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Molecular and Cellular Mechanisms for Proteinuria in Minimal Change Disease
Roberta Bertelli1, Alice Bonanni1, Gianluca Caridi1
1Laboratory of Molecular Nephrology, Genoa, Italy.
Abstract:
Minimal Change Disease (MCD) is a clinical condition characterized by acute nephrotic syndrome, no evident renal lesions at histology and good response to steroids. However, frequent recurrence of the disease requires additional therapies associated with steroids. Such multi-drug dependence and frequent relapses may cause disease evolution to focal and segmental glomerulosclerosis (FSGS) over time. The differences between the two conditions are not well defined, since molecular mechanisms may be shared by the two diseases. In some cases, genetic analysis can make it possible to distinguish MCD from FSGS; however, there are cases of overlap. Several hypotheses on mechanisms underlying MCD and potential molecular triggers have been proposed. Most studies were conducted on animal models of proteinuria that partially mimic MCD and may be useful to study glomerulosclerosis evolution; however, they do not demonstrate a clear-cut separation between MCD and FSGS. Puromycin Aminonucleoside and Adriamycin nephrosis are models of glomerular oxidative damage, characterized by loss of glomerular basement membrane polyanions resembling MCD at the onset and, at more advanced stages, by glomerulosclerosis resembling FSGS. Also Buffalo/Mna rats present initial lesions of MCD, subsequently evolving to FSGS; this mechanism of renal damage is clearer since this rat strain inherits the unique characteristic of overexpressing Th2 cytokines. In Lipopolysaccharide nephropathy, an immunological condition of renal toxicity linked to B7-1(CD80), mice develop transient proteinuria that lasts a few days. Overall, animal models are useful and necessary considering that they reproduce the evolution from MCD to FSGS that is, in part, due to persistence of proteinuria. The role of T/Treg/Bcells on human MCD has been discussed. Many cytokines, immunomodulatory mechanisms, and several molecules have been defined as a specific cause of proteinuria. However, the hypothesis of a single cell subset or molecule as cause of MCD is not supported by research and an interactive process seems more logical. The implication or interactive role of oxidants, Th2 cytokines, Th17, Tregs, B7-1(CD80), CD40/CD40L, c-Mip, TNF, uPA/suPAR, Angiopoietin-like 4 still awaits a definitive confirmation. Whole genome sequencing studies could help to define specific genetic features that justify a definition of MCD as a "clinical-pathology-genetic entity."
Insights
Minimal Change Disease (MCD) can evolve into focal and segmental glomerulosclerosis (FSGS), often requiring multiple therapies. Research explores shared molecular mechanisms and genetic factors to differentiate these conditions and understand disease progression.
Area of Science:
- Nephrology
- Immunology
- Genetics
Background:
- Minimal Change Disease (MCD) presents as acute nephrotic syndrome with minimal histological renal changes and good steroid response.
- Frequent MCD relapses and steroid dependence can lead to disease progression to focal and segmental glomerulosclerosis (FSGS).
- Distinguishing between MCD and FSGS is challenging due to overlapping molecular mechanisms and occasional genetic similarities.
Purpose of the Study:
- To explore the shared molecular mechanisms and potential triggers underlying Minimal Change Disease (MCD) and its evolution to focal and segmental glomerulosclerosis (FSGS).
- To evaluate the utility of animal models in understanding the progression from MCD to FSGS.
- To discuss the potential role of genetic analysis and various molecular pathways in defining MCD as a distinct clinical-pathological-genetic entity.
Main Methods:
- Review of existing literature on Minimal Change Disease (MCD) and focal and segmental glomerulosclerosis (FSGS).
- Analysis of findings from various animal models of proteinuria and glomerular damage (e.g., Puromycin Aminonucleoside, Adriamycin nephrosis, Buffalo/Mna rats, Lipopolysaccharide nephropathy).
- Discussion of proposed molecular mechanisms, including the role of cytokines, immune cells (T/Treg/B cells), and specific molecules (B7-1, CD40/CD40L, TNF, etc.).
Main Results:
- Animal models partially mimic the evolution from MCD to FSGS, often linked to persistent proteinuria.
- Specific rat strains (Buffalo/Mna) offer clearer insights into MCD evolution due to Th2 cytokine overexpression.
- While various molecules and cytokines are implicated, a single causative factor for MCD is unlikely; an interactive process is suggested.
Conclusions:
- Animal models are crucial for studying the progression from MCD to FSGS, particularly concerning persistent proteinuria.
- The interplay of multiple factors including oxidants, cytokines (Th2, Th17), immune cells (Tregs, B cells), and molecules (B7-1, CD40/CD40L, TNF, etc.) is likely involved in MCD pathogenesis.
- Whole genome sequencing may help establish specific genetic features to define MCD as a distinct clinical-pathology-genetic entity, aiding differentiation from FSGS.
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