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Related Experiment Videos

Increased chromosomal instability in lymphocytes from elderly humans.

R T Dutkowski, R Lesh, L Staiano-Coico

    Mutation Research
    |May 1, 1985
    PubMed
    Summary

    Chromosomes in older adults' lymphocytes show more damage from radioactive thymidine and BrdU. This indicates increased chromosomal instability with aging, impacting DNA repair and cell health.

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    Area of Science:

    • Cell Biology
    • Genetics
    • Aging Research

    Background:

    • Cellular aging is associated with genomic instability.
    • Understanding age-related changes in lymphocyte DNA is crucial for aging research.

    Purpose of the Study:

    • To investigate age-related differences in chromosomal damage in human lymphocytes.
    • To assess the impact of radiolabeled thymidine and BrdU on lymphocyte chromosomes from young and old donors.

    Main Methods:

    • Lymphocytes from young and old donors were cultured with PHA.
    • Cells were exposed to [3H]Tdr or BrdU.
    • Chromosomal damage and sister-chromatid exchanges were analyzed via autoradiography and microscopy.

    Main Results:

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  • Comparable [3H]Tdr incorporation was observed in both age groups.
  • Lymphocytes from older donors exhibited significantly greater chromosomal damage (breaks, fragments, exchanges, dicentrics) after [3H]Tdr exposure.
  • Older donors' lymphocytes showed increased sister-chromatid exchanges upon BrdU exposure.

    • Conclusions:

    • Chromosomes in lymphocytes from older individuals are more susceptible to damage induced by [3H]Tdr and BrdU.
    • Aging is associated with increased chromosomal instability and reduced DNA repair capacity in lymphocytes.