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Isolation and Quantitative Immunocytochemical Characterization of Primary Myogenic Cells and Fibroblasts from Human Skeletal Muscle
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Rbf Activates the Myogenic Transcriptional Program to Promote Skeletal Muscle Differentiation

Maria Paula Zappia1, Alice Rogers1, Abul B M M K Islam2

  • 1Department of Biochemistry and Molecular Genetics, University of Illinois at Chicago, 900 S. Ashland Avenue, Chicago, IL 60607, USA.

Cell Reports
|January 17, 2019
PubMed

Insights

The retinoblastoma tumor suppressor protein homolog Rbf (Retinoblastoma protein) is crucial for adult skeletal muscle growth and differentiation. Unexpectedly, Rbf activates myogenic genes, revealing a novel role beyond cell cycle control.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Muscle Physiology

Background:

  • The retinoblastoma tumor suppressor protein (pRB) is vital for cell cycle regulation.
  • Its role in animal development, particularly in differentiation, is less understood.
  • Rbf is the Drosophila homolog of pRB.

Purpose of the Study:

  • To investigate the function of Rbf in adult skeletal muscle development in Drosophila.
  • To elucidate the molecular mechanisms underlying Rbf's role in muscle differentiation.

Main Methods:

  • Depletion of Rbf in Drosophila adult skeletal muscles.
  • Analysis of muscle growth and myofibrillogenesis.
  • Identification of Rbf-dependent transcriptional programs using genomic approaches.
  • Investigating genetic interactions with Rbf.

Main Results:

  • Rbf depletion severely impaired muscle growth and myofibrillogenesis.
  • Myoblast proliferation was minimally affected by Rbf depletion.
  • An Rbf-dependent transcriptional program distinct from cell cycle control was identified in late muscle development.
  • Rbf functions as a transcriptional activator for myogenic and metabolic genes.

Conclusions:

  • Rbf plays a critical, previously unrecognized role in activating the myogenic transcriptional program during late muscle differentiation.
  • This function is distinct from its canonical role in cell cycle control.
  • Rbf directly drives skeletal muscle growth and differentiation.
Keywords:
DrosophilaE2FRbfdevelopmentdifferentiationgrowthmusclemyogenesispRBtranscriptional program

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