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Age-related changes in glomerular volume and hydroxyproline content in rat and human
Journal of the American Society of Nephrology : JASN
|June 1, 1992
Summary
Glomerular size increases with age in rats and humans, but basement membrane material accumulation per volume remains constant, indicating size itself doesn't drive deposition. Aging doesn't create distinct glomerular populations.
Area of Science:
- Nephrology
- Gerontology
- Biochemistry
Background:
- Glomerular aging involves changes in size and composition.
- Understanding basement membrane material accumulation is crucial for kidney health.
Purpose of the Study:
- To investigate the relationship between glomerular volume and basement membrane material content in aging rats and humans.
- To determine if increased glomerular size accelerates basement membrane deposition.
Main Methods:
- Microdissection of glomeruli from rat and human kidneys.
- Computer-assisted image analysis for glomerular volume.
- Gas-liquid chromatography for 4-hydroxyproline (basement membrane marker).
Main Results:
- Rat glomerular volume increased with age and was larger in the inner cortex.
- Basement membrane material increased markedly with age per glomerulus but less so per unit volume.
- Human glomerular size changed across the lifespan, with material content per volume remaining relatively stable.
Conclusions:
- Glomerular size alone does not accelerate basement membrane material deposition.
- Basement membrane accumulation with age appears to be a generalized change, not driven by size.
- In humans, basement membrane material content per volume is largely maintained throughout life.