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inequalityGoal 11: Sustainable cities and communitiesGoal 12: Responsible consumption and productionGoal 13: Climate actionGoal 14: Life below waterGoal 15: Life on landGoal 16: Peace, justice and strong institutionsGoal 17: Partnership for the goalsAreasSocial sciencesMathematics and physicsChemistryEngineering sciencesInformaticsBiological sciencesAgriculture and EnvironmentMedicine, dentistry and pharmacologyHumanitiesEventsEventsEvent categoriesTalksOpen lecturesUniversity activitiesEvent areasSocial sciencesEvent locationsRokkodai 1st CampusOff-campusOnlineEvent audiencesStudentsAudienceProspective studentsCurrent studentsAlumsCorporate and societyFaculty and staff CloseNews TopCategoriesPress releasesRead in日本語2019.04.26Humanization of antibodies targeting human herpesvirus 6B Medicine, dentistry and pharmacologyInfectious diseasesImmunologyHerpesvirusAntibodyBacteria / VirusesA research group led by Professor Yasuko Mori (Division of Clinical Virology, Center for Infectious Diseases, Kobe University) have succeeded in humanization of mouse antibodies that can neutralize the infection caused by human herpesvirus 6B (HHV-6B). Infection by HHV-6B in infants can lead to complications such as encephalitis (brain inflammation) but an effective way to control the infection has not yet been found.Professor Mori’s research team created “humanized” antibodies based on the mouse (murine) antibodies for HHV-6B. The findings were published on March 6 in the online edition of the Journal of Virology, and have also been introduced in the HHV-6 Foundation Newsletter.Almost every child between the ages of six and eighteen months will become infected with HHV-6B. The initial infection causes sudden-onset fever and rash. The condition has a favorable prognosis, but roughly 150 cases a year result in encephalitis and around half of these patients are left with neurological complications. HHV-6B remains latent in our bodies after initial infection, and can reactivate when our immune system defenses are low. This can be particularly bad for patients who have received stem cell transplants, who can experience frequent and life-threatening encephalitis after transplantation.Professor Mori’s team had already identified the protein complex gH/gL/gQ1/gQ2 as an essential factor for HHV-6B infection, and the human cellular receptor CD134 (OX40) that expresses on stimulated T-cells, the targets of infection. They showed in previous studies that the interaction between this protein complex and receptor is the key to infection (Figure 1). By creating monoclonal antibodies from mice, they showed that antibodies which block the activity of the gH/gL/gQ1/gQ2 complex can be used to regulate the HHV-6B infection (figure 1). The team’s next goal is to develop clinically applicable treatment that can tackle the HHV-6B gH/gL/gQ1/gQ2 complex.Figure 1: Infection of human herpesvirus 6B to target cells and infection prevention by antibodies.However, antibodies from mice are targeted by the human immune system and destroyed when they enter our bodies, so further alterations are necessary to suppress the immune reaction in our bodies before this can be used in clinical settings. Using gene-altering technology, the team tested the humanization of mouse antibodies: they created a chimeric antibody by replacing the mouse antibodies with human antibodies in the constant domain, only leaving the parts in the variable domain that directly act against HHV-6B.In this study the team altered two types of mouse IgG antibodies to target gH and gQ1 in the HHV-6B gH/gL/gQ1/gQ2 complex. First they analyzed the DNA sequence of the mouse antibodies, and made a chimeric human-mouse gene (figure 2). They purified the chimeric antibodies produced by introducing this gene to cell cultures, and confirmed that the antibodies had maintained their effectiveness against the HHV-6B gH/gL/gQ1/gQ2 complex. By carrying out further quantitative analysis they verified that the chimera antibodies were able to block the infection of HHV-6B with the same effectiveness as mouse antibodies.Figure 2: Humanization of the human herpesvirus 6B antibodies that originate from mice (murine).This research successfully created artificial antibodies which are both effective against HHV-6B and trigger a lower response from the human immune system. These antibodies still contain parts that originate from mice, so the next step is to replace these parts with human antibodies to create antibodies that are suitable for clinical use. HHV-6B only infects humans, meaning there is no animal model for infection, and it is hard to evaluate the effectiveness of these antibodies within a living organism. In the future if animal models can be available to test this, we hope that the results can help to create antibody-based treatments for HHV-6B infection.Breakthrough on therapeutic HHV-6B neutralizing antibodiesJournal informationTitle“Humanization of the murine neutralizing antibodies against human herpesvirus 6B”DOI10.1128/JVI.02270-18AuthorsBochao Wang1, Mitsuhiro Nishimura1, Yuji Maekawa1, Toshiya Kotari1, Toshiomi Okuno2, Yasuko Mori1*1 Division of Clinical Virology, Center for Infectious Diseases, Kobe University Graduate School of Medicine2 Department of Microbiology, Hyogo College of Medicine*Corresponding authorJournalJournal of VirologyResearchersMori YasukoProfessorGraduate School of MedicineNishimura MitsuhiroAssistant ProfessorGraduate School of MedicineSDGs)">Center for Infectious DiseasesSHAREMore from these researchersFeatures2023.07.10Medicine, dentistry and pharmacologyWhat issues will remain after Covid-19 is downgraded to Class 5?Press releases2020.08.20Medicine, dentistry and pharmacologyVaccine developed for human herpesvirus 6B (HHV-6B)Press releases2018.03.22Medicine, dentistry and pharmacologyNew insights on the virus that causes shinglesMore about these topicsPress releases2023.08.17Medicine, dentistry and pharmacologyAssessment of immunological reaction to mRNA SARS CoV-2 vaccine after administration of Tixagevimab/Cilgavimab, using B cell receptor repertoire analysisPress releases2019.11.28Medicine, dentistry and pharmacologyReview paper on piRNA antiviral immunityPress releases2022.11.10Medicine, dentistry and pharmacologyThick and sticky bacteria are more resistant to antibiotics, leading to high patient mortalityPress releases2020.12.24Medicine, dentistry and pharmacologyKobe University and Sysmex Conducted Clinical Evaluation of the ELISPOT Methodページの先頭へ1-1, Rokkodai-cho, Nada-ku, Kobe, 657-8501, JAPANProspective studentsCurrent studentsAlumsCorporate and societyFaculty and staffContactAccessJobsOfficial social media accountsCampus calendarPrivacy policySite policySite map© Kobe University