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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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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
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The Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Heart Failure II: Pathophysiology01:29

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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Mitochondrial Dynamics in Aging Heart.

Pankaj Patyal1, Gohar Azhar1, Ambika Verma1

  • 1Donald W. Reynolds Department of Geriatrics and Institute on Aging, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.

Biomedicines
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

Aging hearts suffer mitochondrial dysfunction, leading to cardiovascular disease. This review explores how mitochondrial changes drive heart aging and discusses therapies to improve cardiac health span.

Keywords:
apoptosiscardiac aginginterventionsmitochondriamtDNAsirtuins

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Area of Science:

  • Cardiology
  • Mitochondrial Biology
  • Gerontology

Background:

  • Aging is a primary risk factor for cardiovascular disease, causing myocardial structural and functional decline.
  • Mitochondria are vital for cardiac energy production (ATP) and cellular homeostasis, but age-related dysfunction is common.
  • Mitochondrial alterations in aging hearts include morphological changes, reduced oxidative phosphorylation (OXPHOS), and increased reactive oxygen species (ROS).

Purpose of the Study:

  • To provide a comprehensive overview of mitochondrial remodeling in the aging myocardium.
  • To examine the mechanistic links between mitochondrial dysfunction and myocardial injury during aging.
  • To discuss emerging therapeutic strategies targeting mitochondrial health for cardiovascular aging.

Main Methods:

  • Narrative review of existing literature on cardiac aging and mitochondrial function.
  • Analysis of morphological and functional changes in aging cardiac mitochondria.
  • Examination of molecular pathways, including Serum Response Factor (SRF) signaling and NAD+ levels, impacting mitochondrial health.

Main Results:

  • Aging hearts exhibit mitochondrial fragmentation, disorganization, and reduced OXPHOS efficiency, leading to oxidative damage.
  • Disruptions in mitochondrial dynamics (fusion/fission) and impaired quality control exacerbate dysfunction.
  • Dysregulated SRF signaling and decreased NAD+ levels compromise mitochondrial adaptability and stress resilience, promoting cardiomyocyte loss and fibrosis.

Conclusions:

  • Mitochondrial dysfunction is a key driver and amplifier of cardiac aging, contributing to heart failure.
  • Therapeutic strategies targeting mitochondrial bioenergetics and quality control show promise for preserving cardiac function.
  • Interventions aimed at improving mitochondrial health could extend cardiovascular health span in aging populations.