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Elucidation of chemoresistance mechanism based on ER stress response in pancreatic cancer stroma

Research Project

Project/Area Number 21K15594
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 50020:Tumor diagnostics and therapeutics-related
Research InstitutionKyushu University

Principal Investigator

ENDO Sho  九州大学, 医学研究院, 共同研究員 (20801749)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords小胞体ストレス / UPR / 膵星細胞 / ERAP2 / 膵癌 / 癌微小環境 / PSC / ERストレス / 化学療法抵抗性 / 膵癌間質 / オートファジー / 治療抵抗性
Outline of Research at the Start

発癌から転移に至る過程の間、腫瘍組織に存在する細胞は、発癌遺伝子の活性化や代謝環境の変化など種々の内的及び外的ストレスにさらされている。この環境下で細胞では小胞体ストレスが過剰となり、Unfolded Protein Response(UPR)が活性化し,小胞体内腔に蓄積した異常タンパク質を折り畳むことで細胞死から防御する。ここでは、膵癌間質中でUPR活性の高い膵星細胞が、膵癌の化学療法抵抗性に関与していると仮説を立てた。この機序の解明により、小胞体ストレス経路を標的とした治療との併用が依然停滞を続ける化学療法奏功率の改善につながると考えられる。

Outline of Final Research Achievements

Gene expression analysis of PSCs established from human pancreatic cancer tissue (activated PSCs) and PSCs established from non-pancreatic cancer tissue (non-activated PSCs) revealed that the expression endoplasmic reticulum (ER)-related genes was significantly higher in activated PSCs than non-activated PSCs. Therefore, we targeted ERAP2, an ER-related gene, in PSCs and found that activation of PSCs was suppressed via inhibition of ER stress response. Furthermore, treatment experiments using mouse models suggested that suppression of ERAP2 in PSCs leads to tumor shrinkage and increased sensitivity to anticancer drugs.

Academic Significance and Societal Importance of the Research Achievements

膵癌において間質標的治療の有望性を示唆する報告は多数あるが、実臨床に向けての治療法はまだ確立されていない。これまでの報告の多くが癌細胞のストレス応答に関与するものであったが、本研究では膵癌に特徴的な豊富な間質細胞における小胞体ストレス反応経路が膵癌の進展や既存治療に対する抵抗性に寄与することを明らかにした点で学術的意義は大きい。また、膵癌における間質標的治療の新たなターゲットとしてERAP2を同定したことで、今後の膵癌新規治療法の開発の一助となる可能性もあり、新規治療法の開発が急務である膵癌治療において、本研究の果たす社会的意義も大きい。

Report

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

    (4 results)

All 2022

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

  • [Journal Article] ERAP2 is a novel target involved in autophagy and activation of pancreatic stellate cells via UPR signaling pathway2022

    • Author(s)
      Guan Weiyu、Nakata Kohei、Sagara Akiko、Iwamoto Chika、Endo Sho、Matsuda Ryota、Matsumoto Sokichi、Ikenaga Naoki、Shindo Koji、Moriyama Taiki、Onishi Hideya、Ohuchida Kenoki、Oda Yoshinao、Nakamura Masafumi
    • Journal Title

      Pancreatology

      Volume: 22 Issue: 1 Pages: 9-19

    • DOI

      10.1016/j.pan.2021.09.012

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] The functions of TAK1+CAF in pancreatic cancer microenvironment2022

    • Author(s)
      Sheng Nan, Koji Shindo, Kenoki Ohuchida, Tomohiko Shinkawa, Taiki Moriyama, Naoki Ikenaga, Kohei Nakata, Masafumi Nakamura
    • Organizer
      JDDW2022(第30回日本消化器関連学会週間)
    • Related Report
      2022 Annual Research Report
  • [Presentation] Investigation of the mechanism of PSC activation and development of high-throughput drug screening detecting compounds targeting PSC2022

    • Author(s)
      Kohei Nakata, Toshiya Abe, Noboru Ideno, Naoki Ikenaga, Yusuke Mizuuchi, Kenoki Ohuchida, Masafumi Nakamura
    • Organizer
      第53回日本膵臓学会大会・第26回国際膵臓学会(IAP・JPS2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Single-cell RNA sequence-based evaluation of the mechanism of CAF-related chemo-resistance of PDAC2022

    • Author(s)
      Yuki Mochida, Kenoki Ohuchida, Nobuhiro Torata, Tomohiko Shinkawa, Toshiya Abe, Noboru Ideno, Naoki Ikenaga, Kohei Nakata, Masafumi Nakamura
    • Organizer
      第53回日本膵臓学会大会・第26回国際膵臓学会(IAP・JPS2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2024-01-30  

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