Not So Benign: Revisiting Pure Membranous Lupus Nephritis
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Updated: Jan 7, 2026
Analyses of Proteinuria, Renal Infiltration of Leukocytes, and Renal Deposition of Proteins in Lupus-prone MRL/lpr Mice
Published on: June 8, 2022
Martina Uzzo1,2, Marta Calatroni1,2, Gabriella Luisa Moroni1,2
1Nephrology and Dialysis Division, IRCCS Humanitas Research Hospital, Via Manzoni 56, Rozzano, 20089 Milan, Italy.
Abstract:
Pure membranous lupus nephritis (pMLN, ISN/RPS-class V) is a rare form of lupus nephritis (LN). Despite being associated with significant comorbidities, it has traditionally been considered a less aggressive subtype. Emerging data challenges this perception, highlighting its potential for chronic kidney disease progression and kidney failure. pMLN is pathologically defined by subepithelial immune-complex deposits and typically presents with nephrotic syndrome, preserved renal function, and fewer systemic/immunologic manifestations compared to proliferative LN (ISN/RPS-classes III/IV). Repeat biopsies reveal frequent histological class switching from pMLN to proliferative and mixed LN forms, underscoring the dynamic nature of the disease and the limitations of clinical markers in reflecting histological activity. While the ISN/RPS kidney biopsy classification provides important prognostic insight, it does not fully capture underlying molecular heterogeneity. Recent advances in precision medicine, including proteomic and biomarker studies (e.g., EXT1/2, NCAM1), offer promising tools for patient stratification and tailored treatments. International guidelines now recommend immunosuppressive therapy for pMLN, aligning treatment strategies more closely with those for proliferative and mixed LN. Overall, pMLN should be considered a distinct but clinically relevant LN subtype requiring personalized management based on clinical, histological and molecular features. Long-term monitoring is essential, as baseline presentation does not reliably predict treatment response or disease trajectory.
Insights
Pure membranous lupus nephritis (pMLN) is a rare kidney disease subtype. Emerging research shows pMLN can progress to kidney failure, necessitating personalized treatment and long-term monitoring.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Pure membranous lupus nephritis (pMLN, ISN/RPS-class V) is a rare lupus nephritis subtype.
- Traditionally viewed as less aggressive, pMLN is now recognized for its potential to cause chronic kidney disease and failure.
- pMLN is characterized by subepithelial immune deposits, nephrotic syndrome, and often milder systemic symptoms compared to proliferative lupus nephritis.
Purpose of the Study:
- To re-evaluate the clinical significance and management of pure membranous lupus nephritis.
- To highlight the dynamic nature of lupus nephritis and limitations of current classification systems.
- To emphasize the role of emerging precision medicine approaches in managing pMLN.
Main Methods:
- Review of existing literature and clinical data on pure membranous lupus nephritis.
- Analysis of pathological findings, including histological class switching.
- Examination of recent advances in proteomic and biomarker research for lupus nephritis.
Main Results:
- Pure membranous lupus nephritis can progress to kidney failure, challenging its historical classification as less aggressive.
- Histological class switching from pMLN to proliferative forms is common, indicating disease dynamism.
- Biomarkers like EXT1/2 and NCAM1 show promise for patient stratification.
Conclusions:
- Pure membranous lupus nephritis is a distinct subtype requiring personalized management strategies.
- Current international guidelines recommend immunosuppressive therapy for pMLN, similar to other lupus nephritis classes.
- Long-term monitoring is crucial as initial presentation does not predict treatment response or disease course.
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