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Useful Imaging to detect Macrophage Localization in the Media and Adventitia of the Abdominal Aortic Aneurysm Wall using Ex Vivo Superparamagnetic Iron Oxide-Enhanced Magnetic Resonance Imaging

Research Project

Project/Area Number 15K10232
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Cardiovascular surgery
Research InstitutionTohoku University

Principal Investigator

Shimizu Takuya  東北大学, 医学系研究科, 大学院非常勤講師 (70579755)

Co-Investigator(Kenkyū-buntansha) 後藤 均  東北大学, 医学系研究科, 准教授 (00400333)
大田 英揮  東北大学, 医学系研究科, 准教授 (40586905)
中村 保宏  東北大学, 医学系研究科, 大学院非常勤講師 (80396499)
Research Collaborator UMETSU Michihisa  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
KeywordsSPIO MRI / 腹部大動脈瘤 / マクロファージの局在診断 / SPIO MRI / 組織画像診断 / MRI
Outline of Final Research Achievements

Macrophages in the aneurysmal wall play an important role in the pathogenesis of abdominal aortic aneurysms (AAAs). superparamagnetic iron oxide (SPIO) is a macrophage-specific contrast agent that result in negative enhancement on T2*-weighted imaging. We attempted to evaluate macrophage localization in the media and adventitia of AAA wall using SPIO-enhanced MRI. Ex vivo MRI was performed for the specimens in SPIO group. There was significant positive correlation between berlin blue-stained macrophages and berlin blue positive area in SPIO group with macrophages. We divided the media and adventitia in each specimen and compared the ROI of T2*-weighted SPIO-enhanced MRI with berlin blue-stained area. We found significant correlations in 5 of 7 cases with macrophages. We detected that ex vivo T2*-weighted SPIO-enhanced MR findings visualize a macrophage localization in the media and adventitia. This imaging technique would also visualize the macrophage distribution in in-vivo MRI.

Academic Significance and Societal Importance of the Research Achievements

腹部大動脈瘤が拡大する要因はいくつか報告されているものの、十分には解明されていない。瘤壁内のマクロファージが瘤形成に強く関わっているという組織学的な報告があるが、組織を取らずとも、瘤壁内のマクロファージの局在を示す方法=可視化ができれば、将来大きくなりやすい瘤なのか、破裂しやすい瘤なのか、新たな指標に繋がる可能性がある。その第一段階として、採取した瘤壁のMRIと組織標本のマクロファージの局在に相関関係があることを明らかにした。今後生体内へ応用することで、新たな指標に繋がる可能性がある。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (1 results)

All 2019

All Presentation (1 results)

  • [Presentation] 超常磁性酸化鉄造影剤を用いた核磁気共鳴画像法による腹部大動脈瘤の中膜および外膜内の組織マクロファージの局在評価2019

    • Author(s)
      梅津道久
    • Organizer
      日本外科学会
    • Related Report
      2018 Annual Research Report

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Published: 2015-04-16   Modified: 2020-03-30  

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