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Journal of Cell Science, Vol 109, Issue 3 551-560, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
D Montarras, F Aurade, T Johnson, J IIan, F Gros and C Pinset
Departement de Biologie Moleculaire, Institut Pasteur, Paris, France.
We have studied the contribution of the endogenous production of insulin-like growth factor II (IGFII) and of the muscle regulatory factor, MyoD, to the autonomy of differentiation in isolated skeletal myoblasts. Inhibition of MyoD and IGFII gene expression in myoblasts of the mouse myogenic cell line, C2, was achieved by transfection and selection of stably transfected cells (anti-MyoD and anti-IGFII cells) with vectors producing MyoD or IGFII antisense RNA. We observed that inhibiting either MyoD or IGFII has multiple and similar consequences. In addition to the inhibition of the target gene, expression of MyoD transcripts in anti-IGFII myoblasts and expression of IGFII in anti-MyoD myoblasts were also abolished, whereas accumulation of transcripts for the muscle regulatory factor, Myf5, was markedly increased in both cell types. However, despite this Myf5 up-regulation, both anti-IGFII and anti-MyoD myoblasts lost the ability to undergo autonomous differentiation (differentiation in the absence of added IGF), further indicating that Myf5 and MyoD are not strictly interchangeable. Additional evidence of a link between MyoD and IGFII was obtained: (1) forced expression of the MyoD cDNA stimulated IGFII gene expression, and (2) treatment of C2 myoblasts with fibroblast growth factor, not only diminished MyoD expression and compromised differentiation as previously shown by others, but also abolished IGFII expression. These experiments showing loss or gain of function argue in favor of a mutual positive control between IGFII and MyoD operating as early as the myoblast stage.
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