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Autophagy deficiency exacerbated hypoxia-reoxygenation induced inflammation and cell death via a mitochondrial

Eddie Tam1, Erfei Song2, Nina Noskovicova3

  • 1Department of Biology, York University, Toronto, Canada.

Life Sciences
|October 25, 2024
PubMed
Abstract

Insights

Autophagy deficiency worsens ischemia reperfusion (I/R) injury by increasing cell death and inflammation. Targeting the mtDNA/IRF3/STING pathway may offer new therapies for I/R injury.

Area of Science:

  • Cardiovascular Biology
  • Cellular Stress Response
  • Immunology

Background:

  • Autophagy is crucial for cellular homeostasis and protects against cardiovascular diseases like ischemia reperfusion (I/R) injury.
  • The precise mechanisms of autophagy's protective role in I/R injury need further elucidation.

Purpose of the Study:

  • To investigate the role of autophagy, specifically Atg7, in cardiomyocyte response to I/R injury.
  • To characterize the molecular pathways involved in autophagy-deficient cells during I/R injury.

Main Methods:

  • Utilized Atg7 knockout (AKO) mice and H9c2 cardiomyoblast cells subjected to I/R or hypoxia-reoxygenation (H/R) injury.
  • Assessed cell death, inflammation, mitochondrial dynamics, and the STING/IRF3 signaling pathway.

Main Results:

  • Atg7 knockout led to autophagy deficiency, increased cell death, and heightened sterile inflammation upon H/R.
  • Autophagy deficiency promoted mitochondrial fission, mtDNA release, and activation of the STING/IRF3 axis, resulting in elevated interferon-α.
  • AKO mice exhibited increased cell death and reduced anti-inflammatory gene expression post-I/R injury.

Conclusions:

  • Autophagy deficiency exacerbates I/R injury in cardiomyocytes through the mtDNA/IRF3/STING pathway.
  • Modulating this pathway presents a potential therapeutic strategy for preventing or treating I/R injury.
Keywords:
Atg7AutophagyCell deathHeartHypoxiaReoxygenation

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