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2013 Fiscal Year Final Research Report

Study of the agent targetting for ER stress-induced XBP1 activity in refractory lymphoid malignancies.

Research Project

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Project/Area Number 23791085
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Hematology
Research InstitutionNagoya City University

Principal Investigator

RI MASAKI  名古屋市立大学, 医学(系)研究科(研究院), 助教 (00567539)

Project Period (FY) 2011 – 2013
Keywords骨髄腫 / XBP1
Research Abstract

In this study, we identified toyocamycin, an adenosine analog, as an XBP1 inhibitor isolated from culture broth of an Actinomycete strain. Toyocamycin as well as other adenosine analogs suppressed XBP1 activation and induced apoptosis in ER-stressed tumor cells. In addition, toyocamycin inhibited the constitutive activation of XBP1 in MM cells, showed synergistic cytotoxic effects with bortezomib, and triggered dose-dependent apoptosis of MM cell lines as well as primary MM cells. Toyocamycin showed biological activities at the nanomolar level and mediated a growth inhibitory effect in an MM xenograft model similar to bortezomib. These results provide a rationale for initiating clinical trials using toyocamycin or other adenosine analogs, alone or in combination with bortezomib, for patients with MM refractory to immunomodulatory drugs and bortezomib. Also, toyocamycin could be a lead compound to further develop more specific inhibitors of the IRE1-XBP-1 pathway.

  • Research Products

    (2 results)

All 2013 2012

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] Identification of Toyocamycin, an agent cytotoxic for multiple myeloma cells, as a potent inhibitor of ER stress-induced XBP1 mRNA splicing2012

    • Author(s)
      Ri M, Iida S, et al. (他16名)
    • Journal Title

      Blood Cancer J

      Volume: 2;7 Pages: e79

    • DOI

      10.1038

    • Peer Reviewed
  • [Presentation] How to overcome acquired resistance against novel agents in multiple myeloma; Strategies based on the responsible mechanism for bortezomib resistance2013

    • Author(s)
      Masaki Ri, Shinsuke Iida
    • Organizer
      第10回日本臨床腫瘍学会学術集会
    • Place of Presentation
      大阪
    • Year and Date
      2013-07-26

URL: 

Published: 2015-06-25  

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