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Modeling C3 glomerulopathies: C3 convertase regulation on an extracellular matrix surface
Sofiya Pisarenka1,2, Nicole C Meyer1, Xue Xiao1
1Molecular Otolaryngology and Renal Research Laboratories, Caver College of Medicine, University of Iowa, Iowa City, IA, United States.
Frontiers in Immunology
|February 27, 2023
Summary
This study introduces a new in vitro model to study C3 glomerulopathies (C3G), a rare kidney disease. The model helps understand how complement alternative pathway (AP) overactivation drives C3G, aiding research into genetic and acquired factors.
Area of Science:
- Complement system biology
- Nephrology
- Immunology
Background:
- C3 glomerulopathies (C3G) are rare, complement-mediated kidney diseases.
- C3G frequently leads to end-stage renal disease (ESRD) within a decade.
- Overactivation of the complement alternative pathway (AP) drives C3G pathogenesis.
Purpose of the Study:
- To develop and validate an in vitro model for studying AP activation on a glycomatrix surface.
- To investigate the impact of genetic and acquired drivers of C3G using this novel model.
- To elucidate mechanisms of C3G pathogenesis, particularly C3 nephritic factor (C3Nef) involvement.
Main Methods:
- Developed an in vitro model using an extracellular matrix substitute (MaxGel) to reconstitute AP C3 convertase.
- Validated the model with properdin and Factor H (FH).
- Assessed the effects of genetic (mutants) and acquired (C3Nefs) drivers on C3 convertase activity and stability.
Main Results:
- C3 convertase formation on MaxGel was confirmed, regulated by properdin and FH.
- Factor B (FB) and FH mutants demonstrated impaired complement regulation.
- C3Nefs were shown to stabilize C3 convertase, revealing a novel pathogenic mechanism.
Conclusions:
- The developed ECM-based model provides a reproducible platform for evaluating complement system activity in C3G.
- This model enhances understanding of the diverse factors contributing to C3G.
- The findings offer insights into C3Nef-mediated C3G pathogenesis.
