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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

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Muscular dystrophy in PTFR/cavin-1 null mice.

Shi-Ying Ding¹, Libin Liu¹, Paul F Pilch^1,2

¹Department of Biochemistry.

|March 15, 2017

Summary

Mice lacking polymerase I transcription release factor (PTRF/cavin-1) developed muscular dystrophy, showing muscle hypertrophy, fibrosis, and impaired function. This PTRF/cavin-1 deficiency model offers insights into human muscular dystrophy and potential therapies.

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Area of Science:

Cell Biology
Molecular Biology
Physiology

Background:

Polymerase I transcription release factor (PTRF), also known as cavin-1, is crucial for caveolae formation.
Deficiency in PTRF/cavin-1 is linked to lipo- and muscular dystrophy in humans and mice.

Purpose of the Study:

To elucidate the molecular mechanisms underlying the muscle-specific phenotype in PTRF/cavin-1 null mice.
To characterize the muscular dystrophy resulting from PTRF/cavin-1 absence.

Main Methods:

Phenotypic analysis of PTRF/cavin-1 null mice.
Molecular characterization of muscle tissue, including protein expression and pathway analysis.
Assessment of mitochondrial function and exercise capacity.

Main Results:

PTRF/cavin-1 null mice exhibited reduced exercise capacity, muscle hypertrophy, and increased fiber size.
Constitutive activation of the Akt pathway, muscle fibrosis, and impaired membrane integrity were observed.
Decreased mitochondrial function, oxygen consumption, and altered myofiber composition were noted.
Compensatory activation of the dystrophin-glycoprotein complex and elevated muscle repair proteins were present.

Conclusions:

Absence of PTRF/cavin-1 induces a unique muscular dystrophy in mice, mirroring the human condition.
This mouse model provides valuable insights into muscular dystrophy pathogenesis and potential therapeutic strategies.