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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
09:39

Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

Published on: July 29, 2016

The small muscle-specific protein Csl modifies cell shape and promotes myocyte fusion in an insulin-like growth

S Palmer1, N Groves, A Schindeler

  • 1Victor Chang Cardiac Research Institute, 384 Victoria Street, Darlinghurst, NSW 2010, Australia.

The Journal of Cell Biology
|May 31, 2001
PubMed

Insights

The Chisel (Csl) protein, a Nkx2-5 target, influences muscle cell shape and migration. While Csl disruption showed no phenotype, its ectopic expression impacts cell behavior and fusion, particularly with IGF-1.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Muscle Physiology

Background:

  • The cardiac homeodomain factor Nkx2-5 regulates cardiac gene expression.
  • Understanding transcriptional targets of Nkx2-5 is crucial for cardiac development and function.

Purpose of the Study:

  • To identify and characterize novel transcriptional targets of Nkx2-5.
  • To investigate the function of the newly identified protein, Chisel (Csl), in muscle cells.

Main Methods:

  • Murine cDNA screening to identify Nkx2-5 targets.
  • Expression analysis of Csl transcripts and protein in various muscle tissues.
  • Targeted gene disruption and ectopic expression studies in C2C12 myoblasts.
  • Cell migration, differentiation, fusion, and transcription factor activity assays.

Main Results:

  • Isolated a murine cDNA encoding the 9-kD Chisel (Csl) protein as an Nkx2-5 transcriptional target.
  • Csl transcripts detected in cardiac and smooth/skeletal muscles; protein localized to the cytoskeleton.
  • Targeted Csl disruption yielded no overt phenotype.
  • Ectopic Csl expression induced lamellipodia, retarded migration, and enhanced IGF-1-dependent myoblast fusion into dysmorphogenic myosacs.
  • Enhanced activity of NFAT and MEF2 transcription factors in an IGF-1 signaling-dependent manner.

Conclusions:

  • Csl exhibits dynamic cytoskeletal localization and significantly impacts muscle cell shape, migration, and fusion.
  • Csl plays a role in the regulatory network coordinating muscle cell structural and functional states during growth, adaptation, and repair.
  • IGF-1 signaling potentiates Csl's effects on myoblast fusion and transcription factor activity.

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