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Respiratory Research
Published in: Respiratory Research 1/2007

Open Access 01-12-2007 | Research

Reduced influenza viral neutralizing activity of natural human trimers of surfactant protein D

Authors: Kevan L Hartshorn, Mitchell R White, Tesfaldet Tecle, Ida Tornoe, Grith L Sorensen, Erika C Crouch, Uffe Holmskov

Published in: Respiratory Research | Issue 1/2007

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Abstract

Background

Surfactant protein D (SP-D) plays important roles in innate host defense against influenza A virus (IAV) infection. Common human polymorphisms of SP-D have been found in many human populations and associated with increased risk of certain infections. We recently reported that the Thr/Thr 11 form of SP-D is associated with low serum levels and assembles predominantly as trimers as opposed to the more common multimeric forms of SP-D.

Methods

Preliminary experiments were done to establish the effects of different monoclonal antibodies against SP-D on ability of SP-D to bind to or neutralize the virus. We then purified natural human trimeric and multimeric forms of SP-D from amniotic fluid and tested ability of these preparations to bind to IAV, to inhibit infectivity and hemagglutination activity of IAV in vitro.

Results

In initial experiments mAbs directed against different areas on the CRD of SP-D were found to have differing effects on antiviral activity. Using an mAb that did not interfere with antiviral activity of SP-D, we confirm that natural SP-D trimers had reduced ability to bind to IAV. In addition, the trimers had reduced ability to neutralize IAV as compared to natural human SP-D multimers as well as reduced hemagglutination inhibiting activity against several strains of IAV. Natural SP-D trimers also had different interactions with human neutrophil peptide defensins (HNPs) in viral neutralization assays as compared to multimeric SP-D.

Conclusion

These studies indicate that a common human polymorphic form of SP-D may modulate host defense against IAV and give impetus to clinical studies correlating this genotype with risk for IAV infection in susceptible groups. We also show that mAbs directed against different areas on the carbohydrate recognition domain of SP-D can be useful for dissecting out different functional properties of the protein.
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Metadata
Title
Reduced influenza viral neutralizing activity of natural human trimers of surfactant protein D
Authors
Kevan L Hartshorn
Mitchell R White
Tesfaldet Tecle
Ida Tornoe
Grith L Sorensen
Erika C Crouch
Uffe Holmskov
Publication date
01-12-2007
Publisher
BioMed Central
Published in
Respiratory Research / Issue 1/2007
Electronic ISSN: 1465-993X
DOI
https://doi.org/10.1186/1465-9921-8-9

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