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Related Concept Videos

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Spermidine alleviates cardiac aging by improving mitochondrial biogenesis and function.

Junying Wang1,2, Shaoqi Li1, Ju Wang1

  • 1Department of Pathophysiology, Harbin Medical University, Harbin, China.

Aging
|January 8, 2020
PubMed
Summary

Spermidine (SPD) supplementation combats cardiac aging by restoring polyamine levels and activating mitochondrial biogenesis. This process involves the SIRT1/PGC-1α pathway, improving heart function and reducing oxidative stress in aging hearts.

Keywords:
PGC-1αSIRT1mitochondrial biogenesispolyamine metabolismspermidine

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Area of Science:

  • Cardiovascular Biology
  • Mitochondrial Medicine
  • Aging Research

Background:

  • Aging is associated with reduced cardiac polyamine levels and impaired mitochondrial function.
  • Cardiovascular dysfunction in aging is linked to decreased mitochondrial biogenesis and activity.
  • Polyamines, like spermidine (SPD), are known to delay aging and offer cardiovascular protection.

Purpose of the Study:

  • To investigate if spermidine (SPD) can attenuate cardiac aging by activating mitochondrial biogenesis.
  • To explore the molecular mechanisms underlying SPD's effects on cardiac aging.
  • To assess SPD's potential for protecting against age-related cardiac deterioration.

Main Methods:

  • Assessed cardiac polyamine levels and myocardial ultrastructure in aged rats.
  • Supplemented aged rats with SPD for six weeks and analyzed cardiac function.
  • Utilized immunoblotting to examine key proteins in polyamine metabolism and mitochondrial biogenesis pathways (ODC, SSAT, SIRT1/PGC-1α).
  • Investigated SPD's effects on oxidative stress (ROS) and oxidative phosphorylation (OXPHOS) in senescent cardiomyocytes.
  • Conducted experiments involving inhibition of polyamine biosynthesis, SIRT1 activity, and PGC-1α knockdown.

Main Results:

  • Aged rats showed reduced cardiac polyamine levels, mitochondrial dysfunction, and altered expression of ODC, SSAT, SIRT1, PGC-1α, NRF1, NRF2, and TFAM.
  • SPD supplementation restored polyamine content, preserved myocardial structure, and improved mitochondrial function in aged rats.
  • SPD treatment in senescent cardiomyocytes decreased ROS production, enhanced OXPHOS performance, and increased expression of SIRT1, PGC-1α, NRF1, NRF2, and TFAM.
  • Inhibition of polyamine biosynthesis or SIRT1 activity negated SPD's beneficial effects.
  • PGC-1α knockdown confirmed SPD activates mitochondrial biogenesis via SIRT1-mediated deacetylation of PGC-1α.

Conclusions:

  • SPD supplementation effectively counteracts cardiac aging by restoring polyamine levels and promoting mitochondrial biogenesis.
  • The anti-aging effects of SPD in the heart are mediated through the SIRT1/PGC-1α signaling pathway.
  • SPD demonstrates potential as a therapeutic agent to prevent or treat age-related cardiac dysfunction.