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Effects of dietary components on SARS-CoV-2 infection

Research Project

Project/Area Number 22K05478
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 38050:Food sciences-related
Research InstitutionKyoto Prefectural University of Medicine

Principal Investigator

Ohgitani Eriko  京都府立医科大学, 医学(系)研究科(研究院), 特任准教授 (80300820)

Co-Investigator(Kenkyū-buntansha) 佐藤 健司  京都大学, 農学研究科, 教授 (00202094)
新屋 政春  京都府立医科大学, 医学(系)研究科(研究院), 講師 (10405277)
小谷 晋一郎  京都府立医科大学, 医学部, 研究員 (30783964)
松田 修  京都府立医科大学, 医学(系)研究科(研究院), 教授 (00271164)
Project Period (FY) 2022-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsSARS-CoV-2 / カテキン / 変異株 / COVID-19 / 茶 / EGCG / テアフラビン類 / 抗ウイルス効果 / 天然化合物
Outline of Research at the Start

SARS-CoV-2は、主として感染者の唾液中のウイルスが飛沫を通じて伝播する。我々は、唾液中のウイルスを不活化する方策として、食品成分でSARS-CoV-2を不活化する可能性を考え、そのような食品成分を探索した。その結果、茶(緑茶、ほうじ茶、ウーロン茶、紅茶等)で処理すると、SARS-CoV-2の感染力が著しく低下することを見出した。緑茶に含まれるEGCG、紅茶に含まれるガレート型テアフラビン類等にこの SARS-CoV-2不活化活性があることを見出した。我々はさらに、未知の活性成分も見出している。そこで本研究ではこれら分子の同定とウイルス不活化の分子機構解析等を行い、COVID-19の感染拡大抑制に寄与する知見の確立を目指す。

Outline of Final Research Achievements

In this study we examined inactivation effects of catechins and galloylated theaflavins on some subvariant strains of the Omicron mutant of the SARS-CoV-2. Each subvariants showed different susceptibilities to EGCG and TFDG, which may be derived from the different degree of inhibition of the interaction between the receptor binding domain (RBD) and ACE2 by these compounds. A specific amino acid mutation (N4609K) affected the binding of EGCG to RBD, while other mutations (G446S and F490S) influenced the binding of TFDG to RBD.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、COVID-19のみならず今後勃発する可能性があるさまざまな新興・再興ウイルス感染症に対して、感染防御、感染拡大阻止と予防のために有益な基礎的情報を提供するものであり、社会的意義は大きい。さらに学術的にも、ウイルス感染の分子機構と天然化合物によるその阻害について新しい重要な知見をもたらすと考えらえる。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • Research Products

    (5 results)

All 2025 2024 2023

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 5 results)

  • [Journal Article] Antiviral Cellulose-Lignin Assembly Entirely Composed of Plant Cell Wall Components2025

    • Author(s)
      Kimura Chihiro、Ohgitani Eriko、Mazda Osam、Watanabe Takashi
    • Journal Title

      Applied Biochemistry and Biotechnology

      Volume: - Issue: 6 Pages: 3856-3870

    • DOI

      10.1007/s12010-025-05184-6

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Raman signatures of type A and B influenza viruses: molecular origin of the “catch and kill” inactivation mechanism mediated by micrometric silicon nitride powder2025

    • Author(s)
      Pezzotti Giuseppe、Yasukochi Yoshiki、Ohgitani Eriko、Nakashio Maiko、Shin-Ya Masaharu、Adachi Tetsuya、Yamamoto Toshiro、Ikegami Saki、Zhu Wenliang、Higasa Koichiro、Okuma Kazu、Mazda Osam
    • Journal Title

      RSC Chemical Biology

      Volume: 6 Issue: 2 Pages: 182-208

    • DOI

      10.1039/d4cb00237g

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Anti-SARS-CoV-2 activity of microwave solvolysis lignin from woody biomass2024

    • Author(s)
      Okabe Yumi、Ohgitani Eriko、Mazda Osam、Watanabe Takashi
    • Journal Title

      International Journal of Biological Macromolecules

      Volume: 275 Pages: 133556-133556

    • DOI

      10.1016/j.ijbiomac.2024.133556

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Milk Casein Inhibits Effect of Black Tea Galloylated Theaflavins to Inactivate SARS-CoV-2 In Vitro2023

    • Author(s)
      Nakashio Maiko、Ohgitani Eriko、Shin-Ya Masaharu、Kawamoto Masaya、Ichitani Masaki、Kobayashi Makoto、Takihara Takanobu、Kinugasa Hitoshi、Ishikura Hiroyasu、Mazda Osam
    • Journal Title

      Bioengineering

      Volume: 10 Issue: 9 Pages: 1068-1068

    • DOI

      10.3390/bioengineering10091068

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of tea, catechins and catechin derivatives on Omicron subvariants of SARS-CoV-22023

    • Author(s)
      Shin-Ya Masaharu、Nakashio Maiko、Ohgitani Eriko、Suganami Akiko、Kawamoto Masaya、Ichitani Masaki、Kobayashi Makoto、Takihara Takanobu、Inaba Tohru、Nukui Yoko、Kinugasa Hitoshi、Ishikura Hiroyasu、Tamura Yutaka、Mazda Osam
    • Journal Title

      Scientific Reports

      Volume: 13 Issue: 1 Pages: 16577-16577

    • DOI

      10.1038/s41598-023-43563-3

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access

URL: 

Published: 2022-04-19   Modified: 2026-01-16  

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