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Complement Profiling in Glomerular Disease: Insights from Laser Microdissection and Mass Spectrometry.
1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota.
Clinical Journal of the American Society of Nephrology : CJASN
|October 29, 2025
Summary
Laser microdissection and mass spectrometry (LMD/MS) offers detailed complement analysis in kidney biopsies. This advanced method aids in understanding glomerular diseases and personalizing anticomplement therapy.
Area of Science:
- Nephrology
- Immunology
- Proteomics
Background:
- Complement activation is common in glomerular diseases, indicated by C3c and C1q deposition on biopsies.
- Kidney biopsies offer limited insights, failing to identify all complement proteins or distinguish active from inactive forms.
Purpose of the Study:
- To evaluate the utility of laser microdissection and mass spectrometry (LMD/MS) for comprehensive complement profiling in glomerular diseases.
- To analyze the proteomic complement profile in various glomerular diseases using LMD/MS.
Main Methods:
- Utilized laser microdissection and mass spectrometry (LMD/MS) for in-depth proteomic evaluation of kidney biopsy samples.
- Applied principal component analysis, volcano plots, and heatmaps for protein analysis.
Main Results:
- LMD/MS identified distinct complement profiles and pathways across different glomerular diseases, including membranous nephropathy, Ig-associated GN, C3 glomerulopathy, and IgA nephropathy.
- Demonstrated variations in complement burden and profile even within specific diseases, such as different antigens in membranous nephropathy.
- Showcased LMD/MS's ability to determine the presence of active complement fragments and quantify complement burden.
Conclusions:
- LMD/MS is a valuable tool for detailed analysis of complement proteins, regulatory proteins, and pathways in glomerular diseases.
- Accurate complement profiling using LMD/MS is crucial for personalized treatment strategies, especially with the advent of new anticomplement drugs.
