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Circulating immune complexes and complement breakdown product C3d in glomerulonephritis and kidney transplantation
Acta Pathologica, Microbiologica, Et Immunologica Scandinavica. Section C, Immunology
|August 1, 1984
Summary
Elevated C3d levels are common in glomerulonephritis and renal transplant patients, often linked to kidney function but not directly to immune complexes or transplant rejection. Immunosuppression may lower C3d in transplant recipients.
Area of Science:
- Nephrology
- Immunology
- Clinical Chemistry
Background:
- Circulating immune complexes (CIC) and complement activation products like C3d are implicated in kidney diseases.
- Glomerulonephritis (GN) and renal transplantation involve complex immunological processes.
Purpose of the Study:
- To investigate the levels and significance of CIC and C3d in patients with GN and renal transplants.
- To determine the relationship between CIC, C3d, renal function, and transplant outcomes.
Main Methods:
- Measurement of CIC using a Clq-binding assay.
- Quantification of C3d via double-decker rocket immunoelectrophoresis.
- Analysis in 81 GN patients and 53 renal transplant recipients.
Main Results:
- Elevated C3d was found in 45 GN patients, particularly those with specific types of GN (membranoproliferative, diffuse sclerosing, lupus nephritis, Wegener's).
- No correlation was observed between CIC and C3d levels in GN patients.
- Elevated C3d correlated with impaired renal function and heavy proteinuria, but also with improving function, suggesting complex associations.
- In renal transplant patients, C3d levels normalized within a month post-transplant, and immunosuppressive therapy appeared to reduce C3d.
- CIC and elevated C3d were not predictive of acute rejection or late graft failure.
Conclusions:
- C3d elevation in GN is frequent and associated with renal inflammation and function, but its precise role requires further study.
- CIC and C3d levels do not appear to be reliable markers for predicting rejection or failure in renal transplants.
- C3d levels in renal transplant recipients normalize post-transplant, indicating successful graft function and potentially the impact of immunosuppression.