Journal article

Publication year: 2015

Pages: 1616-1622

Journal: Arteriosclerosis, Thrombosis, and Vascular Biology

Volume number: 35

Issue number: 7

ISSN: 1079-5642

eISSN: 1524-4636

Open access status: Bronze

DOI Link: https://doi.org/10.1161/ATVBAHA.115.305259

Publisher: American Heart Association

Abstract: 

Objective In contrast to other antibodies involved in transfusion-related acute lung injury, anti-HNA-3a antibodies are incapable of inducing direct neutrophil activation and seem to interact with endothelial cells (ECs) primarily. In animal studies, anti-HNA-3a-mediated transfusion-related acute lung injury could be precipitated in the absence of neutrophils, but was stronger when neutrophils were present. In a different context the target protein of these antibodies, choline transporter-like protein-2 (CTL-2), was reported to interact with a protein of the inner ear carrying 2 von Willebrand factor (VWF) A-domains. These observations prompted us to investigate whether VWF might be involved in anti-HNA-3a-mediated neutrophil activation, and whether signaling via CD11b/CD18 is involved, as in various other experimental settings.

Approach and Results Cell adhesion demonstrated specific binding of CTL-2 to VWF. Immunoprecipitation analysis of CTL-2/CD11b/CD18 coexpressing cells indicated that anti-HNA-3a colocalizes CTL-2 and CD11b/CD18 when VWF is present. Functional studies revealed that anti-HNA-3a-mediated neutrophil agglutination is an active, protein kinase C-dependent and partially Fc-dependent process. Agglutination and the production of reactive oxygen species seem to require the formation of a trimolecular complex between the target antigen (CTL-2), CD11b/CD18 and VWF. In line with these observations, anti-HNA-3a induced less severe transfusion-related acute lung injury and less neutrophil recruitment to the alveolar space in VWF knockout mice.

Conclusions We introduce CTL-2 as a new binding partner for VWF. Interaction of neutrophils with VWF via CTL-2 allows anti-HNA-3a to induce signal transduction via CD11b/CD18, which leads to neutrophil activation and agglutination. In transfusion-related acute lung injury, this mechanism may further aggravate endothelial leakage.

Harvard Citation style: Bayat, B., Tjahjono, Y., Berghoefer, H., Werth, S., Deckmyn, H., De Meyer, S., et al. (2015) Choline Transporter-Like Protein-2 New von Willebrand Factor-Binding Partner Involved in Antibody-Mediated Neutrophil Activation and Transfusion-Related Acute Lung Injury, Arteriosclerosis, Thrombosis, and Vascular Biology, 35(7), pp. 1616-1622. https://doi.org/10.1161/ATVBAHA.115.305259

APA Citation style: Bayat, B., Tjahjono, Y., Berghoefer, H., Werth, S., Deckmyn, H., De Meyer, S., Sachs, U., & Santoso, S. (2015). Choline Transporter-Like Protein-2 New von Willebrand Factor-Binding Partner Involved in Antibody-Mediated Neutrophil Activation and Transfusion-Related Acute Lung Injury. Arteriosclerosis, Thrombosis, and Vascular Biology. 35(7), 1616-1622. https://doi.org/10.1161/ATVBAHA.115.305259