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  1. Article: [Novel disease entities due to antiplatelet factor 4 antibodies: HIT, aHIT, and VITT].

    Yasumoto, Atsushi

    Rinsho ketsueki] The Japanese journal of clinical hematology

    2022  Volume 63, Issue 5, Page(s) 454–462

    Abstract: Antiplatelet factor 4 (PF4) antibodies, also known as anti-PF4/heparin complex antibodies, are measured to diagnose heparin-induced thrombocytopenia (HIT). In HIT, anti-PF4 antibodies induced by heparin exposure cause thrombocytopenia and thrombosis. ... ...

    Abstract Antiplatelet factor 4 (PF4) antibodies, also known as anti-PF4/heparin complex antibodies, are measured to diagnose heparin-induced thrombocytopenia (HIT). In HIT, anti-PF4 antibodies induced by heparin exposure cause thrombocytopenia and thrombosis. However, in recent years, autoimmune HIT (aHIT) that develops without heparin exposure has been getting attention. In 2021, anti-PF4 antibodies were reported to cause the fatal vaccine-induced immune thrombotic thrombocytopenia (VITT) that developed after adenoviral vector vaccination for COVID-19. HIT, aHIT, and VITT are considered to be caused by anti-PF4 antibodies, and their pathological conditions are similar. However, they have different levels of severity, and the detection sensitivity of their antibodies varies depending on the assay. Herein, we review three pathologies, namely, HIT, aHIT, and VITT, associated with anti-PF4 antibodies.
    MeSH term(s) Antibodies ; COVID-19 ; Heparin/adverse effects ; Humans ; Platelet Factor 4/immunology ; Purpura, Thrombocytopenic, Idiopathic ; Thrombocytopenia/chemically induced ; Thrombocytopenia/diagnosis ; Thrombosis/etiology ; Vaccines/adverse effects
    Chemical Substances Antibodies ; Vaccines ; Platelet Factor 4 (37270-94-3) ; Heparin (9005-49-6)
    Language Japanese
    Publishing date 2022-05-30
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 390900-1
    ISSN 0485-1439
    ISSN 0485-1439
    DOI 10.11406/rinketsu.63.454
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: [Innovative activated platelet detection technology by artificial intelligence].

    Yasumoto, Atsushi

    Rinsho ketsueki] The Japanese journal of clinical hematology

    2020  Volume 61, Issue 9, Page(s) 1358–1364

    Abstract: Although antiplatelet drugs are widely used for the prevention and treatment of atherothrombosis, clinical tests capable of evaluating their efficacy have not been established. Focusing on platelet aggregates in blood, we announced the world's first ... ...

    Abstract Although antiplatelet drugs are widely used for the prevention and treatment of atherothrombosis, clinical tests capable of evaluating their efficacy have not been established. Focusing on platelet aggregates in blood, we announced the world's first basic technology, an intelligent Image-Activated Cell Sorter (iIACS), that can exhaustively and rapidly identify cells one-by-one using image analysis with high-speed imaging and deep learning to sort specific cells according to the analysis results. This technology has even enabled the detection of single platelets with a size of 2 µm in blood samples and the quantification of the proportion of platelet aggregates by size. Furthermore, by applying this technique, we discovered different morphological features of platelet aggregates formed by different types of agonists that activate platelets. Here, we discuss this application in the early diagnosis of thrombotic microangiopathy (TMA). In the early stage of TMA, consumptive thrombocytopenia is caused by excessive platelet activation. Therefore, the detection of excessive platelet aggregates can lead to early TMA diagnosis.
    MeSH term(s) Artificial Intelligence ; Blood Platelets ; Humans ; Platelet Activation/drug effects ; Platelet Aggregation ; Platelet Aggregation Inhibitors/therapeutic use ; Platelet Count ; Technology
    Chemical Substances Platelet Aggregation Inhibitors
    Language Japanese
    Publishing date 2020-10-14
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 390900-1
    ISSN 0485-1439
    ISSN 0485-1439
    DOI 10.11406/rinketsu.61.1358
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Time of Day of Vaccination Does Not Associate With SARS-CoV-2 Antibody Titer Following First Dose of mRNA COVID-19 Vaccine.

    Yamanaka, Yujiro / Yokota, Isao / Yasumoto, Atsushi / Morishita, Eriko / Horiuchi, Hisanori

    Journal of biological rhythms

    2022  Volume 37, Issue 6, Page(s) 700–706

    Abstract: The immune system exhibits circadian rhythms, and its response to viral infection is influenced by the circadian clock system. Previous studies have reported associations between the time of day of vaccination against COVID-19 and production of anti-SARS- ...

    Abstract The immune system exhibits circadian rhythms, and its response to viral infection is influenced by the circadian clock system. Previous studies have reported associations between the time of day of vaccination against COVID-19 and production of anti-SARS-CoV-2 antibody titer. We examined the effect of vaccination time of day on anti-SARS-CoV-2 antibody titer after the first dose of vaccination with the mRNA-1273 (Moderna) COVID-19 vaccine in an adult population. A total of 332 Japanese adults participated in the present study. All participants were not infected with SARS-CoV-2 and had already received the first dose of mRNA-1273 2 to 4 weeks prior to participating in the study. The participants were asked to provide basic demographic characteristics (age, sex, medical history, allergy, medication, and mean sleep duration), the number of days after the first dose of vaccination, and the time of day of vaccination. Blood was collected from the participants, and SARS-CoV-2 antibody titers were measured. Ordinary least square regression was used for assessing the relationship between basic demographic characteristics, number of days after vaccination, time of day of vaccination, and the log
    MeSH term(s) Adult ; Humans ; COVID-19 Vaccines ; RNA, Messenger ; COVID-19/prevention & control ; SARS-CoV-2 ; Circadian Rhythm ; Vaccination ; 2019-nCoV Vaccine mRNA-1273
    Chemical Substances COVID-19 Vaccines ; RNA, Messenger ; 2019-nCoV Vaccine mRNA-1273 (EPK39PL4R4)
    Language English
    Publishing date 2022-09-26
    Publishing country United States
    Document type Letter
    ZDB-ID 896387-3
    ISSN 1552-4531 ; 0748-7304
    ISSN (online) 1552-4531
    ISSN 0748-7304
    DOI 10.1177/07487304221124661
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: [Thrombosis with Thrombocytopenia Syndrome after ChAdOx1 nCoV-19 vaccination].

    Takatsuki, Mari / Araki, Toshihiko / Kanno, Akira / Yasumoto, Atsushi / Morishita, Eriko / Shiota, Hiroshi

    Rinsho shinkeigaku = Clinical neurology

    2022  Volume 62, Issue 6, Page(s) 487–491

    Abstract: A 48-year-old Japanese man who had no previous medical history received his first dose of the ChAdOx1 nCoV-19 vaccine. Ten days after the vaccine administration, he developed a headache. Laboratory results indicated throm-bocytopenia and DIC. A head CT ... ...

    Abstract A 48-year-old Japanese man who had no previous medical history received his first dose of the ChAdOx1 nCoV-19 vaccine. Ten days after the vaccine administration, he developed a headache. Laboratory results indicated throm-bocytopenia and DIC. A head CT revealed microbleeding in the left parietal lobe. Contrast-enhanced CT showed thrombus in the left transverse sinus and left sigmoid sinus. A brain MRI demonstrated venous hemorrhagic infarction and subarachnoid hemorrhages in the left parietal lobe, and whole-body enhanced CT also revealed portal vein embolism and renal infarction. He was diagnosed with thrombosis with thrombocytopenia syndrome, and was treated according to the guideline. He has been recovering with the treatments. This is the first reported case of TTS associated with the ChAdOx1 nCoV-19 vaccine in Japan.
    MeSH term(s) ChAdOx1 nCoV-19 ; Humans ; Infarction ; Male ; Middle Aged ; Syndrome ; Thrombocytopenia/etiology ; Thrombosis ; Vaccination/adverse effects
    Chemical Substances ChAdOx1 nCoV-19 (B5S3K2V0G8)
    Language Japanese
    Publishing date 2022-05-28
    Publishing country Japan
    Document type Case Reports ; Journal Article
    ZDB-ID 604200-4
    ISSN 1882-0654 ; 0009-918X
    ISSN (online) 1882-0654
    ISSN 0009-918X
    DOI 10.5692/clinicalneurol.cn-001741
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: COVID-19 and Thrombosis: Clinical Aspects.

    Urano, Tetsumei / Yasumoto, Atsushi / Yokoyama, Kenji / Horiuchi, Hisanori / Morishita, Eriko / Suzuki, Yuko

    Current drug targets

    2022  Volume 23, Issue 17, Page(s) 1567–1572

    Abstract: In coronavirus disease 2019 (COVID-19), thrombus formation is related to the pathogenesis of acute respiratory distress syndrome (ARDS) and the progression of clinical symptoms. Severe damage to vascular endothelial cells and the associated cytokine ... ...

    Abstract In coronavirus disease 2019 (COVID-19), thrombus formation is related to the pathogenesis of acute respiratory distress syndrome (ARDS) and the progression of clinical symptoms. Severe damage to vascular endothelial cells and the associated cytokine storm after SARS-CoV-2 infection cause thrombogenesis and contribute to the development of more severe and unique thromboses compared to other infectious diseases. Thromboses occur more often in critically ill patients. In addition to pulmonary thromboembolism (PE) and deep vein thrombosis, acute myocardial infarction, peripheral arterial thrombosis, and aortic thrombosis have also been reported. In PE, thrombi develop in both pulmonary arteries and alveolar capillaries. These, together with intraalveolar fibrin deposition, interfere with effective gaseous exchange in the lungs and exacerbate the clinical symptoms of ARDS in patients with COVID-19. Pharmacological thromboprophylaxis is recommended for all hospitalized patients to prevent both thrombosis and aggravation of ARDS, and other organ failures. Although the pediatric population is mostly asymptomatic or develops mild disease after SARS-CoV-2 infection, a new inflammatory disorder affecting the cardiovascular system, multisystem inflammatory syndrome in children (MIS-C), has been reported. Similar to Kawasaki disease, acute myocarditis, coronary vasculitis, and aneurysms are typically seen in MISC, although these two are now considered distinct entities. A similar acute myocarditis is also observed in young male adults, in which a hyperinflammatory state after SARS-CoV-2 infection seems to be involved. Several side effects following vaccination against COVID-19 have been reported, including vaccine-induced immune thrombotic thrombocytopenia and acute myocarditis. Although these could be serious and life-threatening, the cases are very rare, thus, the benefits of immunization still outweigh the risks.
    MeSH term(s) Child ; Humans ; Male ; COVID-19/complications ; Endothelial Cells ; Anticoagulants ; SARS-CoV-2 ; Venous Thromboembolism
    Chemical Substances Anticoagulants
    Language English
    Publishing date 2022-10-06
    Publishing country United Arab Emirates
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2064859-5
    ISSN 1873-5592 ; 1389-4501
    ISSN (online) 1873-5592
    ISSN 1389-4501
    DOI 10.2174/1389450123666221005092350
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Intelligent Platelet Morphometry

    Zhou, Yuqi / Isozaki, Akihiro / Yasumoto, Atsushi / Xiao, Ting-Hui / Yatomi, Yutaka / Lei, Cheng / Goda, Keisuke

    Trends in biotechnology. 2021,

    2021  

    Abstract: Technological advances in image-based platelet analysis or platelet morphometry are critical for a better understanding of the structure and function of platelets in biological research as well as for the development of better clinical strategies in ... ...

    Abstract Technological advances in image-based platelet analysis or platelet morphometry are critical for a better understanding of the structure and function of platelets in biological research as well as for the development of better clinical strategies in medical practice. Recently, the advent of high-throughput optical imaging and deep learning has boosted platelet morphometry to the next level by providing a new set of capabilities beyond what is achievable with traditional platelet morphometry, shedding light on the unexplored domain of platelet analysis. This Opinion article introduces emerging opportunities in ‘intelligent’ platelet morphometry, which are expected to pave the way for a new class of diagnostics, pharmacometrics, and therapeutics.
    Keywords biotechnology ; diagnostic techniques ; morphometry ; pharmacometrics ; therapeutics
    Language English
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean ; Pre-press version
    ZDB-ID 47474-5
    ISSN 1879-3096 ; 0167-7799
    ISSN (online) 1879-3096
    ISSN 0167-7799
    DOI 10.1016/j.tibtech.2020.12.012
    Database NAL-Catalogue (AGRICOLA)

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  7. Article ; Online: Ultrasonographic monitoring of sinusoidal obstruction syndrome in patients treated with inotuzumab ozogamicin.

    Iwai, Takahito / Nishida, Mutsumi / Sugita, Junichi / Yasumoto, Atsushi / Hasegawa, Yuta / Morimoto, Tomoko / Nakayama, Daishi / Okada, Kohei / Mori, Akio / Teshima, Takanori

    International journal of hematology

    2022  Volume 116, Issue 6, Page(s) 973–975

    MeSH term(s) Humans ; Inotuzumab Ozogamicin ; Hepatic Veno-Occlusive Disease/chemically induced ; Hepatic Veno-Occlusive Disease/diagnostic imaging ; Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy ; Antineoplastic Agents, Immunological/therapeutic use
    Chemical Substances Inotuzumab Ozogamicin (P93RUU11P7) ; Antineoplastic Agents, Immunological
    Language English
    Publishing date 2022-10-29
    Publishing country Japan
    Document type Letter ; Comment
    ZDB-ID 1076875-0
    ISSN 1865-3774 ; 0917-1258 ; 0925-5710
    ISSN (online) 1865-3774
    ISSN 0917-1258 ; 0925-5710
    DOI 10.1007/s12185-022-03477-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Successful treatment with dabigatran for consumptive coagulopathy associated with extensive vascular malformations.

    Yasumoto, Atsushi / Ishiura, Ryohei / Narushima, Mitsunaga / Yatomi, Yutaka

    Blood coagulation & fibrinolysis : an international journal in haemostasis and thrombosis

    2017  Volume 28, Issue 8, Page(s) 670–674

    Abstract: Vascular malformation is occasionally complicated by consumptive coagulopathy, known as localized intravascular coagulopathy (LIC), which is characterized by a reduced fibrinogen level, an elevated D-dimer level and a normal platelet count. We report ... ...

    Abstract : Vascular malformation is occasionally complicated by consumptive coagulopathy, known as localized intravascular coagulopathy (LIC), which is characterized by a reduced fibrinogen level, an elevated D-dimer level and a normal platelet count. We report the case of a 17-year-old Japanese girl who presented with LIC secondary to extensive vascular malformations, whose condition had progressed to disseminated intravascular coagulation (DIC). She suddenly presented with severe anaemia, despite the absence of obvious bleeding, and she began to require regular red blood cell (RBC) transfusions. As she was suffering from paroxysmal atrial fibrillation, we treated her with dabigatran, after obtaining informed consent. Immediately after the administration of dabigatran, the results of clotting tests improved dramatically. Seven months later, she has not required any RBC transfusions, and the dabigatran treatment has been well tolerated. The present case report suggests that dabigatran may be a useful treatment option for patients with DIC associated with vascular malformations.
    MeSH term(s) Adolescent ; Anemia/therapy ; Antithrombins/therapeutic use ; Atrial Fibrillation/drug therapy ; Dabigatran/therapeutic use ; Disseminated Intravascular Coagulation/drug therapy ; Disseminated Intravascular Coagulation/etiology ; Erythrocyte Transfusion ; Female ; Humans ; Treatment Outcome ; Vascular Malformations/complications
    Chemical Substances Antithrombins ; Dabigatran (I0VM4M70GC)
    Language English
    Publishing date 2017-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 1033551-1
    ISSN 1473-5733 ; 0957-5235
    ISSN (online) 1473-5733
    ISSN 0957-5235
    DOI 10.1097/MBC.0000000000000666
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Limitations of deuterium-labeled internal standards for quantitative electrospray ionization mass spectrometry analysis of fatty acid metabolites.

    Tokuoka, Suzumi M / Yasumoto, Atsushi / Kita, Yoshihiro / Shimizu, Takao / Yatomi, Yutaka / Oda, Yoshiya

    Rapid communications in mass spectrometry : RCM

    2020  Volume 34, Issue 13, Page(s) e8814

    Abstract: Rationale: The electrospray ionization mass spectrometry (ESI-MS) methodology often shows poor ionization reproducibility in the analysis of biological samples. Therefore, normalization of the measured peak intensities is essential. It is believed that ... ...

    Abstract Rationale: The electrospray ionization mass spectrometry (ESI-MS) methodology often shows poor ionization reproducibility in the analysis of biological samples. Therefore, normalization of the measured peak intensities is essential. It is believed that quantitative data with high reproducibility can be obtained by adding a constant amount of an internal standard (IS) material labeled with stable isotopes to each sample, thus allowing the correction of the quantitative value of the target compound by that of the IS. We investigated whether the presence or absence of a labeled IS improves the accuracy of these quantitative values.
    Methods: Triple quadrupole MS coupled with liquid chromatography was used to analyze fatty acid metabolites in biological samples as target compounds. Two independent systems were used to provide a measure of reproducibility in two different laboratories.
    Results: Data having poor reproducibility in the raw peak areas were efficiently normalized using the IS, but, crucially, the IS method using stable isotopes was not always necessary. In some cases, the reproducibility was relatively good even without using the IS. In a contaminant matrix, the MS response behavior of the target compound and its stable isotope-labeled material was complicated. Since ion suppression by matrix contaminants was dependent on the concentration of the target compound, the added amounts of the ISs were also important, Furthermore, an equivalent normalization effect was obtained by using a pooled quality control sample as an external standard, thus obviating the need for labeled IS samples, which are often expensive and sometimes not commercially available.
    Conclusions: Our results raise the question as to whether the quantitative method using stable-isotope-labeled ISs is always necessary and beneficial. However, the results obtained in this study cannot be generalized because only fatty acid metabolites were examined using ESI-MS and only a highly substituted deuterium-labeled IS was used.
    MeSH term(s) Animals ; Deuterium/analysis ; Deuterium/chemistry ; Fatty Acids/analysis ; Fatty Acids/chemistry ; Fatty Acids/metabolism ; Haplorhini ; Humans ; Isotope Labeling/methods ; Reference Standards ; Reproducibility of Results ; Spectrometry, Mass, Electrospray Ionization/methods
    Chemical Substances Fatty Acids ; Deuterium (AR09D82C7G)
    Language English
    Publishing date 2020-05-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.8814
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Incidence and course of Epstein-Barr virus viremia after allogeneic hematopoietic stem cell transplant for adult-onset systemic chronic active Epstein-Barr virus disease.

    Vaswani, Preeti Prerna M / Onozawa, Masahiro / Hasegawa, Yuta / Ohigashi, Hiroyuki / Ara, Takahide / Matsukawa, Toshihiro / Yasumoto, Atsushi / Shiratori, Souichi / Goto, Hideki / Nakagawa, Masao / Kahata, Kaoru / Endo, Tomoyuki / Hashimoto, Daigo / Teshima, Takanori

    Bone marrow transplantation

    2023  Volume 58, Issue 12, Page(s) 1397–1399

    MeSH term(s) Adult ; Humans ; Epstein-Barr Virus Infections ; Herpesvirus 4, Human ; Viremia/etiology ; Incidence ; Hematopoietic Stem Cell Transplantation/adverse effects ; Lymphoproliferative Disorders/complications
    Language English
    Publishing date 2023-09-05
    Publishing country England
    Document type Letter
    ZDB-ID 632854-4
    ISSN 1476-5365 ; 0268-3369 ; 0951-3078
    ISSN (online) 1476-5365
    ISSN 0268-3369 ; 0951-3078
    DOI 10.1038/s41409-023-02103-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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