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Myostatin induces mitochondrial metabolic alteration and typical apoptosis in cancer cells

Y Liu1, H Cheng, Y Zhou

  • 1The State Key Laboratory of Biomembrane and Membrane Biotechnology, Chinese Academy of Sciences, Beijing, China.

Cell Death & Disease
|February 16, 2013
PubMed

Insights

Myostatin disrupts mitochondrial metabolism and induces apoptosis in cancer cells by altering glucose metabolism regulators Hexokinase II and VDAC1. This reveals a novel role for myostatin in cancer cell death.

Area of Science:

  • Cell Biology
  • Metabolic Regulation
  • Cancer Research

Background:

  • Myostatin, a TGF-β superfamily member, influences muscle glucose metabolism.
  • Dysregulated myostatin is linked to metabolic disorders like obesity and type II diabetes.
  • Cancer cells often rely on glycolysis, making them potentially vulnerable to metabolic interventions.

Purpose of the Study:

  • To investigate myostatin's role in mitochondrial metabolism and apoptosis in cancer cells.
  • To elucidate the molecular mechanisms underlying myostatin-induced apoptosis.
  • To identify key regulators involved in myostatin's effects on glucose metabolism and cell death.

Main Methods:

  • Analysis of mitochondrial metabolic alterations induced by myostatin.
  • Assessment of protein levels and localization of Hexokinase II (HKII) and VDAC1.
  • Investigation of Bax translocation and apoptosis using knockdown and rescue experiments.
  • Measurement of ATP levels and HKII expression for functional rescue.

Main Results:

  • Myostatin induced significant mitochondrial metabolic changes and apoptosis in glycolysis-addicted cancer cells.
  • A negative correlation was observed between HKII and VDAC1 protein levels.
  • VDAC1 upregulation and HKII downregulation/mitochondrial dissociation were noted in myostatin-sensitive cells.
  • Myostatin promoted Bax translocation to mitochondria, which was inhibited by VDAC1 knockdown.
  • Apoptosis could be partially rescued by ATP repletion or HKII re-expression.

Conclusions:

  • Myostatin plays a novel role in regulating mitochondrial metabolism and apoptosis in cancer cells.
  • Perturbation of mitochondrial metabolism by myostatin is causally linked to cancer cell apoptosis.
  • VDAC1 and HKII are critical mediators of myostatin-induced apoptosis, highlighting potential therapeutic targets.

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