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Caveolin-1 controls mitochondrial damage and ROS production by regulating fission - fusion dynamics and mitophagy

Ying Jiang1, Sarah Krantz2, Xiang Qin3

  • 1Departments of Pharmacology, University of Illinois at Chicago, Chicago, IL, 60612, USA; Center for Informational Biology, University of Electronic Science and Technology of China, 610054, China.

Redox Biology
|April 12, 2022
PubMed

Insights

Caveolin-1 phosphorylation regulates mitochondrial dynamics and mitophagy. This process is crucial for cancer cell survival, offering potential new therapeutic strategies.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Cancer Research

Background:

  • Mitochondrial dynamics and mitophagy are critical for cellular homeostasis and metabolic health.
  • Caveolin-1 (Cav-1) is a scaffolding protein involved in various cellular processes.

Purpose of the Study:

  • To investigate the role of caveolin-1 (Cav-1) phosphorylation at tyrosine 14 (Y14) in regulating mitochondrial dynamics and mitophagy.
  • To explore the impact of Cav-1 Y14 phosphorylation on MDA-MB-231 triple-negative breast cancer cells.

Main Methods:

  • Knockdown of Cav-1 and expression of Y14F and Y14D Cav-1 mutants in MDA-MB-231 cells.
  • Analysis of mitochondrial morphology, dynamics (fusion/fission), and mitophagy.
  • Investigation of Cav-1 interactions with mitochondrial proteins Mitofusin 2 (Mfn2) and Dynamin related protein 1 (Drp1).

Main Results:

  • Cav-1 knockdown and Y14F mutant altered mitochondrial morphology and increased mitochondrial dynamics and mitophagy.
  • The Y14D mutant enhanced Cav-1 interaction with Mfn2 and Drp1, preventing their mitochondrial translocation.
  • Limited Mfn2 recruitment to mitochondria diminished PINK1/Mfn2/Parkin complex formation, leading to damaged mitochondria and ROS accumulation.

Conclusions:

  • Cav-1 Y14 phosphorylation acts as a switch, preventing Mfn2 and Drp1 translocation and inhibiting mitophagy.
  • Phospho-Cav-1 plays a role in cancer cell survival by regulating mitochondrial quality control.
  • These findings suggest potential novel therapeutic strategies targeting Cav-1 phosphorylation in cancer treatment.
Keywords:
Cav-1Dynamin-related protein 1Mitochondrial dynamicsMitofusin 2MitophagymtROS

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