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2017 Fiscal Year Annual Research Report

Elucidation of novel pathophysiology underlysing lethal arrhythmia due to mutations in cardiac ion transporters

Research Project

Project/Area Number 15H04823
Research InstitutionNagasaki University

Principal Investigator

蒔田 直昌  長崎大学, 医歯薬学総合研究科(医学系), 教授 (00312356)

Co-Investigator(Kenkyū-buntansha) 吉浦 孝一郎  長崎大学, 原爆後障害医療研究所, 教授 (00304931)
牧山 武  京都大学, 医学研究科, 助教 (30528302)
渡邊 泰秀  浜松医科大学, 医学部, 教授 (50305380)
Project Period (FY) 2015-04-01 – 2018-03-31
KeywordsNa-Ca交換体 / トランスポータ / 遺伝子変異 / J波 / QT短縮症候群 / パッチクランプ / ゲノム編集
Outline of Annual Research Achievements

心電図の早期再分極パターン(J波)は長らく良性所見と考えられてきたが、心室細動や突然死との関連が判明するとともに、早期再分極症候群(ERS)という致死性不整脈の独立した疾患概念が生まれた。申請者はERSの原因を解明するために、心室細動の既往のあるERS患者50人に対して心臓関連457遺伝子パネルのシークエンス解析を行い、7家系で心筋Na/Ca交換体(NCX1)の遺伝子SLC8A1に変異を同定した。COS-7細胞に変異NCX1を発現させパッチクランプ法でNCX1電流を測定すると、変異NCX1は無機能または野生型よりも有意に電流量が低下していた。変異NCX1は45Ca取り込み能が低下し、膜のビオチン化と免疫染色実験から、3つの変異では膜トラフィッキング異常も同定された。さらに、ヒト心室筋のコンピュータシミュレーション(姫野モデル)を使って活動電位を計測したところ、NCX1電流の50%低下によって活動電位持続時間が有意に短縮することが判明した。以上の結果から、QT短縮とJ波を特徴とする心室細動の原因として、これまで知られていなかった心筋トランスポータ遺伝子の異常が明らかになった。

Research Progress Status

平成29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成29年度が最終年度であるため、記入しない。

  • Research Products

    (27 results)

All 2019 2018

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results) Presentation (19 results) (of which Int'l Joint Research: 10 results,  Invited: 11 results) Book (3 results)

  • [Journal Article] Association of Genetic and Clinical Aspects of Congenital Long QT Syndrome With Life-Threatening Arrhythmias in Japanese Patients2019

    • Author(s)
      Shimizu W., Makita N. et al
    • Journal Title

      JAMA Cardiol

      Volume: 4 Pages: 246-254.

    • DOI

      10.1001/jamacardio.2018.4925

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] HCN4 Gene Polymorphisms Are Associated With Occurrence of Tachycardia-Induced Cardiomyopathy in Patients With Atrial Fibrillation2018

    • Author(s)
      Nakano Y., Ochi H., Sairaku A., Onohara Y., Tokuyama T., Motoda C., Matsumura H., Tomomori S., Amioka M., Hironobe N., Ohkubo Y., Okamura S., Makita N., Yoshida Y., Chayama K., Kihara Y.
    • Journal Title

      Circ Genom Precis Med

      Volume: 11 Pages: e001980.

    • DOI

      10.1161/CIRCGEN.117.001980

    • Peer Reviewed
  • [Journal Article] Clinical Manifestations and Long-Term Mortality in Lamin A/C Mutation Carriers From a Japanese Multicenter Registry2018

    • Author(s)
      Nakajima K., Makita N et al.
    • Journal Title

      Circ J

      Volume: 82 Pages: 2707-2714.

    • DOI

      10.1253/circj.CJ-18-0339

    • Peer Reviewed
  • [Journal Article] HCN4 pacemaker channels attenuate the parasympathetic response and stabilize the spontaneous firing of the sinoatrial node2018

    • Author(s)
      Kozasa Y., Nakashima N., Ito M., Ishikawa T., Kimoto H., Ushijima K., Makita N., Takano M.
    • Journal Title

      J Physiol

      Volume: 596 Pages: 809-825.

    • DOI

      10.1113/JP275303

    • Peer Reviewed
  • [Journal Article] Lack of genotype-phenotype correlation in Brugada Syndrome and Sudden Arrhythmic Death Syndrome families with reported pathogenic SCN1B variants2018

    • Author(s)
      Gray B., Hasdemir C., Ingles J., Aiba T., Makita N., Probst V., Wilde A. A. M., Newbury-Ecob R., Sheppard M. N., Semsarian C., Sy R. W., Behr E. R.
    • Journal Title

      Heart Rhythm

      Volume: 15 Pages: 1051-1057.

    • DOI

      10.1016/j.hrthm.2018.03.015

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 不整脈症候群で心臓が構造的に正常な患者における心筋症の原因遺伝子変異の特定2018

    • Author(s)
      八木原伸江, 渡部裕, 蒔田直昌, 堀江稔, 清水渉, 大野聖子, 長谷川奏恵, 相庭武司, 田中敏博, 角田達彦, 重水大智, 徹 南野
    • Organizer
      第82回日本循環器学会学術集会
  • [Presentation] CaMKII as a target for novel therapy to treat lethal ventricular tachyarrhythmias.2018

    • Author(s)
      辻幸臣, 蒔田直昌
    • Organizer
      第57回日本生体医工学学会大会
  • [Presentation] CALM2関連性QT延長症候群iPSCモデルにおいて、l-cis-diltiazemは遅延したL型calciumチャネルの不活性化をさらに強める2018

    • Author(s)
      横井文香, 牧山武, 山本雄大, 張田健志, Yimin Wuriyanghai, 早野護, 西内英, 糀谷泰彦, 廣瀬紗也子, 高景山, 大野聖子, 豊田太, 吉田善紀, 蒔田直昌, 堀江稔, 木村剛
    • Organizer
      第82回日本循環器学会学術集会
  • [Presentation] Torsadogenic Action Of Late Na+ Current In Experimental Electrical Storm2018

    • Author(s)
      Yamazaki M., Tsuji Y. , Niwa R., Tomii N., Arafune T., Honjo H., Dobrev D., Nattel S., Kodama I., Sakuma I., Makita N.
    • Organizer
      The 39th Heart Rhythm Society Scientific Sessions
    • Int'l Joint Research / Invited
  • [Presentation] Single Cell Electrophysiological Analysis of Human iPS Cell-Derived Cardiomyocytes Generated from Long-QT Syndrome Patients Carrying a CALM2 Mutation Using a Membrane Voltage Imaging System2018

    • Author(s)
      Yamamoto Y., Makiyama T, Wuriyanghai Y., Kohjitani H., Hirose S., Gao J, Kashiwa A., Kimura T., Ishikawa T., Motomura H., Makita N, Ohno S., Chonabayashi K., Yoshida Y., Suda K., Horie M
    • Organizer
      The 11th Asia Pacific Heart Rhythm Society Scientific Session
    • Int'l Joint Research / Invited
  • [Presentation] The inactivation of L-type Ca2+ Channel was impaired in Human iPS Cell Model of Long-QT Syndrome with CALM2-D134H Mutation.2018

    • Author(s)
      Yamamoto Y., Makiyama T., Harita T., Hayano M., Nishiuchi S., Wuriyanghai Y., Kohjitani H., Hirose S., Yokoi F., Ishikawa T., Ohno S., Chonabayashi K., Suda K., Yoshida Y., Horie M., Makita N., Kimura T.
    • Organizer
      第82回日本循環器学会学術集会
  • [Presentation] Duration Predicts Events In Caucasians With E1784K-SCN5A: The E1784K International Consortium2018

    • Author(s)
      Wijeyeratne Y. , Makita N. et al
    • Organizer
      The 39th Heart Rhythm Society Scientific Sessions
    • Int'l Joint Research / Invited
  • [Presentation] Mechanisms of Electrical Storm Associated With QT Prolongation: Successful Mapping of Torsades de Pointes in Rabbits2018

    • Author(s)
      Tsuji Y., Yamazaki M., Niwa R., Tomii N., Arafune T., Honjo H., Dobrev D., Nattel S., Kodama I., Sakuma I., Makita N
    • Organizer
      American Heart Association Annual Scientific Sessions 2018
    • Int'l Joint Research / Invited
  • [Presentation] HCN4 Polymorphisms and Tachycardia Induced Cardiomyopathy2018

    • Author(s)
      Nakano Y., Ochi H., Onohara Y., Sairaku A., Tokuyama T., Motoda C., Matsumura H., Tomomori S., Amioka M., Hironobe N., Ohkubo Y., Okamura S., Makita N., Yoshida Y., Chayama K., Kihara Y.
    • Organizer
      The 65th Annual Meeting of the Japan Heart Rhythm Society
  • [Presentation] Clinical Manifestations and Long-term Mortality in Lamin A/C Mutation Carriers from the Japanese Multicenter Registry2018

    • Author(s)
      Nakajima K., Aiba T., Makiyama T., Nishiuchi S., Ohno S., Doi T., Shizuta S., Onoue K., Yagihara N., Ishikawa T., Watanabe I., Oginosawa Y., Nogami A., Aonuma K., Saitoh Y., Kimura T., Makita N., Shimizu W., Horie M., Kusano K.
    • Organizer
      The 65th Annual Meeting of the Japan Heart Rhythm Society
  • [Presentation] Genotype-Dependent Differences in Short QT Syndrome2018

    • Author(s)
      Makita N.
    • Organizer
      The 11th Asia Pacific Heart Rhythm Society Scientific Session
    • Int'l Joint Research / Invited
  • [Presentation] Atrial Conduction Defects Caused by a Connexin45 Mutation2018

    • Author(s)
      Makita N.
    • Organizer
      The 11th Asia Pacific Heart Rhythm Society Scientific Session
    • Int'l Joint Research / Invited
  • [Presentation] Novel Arrhythmia Syndrome Associated with Gap Junction Mutations2018

    • Author(s)
      Makita N.
    • Organizer
      The 11th Asia Pacific Heart Rhythm Society Scientific Session
    • Int'l Joint Research / Invited
  • [Presentation] Clinical and Genetic Basis of Calmodulinopathy2018

    • Author(s)
      Makita N.
    • Organizer
      The 11th Asia Pacific Heart Rhythm Society Scientific Session
    • Int'l Joint Research / Invited
  • [Presentation] Pathophysiology of Inherited Arrhythmias Associated with Ca Handling Abnormality2018

    • Author(s)
      Makita N.
    • Organizer
      The 65th Annual Meeting of the Japan Heart Rhythm Society
    • Invited
  • [Presentation] Mutation Hot-spot-based Risk Stratification In Long QT Syndrome Type 1: Data From A Nationwide Japanese LQT Registry2018

    • Author(s)
      Kashiwa A., Aiba T., Makimoto H., Yamagata K. , Keiko S. , Yagihara N., Watanabe H. , Ohno S., Hayashi K. , Sumitomo N., Yoshinaga M. , Morita H., Miyamoto Y. , Makita N. , Horie M., Yasuda S., Kusano K., Shimizu W. , The_Japanese_LQTS_registry_investigators.
    • Organizer
      The 39th Heart Rhythm Society Scientific Sessions
    • Int'l Joint Research / Invited
  • [Presentation] Cardiac Connexin Syndrome: A New Inherited Cardiac Conduction Disease Entity with Distinct Electrophysiological and Extracardiac Manifestations.2018

    • Author(s)
      Ishikawa T., Seki A., Hagiwara N., Makita N.
    • Organizer
      第82回日本循環器学会学術大会
  • [Presentation] Rare Coding Variants in Genes Other Than SCN5A Are Minimal Genetic Burden on the Prognosis of Brugada Syndrome2018

    • Author(s)
      Ishikawa T., Mishima H., Ohno S., T. Aiba, Nakano Y., Aizawa Y., Nakajima T., Hayashi K., Murakoshi N., Yagihara N., Kimoto H., Makiyama T., Watanabe H., Morita H., Yoshiura K., Nogami A., Shimizu W., Horie M., Tanaka T., Makita N.
    • Organizer
      The 65th Annual Meeting of the Japan Heart Rhythm Society
  • [Presentation] Lack Of Genotype-phenotype Correlation In Brugada Syndrome And Sudden Arrhythmic Death Syndrome Families With Reported Pathogenic SCN1B Variants2018

    • Author(s)
      Gray B. , Hasdemir C. , Ingles J. , Aiba T., Makita N. , PROBST V. , Wilde A., Semsarian C. , Sy R., Behr E.
    • Organizer
      The 39th Heart Rhythm Society Scientific Sessions
    • Int'l Joint Research / Invited
  • [Book] 標準生理学 第9版2019

    • Author(s)
      蒔田直昌 (本間 研一 編)
    • Total Pages
      1172
    • Publisher
      医学書院
    • ISBN
      978-4-260-03429-6
  • [Book] 循環器内科専門医バイブル2018

    • Author(s)
      辻幸臣・蒔田直昌(小室一成・平尾見三 編)
    • Total Pages
      376
    • Publisher
      中山書店
    • ISBN
      978-4-521-74585-5
  • [Book] 循環器科の心電図: ECG for Cardiologists2018

    • Author(s)
      石川泰輔 蒔田直昌(村川裕二 編)
    • Total Pages
      215
    • Publisher
      南江堂
    • ISBN
      978-4-524-23791-3

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Published: 2019-12-27  

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