Correlation between sialic acid expression and infection of murine macrophages by different strains of influenza virus.
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.
Department of Microbiology and Immunology, University of Melbourne, Victoria 3010, Australia.
Michelle D
MD
Tate
Andrew G
AG
Brooks
Patrick C
PC
Reading
D000818:Animals; D002460:Cell Line; D004285:Dogs; D004847:Epithelial Cells / Q000821:virology; D019267:Hemagglutinin Glycoproteins, Influenza Virus / Q000378:metabolism; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000502:physiology*; D008264:Macrophages / Q000378:metabolism* / Q000821:virology*; D051379:Mice; D008810:Mice, Inbred C57BL; D019158:N-Acetylneuraminic Acid / Q000737:chemistry / Q000378:metabolism*; D009976:Orthomyxoviridae Infections / Q000378:metabolism*
D019267:Hemagglutinin Glycoproteins, Influenza Virus; D019158:N-Acetylneuraminic Acid