Expression and activity of serum response factor is required for expression of the muscle-determining factor MyoD in both dividing and differentiating mouse C2C12 myoblasts

Mol Biol Cell. 1996 May;7(5):719-29. doi: 10.1091/mbc.7.5.719.

Abstract

To understand the mechanism by which the serum response factor (SRF) is involved in the process of skeletal muscle differentiation, we have assessed the effect of inhibiting SRF activity or synthesis on the expression of the muscle-determining factor MyoD. Inhibition of SRF activity in mouse myogenic C2C12 cells through microinjection of either the SRE oligonucleotide (which acts by displacing SRF proteins from the endogenous SRE sequences), purified SRF-DB (a 30-kDa portion of SRF containing the DNA-binding domain of SRF, which acts as a dominant negative mutant in vivo), or purified anti-SRF antibodies rapidly prevents the expression of MyoD. Moreover, the rapid shutdown of MyoD expression after in vivo inhibition of SRF activity is observed not only in proliferating myoblasts but also in myoblasts cultured under differentiating conditions. Additionally, by using a cellular system expressing a glucocorticoid-inducible antisense-SRF (from aa 74 to 244) we have shown that blocking SRF expression by dexamethasone induction of antisense SRF results in the lack of MyoD expression as probed by both immunofluorescence and Northern blot analysis. Taken together these data demonstrate that SRF expression and activity are required for the expression of the muscle-determining factor MyoD.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies / pharmacology
  • Cell Differentiation / drug effects
  • Cell Division / drug effects
  • Cell Line
  • Cloning, Molecular
  • DNA-Binding Proteins / antagonists & inhibitors
  • DNA-Binding Proteins / metabolism*
  • Dexamethasone / pharmacology
  • Fluorescent Antibody Technique, Indirect
  • Mice
  • Microscopy, Confocal
  • Muscle Fibers, Skeletal / cytology*
  • MyoD Protein / immunology
  • MyoD Protein / metabolism*
  • Nuclear Proteins / antagonists & inhibitors
  • Nuclear Proteins / metabolism*
  • Oligonucleotides / pharmacology
  • Oligonucleotides, Antisense / pharmacology
  • Serum Response Factor
  • Transcription Factors / antagonists & inhibitors
  • Transcription Factors / metabolism

Substances

  • Antibodies
  • DNA-Binding Proteins
  • MyoD Protein
  • Nuclear Proteins
  • Oligonucleotides
  • Oligonucleotides, Antisense
  • Serum Response Factor
  • Transcription Factors
  • Dexamethasone