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From the genetic study of MV isolates obtained from SSPE patients, it is thought that defects of the matrix (M) protein play a crucial role in MV pathogenicity in the CNS. In this study, we report several notable mutations in the extracellular domain of the MV fusion (F) protein, including those found in multiple SSPE strains. The F proteins with these mutations induced syncytium formation in cells lacking SLAM and nectin 4 (receptors used by wild-type MV), including human neuronal cell lines, when expressed together with the attachment protein hemagglutinin. Moreover, recombinant viruses with these mutations exhibited neurovirulence in suckling hamsters, unlike the parental wild-type MV, and the mortality correlated with their fusion activity. In contrast, the recombinant MV lacking the M protein did not induce syncytia in cells lacking SLAM and nectin 4, although it formed larger syncytia in cells with either of the receptors. Since human neuronal cells are mainly SLAM and nectin 4 negative, fusion-enhancing mutations in the extracellular domain of the F protein may greatly contribute to MV spread via cell-to-cell fusion in the CNS, regardless of defects of the M protein.<\/jats:p>","DOI":"10.1128\/jvi.02632-12","type":"journal-article","created":{"date-parts":[[2012,12,20]],"date-time":"2012-12-20T10:12:43Z","timestamp":1355998363000},"page":"2648-2659","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":73,"title":["Mutant Fusion Proteins with Enhanced Fusion Activity Promote Measles Virus Spread in Human Neuronal Cells and Brains of Suckling Hamsters"],"prefix":"10.1128","volume":"87","author":[{"given":"Shumpei","family":"Watanabe","sequence":"first","affiliation":[{"name":"Department of Virology and Department of Neuropathology, Kyushu University, Fukuoka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuta","family":"Shirogane","sequence":"additional","affiliation":[{"name":"Department of Virology and Department of Neuropathology, Kyushu University, Fukuoka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoshi O.","family":"Suzuki","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Kyushu University, Fukuoka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoshi","family":"Ikegame","sequence":"additional","affiliation":[{"name":"Department of Virology and Department of Neuropathology, Kyushu University, Fukuoka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ritsuko","family":"Koga","sequence":"additional","affiliation":[{"name":"Department of Virology and Department of Neuropathology, Kyushu University, Fukuoka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yusuke","family":"Yanagi","sequence":"additional","affiliation":[{"name":"Department of Virology and Department of Neuropathology, Kyushu University, Fukuoka, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"235","reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/path.1873"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1086\/497169"},{"key":"e_1_3_2_4_2","first-page":"1551","volume-title":"Fields virology","author":"Griffin DE","year":"2007","unstructured":"GriffinDE. 2007. 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