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Niloofar Ale-Agha1, Philipp Jakobs1, Christine Goy1,2

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Summary
This summary is machine-generated.

Mitochondrial telomerase reverse transcriptase (TERT) protects the heart from injury by improving mitochondrial function and reducing infarct size. Increasing mitochondrial TERT may offer a new therapeutic approach for cardioprotection.

Keywords:
mice, transgenicmitochondriamyocardial ischemiamyofibroblastsreperfusion injurytelomerase

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Area of Science:

  • Cardiovascular Biology
  • Mitochondrial Medicine
  • Telomere Biology

Background:

  • Telomerase reverse transcriptase (TERT) has known cardiovascular protective functions.
  • TERT localizes to both the nucleus and mitochondria, but its specific roles in each compartment are unclear.
  • Existing research lacks tools to differentiate nuclear vs. mitochondrial TERT functions.

Purpose of the Study:

  • To elucidate the distinct roles of nuclear and mitochondrial TERT in cardiovascular protection.
  • To investigate the impact of mitochondrial TERT on cardiac function and injury response.
  • To explore the therapeutic potential of targeting mitochondrial TERT.

Main Methods:

  • Generated novel mouse models with exclusive mitochondrial (mitoTERT) or nuclear (nucTERT) TERT expression.
  • Assessed outcomes following ischemia/reperfusion injury.
  • Evaluated mitochondrial respiration, cardiomyocyte apoptosis, myofibroblast differentiation, and endothelial cell function.
  • Analyzed mitochondrial complex I subunit composition.

Main Results:

  • Mitochondrial TERT (mitoTERT) enhanced cardiac mitochondrial respiration and reduced infarct size and ejection fraction decline post-ischemia/reperfusion.
  • Nuclear TERT (nucTERT) did not confer protection and TERT deficiency impaired mitochondrial respiration.
  • mitoTERT improved cardiomyocyte survival, myofibroblast differentiation, and endothelial cell migration.
  • TERT was found in human heart mitochondria and increased by ischemic preconditioning.

Conclusions:

  • Mitochondrial TERT, not nuclear TERT, is crucial for mitochondrial respiration and protection against ischemia/reperfusion injury.
  • Mitochondrial TERT enhances complex I function and confers cardioprotection.
  • Elevating mitochondrial TERT levels presents a promising therapeutic strategy for cardiovascular diseases.