Elsevier

Microbes and Infection

Volume 13, Issue 2, February 2011, Pages 202-207
Microbes and Infection

Short communication
Correlation between sialic acid expression and infection of murine macrophages by different strains of influenza virus

https://doi.org/10.1016/j.micinf.2010.10.004Get rights and content
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Abstract

The mouse-adapted A/PR/8/34 (PR8; H1N1) virus infects airway macrophages poorly and is virulent in mice. Herein, we have investigated factors contributing to the ability of PR8 to evade murine macrophages. We demonstrate that the hemagglutinin of PR8 binds preferentially to α(2,3)-linked sialic acid (SA) and that murine macrophages express α(2,6)-linked SA. Moreover, resialylation of macrophages to express α(2,3)-linked SA restored susceptibility to PR8. Thus, during adaptation of human influenza viruses to growth in mice, a switch in receptor specificity from α(2,6)-linked SA to α(2,3)-linked SA is likely to favour evasion of attachment, entry and destruction by airway macrophages.

Keywords

Influenza
Macrophage
Receptor

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