LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 27

Search options

  1. Article ; Online: Macacine alphaherpesvirus 1 (B Virus) Infection in Humans, Japan, 2019

    Souichi Yamada / Harutaka Katano / Yuko Sato / Tadaki Suzuki / Akihiko Uda / Keita Ishijima / Motoi Suzuki / Daigo Yamada / Shizuko Harada / Hitomi Kinoshita / Phu Hoang Anh Nguyen / Hideki Ebihara / Ken Maeda / Masayuki Saijo / Shuetsu Fukushi

    Emerging Infectious Diseases, Vol 30, Iss 1, Pp 177-

    2024  Volume 179

    Abstract: Two human patients with Macacine alphaherpesvirus 1 infection were identified in Japan in 2019. Both patients had worked at the same company, which had a macaque facility. The rhesus-genotype B virus genome was detected in cerebrospinal fluid samples ... ...

    Abstract Two human patients with Macacine alphaherpesvirus 1 infection were identified in Japan in 2019. Both patients had worked at the same company, which had a macaque facility. The rhesus-genotype B virus genome was detected in cerebrospinal fluid samples from both patients.
    Keywords Macacine alphaherpesvirus 1 ; B virus ; viruses ; zoonoses ; Japan ; Medicine ; R ; Infectious and parasitic diseases ; RC109-216
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher Centers for Disease Control and Prevention
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  2. Article ; Online: Inactivation of severe fever with thrombocytopenia syndrome virus for improved laboratory safety

    Toshihiko Harada / Shuetsu Fukushi / Takeshi Kurosu / Tomoki Yoshikawa / Masayuki Shimojima / Kiyoshi Tanabayashi / Masayuki Saijo

    Journal of Biosafety and Biosecurity, Vol 2, Iss 1, Pp 31-

    2020  Volume 35

    Abstract: Summary: Severe fever with thrombocytopenia syndrome (SFTS), a tick-borne infectious disease with high mortality, is diagnosed by the serological testing of serum samples from patients in the acute and convalescent phases and/or by direct detection of ... ...

    Abstract Summary: Severe fever with thrombocytopenia syndrome (SFTS), a tick-borne infectious disease with high mortality, is diagnosed by the serological testing of serum samples from patients in the acute and convalescent phases and/or by direct detection of the SFTS virus (SFTSV). Conventionally, heat and UV treatments have been used to inactivate the viruses present in serum samples before performing the serological assays. Here, we examined the inactivation conditions optimal for SFTSV-containing serum samples to ensure the safety of laboratory workers while maintaining the accuracy of serological assay results simultaneously. Heating human serum samples spiked with SFTSV to 60 °C for 30 min or exposing them to UV irradiation for 30 min, reduced the infectious virus titer below the limit of detection. SFTSV in sera from patients in the acute phase of SFTS was completely inactivated by heating to 60 °C for 30 min, followed by UV irradiation for 10 min. This inactivation procedure had minimal impact on the performance of SFTSV antibody detection tests. The data provided herein can serve as a guide for laboratory workers and researchers working with SFTS serological tests.
    Keywords Biosafety ; Inactivation ; Severe fever with thrombocytopenia syndrome (SFTSV) ; Serology ; Biology (General) ; QH301-705.5
    Language English
    Publishing date 2020-03-01T00:00:00Z
    Publisher KeAi Communications Co., Ltd.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  3. Article ; Online: Dengue virus infection induces selective expansion of Vγ4 and Vγ6TCR γδ T cells in the small intestine and a cytokine storm driving vascular leakage in mice.

    Takeshi Kurosu / Daisuke Okuzaki / Yusuke Sakai / Mohamad Al Kadi / Supranee Phanthanawiboon / Yasusi Ami / Masayuki Shimojima / Tomoki Yoshikawa / Shuetsu Fukushi / Noriyo Nagata / Tadaki Suzuki / Daisuke Kamimura / Masaaki Murakami / Hideki Ebihara / Masayuki Saijo

    PLoS Neglected Tropical Diseases, Vol 17, Iss 11, p e

    2023  Volume 0011743

    Abstract: Dengue is a major health problem in tropical and subtropical regions. Some patients develop a severe form of dengue, called dengue hemorrhagic fever, which can be fatal. Severe dengue is associated with a transient increase in vascular permeability. A ... ...

    Abstract Dengue is a major health problem in tropical and subtropical regions. Some patients develop a severe form of dengue, called dengue hemorrhagic fever, which can be fatal. Severe dengue is associated with a transient increase in vascular permeability. A cytokine storm is thought to be the cause of the vascular leakage. Although there are various research reports on the pathogenic mechanism, the complete pathological process remains poorly understood. We previously reported that dengue virus (DENV) type 3 P12/08 strain caused a lethal systemic infection and severe vascular leakage in interferon (IFN)-α/β and γ receptor knockout mice (IFN-α/β/γRKO mice), and that blockade of TNF-α signaling protected mice. Here, we performed transcriptome analysis of liver and small intestine samples collected chronologically from P12/08-infected IFN-α/β/γRKO mice in the presence/absence of blockade of TNF-α signaling and evaluated the cytokine and effector-level events. Blockade of TNF-α signaling mainly protected the small intestine but not the liver. Infection induced the selective expansion of IL-17A-producing Vγ4 and Vγ6 T cell receptor (TCR) γδ T cells in the small intestine, and IL-17A, together with TNF-α, played a critical role in the transition to severe disease via the induction of inflammatory cytokines such as TNF-α, IL-1β, and particularly the excess production of IL-6. Infection also induced the infiltration of neutrophils, as well as neutrophil collagenase/matrix metalloprotease 8 production. Blockade of IL-17A signaling reduced mortality and suppressed the expression of most of these cytokines, including TNF-α, indicating that IL-17A and TNF-α synergistically enhance cytokine expression. Blockade of IL-17A prevented nuclear translocation of NF-κB p65 in stroma-like cells and epithelial cells in the small intestine but only partially prevented recruitment of immune cells to the small intestine. This study provides an overall picture of the pathogenesis of infection in individual mice at the cytokine and effector ...
    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Subject code 570
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  4. Article ; Online: Construction of a recombinant vaccine expressing Nipah virus glycoprotein using the replicative and highly attenuated vaccinia virus strain LC16m8.

    Shumpei Watanabe / Tomoki Yoshikawa / Yoshihiro Kaku / Takeshi Kurosu / Shuetsu Fukushi / Satoko Sugimoto / Yuki Nishisaka / Hikaru Fuji / Glenn Marsh / Ken Maeda / Hideki Ebihara / Shigeru Morikawa / Masayuki Shimojima / Masayuki Saijo

    PLoS Neglected Tropical Diseases, Vol 17, Iss 12, p e

    2023  Volume 0011851

    Abstract: Nipah virus (NiV) is a highly pathogenic zoonotic virus that causes severe encephalitis and respiratory diseases and has a high mortality rate in humans (>40%). Epidemiological studies on various fruit bat species, which are natural reservoirs of the ... ...

    Abstract Nipah virus (NiV) is a highly pathogenic zoonotic virus that causes severe encephalitis and respiratory diseases and has a high mortality rate in humans (>40%). Epidemiological studies on various fruit bat species, which are natural reservoirs of the virus, have shown that NiV is widely distributed throughout Southeast Asia. Therefore, there is an urgent need to develop effective NiV vaccines. In this study, we generated recombinant vaccinia viruses expressing the NiV glycoprotein (G) or fusion (F) protein using the LC16m8 strain, and examined their antigenicity and ability to induce immunity. Neutralizing antibodies against NiV were successfully induced in hamsters inoculated with LC16m8 expressing NiV G or F, and the antibody titers were higher than those induced by other vaccinia virus vectors previously reported to prevent lethal NiV infection. These findings indicate that the LC16m8-based vaccine format has superior features as a proliferative vaccine compared with other poxvirus-based vaccines. Moreover, the data collected over the course of antibody elevation during three rounds of vaccination in hamsters provide an important basis for the clinical use of vaccinia virus-based vaccines against NiV disease. Trial Registration: NCT05398796.
    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Subject code 570
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  5. Article ; Online: Non-Omicron breakthrough infection with higher viral load and longer vaccination-infection interval improves SARS-CoV-2 BA.4/5 neutralization

    Sho Miyamoto / Takeshi Arashiro / Akira Ueno / Takayuki Kanno / Shinji Saito / Harutaka Katano / Shun Iida / Akira Ainai / Seiya Ozono / Takuya Hemmi / Yuichiro Hirata / Saya Moriyama / Ryutaro Kotaki / Hitomi Kinoshita / Souichi Yamada / Masaharu Shinkai / Shuetsu Fukushi / Yoshimasa Takahashi / Tadaki Suzuki

    iScience, Vol 26, Iss 2, Pp 105969- (2023)

    2023  

    Abstract: Summary: The immune responses to SARS-CoV-2 variants in COVID-19 cases are influenced by various factors including pre-existing immunity via vaccination and prior infection. Elucidating the drivers for upgrading neutralizing activity to SARS-CoV-2 in ... ...

    Abstract Summary: The immune responses to SARS-CoV-2 variants in COVID-19 cases are influenced by various factors including pre-existing immunity via vaccination and prior infection. Elucidating the drivers for upgrading neutralizing activity to SARS-CoV-2 in COVID-19 cases with pre-existing immunity will aid in improving COVID-19 booster vaccines with enhanced cross-protection against antigenically distinct variants, including the Omicron sub-lineage BA.4/5. This study revealed that the magnitude and breadth of neutralization activity to SARS-CoV-2 variants after breakthrough infections are determined primarily by upper respiratory viral load and vaccination-infection time interval. Extensive neutralizing breadth, covering even the most antigenically distant BA.4/5, was observed in cases with higher viral load and longer time intervals. Antigenic cartography depicted a critical role of the time interval in expanding the breadth of neutralization to SARS-CoV-2 variants. Our results illustrate the importance of dosing interval optimization as well as antigen design in developing variant-proof booster vaccines.
    Keywords Immunology ; Immune response ; Virology ; Science ; Q
    Subject code 570
    Language English
    Publishing date 2023-02-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  6. Article ; Online: Significant role of host sialylated glycans in the infection and spread of severe acute respiratory syndrome coronavirus 2.

    Wakana Saso / Masako Yamasaki / Shin-Ichi Nakakita / Shuetsu Fukushi / Kana Tsuchimoto / Noriyuki Watanabe / Nongluk Sriwilaijaroen / Osamu Kanie / Masamichi Muramatsu / Yoshimasa Takahashi / Tetsuro Matano / Makoto Takeda / Yasuo Suzuki / Koichi Watashi

    PLoS Pathogens, Vol 18, Iss 6, p e

    2022  Volume 1010590

    Abstract: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been transmitted across all over the world, in contrast to the limited epidemic of genetically- and virologically-related SARS-CoV. However, the molecular basis explaining the difference in ...

    Abstract Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been transmitted across all over the world, in contrast to the limited epidemic of genetically- and virologically-related SARS-CoV. However, the molecular basis explaining the difference in the virological characteristics among SARS-CoV-2 and SARS-CoV has been poorly defined. Here we identified that host sialoglycans play a significant role in the efficient spread of SARS-CoV-2 infection, while this was not the case with SARS-CoV. SARS-CoV-2 infection was significantly inhibited by α2-6-linked sialic acid-containing compounds, but not by α2-3 analog, in VeroE6/TMPRSS2 cells. The α2-6-linked compound bound to SARS-CoV-2 spike S1 subunit to competitively inhibit SARS-CoV-2 attachment to cells. Enzymatic removal of cell surface sialic acids impaired the interaction between SARS-CoV-2 spike and angiotensin-converting enzyme 2 (ACE2), and suppressed the efficient spread of SARS-CoV-2 infection over time, in contrast to its least effect on SARS-CoV spread. Our study provides a novel molecular basis of SARS-CoV-2 infection which illustrates the distinctive characteristics from SARS-CoV.
    Keywords Immunologic diseases. Allergy ; RC581-607 ; Biology (General) ; QH301-705.5
    Subject code 572
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  7. Article ; Online: Significant role of host sialylated glycans in the infection and spread of severe acute respiratory syndrome coronavirus 2

    Wakana Saso / Masako Yamasaki / Shin-ichi Nakakita / Shuetsu Fukushi / Kana Tsuchimoto / Noriyuki Watanabe / Nongluk Sriwilaijaroen / Osamu Kanie / Masamichi Muramatsu / Yoshimasa Takahashi / Tetsuro Matano / Makoto Takeda / Yasuo Suzuki / Koichi Watashi

    PLoS Pathogens, Vol 18, Iss

    2022  Volume 6

    Abstract: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been transmitted across all over the world, in contrast to the limited epidemic of genetically- and virologically-related SARS-CoV. However, the molecular basis explaining the difference in ...

    Abstract Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been transmitted across all over the world, in contrast to the limited epidemic of genetically- and virologically-related SARS-CoV. However, the molecular basis explaining the difference in the virological characteristics among SARS-CoV-2 and SARS-CoV has been poorly defined. Here we identified that host sialoglycans play a significant role in the efficient spread of SARS-CoV-2 infection, while this was not the case with SARS-CoV. SARS-CoV-2 infection was significantly inhibited by α2-6-linked sialic acid-containing compounds, but not by α2–3 analog, in VeroE6/TMPRSS2 cells. The α2-6-linked compound bound to SARS-CoV-2 spike S1 subunit to competitively inhibit SARS-CoV-2 attachment to cells. Enzymatic removal of cell surface sialic acids impaired the interaction between SARS-CoV-2 spike and angiotensin-converting enzyme 2 (ACE2), and suppressed the efficient spread of SARS-CoV-2 infection over time, in contrast to its least effect on SARS-CoV spread. Our study provides a novel molecular basis of SARS-CoV-2 infection which illustrates the distinctive characteristics from SARS-CoV. Author summary SARS-CoV-2, which has been highly transmissible and rapidly spreading worldwide, has caused approximately 458 million confirmed cases of COVID-19 with more than 6 million deaths by March 2022. Here we found that SARS-CoV-2 infection was significantly inhibited by α2-6-linked sialic acid-containing compounds and by depletion of cell surface sialic acid with only a minor effect on SARS-CoV infection. We identified that SARS-CoV-2 spike S1 subunit directly binds to α2-6-linked sialoglycans for efficient attachment to host cell surface. Our finding indicated that host sialoglycans play a significant role in the efficient infection of SARS-CoV-2, which provides a novel understanding of the molecular basis explaining the rapid spread of SARS-CoV-2 over SARS-CoV.
    Keywords Immunologic diseases. Allergy ; RC581-607 ; Biology (General) ; QH301-705.5
    Subject code 572
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  8. Article ; Online: Favipiravir treatment prolongs the survival in a lethal mouse model intracerebrally inoculated with Jamestown Canyon virus.

    Hirofumi Kato / Mutsuyo Takayama-Ito / Masaaki Satoh / Madoka Kawahara / Satoshi Kitaura / Tomoki Yoshikawa / Shuetsu Fukushi / Nozomi Nakajima / Takashi Komeno / Yousuke Furuta / Masayuki Saijo

    PLoS Neglected Tropical Diseases, Vol 15, Iss 7, p e

    2021  Volume 0009553

    Abstract: Background Jamestown Canyon virus (JCV) is a mosquito-borne orthobunyavirus that causes acute febrile illness, meningitis, and meningoencephalitis, primarily in North American adults. Currently, there are no available vaccines or specific treatments ... ...

    Abstract Background Jamestown Canyon virus (JCV) is a mosquito-borne orthobunyavirus that causes acute febrile illness, meningitis, and meningoencephalitis, primarily in North American adults. Currently, there are no available vaccines or specific treatments against JCV infections. Methodology/principal findings The antiviral efficacy of favipiravir (FPV) against JCV infection was evaluated in vitro and in vivo in comparison with that of ribavirin (RBV) and 2'-fluoro-2'-deoxycytidine (2'-FdC). The in vitro inhibitory effect of these drugs on JCV replication was evaluated in Vero and Neuro-2a (N2A) cells. The efficacy of FPV in the treatment of JCV infection in vivo was evaluated in C57BL/6J mice inoculated intracerebrally with JCV, as per the survival, viral titers in the brain, and viral RNA load in the blood. The 90% inhibitory concentrations (IC90) of FPV, RBV, and 2'-FdC were 41.0, 61.8, and 13.6 μM in Vero cells and 20.7, 25.8, and 8.8 μM in N2A cells, respectively. All mice infected with 1.0×104 TCID50 died or were sacrificed within 10 days post-infection (dpi) without treatment. However, mice treated with FPV for 5 days [initiated either 2 days prior to infection (-2 dpi-2 dpi) or on the day of infection (0 dpi-4 dpi)] survived significantly longer than control mice, administered with PBS (p = 0.025 and 0.011, respectively). Moreover, at 1 and 3 dpi, the virus titers in the brain were significantly lower in FPV-treated mice (0 dpi-4 dpi) versus PBS-treated mice (p = 0.002 for both 1 and 3 dpi). Conclusions/significance Although the intracerebral inoculation route is thought to be a challenging way to evaluate drug efficacy, FPV inhibits the in vitro replication of JCV and prolongs the survival of mice intracerebrally inoculated with JCV. These results will enable the development of a specific antiviral treatment against JCV infections and establishment of an effective animal model.
    Keywords Arctic medicine. Tropical medicine ; RC955-962 ; Public aspects of medicine ; RA1-1270
    Subject code 570 ; 630
    Language English
    Publishing date 2021-07-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  9. Article ; Online: Structural delineation and computational design of SARS-CoV-2-neutralizing antibodies against Omicron subvariants

    Saya Moriyama / Yuki Anraku / Shunta Taminishi / Yu Adachi / Daisuke Kuroda / Shunsuke Kita / Yusuke Higuchi / Yuhei Kirita / Ryutaro Kotaki / Keisuke Tonouchi / Kohei Yumoto / Tateki Suzuki / Taiyou Someya / Hideo Fukuhara / Yudai Kuroda / Tsukasa Yamamoto / Taishi Onodera / Shuetsu Fukushi / Ken Maeda /
    Fukumi Nakamura-Uchiyama / Takao Hashiguchi / Atsushi Hoshino / Katsumi Maenaka / Yoshimasa Takahashi

    Nature Communications, Vol 14, Iss 1, Pp 1-

    2023  Volume 17

    Abstract: Abstract SARS-CoV-2 Omicron subvariants have evolved to evade receptor-binding site (RBS) antibodies that exist in diverse individuals as public antibody clones. We rationally selected RBS antibodies resilient to mutations in emerging Omicron subvariants. ...

    Abstract Abstract SARS-CoV-2 Omicron subvariants have evolved to evade receptor-binding site (RBS) antibodies that exist in diverse individuals as public antibody clones. We rationally selected RBS antibodies resilient to mutations in emerging Omicron subvariants. Y489 was identified as a site of virus vulnerability and a common footprint of broadly neutralizing antibodies against the subvariants. Multiple Y489-binding antibodies were encoded by public clonotypes and additionally recognized F486, potentially accounting for the emergence of Omicron subvariants harboring the F486V mutation. However, a subclass of antibodies broadly neutralized BA.4/BA.5 variants via hydrophobic binding sites of rare clonotypes along with high mutation-resilience under escape mutation screening. A computationally designed antibody based on one of the Y489-binding antibodies, NIV-10/FD03, was able to bind XBB with any 486 mutation and neutralized XBB.1.5. The structural basis for the mutation-resilience of this Y489-binding antibody group may provide important insights into the design of therapeutics resistant to viral escape.
    Keywords Science ; Q
    Language English
    Publishing date 2023-07-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  10. Article: A neutralization assay with a severe fever with thrombocytopenia syndrome virus strain that makes plaques in inoculated cells

    Taniguchi, Satoshi / Aiko Fukuma / Hideki Tani / Shuetsu Fukushi / Masayuki Saijo / Masayuki Shimojima

    Journal of virological methods. 2017 June, v. 244

    2017  

    Abstract: Severe fever with thrombocytopenia syndrome (SFTS) is a recently-discovered, potentially fatal infectious disease caused by SFTS virus (SFTSV). Due to the inability of SFTSV to make clear cytopathic effects (CPE) in cell culture, titration and ... ...

    Abstract Severe fever with thrombocytopenia syndrome (SFTS) is a recently-discovered, potentially fatal infectious disease caused by SFTS virus (SFTSV). Due to the inability of SFTSV to make clear cytopathic effects (CPE) in cell culture, titration and neutralization assays of the virus require immunostaining of inoculated cells; consequently, the assays are time-consuming and expensive. In this report, we demonstrate the use of a highly-passaged SFTSV strain, p50-2, in a neutralization assay, which made clear plaques in inoculated Vero cells under neutral red staining. Furthermore, we performed molecular analyses to determine the characteristics of the strain. The results suggested that a single amino acid mutation within the viral glycoprotein conferred the ability to make clear plaques to SFTSV.
    Keywords SFTS virus ; amino acids ; cell culture ; cytopathogenicity ; fever ; glycoproteins ; infectious diseases ; mutation ; neutralization tests ; staining ; thrombocytopenia ; titration ; viruses
    Language English
    Dates of publication 2017-06
    Size p. 4-10.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 8013-5
    ISSN 1879-0984 ; 0166-0934
    ISSN (online) 1879-0984
    ISSN 0166-0934
    DOI 10.1016/j.jviromet.2017.01.005
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top