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Deficiency of the Bax gene attenuates denervation-induced apoptosis

P M Siu1, S E Alway

  • 1Laboratory of Muscle Biology and Sarcopenia, Division of Exercise Physiology, West Virginia University School of Medicine, Morgantown, West Virginia 26506, USA.

Apoptosis : an International Journal on Programmed Cell Death
|June 10, 2006
PubMed

Insights

Blocking the Bax gene, a key player in apoptosis, significantly reduced muscle wasting and DNA fragmentation in denervated mice. This suggests targeting apoptosis could treat muscle loss in neuromuscular disorders.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Physiology

Background:

  • Denervation-induced muscle wasting is a significant clinical problem.
  • Apoptosis, or programmed cell death, is a known contributor to this muscle loss.
  • The pro-apoptotic protein Bax plays a critical role in initiating apoptosis.

Purpose of the Study:

  • To investigate the role of the Bax gene in denervation-induced muscle wasting.
  • To determine if interfering with apoptosis can attenuate muscle atrophy during denervation.

Main Methods:

  • Utilized genetically modified mice lacking the pro-apoptotic Bax gene (Bax(-/-)) and wild-type littermates.
  • Induced denervation in hindlimb muscles of these mice.
  • Assessed muscle weight, DNA fragmentation, and levels of key apoptotic and oxidative stress markers.

Main Results:

  • Muscle wasting was reduced in Bax(-/-) mice compared to wild-type mice after denervation.
  • Apoptotic DNA fragmentation was significantly lower in denervated Bax(-/-) muscles.
  • Key apoptotic markers like caspase-3 and -9 activities, and mitochondrial release of cytochrome c were suppressed in Bax(-/-) mice.
  • Oxidative stress markers were elevated in wild-type but not in Bax(-/-) denervated muscles.

Conclusions:

  • The absence of the Bax gene suppresses pro-apoptotic signaling and attenuates muscle wasting during denervation.
  • Targeting apoptosis, specifically by inhibiting Bax, may be a viable therapeutic strategy for denervation-associated muscle atrophy.
  • These findings have implications for treating neuromuscular disorders involving muscle denervation.

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