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Muscle-specific programmed cell death 5 deletion attenuates cardiac aging.

Amber Naz1, Shasha Zhang1, Lin An1

  • 1Bio-X-Renji Hospital Research Center, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai 200127, China; Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, China.

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Summary

Programmed cell death 5 (PDCD5) deficiency alleviates cardiac aging in mice by reducing cellular senescence and apoptosis. This suggests PDCD5 is a novel regulator of heart aging and a potential therapeutic target.

Keywords:
ApoptosisCardiac agingCellular senescenceMitophagyPdcd5

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Area of Science:

  • Cardiovascular Biology
  • Aging Research
  • Molecular Biology

Background:

  • Programmed cell death 5 (PDCD5) is a known tumor suppressor gene.
  • The role of PDCD5 in cardiac aging is currently unknown.
  • PDCD5 levels increase in the aging heart.

Purpose of the Study:

  • To investigate the physiological function of PDCD5 in cardiac aging.
  • To determine if PDCD5 regulates age-related cardiac dysfunction.
  • To explore PDCD5 as a potential therapeutic target for cardiac aging.

Main Methods:

  • Generated muscle-specific PDCD5-deficient mice.
  • Assessed cardiac morphology and function in aged and young mice.
  • Analyzed cellular senescence markers, apoptosis, and mitochondrial quality (mitophagy).
  • Investigated the interaction between PDCD5 and p53.

Main Results:

  • PDCD5 deficiency attenuated age-related cardiac fibrosis and cardiomyocyte hypertrophy.
  • Reduced cellular senescence, apoptosis, and improved mitochondrial quality in aged hearts.
  • PDCD5 deficiency protected against doxorubicin-induced premature cardiac aging.
  • PDCD5 interacted with p53, suggesting a role in its regulation.

Conclusions:

  • PDCD5 deficiency attenuates cardiac aging by reducing cellular senescence and apoptosis.
  • Increased Parkin-mediated mitophagy and p53 interaction are key mechanisms.
  • PDCD5 is a novel regulator of cardiac aging and a potential therapeutic target.