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Influenza Virus Infection is not Affected by Serum Amyloid P Component

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Abstract

Background

Binding of serum amyloid P component (SAP) to its ligands, including bacteria, chromatin and amyloid fibrils, protects them from degradation, is antiopsonic and anti-immunogenic. SAP thereby enhances the virulence of pathogenic bacteria to which it binds. However SAP also contributes to host resistance against bacteria to which it does not bind. Human SAP has been reported to bind to the influenza virus and inhibit viral invasion of cells in tissue culture. We therefore investigated a possible role of SAP in either host resistance or viral virulence during influenza infection in vivo.

Materials and Methods

The clinical course of mouse adapted influenza virus infection, the host antibody response, and viral replication, were compared in wild type mice, mice with targeted deletion of the SAP gene, and mice transgenic for human SAP. The effects of reconstitution of SAP deficient mice with pure human SAP, and of a drug that specifically blocks SAP binding in vivo, were also studied. Binding of mouse and human SAP to immobilized influenza virus was compared.

Results

The presence, absence, or availability for binding of SAP in vivo had no significant or consistent effect on the course or outcome of influenza infection, or on either viral replication or the anti-viral antibody response. Mouse SAP bound much less avidly than human SAP to influenza virus.

Conclusions

In marked contrast to the dramatic effects of SAP deficiency on host resistance to different bacterial infections, mouse SAP apparently plays no significant role during infection of mice with influenza virus. Human SAP binds much more avidly than mouse SAP to the virus, but also had no effect on any of the parameters measured and is therefore unlikely to be involved in human influenza infection.

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Acknowledgments

This work was supported in part by Medical Research Council (U.K.) Programme Grant G97900510 to M.B. Pepys. We thank Dr. John Wood and Dr. Diane Major for providing mouse adapted influenza virus and for invaluable scientific and technical assistance. We thank Mrs. Beth Jones for expert preparation of the manuscript.

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Authors and Affiliations

  1. Centre for Amyloidosis and Acute Phase Proteins, Department of Medicine, Royal Free and University College Medical School, Royal Free Campus, Rowland Hill Street, London, NW3 2PF, UK

    Jeff Herbert, Winston L. Hutchinson & Mark B. Pepys

  2. Viral Diseases, Roche Discovery Welwyn, Welwyn Garden City, Herts, UK

    Jackie Carr & Jane Ives

  3. Chemistry Section, F Hoffmann-La Roche Ltd, Basel, Switzerland

    Roland Jakob-Roetne

  4. Institute of Molecular Embryology and Genetics, and Center for Animal Resources and Development, Kumamoto University, Kumamoto, Japan

    Ken-ichi Yamamura & Misao Suzuki

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  1. Jeff Herbert
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  8. Mark B. Pepys
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Correspondence to Mark B. Pepys.

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Herbert, J., Hutchinson, W.L., Carr, J. et al. Influenza Virus Infection is not Affected by Serum Amyloid P Component. Mol Med 8, 9–15 (2002). https://doi.org/10.1007/BF03401998

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  • DOI: https://doi.org/10.1007/BF03401998

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