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Development of vaccine therapy for achieving HBsAg loss in chronic hepatitis B

Research Project

Project/Area Number 21K07983
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionEhime University

Principal Investigator

YOSHIDA Osamu  愛媛大学, 医学部附属病院, 講師 (70746809)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsHBV / 治療ワクチン / B型肝炎 / HBx抗原
Outline of Research at the Start

HBs抗原とHBc抗原を含む経鼻治療ワクチン(NASVAC)に、無細胞蛋白合成技術で合成されたHBx抗原を付加し、NASVAC-Xを作成する。HBVトランスジェニックマウスにNASVAC-Xを投与し、HBx抗原付加によるHBV特異的免疫の増強効果(HBs抗体、HBc抗原特異的CTL、HBx抗体)、抗ウイルス効果(HBs抗原低下、HBV-DNA低下)の向上、HBx抗原付加による抗腫瘍効果を明らかにする。

Outline of Final Research Achievements

HBV therapeutic vaccine containing HBsAg and HBcAg was administrated to HBV transgenic mouse, model of HBV asymptomatic carrier. Total 5 doses of the therapeutic vaccine were injected through nose every 2 weeks. After 5 doses injection, all the HBV-Tg (n=5) obtained anti-HBs (404.8±172.3 mIU/mL). 40% (n=2/5) of HBV-Tg lost HBsAg after the 5 doses injection, the mean HBsAg was reduced to 2.2±3.9% compared with the baseline. HBsAg/HBcAg specific CTLs were detected in the spleen after the therapeutic vaccine injection. HBxAg was added to improve the immunogenicity of the therapeutic vaccine, however HBxAg did not amplify the anti-HBs induction and HBsAg reduction in HBVTg mouse.

Academic Significance and Societal Importance of the Research Achievements

HBV治療にはIFNと核酸アナログが用いられるが、副作用、長期服用、治療対象者の選別などの問題点がある。HBV排除にはHBV特異的なHBV応答が重要であり、治療ワクチンは新たな治療法となりうる。HBs抗原とHBc抗原を含む治療ワクチンの効果を確認したが、更なる治療効果(HBs抗原の低下、消失)が望まれる。本研究プロジェクトでは、マウスの経鼻投与法とHBV特異的な免疫応答(液性、細胞性)の解析方法を確立した。さらに、HBx抗原添加による治療増強効果を期待したが、治療効果の増強は確認できなかった。今後、抗原量、投与法などのプロトコールを改良し、治療ワクチンの改良を行う。

Report

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

    (6 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Intranasal therapeutic vaccine containing HBsAg and HBcAg for patients with chronic hepatitis B; 18?months follow‐up results of phase IIa clinical study2022

    • Author(s)
      Yoshida Osamu、Akbar Sheikh Mohammad Fazle、Imai Yusuke、Sanada Takahiro、Tsukiyama‐Kohara Kyoko、Miyazaki Takashi、Kamishita Taizou、Miyake Teruki、Tokumoto Yoshio、Hikita Hayato、Tsuge Masataka、Shimizu Masahito、Al Mahtab Mamun、Aguilar Julio Cesar、Guillen Gerardo、Kohara Michinori、Hiasa Yoichi
    • Journal Title

      Hepatology Research

      Volume: 53 Issue: 3 Pages: 196-207

    • DOI

      10.1111/hepr.13851

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] HBVキャリアに対するHBs抗原とHBc抗原を含む経鼻治療ワクチン(CVP-NASVAC)再投与の24か月の効果の検討2023

    • Author(s)
      吉田理、今井祐輔、日浅陽一
    • Organizer
      第45回日本肝臓学会西部肝
    • Related Report
      2023 Annual Research Report
  • [Presentation] HBs抗原とHBc抗原を含む経鼻治療ワクチン(CVP-NASVAC)の再投与によるHBs抗体のブースト効果とHBs抗原低下作用2022

    • Author(s)
      吉田理、白石佳奈、日浅陽一
    • Organizer
      第30回 日本消化器関連学会週間
    • Related Report
      2022 Research-status Report
  • [Presentation] HBsAg reduction by re-treatment of nasal administrative therapeutic vaccine containing HBsAg/HBcAg in chronic HBV infected patients2022

    • Author(s)
      Osamu Yoshida, Kana Shiraishi, Takahiro Sanada, Michinori Kohara, Kyoko Tsukiyama-Kohara, Takashi Miyzaki, Taizo Kamishita, Mamun Al Mahtab, Julio Cesar Aguilar, Gerardo Guillen, Yoshio Tokumoto, Sheikh Mohamed Fazle Akbar, Yoichi Hiasa
    • Organizer
      AASLD The Liver Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] HBsAg reduction was evident in 30 months follow-up after administration with therapeutic vaccine containing HBs/HBc antigen in chronic HBV carriers2021

    • Author(s)
      Osamu Yoshida, Kana Shiraishi, Yoichi Hiasa
    • Organizer
      第29回 日本消化器関連学会週間
    • Related Report
      2021 Research-status Report
  • [Presentation] Long term HBsAg reduction by a nasal administrative therapeutic vaccine containing HBsAg and HBcAg mixed with mucoadhesive CVP (CVP-NASVAC) in patients with chronic HBV infection: The results of 30 months follow up2021

    • Author(s)
      Osamu Yoshida, Yusuke Imai, Kana Shiraishi, Takahiro Sanada, Michinori Kohara, Kyoko Tsukiyama-Kohara, Takashi Miyzaki, Taizo Kamishita, Mamun Al Mahtab, Julio Cesar Aguilar, Gerardo Guillen, Yoshio Tokumoto, Sheikh Mohamed Fazle Akbar, Yoichi Hiasa
    • Organizer
      AASLD The Liver Meeting 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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