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Hexamerization: explaining the original sin of IgG-mediated complement activation in acute lung injury
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Hexamerization: explaining the original sin of IgG-mediated complement activation in acute lung injury
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Journal Article
Hexamerization: explaining the original sin of IgG-mediated complement activation in acute lung injury
2024
Overview
Although antibody-mediated lung damage is a major factor in transfusion-related acute lung injury (ALI), autoimmune lung disease (for example, coatomer subunit α [COPA] syndrome), and primary graft dysfunction following lung transplantation, the mechanism by which antigen-antibody complexes activate complement to induce lung damage remains unclear. In this issue of the JCI, Cleary and colleagues utilized several approaches to demonstrate that IgG forms hexamers with MHC class I alloantibodies. This hexamerization served as a key pathophysiological mechanism in alloimmune lung injury models and was mediated through the classical pathway of complement activation. Additionally, the authors provided avenues for exploring therapeutics for this currently hard-to-treat clinical entity that has several etiologies but a potentially focused mechanism.
Publisher
American Society for Clinical Investigation
