Minimal change disease and idiopathic FSGS: manifestations of the same disease

Area of Science:

• Nephrology
• Pathology
• Immunology

Background:

• Idiopathic nephrotic syndrome (INS) presents with minimal change disease (MCD) or focal segmental glomerulosclerosis (FSGS).
• MCD and FSGS are typically viewed as distinct entities due to differing clinical and histological features.
• Limited evidence supports the separation of MCD and idiopathic FSGS.

Purpose of the Study:

• To propose that MCD and idiopathic FSGS are manifestations of a single progressive kidney disease.
• To advocate for joint investigation into the pathogenesis of MCD and idiopathic FSGS.
• To reframe idiopathic FSGS as an advanced stage of the disease process.

Main Methods:

• Review of existing literature on MCD, FSGS, and podocyte injury.
• Analysis of clinical characteristics, histological findings, and outcomes in INS patients.
• Consideration of animal models of podocyte loss and human glomerulopathies.

Main Results:

• FSGS development is documented in patients with non-remitting or relapsing INS.
• Substantial podocyte loss uniformly leads to FSGS in animal models.
• FSGS is a common feature in progressive human glomerulopathies, suggesting a shared pathway.

Conclusions:

• MCD and idiopathic FSGS likely represent different stages of the same underlying disease process.
• Investigating MCD and FSGS together is crucial for understanding INS pathogenesis.
• Idiopathic FSGS may be a less treatable, advanced stage compared to MCD.