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Membranous Nephropathy: Antigenic Landscape and a Novel Pathogenetic Model
Irina Zdravkova1,2, Eduard Tilkiyan2,3, Desislava Bozhkova4,5
1Department of Propaedeutics of Internal Diseases, Medical Faculty, Medical University of Plovdiv, 4000 Plovdiv, Bulgaria.
Abstract:
Membranous nephropathy is a disease that has been well documented, yet its etiopathogenesis has not been fully clarified and the distinction between its primary and secondary forms has not been completely categorized. The discovery of new antigens and antibodies reveals different percentages of positivity in secondary membranous nephropathy, which is a cause of great confusion and ambiguity not only in diagnosis but also in the choice of a therapeutic approach. The aim of this review is to summarize the literature on newly discovered antigens and antibodies, and to propose a pathogenetic model based on the role of the complement system and its activation pathways. In this model, antigens are categorized based on the type of immunoglobulin deposits and the putative complement pathways that they activate, which can help to differentiate primary from secondary membranous nephropathy. The model also reflects how the deposition of foreign antigens in the basement membrane can activate both the lectin and classical complement pathways, which may explain why positive antibodies are observed in both primary and secondary forms of membranous nephropathy.
Insights
Membranous nephropathy pathogenesis remains unclear. This review proposes a model categorizing antigens and complement activation pathways to help distinguish primary from secondary forms of this kidney disease.
Area of Science:
- Nephrology
- Immunology
- Pathogenesis
Background:
- Membranous nephropathy's etiopathogenesis is not fully understood.
- Distinguishing primary and secondary forms is challenging.
- New antigen/antibody discoveries add diagnostic ambiguity.
Purpose of the Study:
- To review newly discovered antigens and antibodies in membranous nephropathy.
- To propose a pathogenetic model.
- To differentiate primary and secondary forms.
Main Methods:
- Literature review of new antigens and antibodies.
- Development of a pathogenetic model.
- Categorization of antigens by immunoglobulin deposits and complement pathways.
Main Results:
- A model is proposed linking antigens to immunoglobulin deposits and complement pathways.
- The model helps differentiate primary and secondary membranous nephropathy.
- Activation of lectin and classical complement pathways by foreign antigens is highlighted.
Conclusions:
- The proposed model aids in clarifying membranous nephropathy pathogenesis.
- Understanding complement activation pathways is key to differentiating disease forms.
- This approach may improve diagnosis and therapeutic strategies.
