Related Experiment Video

Updated: Feb 22, 2026

Time-Lapse Video Microscopy for Assessment of EYFP-Parkin Aggregation as a Marker for Cellular Mitophagy
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Time-Lapse Video Microscopy for Assessment of EYFP-Parkin Aggregation as a Marker for Cellular Mitophagy

Published on: May 4, 2016

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Parkin-Independent Mitophagy Controls Chemotherapeutic Response in Cancer Cells

Elodie Villa1, Emma Proïcs1, Camila Rubio-Patiño1

  • 1Université Côte d'Azur, INSERM, C3M, Nice, France.

Cell Reports
|September 21, 2017
PubMed

Insights

Researchers discovered ARIH1, an E3 ubiquitin ligase, triggers mitophagy in cancer cells. This process degrades damaged mitochondria and promotes resistance to chemotherapy, challenging previous views on mitophagy regulation in cancer.

Area of Science:

  • Cellular Biology
  • Molecular Oncology
  • Autophagy Research

Background:

  • Mitophagy, the selective degradation of damaged mitochondria, is crucial for cellular health.
  • Dysfunctional mitophagy is linked to various diseases, particularly cancer.
  • Key mitophagy regulators are often inactivated in cancer, obscuring regulatory mechanisms.

Purpose of the Study:

  • To elucidate the mechanisms governing mitophagy in cancer cells.
  • To identify novel regulators of mitophagy in the context of cancer pathology.

Main Methods:

  • Identification of E3 ubiquitin ligase ARIH1/HHARI as a mitophagy regulator.
  • Investigation of ARIH1's role in PINK1-dependent mitophagy.
  • Analysis of ARIH1 expression in cancer cell lines and patient tissues.

Main Results:

  • ARIH1/HHARI was identified as an E3 ubiquitin ligase that induces mitophagy in cancer cells.
  • ARIH1 mediates the polyubiquitination of damaged mitochondria, facilitating their autophagic clearance.
  • ARIH1 is broadly expressed in cancer cells, including breast and lung adenocarcinomas.
  • ARIH1 expression confers protection against chemotherapy-induced cell death.

Conclusions:

  • ARIH1-mediated mitophagy promotes therapeutic resistance in cancer.
  • ARIH1 challenges the paradigm of mitophagy regulators solely acting as tumor suppressors.
  • Understanding ARIH1's role is critical for developing novel cancer therapies.
Keywords:
ARIH1E3 ligasePINK1Parkin-independentRBR-ligasecell deathchemoresistancelung cancermitophagymtKeima

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