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Classical pathway of complement activation in normal and diseased human glomeruli
J Zwirner1, E Felber, V Herzog
1Institut für Immunologie, Universität München, Munich, Federal Republic of Germany.
Kidney International
|December 1, 1989
Summary
This study reveals that C4d fragment in normal glomeruli indicates continuous classical complement pathway activation. This activation is triggered by physiological deposition of IgM-containing immune complexes in the kidney.
Area of Science:
- Nephrology
- Immunology
- Histopathology
Background:
- The classical complement pathway plays a crucial role in immune responses and renal pathology.
- Understanding complement component deposition in renal tissues is vital for diagnosing kidney diseases.
Purpose of the Study:
- To investigate the deposition patterns of complement components in normal and diseased human renal tissues.
- To elucidate the role of C4d fragment in the classical complement pathway activation within the glomeruli.
Main Methods:
- Indirect immunoperoxidase technique using monoclonal antibodies against complement components.
- Histological examination of normal and glomerulonephritis kidney biopsies.
- Light and immunoelectron microscopy for detailed localization of C4d, IgM, and C4 binding protein (C4bp).
Main Results:
- Prominent C4d staining observed in glomeruli and renal arterioles of normal kidneys.
- C4d deposition localized to mesangial areas and subendothelial glomerular basement membrane (GBM).
- Diseased kidneys showed stronger, diffuse C4d staining patterns compared to segmental patterns in normal kidneys, correlating with IgM/IgG deposits and C4bp.
Conclusions:
- C4d fragment in normal human glomeruli signifies continuous local complement activation via the classical pathway.
- This activation is induced by physiological deposition of IgM-containing immune complexes.
- The findings provide insights into complement-mediated mechanisms in renal health and disease.