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Journal of Virology, January 2008, p. 938-948, Vol. 82, No. 2
0022-538X/08/$08.00+0     doi:10.1128/JVI.01397-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

New World Clade B Arenaviruses Can Use Transferrin Receptor 1 (TfR1)-Dependent and -Independent Entry Pathways, and Glycoproteins from Human Pathogenic Strains Are Associated with the Use of TfR1{triangledown}

Meg L. Flanagan,1 Jill Oldenburg,1 Therese Reignier,1 Nathalia Holt,1 Genevieve A. Hamilton,1 Vanessa K. Martin,1,2 and Paula M. Cannon1,2*

Saban Research Institute of Childrens Hospital Los Angeles, Los Angeles, California 90027,1 University of Southern California Keck School of Medicine, Los Angeles, California 900892

Received 26 June 2007/ Accepted 26 October 2007

Arenaviruses are rodent-borne viruses, with five members of the family capable of causing severe hemorrhagic fevers if transmitted to humans. To date, two distinct cellular receptors have been identified that are used by different pathogenic viruses, {alpha}-dystroglycan by Lassa fever virus and transferrin receptor 1 (TfR1) by certain New World clade B viruses. Our previous studies have suggested that other, as-yet-unknown receptors are involved in arenavirus entry. In the present study, we examined the use of TfR1 by the glycoproteins (GPs) from a panel of New World clade B arenaviruses comprising three pathogenic and two nonpathogenic strains. Interestingly, we found that TfR1 was only used by the GPs from the pathogenic viruses, with entry of the nonpathogenic strains being TfR1 independent. The pathogenic GPs could also direct entry into cells by TfR1-independent pathways, albeit less efficiently. A comparison of the abilities of TfR1 orthologs from different species to support arenavirus entry found that the human and feline receptors were able to enhance entry of the pathogenic strains, but that neither the murine or canine forms were functional. Since the ability to use TfR1 is a characteristic feature of the human pathogens, this interaction may represent an important target in the treatment of New World hemorrhagic fevers. In addition, the ability to use TfR1 may be a useful tool to predict the likelihood that any existing or newly discovered viruses in this family could infect humans.

* Corresponding author. Mailing address: Department of Research Immunology and Bone Marrow Transplantation, Childrens Hospital Los Angeles, 4650 Sunset Boulevard, Mailstop 62, Los Angeles, CA 90027. Phone: (323) 361-5916. Fax: (323) 361-3566. E-mail: pcannon{at}chla.usc.edu

{triangledown} Published ahead of print on 14 November 2007.

Journal of Virology, January 2008, p. 938-948, Vol. 82, No. 2
0022-538X/08/$08.00+0     doi:10.1128/JVI.01397-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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