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C1 activation and dissociation in disease.
Immunology Letters
|February 1, 1987
Summary
This study reveals two distinct C1 complexes involving C1 inactivator (C1 IA) and activated C1r-C1s. These complexes differ in C1s activation state, with implications for understanding complement system regulation in health and rheumatoid arthritis.
Area of Science:
- Biochemistry
- Immunology
- Complement System
Background:
- The complement system plays a crucial role in innate and adaptive immunity.
- C1 inactivator (C1 IA) is a key regulator of the classical complement pathway.
- Understanding the composition of C1 complexes is vital for elucidating complement regulation.
Purpose of the Study:
- To investigate the composition of C1 complexes containing C1 IA, C1r, and C1s.
- To differentiate C1 complexes under various activation conditions in normal serum.
- To analyze C1 complexes in synovial fluids and sera from rheumatoid arthritis patients.
Main Methods:
- Analysis of serum and synovial fluid using PAGE and immunoblotting.
- Isolation of C1 complexes using Sepharose beads coated with anti-C1s F(ab')2 fragments.
- Electrophoretic analysis with intermediate gels for complex differentiation.
Main Results:
- Aggregated IgG (AGG) activation yielded C1 IA complexed with fully activated C1r and C1s.
- Serum incubated without activators showed C1 IA with activated C1r and proenzyme C1s.
- Rheumatoid arthritis synovial fluids contained C1 IA with activated C1r-C1s, while sera had C1 IA with activated C1r-proenzyme C1s.
Conclusions:
- Two distinct C1 IA-C1r-C1s complexes exist, differing in C1s activation state.
- These complexes exhibit differential distribution in rheumatoid arthritis patients.
- Findings provide insights into complement regulation in inflammatory conditions.