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Structural-functional relationships in Alport syndrome

K H Kim1, Y Kim, M C Gubler

  • 1Department of Pediatrics, University of Minnesota, Minneapolis 55455, USA.

Journal of the American Society of Nephrology : JASN
|March 1, 1995
PubMed
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Alport syndrome patients show altered glomerular basement membrane width and increased interstitial fibrosis, partially explaining reduced kidney function. Decreased glomerular capillary wall hydraulic conductivity may be a key factor in Alport syndrome renal dysfunction.

Area of Science:

  • Nephrology
  • Pathology
  • Renal Medicine

Background:

  • Alport syndrome is a genetic disorder affecting collagen IV, crucial for kidney structure.
  • Renal dysfunction in Alport syndrome is complex and not fully understood structurally.
  • Morphometric analysis can reveal structural changes underlying kidney disease.

Purpose of the Study:

  • To investigate the structural basis of renal dysfunction in Alport syndrome.
  • To correlate renal morphometric parameters with creatinine clearance.
  • To compare structural findings in Alport syndrome with controls and diabetic patients.

Main Methods:

  • Renal morphometric analysis was conducted on kidney biopsies from Alport syndrome patients and controls.
  • Measurements included glomerular basement membrane width, mesangial volume fraction, GBM surface density, and interstitial volume fraction.

Related Experiment Videos

  • Glomerular sclerosis and glomerular number were also assessed.

    • Main Results:

    • Alport syndrome patients exhibited skewed glomerular basement membrane width distribution and increased cortical interstitial volume fraction.
    • Mesangial volume fraction and peripheral GBM surface density showed inverse correlations with creatinine clearance.
    • Cortical interstitial volume fraction and glomerular sclerosis were highly inversely correlated with creatinine clearance, but less so than in diabetic patients.

    Conclusions:

    • Structural changes like interstitial fibrosis and GBM alterations partially explain reduced kidney function in Alport syndrome.
    • The observed reductions in creatinine clearance are disproportionately greater in Alport syndrome compared to diabetes with similar structural changes.
    • Decreased glomerular capillary wall hydraulic conductivity is hypothesized as a potential explanation for the observed discrepancies.