Document Detail


Autonomous differentiation in the mouse myogenic cell line, C2, involves a mutual positive control between insulin-like growth factor II and MyoD, operating as early as at the myoblast stage.
MedLine Citation:
PMID:  8907701     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
D Montarras; F Aurade; T Johnson; J IIan; F Gros; C Pinset
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cell science     Volume:  109 ( Pt 3)     ISSN:  0021-9533     ISO Abbreviation:  J. Cell. Sci.     Publication Date:  1996 Mar 
Date Detail:
Created Date:  1997-03-11     Completed Date:  1997-03-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0052457     Medline TA:  J Cell Sci     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  551-60     Citation Subset:  IM    
Affiliation:
Departement de Biologie Moleculaire, Institut Pasteur, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Base Sequence
Cell Differentiation / physiology
Cell Line
Down-Regulation
Embryonic and Fetal Development / physiology
Gene Expression Regulation, Developmental / physiology*
Insulin-Like Growth Factor II / physiology*
Mice
Molecular Sequence Data
Muscles / cytology*
MyoD Protein / genetics,  physiology*
RNA, Antisense*
Chemical
Reg. No./Substance:
0/MyoD Protein; 0/RNA, Antisense; 67763-97-7/Insulin-Like Growth Factor II

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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