IL-13 that will secondly recruit reserve cells for differentiation and fusion. In addition, we show that IGF-1 also signals to myotubes to stimulate protein metabolism via Akt by (1) activating the mTOR-p70S6K-S6 pathway and inhibiting GSK-3beta, both involved in the control of protein translation, and (2) inhibiting the Foxo1–atrogin-1 protein degradation pathway.

Key words: Insulin-like growth factor-1 (IGF-1), Skeletal muscle, Hypertrophy, Fusion, Reserve cells, IL-13


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