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Immune complexes and complement profile in essential mixed cryoglobulinemia before and after plasma exchange
The International Journal of Artificial Organs
|July 1, 1983
Summary
Plasma exchange (PE) reduced immune complexes in essential mixed cryoglobulinemia patients with kidney issues. However, complement component levels dropped temporarily after PE, highlighting transient effects in this cryoglobulinemia treatment.
Area of Science:
- Nephrology
- Immunology
- Hematology
Background:
- Essential mixed cryoglobulinemia (EMC) with renal involvement often presents treatment challenges.
- High-dose corticosteroids may be ineffective in some EMC patients.
Purpose of the Study:
- To evaluate the efficacy of plasma exchange (PE) in treating EMC patients with renal involvement.
- To assess the impact of PE on immune complexes and complement system activation in EMC.
Main Methods:
- Five EMC patients with renal involvement unresponsive to corticosteroids underwent 16 plasma exchanges.
- Evaluated immune complex levels (cryocrit, C1q binding), complement activity (CH50, APCH50), and complement component concentrations (C1q, C1s, C4, C3, C5, C6, B, I, H, C3d) before and after PE.
Main Results:
- PE significantly reduced cryocrit and C1q binding activity by approximately 50%.
- Basal complement profile indicated classical pathway activation with low early components (C1q, C1s, C4) and increased C3d.
- PE caused a transient decrease in complement components, which returned to baseline within 24-48 hours, irrespective of replacement fluid.
Conclusions:
- Plasma exchange can reduce immune complexes in EMC patients with renal disease.
- The observed decrease in complement components after PE is temporary and does not appear to alter the underlying complement activation pattern significantly.
- Further research is needed to understand the long-term impact and optimal use of PE in EMC management.