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Recent Progress in Deciphering the Etiopathogenesis of Primary Membranous Nephropathy
Andreas Kronbichler1, Jun Oh2, Björn Meijers3,4
1Department of Internal Medicine IV (Nephrology and Hypertension), Medical University Innsbruck, Anichstraße 35, 6020 Innsbruck, Austria.
Abstract:
Primary membranous nephropathy (MN) is the leading cause of nephrotic syndrome in adults. Discovery of several antibodies has contributed to an increased understanding of MN. Antibodies against the M-type phospholipase A2 receptor (PLA2R) are present in 50-100% with primary MN and are associated with a lower frequency of spontaneous remission. High levels are linked with a higher probability of treatment resistance, higher proteinuria, and impaired renal function, as well as a more rapid decline of kidney function during follow-up. Immunologic remission precedes reduction of proteinuria by months. Pretransplant evaluation of PLA2R antibodies is warranted to predict recurrence of disease following renal transplantation. Several risk alleles related to the PLA2R1 gene and within the HLA loci have been identified, whereas epitope spreading of PLA2R may predict treatment response. More recently, thrombospondin type 1 domain-containing 7A (THSD7A) antibodies have been discovered in primary MN. Several other rare antigens have been described, including antibodies against neutral endopeptidase as a cause of antenatal MN and circulating cationic bovine serum albumin as an antigen with implications in childhood MN. This review focuses on the progress with a special focus on diagnostic accuracy, predictive value, and treatment implications of the established and proposed antigens.
Insights
Primary membranous nephropathy (MN) is a leading cause of nephrotic syndrome. Identifying antibodies like PLA2R and THSD7A aids diagnosis, predicts prognosis, and guides treatment for better patient outcomes.
Area of Science:
- Nephrology
- Immunology
- Genetics
Background:
- Primary membranous nephropathy (MN) is the main cause of nephrotic syndrome in adults.
- Advances in identifying specific antibodies have significantly improved understanding of MN.
- Antibodies against M-type phospholipase A2 receptor (PLA2R) are key biomarkers.
Purpose of the Study:
- To review diagnostic accuracy, predictive value, and treatment implications of established and proposed antigens in primary MN.
- To highlight the role of PLA2R antibodies in disease progression and recurrence.
- To discuss newly discovered antigens and their relevance.
Main Methods:
- Review of literature on antibodies in primary MN.
- Analysis of diagnostic and prognostic significance of autoantibodies.
- Evaluation of genetic associations and epitope spreading.
Main Results:
- PLA2R antibodies are found in 50-100% of primary MN cases, linked to lower remission rates and poorer outcomes.
- High PLA2R antibody levels correlate with treatment resistance and faster kidney function decline.
- THSD7A antibodies and other rare antigens (e.g., NEPN, cBSA) are identified in specific MN subtypes.
Conclusions:
- Antibody identification is crucial for diagnosing and managing primary MN.
- PLA2R antibody levels and epitope spreading can predict treatment response and disease recurrence.
- Further research into novel antigens will refine diagnostic and therapeutic strategies for MN.
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