Abstract:
:Andes virus (ANDV) causes a fatal hantavirus pulmonary syndrome (HPS) in humans and Syrian hamsters. Human alpha(v)beta(3) integrins are receptors for several pathogenic hantaviruses, and the function of alpha(v)beta(3) integrins on endothelial cells suggests a role for alpha(v)beta(3) in hantavirus directed vascular permeability. We determined here that ANDV infection of human endothelial cells or Syrian hamster-derived BHK-21 cells was selectively inhibited by the high-affinity alpha(v)beta(3) integrin ligand vitronectin and by antibodies to alpha(v)beta(3) integrins. Further, antibodies to the beta(3) integrin PSI domain, as well as PSI domain polypeptides derived from human and Syrian hamster beta(3) subunits, but not murine or bovine beta(3), inhibited ANDV infection of both BHK-21 and human endothelial cells. These findings suggest that ANDV interacts with beta(3) subunits through PSI domain residues conserved in both Syrian hamster and human beta(3) integrins. Sequencing the Syrian hamster beta(3) integrin PSI domain revealed eight differences between Syrian hamster and human beta(3) integrins. Analysis of residues within the PSI domains of human, Syrian hamster, murine, and bovine beta(3) integrins identified unique proline substitutions at residues 32 and 33 of murine and bovine PSI domains that could determine ANDV recognition. Mutagenizing the human beta(3) PSI domain to contain the L33P substitution present in bovine beta(3) integrin abolished the ability of the PSI domain to inhibit ANDV infectivity. Conversely, mutagenizing either the bovine PSI domain, P33L, or the murine PSI domain, S32P, to the residue present human beta(3) permitted PSI mutants to inhibit ANDV infection. Similarly, CHO cells transfected with the full-length bovine beta(3) integrin containing the P33L mutation permitted infection by ANDV. These findings indicate that human and Syrian hamster alpha(v)beta(3) integrins are key receptors for ANDV and that specific residues within the beta(3) integrin PSI domain are required for ANDV infection. Since L33P is a naturally occurring human beta(3) polymorphism, these findings further suggest the importance of specific beta(3) integrin residues in hantavirus infection. These findings rationalize determining the role of beta(3) integrins in hantavirus pathogenesis in the Syrian hamster model.
journal_name
J Viroljournal_title
Journal of virologyauthors
Matthys VS,Gorbunova EE,Gavrilovskaya IN,Mackow ERdoi
10.1128/JVI.01013-09subject
Has Abstractpub_date
2010-01-01 00:00:00pages
352-60issue
1eissn
0022-538Xissn
1098-5514pii
JVI.01013-09journal_volume
84pub_type
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