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Telomere shortening in kidneys with age
Anette Melk1,2, Vido Ramassar1, Lisa M H Helms1
1Division of Nephrology and Immunology, University of Alberta, Edmonton, Alberta, Canada.
Journal of the American Society of Nephrology : JASN
|March 7, 2000
Summary
Kidney telomeres shorten with age, especially in the renal cortex. This age-dependent telomere loss may contribute to kidney aging and disease mechanisms.
Area of Science:
- Nephrology
- Gerontology
- Molecular Biology
Background:
- Kidney function declines with age and disease, but renal aging mechanisms remain unclear.
- In vitro studies link telomere shortening to cellular senescence and aging.
- Telomeres are protective caps on chromosomes that shorten with cell division.
Purpose of the Study:
- To investigate the relationship between chronological age and telomere length in human kidney tissue.
- To determine if telomere shortening occurs in the kidney with aging and if it differs between renal cortex and medulla.
Main Methods:
- Analysis of telomere length in 24 human kidney surgical samples (17 normal, 7 abnormal) using Southern blotting of terminal restriction fragments (TRF) and slot blotting.
- Quantification of telomere DNA loss over time using regression analysis.
- Comparison of telomere length between renal cortex and medulla.
Main Results:
- Telomere length significantly decreased with age in the renal cortex, at rates of 0.24% per year (TRF) and 0.25% per year (slot blot).
- Telomere loss in the renal medulla was not statistically significant and was less pronounced than in the cortex.
- Telomere length was greater in the cortex than the medulla, with this difference diminishing with age due to cortical telomere shortening.
Conclusions:
- Telomeres shorten in an age-dependent manner in the human kidney, particularly in the renal cortex.
- This age-related telomere attrition may play a role in kidney aging and the pathogenesis of age-related kidney diseases.