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Journal of Virology, September 2008, p. 8942-8946, Vol. 82, No. 17
0022-538X/08/$08.00+0 doi:10.1128/JVI.00676-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka 812-8582,1 Department of Pediatrics, Hokkaido University Graduate School of Medicine, Sapporo 060-8638,2 Pediatric Clinic, Touei Hospital, Kita-41, Higashi-6, Higashi-ku, Sapporo 007-0841, Japan3
Received 27 March 2008/ Accepted 10 June 2008
Human metapneumovirus (HMPV) is a major causative agent of severe bronchiolitis and pneumonia. Its fusion (F) protein must be cleaved by host proteases to cause membrane fusion, a critical step for virus infection. By generating Vero cells constitutively expressing the transmembrane serine protease TMPRSS2 and green fluorescent protein-expressing recombinant HMPV, we show that TMPRSS2, which is expressed in the human lung epithelium, cleaves the HMPV F protein efficiently and supports HMPV multiplication. The results indicate that TMPRSS2 is a possible candidate protease involved in the development of lower respiratory tract illness in HMPV-infected patients.
Published ahead of print on 18 June 2008.
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