臓のホメオスタシスとがん発生におけるアキナー細胞のクローン拡張
Patrick Neuhöfer1,2,3, Caitlin M Roake1,2,3, Stewart J Kim1,2,3
1Stanford Cancer Institute, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|September 16, 2021
まとめ
高レベルのテロメラーゼ逆転写酶 (TERT) を発現する希少な臓細胞は臓がんの発症を誘発する. これらの高TERT細胞は,変異すると,がん前病変を形成し,臓管内腺がん (PDAC) の発達に関する新しい洞察を提供します.
科学分野:
- 細胞生物学
- 癌の研究
- 胃腸内科
背景:
- 臓管内腺癌 (PDAC) は,世界的な主要な癌殺虫剤です.
- 臓の細胞再生とPDACの開始のメカニズムは完全に理解されていません.
- 癌の幹細胞は多くの癌の腫瘍発現に関与しています
研究 の 目的:
- 臓の再生とPDACの開始に 責任を負う細胞タイプを特定する.
- 臓腫瘍形成における特定の細胞サブ集団の役割を調査する.
- PDAC の初期開発に伴うシグナル伝達経路を解明する.
主な方法:
- ネズミのモデルにおける内生テロメラーゼ逆転写酵素 (Tert) 局所を用いた系統追跡.
- ホメオスタシス中のアシナ細胞集団と腫瘍学的変異に対する反応の分析.
- 切除されたヒト臓腫瘍におけるフォスフォ- ERKとKRAS変異の検出
主要な成果:
- TERT陽性胞細胞 (TERThigh) の希少なサブ集団が特定されました.
- TERT高アシナ細胞は,ホメオスタシス中に臓を更新し,拡大するクローンを形成します.
- 変異したKrasがTERThighアシナ細胞で発現すると,クローン形成が加速し,Ras-MAPK/ERKシグナル伝達により,前侵襲性病変への変異が誘発される.
- KRAS変異を持つフォスフォ- ERK陽性アシナ細胞の焦点は,ヒトの臓腫瘍に多く見られ,早期の前駆体病変を示唆する.
結論:
- 希少なTERT高いアシナ細胞は,臓の再生とPDACの開始において重要な役割を果たします.
- TERT高アシナ細胞におけるKRAS変異の維持は,アシナ細胞の膨張を促し,腫瘍発生を誘発する.
- TERT高いアシナ細胞は,臓がんの潜在的な細胞起源を表しています.
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