How Glomerulonephritis Leads to Kidney Failure: Mechanisms Explained

Pathways to Renal Failure

1. Direct Glomerular Injury – Inflammation impairs filtration barrier → proteinuria, hematuria, reduced GFR.
2. Scarring (Glomerulosclerosis) – Chronic inflammation → collagen deposition → obliteration of capillary tufts → irreversible nephron loss.
3. Reduced Perfusion – Afferent arteriolar narrowing → ischemia → tubular atrophy, interstitial fibrosis.
4. Tubulointerstitial Damage – Protein overload toxicity, inflammatory spillover → tubular injury, fibrosis.
5. Maladaptive Pathway Activation – RAAS overactivity, complement, endothelin → fibrosis, hypertension, further glomerular stress.
6. Systemic Effects – Uncontrolled hypertension accelerates vascular injury; uremic toxins compound damage.

Clinical Implication

Early immunosuppression (for immune-mediated GN) and strict BP/proteinuria control (ACEi/ARB, SGLT2i) slow progression. Biopsy guides therapy.