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Mitochondrial fission and mitophagy depend on cofilin-mediated actin depolymerization activity at the mitochondrial

Guo-Bing Li1,2, Hong-Wei Zhang1, Ruo-Qiu Fu1

  • 1College of Pharmacy, Third Military Medical University, Chongqing, China.

Oncogene
|January 12, 2018
PubMed

Insights

Cofilin regulates mitochondrial fission and mitophagy by controlling actin dynamics at fission sites. This actin-depolymerizing activity is crucial for these cellular processes, impacting cancer progression.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Mitochondrial fission and mitophagy are vital for cellular health and implicated in cancer.
  • Actin is involved in regulating mitochondrial dynamics, but cofilin's precise role is unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism of cofilin in regulating mitochondrial fission and mitophagy.
  • To investigate cofilin's role in PINK1/PARK2-dependent mitophagy and its interaction with actin.

Main Methods:

  • Knockdown and overexpression of cofilin in cellular models.
  • Induction of mitochondrial fission and mitophagy using staurosporine (STS), etoposide (ETO), and carbonyl cyanide 3-chlorophenylhydrazone (CCCP).
  • Analysis of actin dynamics, mitochondrial proteases, and mitochondrial membrane potential.

Main Results:

  • Cofilin knockdown attenuated, while overexpression potentiated, mitochondrial fission and mitophagy.
  • Cofilin regulates PTEN-induced putative kinase 1 (PINK1) accumulation via mitochondrial proteases (MPPβ, PARL, AFG3L2).
  • G-actin translocates to mitochondria, and cofilin's actin-depolymerizing activity at fission sites is essential for fission and mitophagy.

Conclusions:

  • Cofilin plays a critical role in orchestrating mitochondrial fission and mitophagy.
  • Actin dynamics, specifically cofilin-mediated depolymerization, are key to initiating these mitochondrial processes.
  • Understanding this mechanism offers potential therapeutic strategies for cancer.

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