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Human ovarian aging is characterized by oxidative damage and mitochondrial dysfunction.

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Ovarian aging and declining fertility in women are linked to oxidative stress and mitochondrial dysfunction in oocytes. This damage occurs even in early stages, causing oocytes to use alternative energy sources.

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NAD+mitochondrial dysfunctionoocyte qualityovarian ageingoxidative damage

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Area of Science:

  • Reproductive biology and aging research.
  • Cellular metabolism and oxidative stress studies.

Background:

  • Female fertility declines with age, a phenomenon linked to oocyte quality.
  • Oxidative stress and mitochondrial dysfunction are suspected contributors but data on early oocyte stages are limited.

Purpose of the Study:

  • To investigate if oxidative stress and mitochondrial dysfunction in oocytes cause age-related fertility decline.
  • To examine oxidative damage and metabolic changes in oocytes from women of advanced maternal age.

Main Methods:

  • Analysis of ovarian tissue biopsies and immature oocytes from different age groups using immunofluorescence, metabolomics, and lipidomics.
  • Assessment of oxidative damage, oxidative phosphorylation, and metabolic profiles.

Main Results:

  • Oxidative damage and lipid peroxidation were observed in primordial follicles of older women.
  • Oocytes from older women showed altered glutathione ratios, depleted phospholipids, and decreased mitochondrial function.
  • Evidence suggests oocytes from advanced maternal age utilize alternative energy pathways like glycolysis.

Conclusions:

  • Oxidative stress and mitochondrial dysfunction are present in oocytes from women of advanced maternal age, contributing to fertility decline.
  • Targeted interventions to improve mitochondrial function and reduce oxidative damage may be beneficial for fertility preservation.