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Wound and repair mechanism in ovariectomized rats with periodontitis -Direct action of estrogen and transition of HSP expression

Research Project

Project/Area Number 19K10862
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 58060:Clinical nursing-related
Research InstitutionKanagawa Dental College

Principal Investigator

Amano Kaori  神奈川歯科大学, 歯学部, 准教授 (70316470)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsOVX / エストロゲン欠乏 / 実験的歯周炎 / 軽度機械刺激と損傷 / β-エストラジオール / C-Fos / HSP70 / 唾液分泌減少 / C-fos / P.gingivalis / 中軽度機械刺激 / 唾液腺加齢変化 / 細胞損傷機構 / 卵巣摘出ラット / 歯周炎 / エストロゲン / HSP
Outline of Research at the Start

女性の閉経前後にエストロゲンの急速な減少により生じる様々な関連疾患の中で、本研究では歯周炎について注目しエストロゲンの補充・非補充環境において、治療に連動するような機械的刺激を与えた場合、症状に直接影響するか否かを検討する。
またHSP70など熱ショックタンパクの発現はエストロゲン存在下で変動があるのか、または拮抗作用が起こるのか等を同様に観察・検討する。
実験には卵巣摘出モデルラットを使用し、歯周炎を実験的に惹起させて行う。

Outline of Final Research Achievements

The aim of this study was to observe the level of tissue cell disruption in OVX rats when inflammation such as periodontitis was induced in an estrogen-deficient environment. A total of 30 female rats were used in this experiment: 24 eight-week-old OVX rats in the experimental group and 6 sham rats in the control group.
To induce periodontitis, P. gingivalis (P. g) was used. OVX rats were further divided into three: regular food, food containing soy isoflavones, and implanted with E2 pellets. After 60 days, the mandibular central incisor gingiva and the tongue were brushed with an electric toothbrush under anesthesia for 1 minute. 3 hours after brushing, all rats were perfused . C-fos and HSP70 antibody was used as the labeling marker for the injured cells.
C-fos expression was abundantly observed in the injured cells of both gum and tongue muscle tissue just below the epithelium in the P.g infected group. HSP70 expression in OVX rats were clearly lower than that in sham rats.

Academic Significance and Societal Importance of the Research Achievements

歯周炎の罹患率は40歳以降から急速に上昇するが, 特に閉経前後に増加傾向となる病態機構について, エストロゲンの減少が直接影響しているか否かは未だに解明されていない。 骨粗鬆症との関連性が報告されているが現段階では,あくまで憎悪因子の一つという位置づけとなる。一方, 歯周炎の直接因子と考えられている加齢に伴う唾液分泌量の減少がエストロゲン補充により軽減すると多数の報告があり, エストロゲン欠乏は種々のリスク因子上昇に確実に関与しているといえる。
本課題の意義は実験的に歯周炎を惹起させたOVXラットを使用しエストロゲン補充が歯周炎の進行に直接関与するのか否かを解明する事である。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (4 results)

  • [Journal Article] Changes in the microcirculation in periodontal tissue due to experimental peri-implantitis2021

    • Author(s)
      Yamamoto Reiko、Amano Kaori、Takahashi Satoko-Wada、To Masahiro、Takahashi Shunsuke、Matsuo Masato
    • Journal Title

      Journal of Oral Biosciences

      Volume: online Issue: 2 Pages: 1-8

    • DOI

      10.1016/j.job.2021.03.002

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Morphological study of human facial fascia and subcutaneous tissue structure by region through SEM observation2020

    • Author(s)
      Amano Kaori、Naito Michiko、Matsuo Masato
    • Journal Title

      Tissue and Cell

      Volume: 67 Pages: 101437-101437

    • DOI

      10.1016/j.tice.2020.101437

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Study of morphological structure in human fetus Wharton’s duct opening area.2019

    • Author(s)
      Moriyama H, Amano K
    • Journal Title

      International Journal of Pediatric Otorhinolaryngology

      Volume: 124 Pages: 18-21

    • DOI

      10.1016/j.ijporl.2019.05.009

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Correlation between estrogen level and periodontal disease progression in OVX rats.2021

    • Author(s)
      天野カオリ
    • Organizer
      歯科基礎医学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 実験的歯周炎を惹起させたOVXラットにおける唾液腺の形態学的観察.2021

    • Author(s)
      天野カオリ
    • Organizer
      日本唾液腺学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 卵巣摘出ラットモデル口腔組織細胞への軽度機械的刺激における損傷について2021

    • Author(s)
      天野カオリ, 山本麗子, 松尾雅斗
    • Organizer
      神奈川歯科大学・歯学会総会
    • Related Report
      2020 Research-status Report
  • [Presentation] Morphological study of human facial and subcutaneous tissue structure by histological observation2020

    • Author(s)
      Amano K, Inaba K, Hidaka K, Yamamoto R, Matsuo M
    • Organizer
      第62回歯科基礎医学会全国学術集会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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