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Depletion of Specific Cell Populations by Complement Depletion
Published on: February 5, 2010
Complement mediated solubilization: role of the complement in the clearance of circulating immune-complexes
1Unidad de Inmunología Experimental, Hospital La Fe, Valencia.
Allergologia Et Immunopathologia
|September 1, 1994
Summary
Complement (C') solubilizes antigen/antibody complexes via the alternative pathway, generating C3b molecules. These C3b-rich complexes become soluble, lose inflammatory potential, and are cleared by Kupffer cells.
Area of Science:
- Immunology
- Complement System Biology
Background:
- Complement (C oun) possesses a previously undescribed function: solubilizing antigen/antibody complexes.
- This solubilization process, termed C oun-mediated solubilization (CMS), is primarily mediated by the alternative pathway of C oun activation.
Purpose of the Study:
- To elucidate the detailed mechanism of C oun-mediated solubilization of antigen/antibody complexes.
- To understand the biological fate and properties of solubilized immune complexes.
Main Methods:
- Investigated the role of C oun activation pathways (alternative and classical) in immune complex solubilization.
- Characterized the physicochemical and biological properties of solubilized immune complexes.
Main Results:
- The alternative pathway generates C3b molecules that deposit on antigen/antibody complexes, breaking down the precipitation meshwork.
- Solubilized immune complexes are C3b-rich, lose inflammatory potential, and do not activate C oun or interact with C3b receptors.
- These modified complexes are efficiently captured and catabolized by Kupffer cells in the liver.
Conclusions:
- Complement-mediated solubilization is a crucial mechanism for handling immune complexes.
- Solubilized immune complexes are rendered non-inflammatory and are cleared via hepatic uptake.
- This process is closely related to Immuno-Precipitation inhibition (IPI).
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