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Journal of Virology, June 2000, p. 5190-5197, Vol. 74, No. 11
Department of Microbiology and Immunology,
University of Melbourne, Parkville, Victoria 3052, Australia
Received 4 October 1999/Accepted 1 March 2000
Influenza viruses A/PR/8/34 (PR8; H1N1), A/Aichi/68 X-31 (HKx31;
H3N2), and A/Beijing/89 X-109 (BJx109; H3N2) show marked differences in
their ability to infect murine macrophages, including resident alveolar
and peritoneal macrophages as well as the macrophage-derived cell line
J774. The hierarchy in infectivity of the viruses (PR8 < HKx31 < BJx109) resembles that of their reactivity with
mannose-binding lectins of the collectin family. Since the macrophage
mannose receptor recognizes the same spectrum of monosaccharides as the collectins do, we investigated the possible involvement of this receptor in infection of macrophages by influenza virus. In competitive binding studies, the binding of 125I-labeled mannosylated
bovine serum albumin to macrophages was inhibited by the purified
hemagglutinin and neuraminidase (HANA) glycoproteins of influenza virus
but not by HANA that had been treated with periodate to oxidize its
oligosaccharide side chains. The inhibitory activity of HANA from the
three strains of virus differed markedly and correlated with the
infectivity of each virus for macrophages. Infection of macrophages,
but not MDCK cells, by influenza virus was inhibited by yeast mannan. A
variant line of J774 cells, J774E, which expresses elevated levels of the mannose receptor, was more readily infected than J774, and the
sensitivity of J774E cells to infection was greatly reduced by culture
in the presence of D-mannose, which down-modulated mannose
receptor expression. Together, the data implicate the mannose receptor
as a major endocytic receptor in the infectious entry of influenza
virus, and perhaps other enveloped viruses, into murine macrophages.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Involvement of the Mannose Receptor in Infection of
Macrophages by Influenza Virus

*
Corresponding author. Mailing address: Department of
Microbiology and Immunology, University of Melbourne, Grattan St.,
Parkville, Victoria 3052 Australia. Phone: 61 3 9344 5702. Fax: 61 3 9347 1540. E-mail:
m.anders{at}microbiology.unimelb.edu.au.
Present address: Sir William Dunn School of Pathology, University
of Oxford, Oxford OX1 3RE, United Kingdom.
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