start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=1 article-no= start-page=160 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=20220116 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Nectin-2 Acts as a Viral Entry Mediated Molecule That Binds to Human Herpesvirus 6B Glycoprotein B en-subtitle= kn-subtitle= en-abstract= kn-abstract=Human herpesvirus 6B (HHV-6B) is a T-lymphotropic virus and the etiological agent of exanthem subitum. HHV-6B is present in a latent or persistent form after primary infection and is produced in the salivary glands or transmitted to this organ. Infected individuals continue to secrete the virus in their saliva, which is thus considered a source for virus transmission. HHV-6B primarily propagates in T cells because its entry receptor, CD134, is mainly expressed by activated T cells. The virus then spreads to the host's organs, including the salivary glands, nervous system, and liver. However, CD134 expression is not detected in these organs. Therefore, HHV-6B may be entering cells via a currently unidentified cell surface molecule, but the mechanisms for this have not yet been investigated. In this study, we investigated a CD134-independent virus entry mechanism in the parotid-derived cell line HSY. First, we confirmed viral infection in CD134-membrane unanchored HSY cells. We then determined that nectin cell adhesion molecule 2 (nectin-2) mediated virus entry and that HHV-6B-insensitive T-cells transduced with nectin-2 were transformed into virus-permissive cells. We also found that virus entry was significantly reduced in nectin-2 knockout parotid-derived cells. Furthermore, we showed that HHV-6B glycoprotein B (gB) interacted with the nectin-2 V-set domain. The results suggest that nectin-2 acts as an HHV-6B entry-mediated protein. en-copyright= kn-copyright= en-aut-name=OgawaHirohito en-aut-sei=Ogawa en-aut-mei=Hirohito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=FujikuraDaisuke en-aut-sei=Fujikura en-aut-mei=Daisuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NambaHikaru en-aut-sei=Namba en-aut-mei=Hikaru kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=YamashitaNobuko en-aut-sei=Yamashita en-aut-mei=Nobuko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=HondaTomoyuki en-aut-sei=Honda en-aut-mei=Tomoyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=YamadaMasao en-aut-sei=Yamada en-aut-mei=Masao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= affil-num=1 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=2 en-affil=School of Veterinary Medicine, Kitasato University kn-affil= affil-num=3 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=4 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=5 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=6 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= en-keyword=HHV-6B kn-keyword=HHV-6B en-keyword=nectin-2 kn-keyword=nectin-2 en-keyword=CD112 kn-keyword=CD112 en-keyword=CD134 kn-keyword=CD134 en-keyword=virus entry kn-keyword=virus entry en-keyword=glycoprotein B kn-keyword=glycoprotein B END start-ver=1.4 cd-journal=joma no-vol=81 cd-vols= no-issue=8 article-no= start-page=1191 end-page=1196 dt-received= dt-revised= dt-accepted= dt-pub-year=2019 dt-pub=20190824 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Risk assessment for hepatitis E virus infection from domestic pigs introduced into an experimental animal facility in a medical school en-subtitle= kn-subtitle= en-abstract= kn-abstract= Hepatitis E virus (HEV) is known to cause zoonotic infections from pigs, wild boars and deer. Domestic pigs have been used as an experimental animal model in medical research and training; however, the risks of HEV infection from pigs during animal experiments are largely unknown. Here, we retrospectively investigated the seroprevalence and detection rates of viral RNA in 73 domestic pigs (average 34.5 kg) introduced into an animal experimental facility in a medical school during 2012-2016. We detected anti-HEV immunoglobulin G antibodies in 24 of 73 plasma samples (32.9%), though none of the samples were positive for viral RNA. Plasma samples of 18 pigs were sequentially monitored and were classified into four patterns: sustained positive (5 pigs), sustained negative (5 pigs), conversion to positive (6 pigs) and conversion to negative (2 pigs). HEV genomes were detected in 2 of 4 liver samples from pigs that were transported from the same farm during 2016-2017. Two viral sequences of the overlapping open reading frame (ORF) 2/3 region (97 bp) were identical and phylogenetically fell into genotype 3. A 459-bp length of the ORF2 region of an amplified fragment from a pig transported in 2017 was clustered with the wbJYG1 isolate (subgenotype 3b) with 91.5% (420/459 bp) nucleotide identity. Based on our results, we suggest that domestic pigs introduced into animal facilities carry a potential risk of HEV infection to researchers, trainees and facility staff. Continuous surveillance and precautions are important to prevent HEV infection in animal facilities. en-copyright= kn-copyright= en-aut-name=OgawaHirohito en-aut-sei=Ogawa en-aut-mei=Hirohito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HirayamaHaruko en-aut-sei=Hirayama en-aut-mei=Haruko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TanakaSatsuki en-aut-sei=Tanaka en-aut-mei=Satsuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=YataNorio en-aut-sei=Yata en-aut-mei=Norio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=NambaHikaru en-aut-sei=Namba en-aut-mei=Hikaru kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=YamashitaNobuko en-aut-sei=Yamashita en-aut-mei=Nobuko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=YonemitsuKenzo en-aut-sei=Yonemitsu en-aut-mei=Kenzo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=MaedaKen en-aut-sei=Maeda en-aut-mei=Ken kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=MominokiKatsumi en-aut-sei=Mominoki en-aut-mei=Katsumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=YamadaMasao en-aut-sei=Yamada en-aut-mei=Masao kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= affil-num=1 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=2 en-affil=Department of Animal Resources, Advanced Science Research Center, Okayama University kn-affil= affil-num=3 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=4 en-affil=Department of Animal Resources, Advanced Science Research Center, Okayama University kn-affil= affil-num=5 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=6 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=7 en-affil=Laboratory of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Yamaguchi University kn-affil= affil-num=8 en-affil=Laboratory of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Yamaguchi University kn-affil= affil-num=9 en-affil=Department of Animal Resources, Advanced Science Research Center, Okayama University kn-affil= affil-num=10 en-affil=Department of Virology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, kn-affil= en-keyword=animal experimental facility kn-keyword=animal experimental facility en-keyword=domestic pig kn-keyword=domestic pig en-keyword=hepatitis E virus kn-keyword=hepatitis E virus en-keyword=zoonosis kn-keyword=zoonosis END start-ver=1.4 cd-journal=joma no-vol=117 cd-vols= no-issue=3 article-no= start-page=219 end-page=224 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=20060104 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Characterization and usefulness of a monoclonal antibody against human herpesvirus-7 DNA polymerase processivity factor kn-title=ヒトヘルペスウイルス7型のDNA ポリメラーゼサブユニットに対する単クローン抗体の性状と有用性 en-subtitle= kn-subtitle= en-abstract= kn-abstract=A monoclonal antibody (MAb), IK17, was developed and found useful for the analysis of human herpesvirus-7 (HHV7) genome replication. In Western blot analysis, the MAb IK17 specifically detected an HHV7 DNA polymerase subunit,U27 protein,expressed in both Escherichia coli (E.Coli)and HHV7-infected cells.Analysis by the same method of truncated U27 proteins expressed in E. Coli demonstrated that the MAb IK17 recognizes an epitope between amino acid 1 and 133 of the U27 protein.The indirect immunofluorescence (IF)method with MAb IK17 detected an unexpected reduction of U27 protein in the infected cells that were treated with a viral DNA polymerase inhibitor,phosphonoacetic acid (PAA),although no reduction of U27 mRNA was observed in the cells by Northern blot analysis. The data suggest the possible usefulness of the MAb IK17 for obtaining clues to characterize an unknown feature of the U27 protein. Immunoprecipitation experiments with the MAb IK17 enabled to detect at least four U27 protein-associated phosphorylated polypeptides in addition to the U27 protein itself.The result indicates the usefulness of the MAb IK17 for qualitative and quantitative analysis of the U27 proteinassociated viral and cellular factors. These analyses contribute to elucidation of the HHV7 genome replication system. en-copyright= kn-copyright= en-aut-name=NambaHikaru en-aut-sei=Namba en-aut-mei=Hikaru kn-aut-name=難波ひかる kn-aut-sei=難波 kn-aut-mei=ひかる aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院医歯薬学総合研究科 病原ウイルス学 en-keyword=ヒトヘルペスウイルス7型 (Human Herpesvirus-7) kn-keyword=ヒトヘルペスウイルス7型 (Human Herpesvirus-7) en-keyword=DNA polymerase processivity factor kn-keyword=DNA polymerase processivity factor en-keyword=単クローン抗体 (monoclonal antibody) kn-keyword=単クローン抗体 (monoclonal antibody) END