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Molecular events in kidney ageing
Konrad S Famulski1, Phillip F Halloran
1Department of Medicine, Division of Nephrology and Transplantation Immunology, University of Alberta, Edmonton, Alberta, Canada.
Current Opinion in Nephrology and Hypertension
|April 12, 2005
Summary
Kidney ageing involves cellular senescence, accelerated by stress and telomere shortening. Understanding these mechanisms is crucial for kidney disease and transplantation, with p16 as a key age marker.
Area of Science:
- Nephrology
- Cellular Biology
- Gerontology
Background:
- Kidney ageing and dysfunction pose significant clinical challenges, impacting renal health and transplant outcomes.
- Donor age and cellular stresses (nephropathies, inflammation, rejection) accelerate kidney senescence and atrophy.
- Limited epithelial cell repair and telomere shortening contribute to age-related nephron loss.
Purpose of the Study:
- To elucidate the mechanisms of cellular senescence in kidney ageing and disease.
- To understand the implications of cellular senescence for kidney transplantation.
- To explore the role of intrinsic and extrinsic factors in renal cellular senescence.
Main Methods:
- Review of recent findings on cellular senescence pathways.
- Analysis of the contribution of replicative and environmental stress-induced senescence.
- Investigation of epigenetic factors influencing ageing and senescence.
Main Results:
- Replicative and environmental stresses additively induce cellular senescence via ATM/p53/p21 and Ras/p38/p16 pathways.
- Epigenetic factors like protein acylation, chromatin remodeling, and caloric restriction are key in ageing and senescence.
- p16 is a reliable marker for kidney chronological age and stress-induced premature senescence.
Conclusions:
- Cellular senescence is better understood in vitro than in vivo, with p16 as a key renal age marker.
- Caloric restriction shows potential benefits for organ ageing.
- Further research on histone acetylation in pathological states is warranted.