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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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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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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Aging01:26

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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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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Related Experiment Video

Updated: Nov 5, 2025

Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle
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Mitochondrial Dysfunction Contributes to Aging-Related Atrial Fibrillation.

Chuanbin Liu1,2, Jing Bai1, Qing Dan3

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|May 19, 2021
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Summary

Shorter leukocyte telomere length (LTL) and lower PGC-1α levels are linked to aging-related atrial fibrillation (AF). Mitochondrial dysfunction may contribute to AF development in older adults.

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Area of Science:

  • Gerontology
  • Cardiology
  • Mitochondrial Biology

Background:

  • Atrial fibrillation (AF) incidence rises with age, a process associated with telomere shortening.
  • The precise mechanisms linking aging to increased AF risk, including the role of telomere length and mitochondrial function, remain unclear.

Purpose of the Study:

  • To investigate the correlation between telomere length, mitochondrial dysfunction, and aging-related atrial fibrillation.
  • To explore the potential role of PGC-1α and mitochondrial membrane potential (MMP) in AF pathogenesis.

Main Methods:

  • Recruited 96 elderly male AF patients and 96 age- and gender-matched controls.
  • Assessed anthropometric, clinical, and laboratory parameters, including leukocyte telomere length (LTL) and serum PGC-1α levels.
  • Measured mitochondrial membrane potential (MMP) in peripheral blood leukocytes as an indicator of mitochondrial function.

Main Results:

  • AF patients exhibited significantly shorter LTL (P < 0.001) and lower serum PGC-1α levels compared to controls.
  • In subjects without comorbidities, AF patients showed lower MMP.
  • Multivariate logistic regression revealed LTL (OR 0.365) and serum PGC-1α (OR 0.993) were inversely associated with AF presence.
  • ROC analysis suggested diagnostic value for LTL (AUC 0.734) and PGC-1α (AUC 0.633).

Conclusions:

  • Leukocyte telomere length (LTL) and serum PGC-1α are inversely correlated with aging-related AF.
  • Mitochondrial dysfunction, indicated by reduced MMP and PGC-1α levels, appears to play a role in the development of AF in the elderly.