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Complement receptor mediates enhanced flavivirus replication in macrophages
The Journal of Experimental Medicine
|July 1, 1983
Abstract:
Evidence is presented that M phi complement receptors (CR3) mediate IgM-dependent enhancement of flavivirus replication in the presence of complement. Enhancement is blocked by pretreatment of macrophages with monoclonal antibody Ml/70, which inhibits CR3 binding, but not by pretreatment with monoclonal antibody 2.4G2, which inhibits FcR binding.
Insights
Complement receptors (CR3) on macrophages enhance flavivirus replication when IgM antibodies are present. This enhancement is specifically blocked by targeting CR3, not Fc receptors, indicating a key role for CR3 in flavivirus infection.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Flavivirus infections pose significant global health challenges.
- Macrophage complement receptors play a role in immune responses.
- Antibody-dependent enhancement (ADE) can exacerbate viral infections.
Purpose of the Study:
- To investigate the role of macrophage complement receptors in IgM-dependent flavivirus replication.
- To determine whether complement receptors (CR3) or Fc receptors mediate this enhancement.
Main Methods:
- Utilized macrophages and flavivirus in cell culture experiments.
- Employed monoclonal antibodies (mAb Ml/70 and mAb 2.4G2) to block specific receptors.
- Assessed flavivirus replication levels following antibody treatments.
Main Results:
- Macrophage complement receptors type 3 (CR3) mediate IgM-dependent enhancement of flavivirus replication.
- Pretreatment with mAb Ml/70, which inhibits CR3 binding, blocked this enhancement.
- Pretreatment with mAb 2.4G2, which inhibits Fc receptor binding, did not block the enhancement.
Conclusions:
- CR3, not Fc receptors, is the primary mediator of IgM-dependent enhancement of flavivirus replication in macrophages.
- Targeting CR3 may offer a novel therapeutic strategy for flavivirus infections.