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Is the onset of hypertension due to a sympathetic chronic inflammatory response to excessive salt intake in childhood?

Research Project

Project/Area Number 20K11623
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 59040:Nutrition science and health science-related
Research InstitutionNara Women's University

Principal Investigator

Yoshimoto Misa  奈良女子大学, 生活環境科学系, 教授 (20418784)

Co-Investigator(Kenkyū-buntansha) 三木 健寿  奈良女子大学, 大和・紀伊半島学研究所, 協力研究員 (80165985)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords高血圧 / 高食塩食 / 腎交感神経活動 / 腰部交感神経活動 / 心拍数 / ラット / 交感神経活動 / 幼少期 / 食塩負荷 / 食塩感受性
Outline of Research at the Start

日本だけでなく世界規模で中高年の健康維持のため減塩が広く推奨されている。成人の食塩摂取に対する動脈圧の応答は若年期の食塩摂取に依存する事が示唆されているが、実験的に幼少期あるいは若年期の高塩分食摂取が成人期以降の血圧にどの様に影響するかはほとんど検討されていない。本研究では、若年ラットと成長期以降のラットを用いて食塩摂取の時期・期間・量と交感神経活動および循環機能の相互関係を検討すること、および過剰な食塩摂取が交感神経活動を介した免疫機能異常を引き起こし血管内皮細胞の機能不全リスクをつくるかを検討することを目的とする。これらの結果から、年齢に即した新しい食塩摂取基準の基礎データの作成を目指す。

Outline of Final Research Achievements

The purpose of this study was to clarify whether excessive salt intake in childhood causes hypertension that develops later in adulthood, and to examine the trends in sympathetic nervous activity during the development of hypertension caused by excessive salt intake in childhood, that is, how sympathetic nervous activity influences the development of hypertension, by directly measuring the actual sympathetic nervous activity in rats. We began measuring sympathetic nerve activity in rats fed a 4% salt diet from the age of 3 weeks immediately after weaning, and then began measuring sympathetic nerve activity from the age of 6 weeks to 21 weeks, dividing the time period into separate periods.
The results showed that arterial pressure increased until 10 weeks of age and remained constant thereafter. Heart rate also decreased until 10 weeks of age and remained almost constant thereafter. However, there were no significant changes in sympathetic nerve activity during either period.

Academic Significance and Societal Importance of the Research Achievements

食塩摂取に対する動脈圧の応答は、若年期の食塩摂取に依存する事が示唆されているが、実験的に幼少期あるいは若年期の高塩分食摂取が成人期以降の血圧にどの様に影響するかはほとんど検討されていない。本研究結果は、離乳直後から高食塩食を摂餌させ、幼少期の高食塩食が血圧上昇を引き起こしている事を示した。
さらに、高血圧発症の原因が交感神経活動の過剰亢進であると考えられているが、本研究結果から、高血圧発症時、交感神経活動は増加しない事を示した。高血圧発症のメカニズムは不明であるが、これまでの説を覆したことは、学術的・社会的意義がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 2020

All Journal Article (4 results) (of which Open Access: 4 results,  Peer Reviewed: 2 results) Presentation (11 results) (of which Invited: 1 results)

  • [Journal Article] Simultaneous measurement of central amygdala neuronal activity and sympathetic nerve activity during daily activities in rats2022

    • Author(s)
      Shizuka Ikegame, Misa Yoshimoto, Kenju Miki
    • Journal Title

      Experimental Physiology

      Volume: 107(9) Issue: 9 Pages: 1071-1080

    • DOI

      10.1113/ep090538

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Changes in sympathetic nerve activity and arterial pressure regulation induced by exercise2022

    • Author(s)
      Misa Yoshimoto and Kenju Miki
    • Journal Title

      The Autonomic Nervous System

      Volume: 59 Issue: 3 Pages: 293-299

    • DOI

      10.32272/ans.59.3_293

    • ISSN
      0288-9250, 2434-7035
    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Regional Differences in Sympathetic Nerve Activity Are Generated by Multiple Arterial Baroreflex Loops Arranged in Parallel2022

    • Author(s)
      Kenju Miki, Shizuka Ikegame and Misa Yoshimoto
    • Journal Title

      frontiers

      Volume: 35444564 Pages: 1-8

    • DOI

      10.3389/fphys.2022.858654

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Differential shifts in baroreflex control of renal and lumbar sympathetic nerve activity induced by freezing behaviour in rats2021

    • Author(s)
      Naomi Kondo, Misa Yoshimoto, Shizuka Ikegame and Kenju Miki
    • Journal Title

      Experimental Physiology

      Volume: 106(10) Issue: 10 Pages: 2060-2069

    • DOI

      10.1113/ep089742

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Theta wave synchronization between hippocampus field potential and electroencephalogram induced by restrained water immersion in rats2023

    • Author(s)
      Misa Yoshimoto, Natumi Morimoto, Shizuka Ikegame, Kenju Miki
    • Organizer
      The 100th Anniversary Annual Meeting of The Physiological Society of Japan
    • Related Report
      2022 Annual Research Report
  • [Presentation] Simultaneous suppression of cervical vagal nerve and sympathetic nerve activity induced by intravenous alpha-2 adrenergic receptor agonist administration in conscious rats2023

    • Author(s)
      Kenju Miki, Haruka Inoue, Yuki Kitagawa, Shizuka Ikegame, Misa Yoshimoto
    • Organizer
      The 100th Anniversary Annual Meeting of The Physiological Society of Japan
    • Related Report
      2022 Annual Research Report
  • [Presentation] Vagal nerve activity and sympathetic nerve activity are suppressed by alpha-2 adrenergic receptor agonists in consious rats2023

    • Author(s)
      Kenju Miki, Shizuka Ikegame, Misa Yoshimoto
    • Organizer
      American Physiology Summit
    • Related Report
      2022 Annual Research Report
  • [Presentation] レム睡眠期の迷走神経活動と交感神経活動が動脈圧調節に果たす役割2023

    • Author(s)
      吉本光佐、池亀静香、三木健寿
    • Organizer
      第 17 回環境生理学プレコングレス
    • Related Report
      2022 Annual Research Report
  • [Presentation] 迷走神経活動の計測2022

    • Author(s)
      三木健寿、吉本光佐
    • Organizer
      第75回自律神経学会総会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] バゾプレッシンニューロンの選択的刺激が腎と腰部交感神経活動および循環動態に及ぼす影響2022

    • Author(s)
      吉本 光佐、高井 香里、武井 珠里、宮浦 和奏、森本 夏実、池亀 静香、丸山 崇、上田 陽一、三木 健寿
    • Organizer
      第99回日本生理学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 意識下ラットでの迷走神経活動と交感神経活動の同時計測2022

    • Author(s)
      三木 健寿、宮浦 和奏、池亀 静香、吉本 光佐
    • Organizer
      第99回日本生理学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 意識下ラットにおける恐怖記憶の想起は室傍核神経活動と交感神経活動にどのような影響を及ぼすか2022

    • Author(s)
      池亀静香、三木健寿、吉本光佐
    • Organizer
      第99回日本生理学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 運動による交感神経活動と動脈圧調節の変化2021

    • Author(s)
      吉本光佐、三木健寿
    • Organizer
      第74回日本自律神経学会総会
    • Related Report
      2021 Research-status Report
  • [Presentation] 意識下ラットにおける化学遺伝学的バゾプレッシン神経刺激による室傍核大細胞性神経内分泌ニューロンとプレ自律神経ニューロンのクロストーク2021

    • Author(s)
      森本 夏実、三木健寿、 吉本光佐
    • Organizer
      第98回 日本生理学会大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 閉塞性睡眠時無呼吸が海馬領域血流量と海馬CA1神経活動に与える影響と交感神経の関与2020

    • Author(s)
      矢口佳奈、三木健寿、 吉本光佐
    • Organizer
      第59回日本生気象学会大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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