Relationship between vascular disease and age-associated changes in the human kidney

Area of Science:

• Nephrology
• Cardiovascular Pathology
• Gerontology

Background:

• Atherosclerotic vascular disease is a major health concern, often associated with age-related organ changes.
• The human kidney undergoes age-associated alterations, but the specific impact of atherosclerosis requires further investigation.

Purpose of the Study:

• To examine the relationship between atherosclerotic vascular disease and age-related changes in the normal human kidney.
• To compare renal histology and autopsy findings in individuals with mild versus moderate-to-severe atherosclerosis.

Main Methods:

• Autopsy findings and renal histology from 114 individuals (57 mild atherosclerosis, 57 moderate-to-severe atherosclerosis) were analyzed.
• Morphometric techniques measured glomerular area, intrarenal arteries, and interstitial fibrosis.
• Multiple linear regression assessed the impact of various factors on glomerulosclerosis and glomerular size.

Main Results:

• Individuals with moderate-to-severe atherosclerosis showed a higher incidence of glomerulosclerosis (15.4% vs 8.3%) and increased intrarenal arterial wall area (60% vs 55%).
• Nonsclerotic glomeruli were larger in the moderate-to-severe atherosclerosis group, suggesting compensatory hypertrophy.
• Age and intrarenal vascular disease were independently associated with glomerulosclerosis; glomerular size correlated with heart weight and coronary atherosclerosis.

Conclusions:

• Atherosclerotic vascular disease is linked to accelerated kidney aging, specifically increased glomerulosclerosis and intrarenal arterial disease.
• Both chronological age and the severity of intrarenal vascular disease are significant independent predictors of glomerulosclerosis.
• Compensatory glomerular hypertrophy may occur in response to atherosclerotic damage.