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  1. Article ; Online: Evaluation of the correlation between the access SARS-CoV-2 IgM and IgG II antibody tests with the SARS-CoV-2 surrogate virus neutralization test.

    Kitagawa, Yutaro / Imai, Kazuo / Matsuoka, Masaru / Fukada, Ai / Kubota, Katsumi / Sato, Momoko / Takada, Tomohito / Noguchi, Sakiko / Tarumoto, Norihito / Maesaki, Shigefumi / Takeuchi, Shinichi / Maeda, Takuya

    Journal of medical virology

    2021  Volume 94, Issue 1, Page(s) 335–341

    Abstract: Fully automated immunoassays for detecting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies that are strongly correlated with neutralization antibodies (nAbs) are clinically important because they enable the assessment of humoral ... ...

    Abstract Fully automated immunoassays for detecting severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies that are strongly correlated with neutralization antibodies (nAbs) are clinically important because they enable the assessment of humoral immunity after infection and vaccination. Access SARS-CoV-2 immunoglobulin M (IgM) and immunoglobulin G (IgG) II antibody tests are semi-quantitative, fully automated immunoassays that detect anti-receptor-binding domain (RBD) antibodies and might reflect nAb levels in coronavirus disease 2019 (COVID-19). However, no studies have investigated the clinical utility of these tests in association with nAbs to date. To evaluate the clinical utility of Access SARS-CoV-2 IgM and IgG II antibody tests and their correlation with the SARS-CoV-2 surrogate virus neutralization test (sVNT) that measures nAbs in patients with COVID-19, we analyzed 54 convalescent serum samples from COVID-19 patients and 89 serum samples from non-COVID-19 patients. The presence of anti-RBD antibodies was detected using Access SARS-CoV-2 IgM and IgG II antibody tests, while nAbs were measured by sVNT. The sensitivity and specificity of sVNT were 94.4% and 98.9%, respectively. There were strong positive correlations between the inhibition values of sVNT and the results of the Access SARS-CoV-2 IgM (R = 0.95, R
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Antibodies, Neutralizing/blood ; Antibodies, Viral/blood ; COVID-19/diagnosis ; Female ; Humans ; Immunoassay/methods ; Immunoglobulin G/blood ; Immunoglobulin M/blood ; Male ; Middle Aged ; Neutralization Tests/methods ; SARS-CoV-2/immunology ; Sensitivity and Specificity
    Chemical Substances Antibodies, Neutralizing ; Antibodies, Viral ; Immunoglobulin G ; Immunoglobulin M
    Language English
    Publishing date 2021-10-05
    Publishing country United States
    Document type Evaluation Study ; Journal Article
    ZDB-ID 752392-0
    ISSN 1096-9071 ; 0146-6615
    ISSN (online) 1096-9071
    ISSN 0146-6615
    DOI 10.1002/jmv.27338
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Cross-reactive humoral immune responses against seasonal human coronaviruses in COVID-19 patients with different disease severities.

    Imai, Kazuo / Matsuoka, Masaru / Tabata, Sakiko / Kitagawa, Yutaro / Nagura-Ikeda, Mayu / Kubota, Katsumi / Fukada, Ai / Takada, Tomohito / Sato, Momoko / Noguchi, Sakiko / Takeuchi, Shinichi / Arakawa, Noriaki / Miyoshi, Kazuyasu / Saito, Yoshiro / Maeda, Takuya

    International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases

    2021  Volume 111, Page(s) 68–75

    Abstract: Background: The cross-reactive antibody response against seasonal human coronaviruses (HCoVs) was evaluated according to disease severity in patients with COVID-19 in Japan.: Methods: In total, 194 paired serum samples collected from 97 patients with ...

    Abstract Background: The cross-reactive antibody response against seasonal human coronaviruses (HCoVs) was evaluated according to disease severity in patients with COVID-19 in Japan.
    Methods: In total, 194 paired serum samples collected from 97 patients with COVID-19 (mild, 35; severe, 62) were analyzed on admission and during convalescence. IgG antibodies against the nucleocapsid (N) and spike (S) proteins of SARS-CoV-2 and four seasonal HCoVs (HCoV-NL63, -229E, -OC43, and -HKU1) were detected by enzyme-linked immunosorbent assays.
    Results: There was no difference in optical density (OD) values for seasonal HCoVs on admission between the severe and mild cases. In addition, a specific pattern of disease severity-associated OD values for HCoVs was not identified. Significant increases in OD values from admission to convalescence for HCoV-HKU1and -OC43 IgG-S, and for HCoV-NL63 and -229E IgG-N were observed in the severe cases. Significant differences were observed between the mild and severe cases for HCoV-HKU1 and -OC43 IgG-S OD values during convalescence. Correlations were found between the fold changes for HCoV-OC43 IgG-S OD values, and for SARS-CoV-2 IgG-S OD values, and C-reactive protein, lactate dehydrogenase, and lymphocyte levels.
    Conclusion: There was no association between the antibody titer for seasonal HCoVs in the early phase of COVID-19 and disease severity.
    MeSH term(s) COVID-19 ; Humans ; Immunity, Humoral ; SARS-CoV-2 ; Seasons ; Severity of Illness Index ; Spike Glycoprotein, Coronavirus
    Chemical Substances Spike Glycoprotein, Coronavirus
    Language English
    Publishing date 2021-08-15
    Publishing country Canada
    Document type Journal Article
    ZDB-ID 1331197-9
    ISSN 1878-3511 ; 1201-9712
    ISSN (online) 1878-3511
    ISSN 1201-9712
    DOI 10.1016/j.ijid.2021.08.026
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Clinical characteristics and antibody response to SARS-CoV-2 spike 1 protein using VITROS Anti-SARS-CoV-2 antibody tests in COVID-19 patients in Japan.

    Nagura-Ikeda, Mayu / Imai, Kazuo / Kubota, Katsumi / Noguchi, Sakiko / Kitagawa, Yutaro / Matsuoka, Masaru / Tabata, Sakiko / Miyoshi, Kazuyasu / Ito, Toshimitsu / Tamura, Kaku / Maeda, Takuya

    Journal of medical microbiology

    2021  Volume 70, Issue 4

    Abstract: Introduction. ...

    Abstract Introduction.
    MeSH term(s) Adolescent ; Adult ; Aged ; Aged, 80 and over ; Antibodies, Viral/blood ; Antibodies, Viral/immunology ; COVID-19/blood ; COVID-19/diagnosis ; COVID-19 Serological Testing/methods ; Diagnostic Tests, Routine ; Female ; Hospitalization ; Humans ; Immunoglobulin G/blood ; Immunoglobulin G/immunology ; Japan ; Kinetics ; Male ; Middle Aged ; Prognosis ; SARS-CoV-2/immunology ; SARS-CoV-2/isolation & purification ; Spike Glycoprotein, Coronavirus/immunology ; Young Adult
    Chemical Substances Antibodies, Viral ; Immunoglobulin G ; Spike Glycoprotein, Coronavirus ; spike protein, SARS-CoV-2
    Language English
    Publishing date 2021-04-16
    Publishing country England
    Document type Evaluation Study ; Journal Article
    ZDB-ID 218356-0
    ISSN 1473-5644 ; 0022-2615
    ISSN (online) 1473-5644
    ISSN 0022-2615
    DOI 10.1099/jmm.0.001291
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Clinical evaluation of the antibody response in patients with COVID-19 using automated high-throughput immunoassays.

    Kubota, Katsumi / Kitagawa, Yutaro / Matsuoka, Masaru / Imai, Kazuo / Orihara, Yuta / Kawamura, Rieko / Sakai, Jun / Ishibashi, Noriomi / Tarumoto, Norihito / Takeuchi, Shinichi / Maesaki, Shigefumi / Maeda, Takuya

    Diagnostic microbiology and infectious disease

    2021  Volume 100, Issue 3, Page(s) 115370

    Abstract: Several automated high-throughput immunoassays for detecting anti-SARS-CoV-2 antibodies by a semi-quantitative approach have been commercialized. In this study, we describe the timeline of the antibody response in patients with RT-PCR-confirmed COVID-19. ...

    Abstract Several automated high-throughput immunoassays for detecting anti-SARS-CoV-2 antibodies by a semi-quantitative approach have been commercialized. In this study, we describe the timeline of the antibody response in patients with RT-PCR-confirmed COVID-19. A total of 292 sequential serum samples from 33 Japanese patients were retrospectively analyzed using four test kits for SARS-CoV-2: the Abbott SARS-CoV-2 IgG assay (Abbott), Elecsys® Anti-SARS-CoV-2 assay (Roche Diagnostic), and VITROS® Anti-SARS-CoV-2 Total and IgG assays (Ortho Clinical Diagnostics). All automated immunoassays could equivalently identify positive sera collected within 2 weeks after symptom onset (99.3%-100%). In addition, the S protein-based automated immunoassay, the VITROS® Anti-SARS-CoV-2 Total assay, may play a complementary role in evaluating passive antibody therapies or vaccines against SARS-CoV-2, although further research is required.
    MeSH term(s) Adult ; Aged ; Antibodies, Viral/blood ; COVID-19/diagnosis ; COVID-19/immunology ; COVID-19 Serological Testing/methods ; Female ; High-Throughput Screening Assays ; Humans ; Immunoassay ; Kinetics ; Male ; Middle Aged ; Retrospective Studies ; SARS-CoV-2/immunology ; SARS-CoV-2/isolation & purification ; Sensitivity and Specificity
    Chemical Substances Antibodies, Viral
    Language English
    Publishing date 2021-03-13
    Publishing country United States
    Document type Comparative Study ; Evaluation Study ; Journal Article
    ZDB-ID 604920-5
    ISSN 1879-0070 ; 0732-8893
    ISSN (online) 1879-0070
    ISSN 0732-8893
    DOI 10.1016/j.diagmicrobio.2021.115370
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Antibody response patterns in COVID-19 patients with different levels of disease severity in Japan.

    Imai, Kazuo / Kitagawa, Yutaro / Tabata, Sakiko / Kubota, Katsumi / Nagura-Ikeda, Mayu / Matsuoka, Masaru / Miyoshi, Kazuyasu / Sakai, Jun / Ishibashi, Noriomi / Tarumoto, Norihito / Takeuchi, Shinichi / Ito, Toshimitsu / Maesaki, Shigefumi / Tamura, Kaku / Maeda, Takuya

    Journal of medical virology

    2021  Volume 93, Issue 5, Page(s) 3211–3218

    Abstract: We analyzed antibody response patterns according to the level of disease severity in patients with novel coronavirus disease 2019 (COVID-19) in Japan. We analyzed 611 serum specimens from 231 patients with COVID-19 (mild, 170; severe, 31; critical, 30). ... ...

    Abstract We analyzed antibody response patterns according to the level of disease severity in patients with novel coronavirus disease 2019 (COVID-19) in Japan. We analyzed 611 serum specimens from 231 patients with COVID-19 (mild, 170; severe, 31; critical, 30). Immunoglobulin M (IgM) and IgG antibodies against nucleocapsid protein (N) and spike 1 protein (S1) were detected by enzyme-linked immunosorbent assays. The peaks of fitting curves for the optical density (OD) values of IgM and IgG antibodies against N appeared simultaneously, while those against S1 were delayed compared with N. The OD values of IgM against N and IgG against both N and S1 were significantly higher in the severe and critical cases than in the mild cases at 11 days after symptom onset. The seroconversion rates of IgG were higher than those of IgM against both N and S1 during the clinical course based on the optimal cut-off values defined in this study. The seroconversion rates of IgG and IgM against N and S1 were higher in the severe and critical cases than in the mild cases. Our findings show that a stronger antibody response occurred in COVID-19 patients with greater disease severity and there were low seroconversion rates of antibodies against N and S1 in the mild cases.
    MeSH term(s) Antibodies, Viral/blood ; Antibodies, Viral/classification ; COVID-19/epidemiology ; COVID-19/immunology ; COVID-19/pathology ; Humans ; Immunoglobulin G/blood ; Immunoglobulin G/classification ; Immunoglobulin M/blood ; Immunoglobulin M/classification ; Japan/epidemiology ; SARS-CoV-2/immunology
    Chemical Substances Antibodies, Viral ; Immunoglobulin G ; Immunoglobulin M
    Language English
    Publishing date 2021-03-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 752392-0
    ISSN 1096-9071 ; 0146-6615
    ISSN (online) 1096-9071
    ISSN 0146-6615
    DOI 10.1002/jmv.26899
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: A highly practical and enantioselective reagent for the allylation of aldehydes.

    Kubota, Katsumi / Leighton, James L

    Angewandte Chemie (International ed. in English)

    2003  Volume 42, Issue 8, Page(s) 946–948

    Language English
    Publishing date 2003-02-24
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.200390252
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Clinical characteristics and antibody response to SARS-CoV-2 spike 1 protein using the VITROS Anti-SARS-CoV-2 antibody tests in COVID-19 patients in Japan

    Nagura-Ikeda, Mayu / Imai, Kazuo / Kubota, Katsumi / Noguchi, Sakiko / Kitagawa, Yutaro / Matsuoka, Masaru / Tabata, Sakiko / Miyoshi, Kazuyasu / Ito, Toshimitsu / Tamura, Kaku / Maeda, Takuya

    Abstract: Abstract Background: We evaluated clinical characteristics and the clinical utility of VITROS SARS-CoV-2 antibody tests according to COVID-19 severity in patients in Japan. Methods: We analyzed 255 serum specimens from 130 COVID-19 patients and examined ... ...

    Abstract Abstract Background: We evaluated clinical characteristics and the clinical utility of VITROS SARS-CoV-2 antibody tests according to COVID-19 severity in patients in Japan. Methods: We analyzed 255 serum specimens from 130 COVID-19 patients and examined clinical records and laboratory data. Presence of total (IgA, IgM, and IgG) and specific IgG antibody for the spike 1 antigen of SARS-CoV2 was determined using VITROS Anti-SARS-CoV-2 antibody tests. Findings: Overall, 98 (75.4%) and 32 (24.6%) patients had mild and severe COVID-19, respectively. On admission, 76 (58.5%) and 45 (34.6%) patients were positive for total and IgG antibody assays. Among 91 patients at discharge, 90 (98.9%) and 81 (89.0%) patients were positive for total and IgG antibody, respectively. Clinical background and laboratory findings on admission, but not the prevalence or concentration of total or IgG antibody, were associated with disease prognosis. Total and IgG antibody intensity were significantly higher in severe cases than in mild cases in serum collected after 11 days from onset, but not within 10 days. Conclusion: VITROS Anti-SARS-CoV-2 Total and IgG assays will be useful as supporting diagnostic and surveillance tools and for evaluation of humoral immune response to COVID-19. Clinical background and laboratory findings are preferable predictors of disease prognosis.
    Keywords covid19
    Publisher MedRxiv; WHO
    Document type Article ; Online
    Note WHO #Covidence: #20166256
    DOI 10.1101/2020.08.02.20166256
    Database COVID19

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  8. Article ; Online: Clinical characteristics and antibody response to SARS-CoV-2 spike 1 protein using the VITROS Anti-SARS-CoV-2 antibody tests in COVID-19 patients in Japan

    Nagura-Ikeda, Mayu / Imai, Kazuo / Kubota, Katsumi / Noguchi, Sakiko / Kitagawa, Yutaro / Matsuoka, Masaru / Tabata, Sakiko / Miyoshi, Kazuyasu / Ito, Toshimitsu / Tamura, Kaku / Maeda, Takuya

    medRxiv

    Abstract: Abstract Background: We evaluated clinical characteristics and the clinical utility of VITROS SARS-CoV-2 antibody tests according to COVID-19 severity in patients in Japan. Methods: We analyzed 255 serum specimens from 130 COVID-19 patients and examined ... ...

    Abstract Abstract Background: We evaluated clinical characteristics and the clinical utility of VITROS SARS-CoV-2 antibody tests according to COVID-19 severity in patients in Japan. Methods: We analyzed 255 serum specimens from 130 COVID-19 patients and examined clinical records and laboratory data. Presence of total (IgA, IgM, and IgG) and specific IgG antibody for the spike 1 antigen of SARS-CoV2 was determined using VITROS Anti-SARS-CoV-2 antibody tests. Findings: Overall, 98 (75.4%) and 32 (24.6%) patients had mild and severe COVID-19, respectively. On admission, 76 (58.5%) and 45 (34.6%) patients were positive for total and IgG antibody assays. Among 91 patients at discharge, 90 (98.9%) and 81 (89.0%) patients were positive for total and IgG antibody, respectively. Clinical background and laboratory findings on admission, but not the prevalence or concentration of total or IgG antibody, were associated with disease prognosis. Total and IgG antibody intensity were significantly higher in severe cases than in mild cases in serum collected after 11 days from onset, but not within 10 days. Conclusion: VITROS Anti-SARS-CoV-2 Total and IgG assays will be useful as supporting diagnostic and surveillance tools and for evaluation of humoral immune response to COVID-19. Clinical background and laboratory findings are preferable predictors of disease prognosis.
    Keywords covid19
    Language English
    Publishing date 2020-08-04
    Publisher Cold Spring Harbor Laboratory Press
    Document type Article ; Online
    DOI 10.1101/2020.08.02.20166256
    Database COVID19

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  9. Article ; Online: Antibody response patterns in COVID-19 patients with different levels of disease severity-Japan

    Imai, Kazuo / Kitagawa, Yutaro / Tabata, Sakiko / Kubota, Katsumi / Ikeda, Mayu / Matuoka, Masaru / Miyoshi, Kazuyasu / Sakai, Jun / Ishibashi, Noriomi / Tarumoto, Norihito / Takeuchi, Shinichi / Ito, Toshimitsu / Maesaki, Shigefumi / Tamura, Kaku / Maeda, Takuya

    medRxiv

    Abstract: Background: We analyzed antibody response patterns according to level of disease severity in patients with novel coronavirus disease 2019 (COVID-19) in Japan. Methods: We analyzed 611 serum specimens from 231 patients with COVID-19 (mild, 170; severe, 31; ...

    Abstract Background: We analyzed antibody response patterns according to level of disease severity in patients with novel coronavirus disease 2019 (COVID-19) in Japan. Methods: We analyzed 611 serum specimens from 231 patients with COVID-19 (mild, 170; severe, 31; critical, 30). IgM and IgG antibodies against nucleocapsid protein (N) and spike 1 protein (S1) were detected by enzyme-linked immunosorbent assays. Findings: The peaks of fitting curves for the OD values of IgM and IgG antibodies against N appeared simultaneously, while those against S1 were delayed compared with N. The OD values of IgM against N and IgG against both N and S1 were significantly higher in the severe and critical cases than in the mild cases at 11 days after symptom onset. The seroconversion rates of IgG were higher than those of IgM against both N and S1 during the clinical course based on the optimal cut-off values defined in this study. The seroconversion rates of IgG and IgM against N and S1 were higher in the severe and critical cases than in the mild cases. Conclusion: Our findings show that a stronger antibody response occurred in COVID-19 patients with greater disease severity and there were low seroconversion rates of antibodies against N and S1 in the mild cases. The antibody response patterns in our population suggest a second infection pattern, leading us to hypothesize that cross-reactivity occurs between SARS-CoV-2 and past infection with other human coronaviruses.
    Keywords covid19
    Language English
    Publishing date 2020-11-23
    Publisher Cold Spring Harbor Laboratory Press
    Document type Article ; Online
    DOI 10.1101/2020.11.20.20231696
    Database COVID19

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  10. Article: Synthesis and structure–activity relationship of tricyclic carboxylic acids as novel anti-histamines

    Kubota, Katsumi / Kurebayashi, Hirotaka / Miyachi, Hirotaka / Tobe, Masanori / Onishi, Masako / Isobe, Yoshiaki

    Bioorganic & medicinal chemistry. 2011 May 1, v. 19, no. 9

    2011  

    Abstract: A series of tricyclic carboxylic acids having 6-amino-pyrimidine-2,4(1H,3H)-dione with piperazino or homopiperazino moiety linked by propylene, were synthesized and evaluated for their affinity toward human histamine H₁ receptor and Caco-2 cell ... ...

    Abstract A series of tricyclic carboxylic acids having 6-amino-pyrimidine-2,4(1H,3H)-dione with piperazino or homopiperazino moiety linked by propylene, were synthesized and evaluated for their affinity toward human histamine H₁ receptor and Caco-2 cell permeability. Selected compounds were further evaluated for their oral anti-histaminic activity in mice, bioavailability in rats, and their anti-inflammatory activity in mice OVA-induced biphasic cutaneous reaction model. Among the compounds tested, dibenzoxazepine carboxylic acid 13b showed both histamine H₁ receptor antagonistic activity and anti-inflammatory activity in vivo. In addition, 13b exhibited low affinity toward α₁ receptor and low occupancy of H₁ receptor in the brain. It is therefore, believed that 13b is a potential candidate for development as 3rd generation anti-histamine.
    Keywords anti-inflammatory activity ; bioavailability ; brain ; carboxylic acids ; histamine ; human cell lines ; humans ; mice ; models ; permeability ; propylene ; rats ; structure-activity relationships
    Language English
    Dates of publication 2011-0501
    Size p. 3005-3021.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1161284-8
    ISSN 1464-3391 ; 0968-0896
    ISSN (online) 1464-3391
    ISSN 0968-0896
    DOI 10.1016/j.bmc.2011.03.003
    Database NAL-Catalogue (AGRICOLA)

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