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Estimation of Nephron Number in Whole Kidney using the Acid Maceration Method
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The aging kidney: physiological changes.

Jessica R Weinstein1, Sharon Anderson

  • 1Oregon Health and Science University, Portland, 97239, USA.

Advances in Chronic Kidney Disease
|July 9, 2010
PubMed
Summary
This summary is machine-generated.

Kidney function declines with age due to reduced blood flow and structural damage. These changes increase the risk of acute kidney injury and chronic kidney disease in older adults.

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Area of Science:

  • Nephrology
  • Gerontology
  • Physiology

Background:

  • Age-associated decline in kidney function is a well-documented phenomenon.
  • This decline involves progressive decreases in glomerular filtration rate (GFR) and renal blood flow, with significant individual variability.
  • Key factors include reduced glomerular capillary plasma flow rate and ultrafiltration coefficient, alongside hemodynamic and structural alterations.

Purpose of the Study:

  • To elucidate the multifaceted changes in kidney structure and function associated with aging.
  • To explore the impact of these age-related changes on vasoactive stimuli response and predisposition to kidney injury.
  • To highlight the role of specific systems like renin-angiotensin and nitric oxide, and the influence of gender.

Main Methods:

  • The study reviews established knowledge on age-related kidney function decline.
  • It analyzes hemodynamic alterations, including afferent arteriolar resistance and glomerular capillary hydraulic pressure.
  • Structural changes such as renal mass loss, arteriolar hyalinization, glomerular sclerosis, and tubulointerstitial fibrosis are examined.

Main Results:

  • Aging leads to reduced GFR and renal blood flow, stemming from decreased plasma flow rate and ultrafiltration coefficient.
  • Hemodynamic changes are accompanied by structural damage, including glomerulosclerosis and tubulointerstitial fibrosis.
  • Altered responsiveness to vasoactive stimuli, with enhanced vasoconstriction and impaired vasodilation, is a hallmark of aging kidneys.

Conclusions:

  • Age-related kidney changes, including hemodynamic and structural alterations, impair kidney function and increase susceptibility to injury.
  • Dysregulation of renin-angiotensin and nitric oxide systems, influenced by gender, plays a crucial role in age-related kidney disease.
  • These cumulative changes predispose the aging kidney to acute kidney injury and progressive chronic kidney disease.