• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Effects of dioxin exposure on brain regional volumes and connectivity between among regions in highly exposed male residents in Vietnam

Research Project

Project/Area Number 18K19709
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 58:Society medicine, nursing, and related fields
Research InstitutionKanazawa Medical University

Principal Investigator

NISHIJO Muneko  金沢医科大学, 医学部, 教授 (40198461)

Co-Investigator(Kenkyū-buntansha) 的場 宗孝  金沢医科大学, 医学部, 教授 (90288308)
Project Period (FY) 2018-06-29 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsダイオキシン / MRI / 脳領域体積 / 脳領域間結合 / 成人男性 / 周産期曝露 / 血中ダイオキシン / VBM法 / 周産期暴露 / DTI法 / VBM / 脳領域 / 体積 / 領域間結合 / 成人 / 男性 / 脳 / 性ホルモン / プロラクチン
Outline of Final Research Achievements

Our subjects included 32 men who are fathers from Bien Hoa birth cohort in Vietnam. Blood dioxin levels and perinatal dioxin exposure suspected from residency of their mothers in Bien Hoa during pregnancy were used as dioxin exposure markers. T1-weighted images and diffusion tensor images (DTI) by brain MRI scan were subjected to regional volume analysis using the VBM tool and to regional connectivity indicated by fractional anisotropy (FA) using DT tractography.
Significant inverse associations were found between blood TCDD and fusiform gyrus volume, and between TEQ-PCDDs and temporal pole volume. FA values in high blood TCDD group were lower in right and left cingulum hippocampal part and right uncinate fasciculus. In men with suspected perinatal dioxin exposure, the left inferior frontal gyrus pars orbitalis volume was significantly lower, whereas the total gray matter volume was significantly higher. FA value in left uncinate fasciculus was lower in men with perinatal exposure.

Academic Significance and Societal Importance of the Research Achievements

近年、ベトナム戦争で枯葉剤曝露を受けたアメリカ退役軍人にアルツハイマー型認知症に罹患する者が多いことが報告され、ダイオキシン曝露の脳への影響が注目されている。これまでにも、小児の脳神経発達にダイオキシン曝露が負の影響を与えることが、欧米での研究で報告され、我々もベトナムの旧米軍基地周辺の出生コホートにおいて同様な報告を行ってきた。しかし、本研究では、小児には実施することが困難であったMRI検査を実施することにより、ダイオキシン曝露による脳への器質的な変化を明らかにすることができたことは、学術的に意義深く、ダイオキシンの神経毒性を明らかにする上で重要な知見を得ることができたと考えている。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results)

  • [Int'l Joint Research] ベトナム軍医科大学/ベトナム厚生省(ベトナム)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ベトナム軍医科大学/ベトナム厚生省(ベトナム)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ベトナム軍医科大学(ベトナム)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ベトナム軍医科大学/ベトナム厚生省(ベトナム)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Alterations in Regional Brain Regional Volume Associated with Dioxin Exposure in Men Living in the Most Dioxin-Contaminated Area in Vietnam: Magnetic Resonance Imaging (MRI) Analysis Using Voxel-Based Morphometry (VBM)2021

    • Author(s)
      Vu Hoa Thi、Pham Thao Ngoc、Yokawa Takashi、Nishijo Muneko、The Tai Pham、Do Quyet、Nishino Yoshikazu、Nishijo Hisao
    • Journal Title

      Toxics

      Volume: 9 Issue: 12 Pages: 353-353

    • DOI

      10.3390/toxics9120353

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effects of perinatal dioxin exposure on neonatal electroencephalography (EEG) activity of the quiet sleep stage in the most contaminated area from Agent Orange in Vietnam2021

    • Author(s)
      Pham NT, Nishijo M, Nghiem TTG, Pham TT, Tran NN, Le VQ, Vu TH, Tran HA, Phan HAV, Do Q, Takiguchi T, Nishino Y, Nishijo H
    • Journal Title

      Int J Hyg Environ Health

      Volume: 232 Pages: 113661-113661

    • DOI

      10.1016/j.ijheh.2020.113661

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dioxin exposure and sexual dimorphism of gaze behavior in prepubertal Vietnamese children living in Da Nang, a hot spot for dioxin contamination2020

    • Author(s)
      Pham TN, Nishijo M, Pham TT, Vu HT, Tran NN, Tran AH, Do Q, Takiguchi T, Nishino Y, Nishijo H
    • Journal Title

      Sci Total Environ

      Volume: 749 Pages: 141083-141083

    • DOI

      10.1016/j.scitotenv.2020.141083

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ベトナムの最も汚染された地域に居住する男性における周産期曝露の脳領域体積への影響2022

    • Author(s)
      Vu Thi Hoa, Pham Ngoc Thao, 西条旨子, 余川隆, Pham The Tai, 瀧口知彌, 西野善一、西条寿夫
    • Organizer
      第92回日本衛生学会総会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Effects of dioxin exposure on brain regional volumes analyzed using VBM technology in men living in the most dioxin-contaminated area in Vietnam2022

    • Author(s)
      Vu Thi Hoa, Muneko Nishijo, Pham Ngoc Thao, Takashi Yokawa, Pham The Tai, Do Quyet, Yoshikazu Nishino, Hisao Nishijo
    • Organizer
      日本衛生学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] Effects of dioxin exposure on brain regional volumes analyzed using VBM technology in men living in the most dioxin-contaminated area in Vietnam2021

    • Author(s)
      Vu Thi Hoa, Muneko Nishijo, Pham Ngoc Thao, Takashi Yokawa, Pham The Tai, Do Quyet, Yoshikazu Nishino, Hisao Nishijo
    • Organizer
      第91回日本衛生学会総会
    • Related Report
      2020 Research-status Report

URL: 

Published: 2018-07-25   Modified: 2024-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi