Integrin alphavbeta1 promotes infection by human metapneumovirus.

Abstract

Human metapneumovirus (hMPV) is a recently described paramyxovirus that causes lower respiratory infections in children and adults worldwide. The hMPV fusion (F) protein is a membrane-anchored glycoprotein and major protective antigen. All hMPV F protein sequences determined to date contain an Arg-Gly-Asp (RGD) sequence, suggesting that F engages RGD-binding integrins to mediate cell entry. The divalent cation chelator EDTA, which disrupts heterodimeric integrin interactions, inhibits infectivity of hMPV but not the closely related respiratory syncytial virus (RSV), which lacks an RGD motif. Function-blocking antibodies specific for alphavbeta1 integrin inhibit infectivity of hMPV but not RSV. Transfection of nonpermissive cells with alphav or beta1 cDNAs confers hMPV infectivity, whereas reduction of alphav and beta1 integrin expression by siRNA inhibits hMPV infection. Recombinant hMPV F protein binds to cells, whereas Arg-Gly-Glu (RGE)-mutant F protein does not. These data suggest that alphavbeta1 integrin is a functional receptor for hMPV.

• Authors: Gabriella Cseke, Melissa S Maginnis, Reagan G Cox, Sharon J Tollefson, Amy B Podsiad, David W Wright, Terence S Dermody, John V Williams
• Journal: Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 106 Issue 5 Pg. 1566-71 (Feb 03 2009) ISSN: 1091-6490 [Electronic] United States
• PMID: 19164533 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Antibodies, Viral
• RNA, Small Interfering
• Receptors, Vitronectin
• Viral Fusion Proteins
• integrin alphavbeta1

Topics

• Animals
• Antibodies, Viral (immunology)
• Humans
• Metapneumovirus (immunology, pathogenicity)
• RNA, Small Interfering
• Receptors, Vitronectin (immunology, physiology)
• Swine
• Transfection
• Viral Fusion Proteins (chemistry, physiology)
• Virulence (physiology)