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Related Experiment Videos

Gene expression in aging kidney and pituitary.

Laurence Preisser1, Laetitia Houot, Laurent Teillet

  • 1Service de Biologie Cellulaire, CEA/Saclay, 91191 Gif-sur-Yvette, France.

Biogerontology
|May 13, 2004
PubMed
Summary

Aging rat kidneys show minimal gene expression changes, unlike the pituitary gland, suggesting post-transcriptional regulation of kidney protein levels. This research focuses on aging and gene expression in key organs.

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Area of Science:

  • Molecular Biology
  • Gerontology
  • Physiology

Background:

  • Aging is associated with physiological changes in organs like the kidney and pituitary.
  • Understanding age-related gene expression is crucial for identifying mechanisms of decline and disease.
  • Previous studies suggest protein downregulation in aging kidneys, but the underlying transcriptional changes are unclear.

Purpose of the Study:

  • To investigate age-related changes in gene expression in the kidney and pituitary of WAG/Rij rats.
  • To determine if observed protein changes in aging kidneys are due to altered mRNA levels.
  • To compare gene expression profiles between aging kidneys and pituitaries.

Main Methods:

  • Subtractive hybridization was used to identify differentially expressed genes.

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  • DNA microarrays (4050 rodent genes) were employed to assess global gene expression in the kidney.
  • Reverse transcription polymerase chain reaction (RT-PCR) was used to validate specific gene expression levels.

    • Main Results:

    • Only one of 350 cDNA fragments showed a >2-fold change in kidney expression between young and old rats.
    • Microarray analysis revealed no significant kidney gene downregulation (<0.5) or upregulation (>2.0).
    • Pituitary gene expression showed significant changes, with 11 genes upregulated and 6 downregulated (>2.0 or <0.5, respectively).

    Conclusions:

    • Kidney mRNA expression remains largely stable in aging rats free from nephrosis, within the 0.5-2.0 fold change range.
    • Age-related protein downregulation in healthy aging kidneys is likely due to post-transcriptional modifications.
    • The pituitary gland exhibits more pronounced age-related alterations in gene expression compared to the kidney.