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Non-complement-dependent adsorption of soluble immune complexes to human red cells
Clinical and Experimental Immunology
|November 1, 1983
Summary
Human red blood cells (RBC) bind heat-aggregated IgG and soluble immune complexes (IC). This binding involves both complement-dependent and non-complement-dependent pathways, suggesting multiple receptor interactions on RBCs for immune complex clearance.
Area of Science:
- Immunology
- Hematology
- Biochemistry
Background:
- Immune complexes (IC) play a crucial role in immune responses and can mediate clearance via interactions with various cells.
- Red blood cells (RBCs) have been implicated in the transport and clearance of ICs, although the precise mechanisms are not fully elucidated.
Purpose of the Study:
- To investigate the binding of heat-aggregated IgG and soluble ICs to human O+ RBCs.
- To explore the roles of complement and potential receptors in mediating this binding.
Main Methods:
- Preparation of heat-aggregated IgG and soluble ICs using specific antigen-antibody systems (human serum albumin/rabbit anti-serum albumin and tetanus toxoid/rabbit antiserum).
- Incubation of prepared ICs with human O+ RBCs.
- Assessment of IC binding to RBCs under various conditions, including presence or absence of opsonization and complement.
Main Results:
- Heat-aggregated IgG and soluble ICs demonstrated binding to human O+ RBCs.
- Binding was more pronounced for soluble ICs prepared at antigen excess.
- Binding occurred even with non-opsonized aggregates or ICs formed without complement, indicating non-complement-dependent interactions.
Conclusions:
- Human RBCs possess mechanisms for binding both aggregated IgG and soluble ICs.
- Two potential receptor systems are suggested: the classical C3b receptor and a non-complement-dependent receptor, possibly recognizing the Fc region of immunoglobulins.