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Immunometabolism in the Aging Heart.

Kranti A Mapuskar1,2, Barry London2,3, Zeb R Zacharias2,4

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Cardiac aging involves complex interactions between immune signaling and cellular metabolism, known as immunometabolism. Understanding these pathways is key to developing therapies for age-related heart dysfunction and cardiotoxicity.

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Area of Science:

  • Cardiovascular Science
  • Immunology
  • Metabolic Biology

Background:

  • Cardiac aging is characterized by structural, functional, and molecular changes.
  • These changes are influenced by the interplay between immune signaling and cellular metabolism (immunometabolism).
  • An aging population faces increased cardiovascular risk and cancer incidence, highlighting the need to understand cardiac aging.

Purpose of the Study:

  • To review the crosstalk between cellular metabolic pathways and immune processes in cardiac aging.
  • To explore how aging alters the heart's immune environment, affecting immune cell metabolism, mitochondrial function, and redox signaling.
  • To identify therapeutic strategies targeting the immunometabolic axis for cardiac health.

Main Methods:

  • Literature review of studies on cardiac aging, immunometabolism, and therapeutic interventions.
  • Analysis of metabolic pathways (glycolysis, oxidative phosphorylation, fatty acid metabolism) in the context of cardiac aging.
  • Examination of immune cell metabolism, mitochondrial dysfunction, and redox signaling in the aging heart.

Main Results:

  • Aging drives changes in immune cell metabolism, mitochondrial dysfunction, and redox signaling, exacerbating inflammation and impairing repair.
  • Metabolic shifts in the aging heart accelerate functional decline and create a vicious cycle of inflammation.
  • Cancer therapies can worsen cardiotoxicity in aging hearts due to pre-existing immunometabolic disruptions.

Conclusions:

  • Targeting the immunometabolic axis offers potential therapies for cardiac aging pathologies.
  • Interventions include modulating metabolic intermediates, enhancing mitochondrial function, and utilizing immune signaling pathways.
  • Advances in immunometabolism research can translate preclinical findings into improved quality of life for the aging population.