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Age-associated changes in gene expression patterns in the liver.

Robert P Thomas1, Michelle Guigneaux, Thomas Wood

  • 1Department of Surgery, The University of Texas Medical Branch, Galveston, TX 77555-0536, USA.

Journal of Gastrointestinal Surgery : Official Journal of the Society for Surgery of the Alimentary Tract
|May 23, 2002
PubMed
Summary

Aging alters liver gene expression, increasing antioxidant and detoxifying genes in both rats and humans. This suggests a complex relationship between liver function, detoxification, and the aging process.

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Area of Science:

  • Gerontology
  • Molecular Biology
  • Hepatology

Background:

  • Aging is a complex biological process with poorly understood mechanisms.
  • Oxidation-reduction (redox) enzyme activity changes with age, but systematic gene expression analysis is lacking.
  • The liver's role in homeostasis and detoxification makes hepatic gene expression changes with aging critical for understanding health outcomes.

Purpose of the Study:

  • To systematically analyze age-related changes in gene expression patterns in rat and human livers.
  • To identify specific genes and pathways affected by aging in hepatic tissue.
  • To compare age-associated gene expression patterns between species.

Main Methods:

  • Gene array analysis (Affymetrix GeneChip) was used to compare gene expression in young and aged rat and human livers.

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  • Total RNA was extracted from liver tissues of different age groups.
  • Selected gene expression changes were validated using reverse transcription-polymerase chain reaction (RT-PCR).

    • Main Results:

    • Significant changes in gene expression were observed in aged livers: 582 genes in rats and 192 genes in humans (a threefold or greater change).
    • Common patterns of increased gene expression with aging were found in both species, particularly for antioxidant and cytochrome P-450 family genes.
    • Aged rat and human livers showed increased expression of key antioxidant and detoxification-related genes.

    Conclusions:

    • Aging significantly alters hepatic gene expression patterns in both rats and humans.
    • The observed induction of antioxidant and detoxifying genes suggests a complex interplay between liver function, detoxification capacity, and senescence.
    • These findings highlight the liver's adaptive response to aging at the molecular level.