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Propagation of Activated B Cells by In Vitro Severe Fever With Thrombocytopenia Syndrome Virus Infection of Human Peripheral Blood Mononuclear Cells. 2022

Yuji Wada, and Sho Miyamoto, and Shun Iida, and Kaori Sano, and Yuko Sato, and Akira Ainai, and Kumpei Saito, and Harutaka Katano, and Hideki Hasegawa, and Tadaki Suzuki
Department of Pathology, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan.

Severe fever with thrombocytopenia syndrome (SFTS) is an emerging, life-threatening tick-borne viral hemorrhagic fever caused by SFTS virus (SFTSV). Transient appearance of plasmablastic lymphocytes in the peripheral blood of SFTS cases has been reported; however, the pathological significance of this transient burst in peripheral blood plasmablastic lymphocytes is unclear. Here, we show that SFTSV infection of human peripheral blood mononuclear cells in vitro induced propagation of atypical lymphocytes. These atypical lymphocytes were activated B cells, which were induced by secretory factors other than viral particles; these factors were secreted by SFTSV-infected B cells. Activated B cells shared morphological and immunophenotypic characteristics with B cells of plasmablast lineage observed in peripheral blood and autopsy tissues of SFTS cases. This suggests that SFTSV-infected B cells secrete factors that induce B-cell differentiation to plasmablasts, which may play an important role in pathogenesis of SFTS through the SFTSV-B cell axis.

UI MeSH Term Description Entries
D007963 Leukocytes, Mononuclear Mature LYMPHOCYTES and MONOCYTES transported by the blood to the body's extravascular space. They are morphologically distinguishable from mature granulocytic leukocytes by their large, non-lobed nuclei and lack of coarse, heavily stained cytoplasmic granules. Mononuclear Leukocyte,Mononuclear Leukocytes,PBMC Peripheral Blood Mononuclear Cells,Peripheral Blood Human Mononuclear Cells,Peripheral Blood Mononuclear Cell,Peripheral Blood Mononuclear Cells,Leukocyte, Mononuclear
D002044 Bunyaviridae Infections Virus diseases caused by the BUNYAVIRIDAE. Bunyavirus Infections,Infections, Bunyaviridae,Infections, Bunyavirus,Oropouche Fever,Oropouche Infection,Oropouche Orthobunyavirus Infection,Oropouche Virus Infection,Orthobunyavirus Infections,Bunyaviridae Infection,Bunyavirus Infection,Oropouche Fevers,Orthobunyavirus Infection,Orthobunyavirus Infection, Oropouche,Virus Infection, Oropouche
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000085142 Severe Fever with Thrombocytopenia Syndrome A tick-borne infection with SEVERE FEVER WITH THROMBOCYTOPENIA SYNDROME BUNYAVIRUS of the genus Phlebovirus. It is associated with fever, THROMBOCYTOPENIA; LEUKOCYTOPENIA, and multiorgan dysfunction. It is found in parts of Asia including China, Japan, Korea and Vietnam and can be transmitted from infected domestic animals and humans. SFTS Virus Infection,Severe Fever with Thrombocytopenia Syndrome Bunyavirus Infection,Infection, SFTS Virus,SFTS Virus Infections,Virus Infection, SFTS
D001402 B-Lymphocytes Lymphoid cells concerned with humoral immunity. They are short-lived cells resembling bursa-derived lymphocytes of birds in their production of immunoglobulin upon appropriate stimulation. B-Cells, Lymphocyte,B-Lymphocyte,Bursa-Dependent Lymphocytes,B Cells, Lymphocyte,B Lymphocyte,B Lymphocytes,B-Cell, Lymphocyte,Bursa Dependent Lymphocytes,Bursa-Dependent Lymphocyte,Lymphocyte B-Cell,Lymphocyte B-Cells,Lymphocyte, Bursa-Dependent,Lymphocytes, Bursa-Dependent
D016856 Phlebovirus A genus of the family BUNYAVIRIDAE comprising many viruses, most of which are transmitted by Phlebotomus flies and cause PHLEBOTOMUS FEVER. The type species is RIFT VALLEY FEVER VIRUS. SFTS bunyavirus,Sandfly Fever Sicilian Virus,Severe Fever with Thrombocytopenia Syndrome Bunyavirus,Phleboviruses

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