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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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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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Analysis of Oxidative Stress in Zebrafish Embryos
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Oxidative stress and ageing.

M A Birch-Machin1, A Bowman2

  • 1Dermatological Sciences, Institute of Cellular Medicine, Newcastle University (medical school), Newcastle upon Tyne, NE24HH, U.K. mark.birch-machin@ncl.ac.uk.

The British Journal of Dermatology
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Summary
This summary is machine-generated.

Skin aging is linked to oxidative stress and mitochondrial dysfunction. Complex II activity declines with age in skin fibroblasts, suggesting it as a potential biomarker for monitoring skin aging progression.

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Area of Science:

  • Biochemistry
  • Dermatology
  • Aging Research

Background:

  • Oxidative stress, caused by redox imbalances, is a key factor in skin aging.
  • Mitochondrial dysfunction and altered bioenergetics in skin cells contribute to the aging process.
  • Complex II of the mitochondrial electron transport chain is implicated in free radical generation.

Approach:

  • Investigated the relationship between Complex II activity and aging in human skin fibroblasts and keratinocytes.
  • Measured Complex II activity per unit of mitochondria across a wide age range.
  • Analyzed transcript and protein levels of Complex II subunits (SDHA, SDHB) and Complex IV activity.

Key Points:

  • Complex II activity significantly decreased with age in fibroblasts, but not keratinocytes.
  • This decline correlated with reduced SDHA and SDHB transcript and protein levels.
  • A significant decrease in Complex II activity was specific to senescent skin cells.

Conclusions:

  • Complex II activity serves as a potential biomarker for monitoring skin aging.
  • The findings highlight the specific role of Complex II in age-related changes in skin fibroblasts.
  • This research offers insights into the mitochondrial theory of aging and its manifestation in skin.