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Histologic localization of terminal complement complexes in renal diseases. An immunohistochemical study
1Second Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.
American Journal of Clinical Pathology
|February 1, 1989
Summary
Terminal complement complexes (TCCs) play varied roles in renal injury. Their presence in immune-complex glomerulonephritis suggests involvement, correlating with disease severity in IgA-nephropathy, membranous nephropathy, and lupus nephritis.
Area of Science:
- Nephrology
- Immunology
- Pathology
Background:
- Terminal complement complexes (TCCs) are key effectors of the complement system.
- Understanding TCCs' role in renal diseases is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the histologic localization of TCCs in various renal diseases.
- To compare TCC deposition patterns with clinical findings and disease mechanisms.
Main Methods:
- Immunohistochemical analysis of TCCs on renal biopsy specimens from 154 patients.
- Indirect immunoperoxidase technique on ethanol-fixed paraffin-embedded tissues.
Main Results:
- TCCs were detected in immune-complex glomerulonephritis (IC-GN) like IgA-nephropathy, membranous nephropathy, and SLE, mirroring immunoglobulin and C3 deposition.
- TCC deposition intensity correlated with renal damage markers (serum creatinine, urine protein) and specific clinical parameters (serum C4 in SLE).
- TCCs were also found in non-specific renal tissue damage, including sclerosis and tubulointerstitial lesions, independent of immune complexes.
Conclusions:
- TCCs are implicated in IC-GN pathogenesis through immune-complex-mediated mechanisms.
- Non-immune-complex-mediated roles of TCCs in renal injury are also suggested.
- TCCs exhibit diverse functions in kidney damage, depending on the underlying disease mechanism.