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Functional analysis of the role of MyD88 in multiple myeloma

Research Project

Project/Area Number 20K22819
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0901:Oncology and related fields
Research InstitutionSapporo Medical University

Principal Investigator

Nakamura Hajime  札幌医科大学, 医学部, 研究員 (10792666)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords多発性骨髄腫 / ST2825 / MyD88
Outline of Research at the Start

MyD88(Myeloid differentiation primary response gene 88)はNF-kBシグナル伝達経路関連因子をコードする遺伝子で、MyD88に変異が生じるとNF-kB経路が恒常的に活性化され、リンパ増殖疾患を発症すると考えられている。しかしながら多発性骨髄腫(MM)においてMyD88が、MMの病態生理に与える影響は不明である。近年、多くの新規MM治療薬が臨床導入されているが、再発難治例は未だ予後不良であり、治癒を期待できる治療薬の開発が急務である。そこで今回、治療ターゲットとしての可能性を念頭に、MyD88のMM細胞における機能を解析することとした。

Outline of Final Research Achievements

Myeloid differentiation factor 88 (MyD88), which is a key regulator of nuclear factor kappa B (NF-κB), plays an important role in tumorigenesis in lymphoid malignancies such as Waldenstrom’s macroglobulinemia (WM). However, its biological function in multiple myeloma (MM), which is a malignant plasma cell disorder like WM, remains unexplored.
We first demonstrated that higher expression MyD88 was significantly correlated with poor survival in patients with MM. Interestingly, bioinformatic analysis also revealed that MyD88 gene alteration, which is recognized in nearly 80% of patients with WM, was extremely rare in MM. In addition, ST2825 suppressed cell growth followed by apoptosis. Furthermore, ST2825 induced intracellular reactive oxygen species (ROS) in MM cells, and N-acetyl-L-cysteine, which is known as a ROS scavenger, significantly decreased the number of apoptotic MM cells evoked by ST2825 treatment. In summary, this study provides novel treatment strategies to conquer MM.

Academic Significance and Societal Importance of the Research Achievements

本研究ではこれまで報告のないMMにおけるMyD88の機能解析を行い、細胞増殖や転移浸潤に及ぼす影響を明らかにし、最終的に新規のMM治療戦略の開発を目指した。その結果として、MyD88及びその阻害剤であるST2825がMMの新規治療戦略に繋がる可能性を示した。様々な新規治療薬の開発を以てしても未だ治癒の難しい再発難治性MM患者の予後改善に寄与することが期待され、将来的にその他の癌腫への応用も考慮され、本研究が社会へ波及する効果は大きいと考えられた。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report

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Published: 2020-09-29   Modified: 2024-01-30  

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