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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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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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Aging01:26

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle
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Age-Associated Mitochondrial Dysfunction Accelerates Atherogenesis.

Daniel J Tyrrell1, Muriel G Blin1, Jianrui Song1

  • 1From the Department of Internal Medicine (D.J.T., M.G.B., J.S., S.C.W., D.R.G.), University of Michigan, Ann Arbor.

Circulation Research
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Summary
This summary is machine-generated.

Aging primes blood vessels for atherosclerosis by increasing inflammation and impairing mitochondrial function, even before high cholesterol develops. This makes older individuals more susceptible to the disease.

Keywords:
agingatherosclerosiscardiovascular diseaseshyperlipidemiasmitochondria

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Area of Science:

  • Cardiovascular Science
  • Aging Research
  • Mitochondrial Biology

Background:

  • Aging is a primary risk factor for atherosclerosis.
  • The independent role of vascular aging in atherogenesis, separate from hyperlipidemia, remains unclear.

Purpose of the Study:

  • To investigate if vascular aging exacerbates atherosclerosis development before the onset of hyperlipidemia.
  • To elucidate the mechanisms linking aging, mitochondrial dysfunction, and inflammation in the aorta.

Main Methods:

  • Analysis of aortas from young and aged normolipidemic mice.
  • Induction of acute hyperlipidemia in mice using a western diet and LDL receptor degradation.
  • Genetic manipulation of autophagy in smooth muscle cells.
  • Intervention with spermidine to enhance mitophagy in aged mice.

Main Results:

  • Aging elevates aortic interleukin-6 (IL-6) and impairs mitochondrial function, linked to increased mitophagy and Parkin.
  • Atherogenesis is accelerated in aged mice with induced hyperlipidemia.
  • Enhanced mitophagy via spermidine treatment reduced IL-6, Parkin levels, mitochondrial dysfunction, and atherosclerosis in aged mice.

Conclusions:

  • Vascular aging, characterized by elevated IL-6 and mitochondrial dysfunction, predisposes the vasculature to enhanced atherogenesis when hyperlipidemia occurs.
  • Targeting vascular mitochondrial health and inflammation prior to hyperlipidemia may offer therapeutic strategies for age-related atherosclerosis.