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Nephrosclerosis-Related Histopathological Findings by Cortical Region From a Japanese Community-Based Study.

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Nephrosclerosis lesions worsen with declining kidney function, showing distinct patterns in different kidney cortex regions. Arterial and tubulointerstitial damage appear more closely linked to kidney dysfunction than glomerular damage.

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Area of Science:

  • Nephrology
  • Renal Pathology
  • Histopathology

Background:

  • Nephrosclerosis is a leading cause of end-stage kidney disease.
  • Kidney biopsy is rarely performed for nephrosclerosis diagnosis, limiting studies on kidney function and histopathology.
  • Understanding these associations is crucial for managing chronic kidney disease.

Purpose of the Study:

  • To investigate the relationship between kidney function and histopathologic findings of nephrosclerosis.
  • To analyze the distribution of nephrosclerosis lesions across different depths of the kidney cortex.
  • To determine the association between estimated glomerular filtration rate (eGFR) and specific lesion types.

Main Methods:

  • A cross-sectional study utilizing autopsy kidney specimens from 181 individuals.
  • Histopathologic evaluation of glomerular, tubulointerstitial, and vascular lesions in superficial, middle, and juxtamedullary cortical regions.
  • Generalized linear mixed-effects models were used to test associations between eGFR and histopathologic findings.

Main Results:

  • Histopathologic lesions significantly progressed with declining kidney function across all cortical regions.
  • Distinct lesion patterns were observed: glomerulosclerosis and interstitial fibrosis in the superficial cortex; arterial thickening and arteriolar hyalinosis in the juxtamedullary cortex.
  • Cortical region specificity of lesions diminished as kidney function worsened.

Conclusions:

  • Nephrosclerotic lesions exhibit a cortex region-dependent gradient.
  • Arterial and tubulointerstitial lesions may correlate more strongly with renal dysfunction than glomerular lesions.
  • Findings highlight the complex interplay between kidney structure and function in nephrosclerosis.