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Estimation of Nephron Number in Whole Kidney using the Acid Maceration Method
Published on: May 22, 2019
Senile nephrosclerosis--does it explain the decline in glomerular filtration rate with aging?
Andrew D Rule1, Lynn D Cornell, Emilio D Poggio
1Division of Nephrology and Hypertension and Division of Epidemiology, Rochester, MN 55905, USA. rule.andrew @ mayo.edu
Nephron. Physiology
|August 12, 2011
Summary
Nephrosclerosis, a kidney condition, does not solely explain age-related declines in glomerular filtration rate (GFR) in healthy adults. Aging itself appears to be a significant factor in reduced GFR, independent of this specific kidney pathology.
Area of Science:
- Nephrology
- Gerontology
- Renal Pathology
Background:
- Nephrosclerosis, characterized by glomerulosclerosis, tubular atrophy, interstitial fibrosis, and arteriosclerosis, is histologically linked to chronic kidney disease.
- Clinical identification of chronic kidney disease relies on reduced glomerular filtration rate (GFR).
- Many older adults are diagnosed with chronic kidney disease due to age-related GFR decline, even when otherwise healthy.
Purpose of the Study:
- To investigate the association between nephrosclerosis and glomerular filtration rate (GFR) in healthy adults, independent of age.
- To evaluate whether age-related GFR decline can be fully attributed to nephrosclerosis in older individuals.
Main Methods:
- Analysis of renal biopsies from healthy adult living kidney donors.
- Correlation of histological findings of nephrosclerosis with measured GFR, adjusting for age.
Main Results:
- Nephrosclerosis on renal biopsy did not associate with GFR independent of age in healthy adults.
- The age-related decline in GFR appears to be a complex process, not solely explained by nephrosclerosis.
Conclusions:
- The findings suggest that aging (senescence) is a primary driver of both GFR decline and nephrosclerosis.
- Other structural kidney changes or extrarenal factors may contribute to age-related GFR reduction.
- Existing data do not support the hypothesis that nephrosclerosis fully explains age-related GFR decline in a subset of older adults.
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