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Related Experiment Videos

Ascorbic acid protects against endogenous oxidative DNA damage in human sperm.

C G Fraga1, P A Motchnik, M K Shigenaga

  • 1Division of Biochemistry and Molecular Biology, University of California, Berkeley 94720.

Proceedings of the National Academy of Sciences of the United States of America
|December 15, 1991
PubMed
Summary

Dietary ascorbic acid (AA) protects human sperm DNA from oxidative damage. Low AA levels correlate with increased DNA damage, highlighting AA's role in preventing genetic defects and maintaining sperm quality.

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Area of Science:

  • Reproductive biology
  • Nutritional science
  • Genetics

Background:

  • Germ cell DNA damage can cause mutations, leading to birth defects, genetic diseases, and cancer.
  • Oxidative DNA damage is a significant concern, and dietary ascorbic acid (AA) plays a crucial role in its prevention.
  • Understanding the relationship between oxidative DNA damage and AA in human sperm is vital for reproductive health.

Purpose of the Study:

  • To investigate the correlation between seminal fluid ascorbic acid (AA) levels and oxidative DNA damage in human sperm.
  • To determine the impact of dietary AA intake on the levels of 8-hydroxy-2'-deoxyguanosine (oxo8dG), a marker of oxidative DNA damage, in sperm DNA.

Main Methods:

  • Measurement of 8-hydroxy-2'-deoxyguanosine (oxo8dG) in human sperm DNA from healthy subjects.

Related Experiment Videos

  • Comparison of oxo8dG levels with seminal fluid AA concentrations in two groups of individuals.
  • Controlled dietary manipulation of AA intake (ranging from 5 to 250 mg/day) to assess its effect on sperm DNA damage.

    • Main Results:

    • A significant inverse correlation was observed between seminal plasma AA levels and oxo8dG in sperm DNA among free-living individuals.
    • In a controlled study, decreasing dietary AA led to a 91% increase in sperm DNA oxo8dG.
    • Increasing dietary AA repletion for 28 days significantly reduced oxo8dG levels in sperm DNA by 36%.

    Conclusions:

    • Dietary ascorbic acid (AA) effectively protects human sperm DNA from endogenous oxidative damage.
    • Maintaining adequate AA levels is crucial for preserving sperm quality and reducing the risk of genetic defects.
    • Populations with low AA intake, such as smokers, may be particularly vulnerable to increased oxidative DNA damage in sperm.