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[Alternative complement pathway activation by anti-band 3 antibodies]
H U Lutz1, P Stammler, C Furter
1Laboratorium für Biochemie, ETH Zürich.
Schweizerische Medizinische Wochenschrift
|November 14, 1987
Summary
Naturally occurring antibodies targeting red blood cell band 3 protein trigger complement C3b deposition. This mechanism, involving C3b-anti-band 3 complexes, is key to clearing aged red blood cells.
Area of Science:
- Immunology
- Complement system
- Red blood cell biology
Context:
- Naturally occurring antibodies against red blood cell band 3 protein.
- Alternative complement pathway activation.
- Opsonization of red blood cells.
Purpose:
- Investigate the role of anti-band 3 antibodies in complement activation.
- Determine if C3b-anti-band 3 complexes are involved in clearing senescent red blood cells.
Summary:
- Antibodies to red blood cell band 3 protein induce C3b deposition via the alternative complement pathway.
- This process requires an alternative C3 convertase involving C3b bound to anti-band 3.
- Covalently linked C3b and IgG complexes were isolated from senescent red blood cell membranes.
Impact:
- Elucidates a mechanism for red blood cell clearance.
- Highlights the role of the complement system in aging.
- Provides insights into autoimmune responses against red blood cells.