ボンベシン受容体サブタイプ3は,肺がん細胞における反応性酸素種に依存した方法で,HER2チロシンリン酸化によって腫瘍の成長を調節する
Terry W Moody1, Irene Ramos-Alvarez2, Samuel A Mantey2
1National Cancer Institute, Center for Cancer Training, Bethesda, MD (TWM).
まとめ
肺がん細胞におけるボンベシン受容体サブタイプ3 (BRS-3) の活性化により,HER2のトランザクティベーションを活性化酸素種に依存した方法で調節することにより,腫瘍の成長が促進されます. HER2をターゲットにすることで,肺がんに対する新しい治療戦略が提供される可能性があります.
科学分野:
- 腫瘍学
- 分子生物学
- 薬理学について
背景:
- ボンベシン受容体サブタイプ-3 (BRS-3) は孤児Gタンパク質結合受容体である.
- 肺がん細胞におけるBRS-3の活性化は,ホスファティディル・イノシトールの周回と表皮成長因子受容体 (ErbB1) のリン酸化を刺激する.
- 肺がんにおけるErbB2/HER2のトランスアクティベーションにおけるBRS-3の役割は不明である.
研究 の 目的:
- BRS-3の活性化が肺がん細胞におけるErbB2/HER2をトランザクティベーションするかどうかを調査する.
- 肺がん細胞に対するBRS-3媒介作用に関与するシグナル伝達経路を解明する.
- 非小細胞肺がん (NSCLC) で BRS-3および/またはHER2を標的とする治療の可能性を調査する.
主な方法:
- BRS-3を発現する肺がん細胞系 (NCI-H727,NCI-H1299) を利用した.
- BRS-3アゴニスト (MK- 5046, BA1) とアンタゴニスト (Bantag- 1, ML- 18) の投与
- HER2/ERK2のチロシン酸化,活性酸素種 (ROS) の生成,細胞増殖/コロニー形成の評価
主要な成果:
- BRS-3アゴニスト (MK- 5046, BA1) は,肺がん細胞におけるHER2/ ERK2のリン酸化を増加させた.
- この効果はBRS-3アンタゴニスト (Bantag-1,ML-18) によって阻害された.
- N- アセチルシステインとティロンの抑制によって示されたように,MK- 5046によるHER2/ ERKのリン酸化はROSに依存していた.
- BRS-3の活性化により,ROSの産生が増加し,NSCLCのコロニー形成が促進され,抗体が増殖を抑制した.
結論:
- 肺がん細胞におけるBRS-3の活性化は,ROSに依存するメカニズムを通じてHER2の活性化を調節する.
- BRS-3信号はNSCLCの成長と増殖に寄与する.
- HER2を標的とし,他の薬剤と併用することで,肺がん治療の有望な治療法となる.
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