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Investigation of the new treatment for castration-resistant prostate cancer targeting AR-splice variants

Research Project

Project/Area Number 16K20156
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Urology
Research InstitutionOsaka City University

Principal Investigator

KATO MINORU  大阪市立大学, 大学院医学研究科, 病院講師 (30711684)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords去勢抵抗性前立腺癌 / ARスプライスバリアント / ドセタキセル / 去勢抵抗性前立腺がん / STAT3 / ドセタキセル抵抗性 / 前立腺がん / アンドロゲン受容体
Outline of Final Research Achievements

We developed docetacel-resistant LNCaP95-DR cells. Western blot and real-time PCR analysis showed the increase of the expression levels of AR-V7 and its down-regulated molecules. Cross-resistance to cabazitaxel was also seen in LNCaP95-DR, however, knock-down of AR-V7 did not affect the sensitivity of docetaxel or cabazitaxel in LNCaP95-DR, indicating that there is no significant relevance between taxane sensitivity and AR-V7. Finally, AR-NTD antagonist, EPI compound, suppressed the proliferation of LNCaP95-DR to the same extent of that in parental LNCaP95.

Academic Significance and Societal Importance of the Research Achievements

これまでCRPCの最終薬剤として使用されてきたタキサン系抗癌剤とAR-V7の間には薬剤感受性の面において関連があるとした報告や、その反面関連はないとする報告が散見され、AR-V7発現の意義に関しては議論が分かれていたが、今回の研究結果により、AR-V7の発現はタキサン感受性と関連を認めず、さらにAR-V7を標的とした薬剤はドセタキセル耐性となった後でも一定の治療効果を有する可能性があることを示すことができた。今回の発見が実臨床の去勢抵抗性前立腺がん治療において一定の影響を及ぼすことが期待される。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (4 results)

All 2019 2018 2016

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

  • [Journal Article] Androgen Receptor Splice Variant 7 Drives the Growth of Castration Resistant Prostate Cancer without Being Involved in the Efficacy of Taxane Chemotherapy.2018

    • Author(s)
      Shimizu Y, Tamada S, Kato M, Hirayama Y, Takeyama Y, Iguchi T, Sadar MD, Nakatani T
    • Journal Title

      Journal of Clinical Medicine

      Volume: 7 Issue: 11 Pages: 1-14

    • DOI

      10.3390/jcm7110444

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Targeting Androgen Receptor Activation Function-1 with EPI to Overcome Resistance Mechanisms in Castration-Resistant Prostate Cancer2016

    • Author(s)
      Yang YC, Banuelos CA, Mawji NR, Wang J, Kato M, et al.
    • Journal Title

      clinical cancer research

      Volume: 22 Issue: 17 Pages: 4466-4477

    • DOI

      10.1158/1078-0432.ccr-15-2901

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] ABCB1およびアンドロゲン受容体N末端を標的とした、ドセタキセル耐性CRPCに対する治療戦略2019

    • Author(s)
      清水 保臣、加藤 実、武山 祐士、仲谷 達也
    • Organizer
      第28回 泌尿器科分子・細胞研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] The effect of androgen receptor splice variant 7 on the growth of castration-resistant prostate cancer and the efficacy of taxane chemotherapy2019

    • Author(s)
      Yasuomi Shimizu, Minoru Kato, Tatsuya Nakatani
    • Organizer
      ASCO-GU
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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