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Development and Analysis of a Novel Agent of Ascochlorin(ASC) on Estrogen Receptors(ER)-Negative Breast Cancer

Research Project

Project/Area Number 15591352
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General surgery
Research InstitutionKyoto Prefectural University of Medicine

Principal Investigator

SAWAI Kiyoshi  Kyoto Prefectural University of Medicine, Department of Endocrine, Breast Surgery, Associate Professor, 医学研究科, 助教授 (80192102)

Co-Investigator(Kenkyū-buntansha) NAKAJIMA Hiroo  Kyoto Prefectural University of Medicine, Department of Endocrine, Breast Surgery, Lecturer, 医学研究科, 講師 (70275212)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2004: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordsascochlorin / breast cancer / apoptosis / AP-1 / Fra-1 / mitochondria / アポトーシス / エストロゲン感受性 / 抗癌剤抵抗性 / ヒト乳癌
Research Abstract

Although agents targeting estrogen receptors(ER) are the most effective in adjuvant therapy for human breast cancer expressing ER after surgery, breast cancer lacking ER are clinically serious, because they are highly malignant and exhibit resistance to the usual anti-cancer drugs, including ER-antagonists and DNA breaking agents. Apoptosis, on the other hand, can be induced by various stimuli such as the ligands of death receptors, chemotherapeutic drugs and irradiation. We found that the prenylphenol antibiotic ascochlorin(ASC) significantly induces typical apoptotic events in human breast cancer cells including cytochrome c release, activation of caspase-9, and -3, degradation of PARP and DNA fragmentation. In addition, we found that MX-1, a human breast cancer cell line lacking ER, exhibited higher AP-1 activity and expressed higher levels of c-Jun, c-Fos, and Fra-1 proteins as compared with ER-positive human breast cancer cell lines. When MX-1 or other human cell lines were treated with ASC, it dramatically suppressed the AP-1 activity of MX-1 cells, and selectively killed MX-1 cells as compared with ER-positive cells at more than 500nM. When examining the death mechanism of MX-1 cells, they exhibited typical apoptosis features. From these results, it is suggested that AP-1 is an effective clinical target molecule for the treatment of estrogen receptor negative human breast cancer.

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (2 results)

All 2005

All Journal Article (2 results)

  • [Journal Article] Selective cytotoxicity of ascochlorin in ER-negative human breast cancer cell lines.2005

    • Author(s)
      Sakaguchi, K., Nakajima, H., Mizuta, N., et al.
    • Journal Title

      Biochem Biophys Res Commun 329

      Pages: 46-50

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Selective cytotoxicity of ascochlorin in ER-negative human breast cancer cell lines.2005

    • Author(s)
      Sakaguchi, K, Nakajima, H., Mizuta, N., et al.
    • Journal Title

      Biochem Biophys Res Commun 329

      Pages: 46-50

    • Related Report
      2004 Annual Research Report

URL: 

Published: 2003-04-01   Modified: 2016-04-21  

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