東 美菜子 (アズマ ミナコ)

AZUMA Minako

写真a

所属

医学部 医学科 病態解析医学講座放射線医学分野

職名

教授

外部リンク

関連SDGs


 

論文 【 表示 / 非表示

  • Metastatic Cardiac Tumor Mimicking Coronary Artery Aneurysm on Postmortem Computed Tomography. 査読あり

    Shinkawa N, Yamada R, Azuma M, Shinkawa N, Yukawa N

    The American journal of forensic medicine and pathology   2025年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1097/PAF.0000000000001038

    PubMed

  • Factor XI localization in human deep venous thrombus and function of activated factor XI on venous thrombus formation and hemostasis 査読あり

    Oguri N., Gi T., Nakamura E., Maekawa K., Furukoji E., Okawa H., Kouyama S., Horiuchi S., Sawaguchi A., Sakae T., Azuma M., Asada Y., Yamashita A.

    Research and Practice in Thrombosis and Haemostasis   9 ( 2 )   2025年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Research and Practice in Thrombosis and Haemostasis  

    Background: Novel anticoagulants targeting coagulation factor (F)XI/activated FXI (FXIa) are currently under development. However, whether FXI is present in human deep vein thrombosis (DVT) and whether FXIa and activated FX (FXa) play different roles in venous thrombus formation and hemostasis remain unclear. Objectives: To determine the presence of FXI in DVT and the effects of direct oral FXIa and FXa inhibitors on venous thrombus formation and hemostasis in rabbits and on in vitro thrombus formation. Methods: We immunohistochemically assessed FXI localization in human-aspirated DVT (n = 15). Additionally, we compared thrombus formation induced by endothelial denudation and stenosis or stasis in the jugular vein and skin bleeding time and volume between rabbits treated with direct FXIa inhibitors (ONO-1600586) and FXa inhibitors (rivaroxaban). Ex vivo rabbit and human blood were perfused in a flow chamber under low-shear rates (70/s). Results: FXI was localized in all DVT, predominantly in fibrin-rich areas. The FXI immunopositive area in the nonorganizing area was greater than that in the organizing area. Although FXIa and FXa inhibitors comparably inhibited venous thrombus formation, FXIa inhibitors did not affect bleeding time or volume in rabbits. FXIa or FXa inhibitors mildly or strongly inhibited fibrin formation at low-shear rates, respectively. Furthermore, the FXIa inhibitor suppressed human FXIa activity, thrombin generation, and fibrin formation during perfusion. Conclusion: The pathologic findings of human DVT suggest FXI's role in human DVT. FXIa inhibitors may inhibit less fibrin formation than FXa inhibitors and may explain the minor role of FXIa in hemostasis.

    DOI: 10.1016/j.rpth.2025.102720

    Scopus

  • Expression of fibroblast activation protein-α in human deep vein thrombosis 査読あり

    Oguri N., Gi T., Nakamura E., Furukoji E., Goto H., Maekawa K., Tsuji A.B., Nishii R., Aman M., Moriguchi-Goto S., Sakae T., Azuma M., Yamashita A.

    Thrombosis Research   241   109075   2024年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Thrombosis Research  

    Background: Fibroblast activation protein-α (FAP), a type-II transmembrane serine protease, is associated with wound healing, cancer-associated fibroblasts, and chronic fibrosing diseases. However, its expression in deep vein thrombosis (DVT) remains unclear. Therefore, this study investigated FAP expression and localization in DVT. Methods: We performed pathological analyses of the aspirated thrombi of patients with DVT (n = 14), classifying thrombotic areas in terms of fresh, cellular lysis, and organizing reaction components. The organizing reaction included endothelialization and fibroblastic reaction. We immunohistochemically examined FAP-expressed areas and cells, and finally analyzed FAP expression in cultured dermal fibroblasts. Results: All the aspirated thrombi showed a heterogeneous mixture of at least two of the three thrombotic areas. Specifically, 83 % of aspirated thrombi showed fresh and organizing reaction components. Immunohistochemical expression of FAP was restricted to the organizing area. Double immunofluorescence staining showed that FAP in the thrombi was mainly expressed in vimentin-positive or α-smooth muscle actin-positive fibroblasts. Some CD163-positive macrophages expressed FAP. FAP mRNA and protein levels were higher in fibroblasts with low-proliferative activity cultured under 0.1 % fetal bovine serum (FBS) than that under 10 % FBS. Fibroblasts cultured in 10 % FBS showed a significant decrease in FAP mRNA levels following supplementation with hemin, but not with thrombin. Conclusions: The heterogeneous composition of venous thrombi suggests a multistep thrombus formation process in human DVT. Further, fibroblasts or myofibroblasts may express FAP during the organizing process. FAP expression may be higher in fibroblasts with low proliferative activity.

    DOI: 10.1016/j.thromres.2024.109075

    Scopus

    PubMed

  • Elevated plasma levels of factor VIII enhance arterial thrombus formation on erosive smooth muscle cell-rich neointima but not normal intima in rabbits 査読あり

    Sugita C., Maekawa K., Gi T., Oguri N., Nakamura E., Furukoji E., Azuma M., Asada Y., Yamashita A.

    Thrombosis Research   238   185 - 196   2024年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Thrombosis Research  

    Background: Plaque erosion, a type of coronary atherothrombosis, involves superficial injury to smooth muscle cell (SMC)-rich plaques. Elevated levels of coagulation factor VIII (FVIII) correlate with an increased ischemic heart disease risk. FVIII may contribute to thrombus formation on eroded plaques. Aims: We aimed to elucidate the role of elevated FVIII in arterial thrombus formation within SMC-rich neointima in rabbits. Methods and results: We assessed the effect of recombinant human FVIII (rFVIII) on blood coagulation in vitro and platelet aggregation ex vivo. An SMC-rich neointima was induced through balloon injury to the unilateral femoral artery. Three weeks after the first balloon injury, superficial erosive injury and thrombus formation were initiated with a second balloon injury of the bilateral femoral arteries 45 min after the administration of rFVIII (100 IU/kg) or saline. The thrombus area and contents were histologically measured 15 min after the second balloon injury. rFVIII administration reduced the activated partial thromboplastin time and augmented botrocetin-induced, but not collagen- or adenosine 5′-diphosphate-induced, platelet aggregation. While rFVIII did not influence platelet-thrombus formation in normal intima, it increased thrombus formation on SMC-rich neointima post-superficial erosive injury. Enhanced immunopositivity for glycoprotein IIb/IIIa and fibrin was observed in rFVIII-administered SMC-rich neointima. Neutrophil count in the arterial thrombus on the SMC-rich neointima correlated positively with thrombus size in the control group, unlike the rFVIII group. Conclusions: Increased FVIII contributes to thrombus propagation within erosive SMC-rich neointima, highlighting FVIII's potential role in plaque erosion-related atherothrombosis.

    DOI: 10.1016/j.thromres.2024.04.025

    Scopus

    PubMed

  • Usefulness of Dual-Energy CT for Differentiating Hemorrhage from Iodine Extravasation in Meningiomas after Preoperative Embolization 査読あり

    Uchimura R., Khant Z.A., Hayashi H., Nagayama Y., Uetani H., Kaku Y., Nagatomo T., Tamura Y., Yokogami K., Mukasa A., Kiyosue H., Azuma M., Hirai T.

    Journal of Computer Assisted Tomography   2024年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Computer Assisted Tomography  

    Objective Discriminating between hemorrhage and iodine extravasation can pose challenges in conventional computed tomography (CCT) images following preoperative embolization for meningioma. This study aimed to assess the efficacy of dual-energy computed tomography (DECT) in differentiating hemorrhage from iodine extravasation after preoperative embolization for meningioma. Methods Twenty-one consecutive meningioma patients who underwent CCT before and DECT immediately after preoperative embolization were included in this study. Two independent observers conducted qualitative assessments on CCT and virtual noncontrast (VNC) images and iodine maps (IMs) to differentiate between hemorrhage and iodine extravasation. One observer recorded CT values of hemorrhage and iodine extravasation on CCT and VNC images. The ratio of maximum attenuation to minimum attenuation on VNC images was defined as the VNC ratio. Statistical analysis included Kappa (κ) statistics, unpaired t tests, and receiver operating characteristic (ROC) analysis. Results Interobserver agreement for qualitative assessment was fair (κ = 0.231) for CCT alone and good (κ = 0.723) for CCT plus VNC imaging and IM. The addition of VNC imaging and IM to CCT improved differential confidence in 16 (76%) and 18 (86%) cases of the two observers, respectively, increasing the area under the receiver operating characteristic curve (AUROC) from 0.868 to 0.895 and 0.658 to 0.947, respectively. At a cutoff value of 1.527, the VNC ratio was significantly higher for hemorrhage than iodine extravasation (P < 0.05), with the highest diagnostic performance (AUROC, 1). Conclusions DECT with VNC imaging and IM is useful for differentiating hemorrhage from iodine extravasation in meningiomas with preoperative embolization.

    DOI: 10.1097/RCT.0000000000001685

    Scopus

    PubMed

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書籍等出版物 【 表示 / 非表示

  • 宮崎県小児科医会会報

    東 美菜子( 担当: 共著 ,  範囲: 【特別講演Ⅰ】画像診断における最近の話題)

    宮崎県小児科医会  2023年3月 

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    記述言語:日本語

  • 特集 ビギナーのための頭部画像診断 -Q&Aアプローチ- 2023 所見別 小脳橋角部腫瘤はどのように考えればよいですか?

    東 美菜子( 担当: 共著)

    学研メディカル秀潤社  2022年12月 

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    記述言語:日本語 著書種別:学術書

    DOI: 10.15105/gz.0000004328

  • 臨床画像 2022年9月号

    東 美菜子( 担当: 共著 ,  範囲: 特集 1 絶対苦手分野にしない 頭蓋底周辺の画像診断)

    株式会社メジカルビュー社  2022年9月 

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    記述言語:日本語 著書種別:学術書

  • 日州医事 No.877

    東 美菜子( 担当: 共著 ,  範囲: 画像診断とAI)

    宮崎県医師会  2022年9月 

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    記述言語:日本語 著書種別:学術書

  • 月刊インナービジョン2022年9月号

    東 美菜子( 担当: 共著 ,  範囲: Step up MRI 2022 MRI研究の最新動向&領域別MRI技術の臨床応用とトピックス)

    インナービジョン  2022年9月 

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    記述言語:日本語 著書種別:学術書

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講演・口頭発表等 【 表示 / 非表示

  • 腹腔動脈瘤切除術後のバイパス吻合部に形成された仮性動脈瘤に対しcovered-stentを用いて治療を行った1例

    原 卓也、古小路 英二、増田 梨絵、榮 建文、東 美菜子

    第44回九州IVR研究会 

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    開催年月日: 2022年12月17日

    記述言語:日本語   会議種別:口頭発表(一般)  

  • 神経眼科疾患の画像診断

    東 美菜子

    第24回北海道NR懇話会 

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    開催年月日: 2022年12月10日

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  • 脳神経の画像診断

    東 美菜子

    第342回関西NR勉強会学術講演会 

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    開催年月日: 2022年11月19日

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  • 頭蓋底周辺の画像診断

    東 美菜子

    第50回三重総合画像研究会 

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    開催年月日: 2022年11月18日

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  • QSMの臨床的有用性の検討

    東 美菜子

    令和4年度熊本大学放射線科MRI研究会 

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    開催年月日: 2022年11月7日

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

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受賞 【 表示 / 非表示

  • Certificate of Merit

    2021年12月   Radiological Society of North America   Contrast-enhanced 3D T2-FLAIR Imaging Of The Brain: What Should Radiologists Know?

    Minako Azuma, Yoshihito Kadota, Toshinori Hirai

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    受賞区分:国際学会・会議・シンポジウム等の賞 

  • 加藤賞

    2021年2月   日本神経放射線学会   Characterization of Carotid Plaque Components by Quantitative Susceptibility Mapping

    M.Azuma, K.Maekawa, A.Yamashita, K.Yokogami, M.Enzaki, Z.A.Khant, H.Takeshima, Y.Asada, Y.Wang, T.Hirai

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    受賞区分:国内学会・会議・シンポジウム等の賞 

  • Certificate of Merit

    2020年7月   European Congress of Radiology   Detectability of renal cell carcinoma on CT in Japanese patients by using an AI algorithm with US patient data

    M.Azuma, N.Terada, S.Mukai, D.-A.Bunu, T.Okada, T.Kamoto, K.Araki, T.Hirai

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    受賞区分:国際学会・会議・シンポジウム等の賞 

  • 最優秀会長賞

    2020年6月   日本医学放射線学会   Prevalence of sellar spine in patients with central precocious puberty

    Minako Azuma

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    受賞区分:国内学会・会議・シンポジウム等の賞 

科研費(文科省・学振・厚労省)獲得実績 【 表示 / 非表示

  • Synthetic MRIによる脳腫瘍の定量的評価:真の性状や拡がりを捉える手法の確立

    研究課題/領域番号:24K10787  2024年04月 - 2027年03月

    独立行政法人日本学術振興会  科学研究費基金  基盤研究(C)

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    担当区分:研究代表者 

  • 神経変性疾患に対する定量的磁化率マッピングの有用性の検討

    研究課題/領域番号:16K19835  2016年04月 - 2019年03月

    科学研究費補助金  若手研究(B)

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    担当区分:研究代表者 

受託研究受入実績 【 表示 / 非表示

  • 膠芽腫のIDH遺伝子変異と関連するMRI画像所見の検討

    2017年10月 - 2020年12月

    バイエル薬品株式会社  一般受託研究 

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    担当区分:研究代表者  受託研究区分:一般受託研究

寄附金・講座・研究部門 【 表示 / 非表示

  • 病態解析医学講座放射線医学分野研究奨学金

    寄附者名称:特定非営利活動法人先端画像宮崎ネットワーク 2024年03月

  • 病態解析医学講座放射線医学分野研究奨学金

    寄附者名称:医療法人杏林会 三股病院 2024年02月

  • 病態解析医学講座放射線医学分野研究奨学金

    寄附者名称:一般社団法人 延岡市医師会延岡市医師会病院 2024年02月

  • 病態解析医学講座放射線医学分野研究奨学金

    寄附者名称:公益社団法人宮崎市郡医師会 2024年01月

  • 病態解析医学講座放射線医学分野研究奨学金

    寄附者名称:ゲルベ・ジャパン株式会社 2023年11月

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