title: Measles virus infects both polarized epithelial and immune cells by using distinctive receptor-binding sites on its hemagglutinin.
abstract: Measles is one of the most contagious human infectious diseases and remains a major cause of childhood morbidity and mortality worldwide. The signaling lymphocyte activation molecule (SLAM), also called CD150, is a cellular receptor for measles virus (MV), presumably accounting for its tropism for immune cells and its immunosuppressive properties. On the other hand, pathological studies have shown that MV also infects epithelial cells at a later stage of infection, although its mechanism has so far been unknown. In this study, we show that wild-type MV can infect and produce syncytia in human polarized epithelial cell lines independently of SLAM and CD46 (a receptor for the vaccine strains of MV). Progeny viral particles are released exclusively from the apical surface of these polarized epithelial cell lines. We have also identified amino acid residues on the MV attachment protein that are likely to interact with a putative receptor on epithelial cells. All of these residues have aromatic side chains and may form a receptor-binding pocket located in a different position from the putative SLAM- and CD46-binding sites on the MV attachment protein. Thus, our results indicate that MV has an intrinsic ability to infect both polarized epithelial and immune cells by using distinctive receptor-binding sites on the attachment protein corresponding to each of their respective receptors. The ability of MV to infect polarized epithelial cells and its exclusive release from the apical surface may facilitate its efficient transmission via aerosol droplets, resulting in its highly contagious nature.
authors.affiliation: Department of Virology, Faculty of Medicine, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. mtakeda@virology.med.kyushu-u.ac.jp
authors.forename: Maino
authors.initials: M
authors.lastname: Tahara
authors.forename: Makoto
authors.initials: M
authors.lastname: Takeda
authors.forename: Yuta
authors.initials: Y
authors.lastname: Shirogane
authors.forename: Takao
authors.initials: T
authors.lastname: Hashiguchi
authors.forename: Shinji
authors.initials: S
authors.lastname: Ohno
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yanagi
mesh_terms: D000818:Animals; D015703:Antigens, CD; D001665:Binding Sites; D002460:Cell Line; D016764:Cell Polarity; D004847:Epithelial Cells / Q000821:virology*; D006388:Hemagglutinins / Q000378:metabolism*; D006801:Humans; D007107:Immune System / Q000166:cytology / Q000821:virology; D008214:Lymphocytes / Q000821:virology*; D008459:Measles virus / Q000472:pathogenicity*; D051916:Membrane Cofactor Protein; D011956:Receptors, Cell Surface; D011991:Receptors, Virus / Q000378:metabolism; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1; D053585:Virus Attachment
chemical_list: D015703:Antigens, CD; C497857:CD46 protein, human; D006388:Hemagglutinins; D051916:Membrane Cofactor Protein; D011956:Receptors, Cell Surface; D011991:Receptors, Virus; C000604059:SLAMF1 protein, human; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1