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Strategy for prevention of Cytomegalovirus infection via breast milk in very low birth weight infants

Research Project

Project/Area Number 20K08217
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionShowa University

Principal Investigator

Mizuno Katsumi  昭和大学, 医学部, 教授 (80241032)

Co-Investigator(Kenkyū-buntansha) 幸田 力  昭和大学, 医学部, 准教授 (10365752)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsサイトメガロウイルス / 電子レンジ / 低温殺菌 / 分泌型IgA抗体 / ラクトフェリン / 超早産児 / 細胞感染 / 温度変化 / 母乳
Outline of Research at the Start

超早産児にとって母乳は疾病予防にもつながる薬としての役割もある。一方で母乳は母親がサイトメガロウイルス(CMV)既感染であると経母乳CMV感染のリスクとなる。基礎研究では電子レンジ(MW)処理により母乳中CMVは感染性を失うことがわかった。今回、MWによる経母乳CMV感染対策を検証する。母乳を電子レンジ500W 40秒後に与えられた児(介入群)と、従来式の冷凍解凍母乳を与えられた児(対照群)と比べて感染率が低下するのかを修正36週時点で尿中HCMVDNAをPCR法で判定する。感染がなくなればMWという一般的な方法で経母乳CMV感染が防ぐことができるため、世界規模で恩恵を被ることができる。

Outline of Final Research Achievements

In preterm infants, human milk(HM) is the best, but if the mother is CMVIgG(+), CMV infection can occur via HM, leading to hepatic dysfunction. Consequently, preventive measures have been considered for HM from CMVIgG(+) mothers. Holder pasteurization(HP) is standard method, but uncommon in Japan, therefore we considered microwave treatment(MT) as a candidate.CMV added into formula resulted in no cell infection after MT at 500W, 40s. Additionally, HM components in 100ml HM was not changed after MT 500W, 40s, thus posing no disadvantage to infants. Clinical studies were supposed to conduct, but due to COVID-19 pandemic, hindering the realization of these studies. Therefore, we kept in vitro experiment. In order to achieve a consistent temperature change(TC) regardless HM volume, we put HM in a 25ml bag and immersing it in 75ml of water provided a equivalent TC to 100ml HM. MT at 200W/500W 60s resulted in prevention of cell infection by HM from CMVIgG(+) mothers significantly.

Academic Significance and Societal Importance of the Research Achievements

超早産児において母乳は、単なる栄養ではなく薬としての効果もあるため、母乳育児が推奨される。一方、母親がCMV IgG陽性の場合、超早産児の6-37%で経母乳CMV感染が成立し、敗血症性ショックや肝機能障害を起こしうる。そのため、CMV IgG陽性母体の母乳に対して感染対策が検討されてきた。代表は62.5℃30分の低温殺菌であるが、日本で低温殺菌器は一般的ではない。どのNICUでも利用できる電子レンジを今回用いた。児の母乳量に関わらず一定の温度変化を得る方法が確立されたこと、500W20秒であれば母乳成分のロスはなく、かつ、有意に細胞感染を抑制できることから、広く臨床応用できる方法と考えられる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (6 results)

All 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Journal Article] 母乳バンクから提供されるドナーミルクの母乳成分分析に関する検討2022

    • Author(s)
      水野克己
    • Journal Title

      日本母乳哺育学会誌

      Volume: 16 Pages: 160-165

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Reliability of an Ion-Selective Electrode as a Simple Diagnostic Tool for Mastitis2022

    • Author(s)
      Furukawa K, Mizuno K, Azuma M, Yoshida Y, Den H, Iyoda M, Nagao S, Tsujimori Y
    • Journal Title

      Journal of Human Lactation

      Volume: - Issue: 2 Pages: 262-269

    • DOI

      10.1177/08903344221075050

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Microwave Heating of Human Milk With Direct Temperature Monitoring2021

    • Author(s)
      Yoshida Y, Azuma M, Furukawa K, Mizuno K, Den H, Kamiya T, Izumizaki M
    • Journal Title

      Journal of Human Lactation

      Volume: - Issue: 2 Pages: 608-611

    • DOI

      10.1177/08903344211047452

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 新生児・乳児期の母乳栄養について2022

    • Author(s)
      水野克己
    • Organizer
      第157回日本小児科学会栃木県地方会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 早産児と母乳栄養~現在・過去・未来~2022

    • Author(s)
      水野克己
    • Organizer
      第66回日本新生児成育医学会学術集会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Changes in breast milk properties due to microwave treatment2021

    • Author(s)
      Katsumi Mizuno
    • Organizer
      International Society for Research on Human Milk and Lactation
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2020-04-28   Modified: 2025-01-30  

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