不十分なDNA損傷修復は乳腺変異を促進し,BRCA1乳がんにつながる
Hua Wang1, Dongxi Xiang2, Ben Liu1
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Departments of Genetics and Medicine, Harvard Medical School, Boston, MA 02115, USA.
Cell
|June 29, 2019
まとめ
BRCA1機能の喪失は,DNAの損傷と細胞の変異を引き起こし,基礎的な乳がんにつながる. この研究は,修復されていないDNAの損傷が乳頭上皮細胞 (MEC) の悪性変異をどのように誘導するかを明らかにしています.
科学分野:
- 腫瘍学
- 分子生物学
- 遺伝学
背景:
- BRCA1 p220機能の喪失は基礎性乳がん (BLBC) と関連しているが,そのメカニズムは不明である.
- BRCA1はDNA修復と分化制御のために乳頭上皮細胞 (MEC) でNUMBとHES1と連携する.
- 修復されていないDNA損傷は,MECのメゼンキマ状態へのトランスディフェリエンテーションを誘導する可能性があります.
研究 の 目的:
- BRCA1の喪失が 乳がんの基礎型を 誘発するメカニズムを解明するためです
- BRCA1欠乏性乳がんにおけるDNA損傷と変異の役割を調査する.
- BRCA1関連BLBCにおける正常なMECから腫瘍細胞への細胞進化を理解する.
主な方法:
- 乳腺上皮細胞 (MEC) のBRCA1,NUMB,HES1の機能を研究した.
- ネズミのMECで化学的に誘発されたクロスリンク (ICL) 損傷.
- 腫瘍発達の過程で細胞の進化を追跡するために in vivo 単細胞分析を行った.
主要な成果:
- BRCA1,NUMB,またはHES1の喪失,またはICLの損傷が誘発され,マウンのMECでは持続的なDNA損傷と光線から基礎/メゼンキマへの変異を引き起こします.
- In vivo単細胞分析では,BRCA1 BLBC発達の過程で,正常な光線MECから基礎/メゼンキマ腫瘍細胞への時間依存の進行が示された.
- BRCA1欠乏性のネズミのモデルにおける悪性変異と相関するDNA損傷の増加.
結論:
- 持続的なDNA損傷とその後の変異は,BRCA1に関連した基礎性乳がんにおける重要なメカニズムである.
- BRCA1は,MECにおけるゲノム安定性と正常な細胞分化を維持する上で重要な役割を果たします.
- これらの経路を理解すると,BLBC治療の潜在的な標的となる.
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