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Mesangial hypercellularity predicts antiproteinuric response to dual blockade of RAS in primary glomerulonephritis

R Minutolo1, M M Balletta, F Catapano

  • 1Nephrology Division, Second University of Naples - SMdP Incurabili Hospital-ASL Na1, Naples, Italy.

Kidney International
|August 3, 2006
PubMed

Insights

The combination of converting enzyme inhibitor and angiotensin II receptor blocker (CEI+ARB) effectively reduces proteinuria in primary glomerulonephritis. Mesangial cellularity is the key predictor of treatment response, indicating its role in disease progression.

Area of Science:

  • Nephrology
  • Pathology
  • Pharmacology

Background:

  • Converting enzyme inhibitor and angiotensin II receptor blocker (CEI+ARB) combination therapy's antiproteinuric effect varies.
  • Predicting response to CEI+ARB in primary glomerulonephritis (GN) is crucial for personalized treatment.

Purpose of the Study:

  • To identify clinicopathologic predictors of response to CEI+ARB therapy in patients with primary GN and persistent proteinuria.
  • To evaluate the relationship between histological features and antiproteinuric efficacy of CEI+ARB.

Main Methods:

  • Analysis of 43 treatment-naïve primary GN patients with persistent proteinuria despite CEI monotherapy.
  • Histological assessment of 557 glomeruli and 165 arteries for mesangial cellularity, glomerulosclerosis, tubulointerstitial damage, and vascular lesions.
  • Comparison of proteinuria reduction between proliferative and non-proliferative GN, and between responders and non-responders to CEI+ARB.

Main Results:

  • Proteinuria significantly decreased from 3.5 g/day to 1.5 g/day after CEI+ARB therapy (P<0.0001).
  • Antiproteinuric response was greater in proliferative GN (-63.3%) compared to non-proliferative GN (-42.4%) (P=0.006).
  • Responders to CEI+ARB showed a higher prevalence of proliferative GN (71.4%) and significantly greater mesangial cellularity scores (1.76 vs. 1.20, P<0.0001).

Conclusions:

  • Mesangial cellularity is the strongest independent predictor of antiproteinuric response to CEI+ARB in primary GN.
  • Higher mesangial cellularity suggests increased angiotensin II activity, contributing to proliferation and treatment efficacy.
  • Histological assessment, particularly mesangial cellularity, can guide treatment decisions for CEI+ARB therapy in GN.

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