| Project/Area Number |
17K09649
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Respiratory organ internal medicine
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | EGFR変異 / 非小細胞肺癌 / アポトーシス / Osimertinib / HDAC阻害薬 / EGFR変異肺がん / BIM遺伝子多型 / HDAC3 / 癌 / トランスレーショナルリサーチ |
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| Outline of Final Research Achievements |
The BIM deletion polymorphism is associated with apoptosis resistance to EGFR-TKIs, such as gefitinib, in NSCLC harboring EGFR mutations. Here, we investigated whether the BIM deletion polymorphism contributes to resistance against osimertinib, a mutant selective EGFR-TKI.
EGFR-mutated NSCLC cell lines with the BIM deletion polymorphism exhibited apoptosis resistance to osimertinib and this resistance was overcome by combined use with vorinostat in vitro and in vivo. Experiments with homozygous BIM deletion-positive EGFR-mutated NSCLC cells revealed that vorinostat increased the expression of active BIM protein and induced apoptosis in osimertinib-treated cells. These effects were mediated predominantly by HDAC3 inhibition. These findings indicate the importance of developing HDAC3-selective inhibitors, and their combined use with osimertinib, for treating EGFR-mutated lung cancers carrying the BIM deletion polymorphism.
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| Academic Significance and Societal Importance of the Research Achievements |
BIM遺伝子多型は少量の血液で解析が可能で、患者への侵襲が少なく、簡便かつ正確に解析することができるため、薬剤耐性のバイオマーカーとして非常に有望である。本研究により、EGFR変異肺癌の標準治療であるOsimertinibの耐性にもBIM遺伝子多型が影響しており、HDAC阻害薬であるVorinostat併用治療が有効であることが示唆された。今後、BIM遺伝子多型をバイオマーカーとしたHDAC阻害薬併用治療の臨床開発が進むことが期待される。
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