定義された遺伝的要素を持つヒト腫瘍細胞の作成
W C Hahn1, C M Counter, A S Lundberg
1Department of Biology, Massachusetts Institute of Technology, Whitehead Institute for Biomedical Research, Cambridge 02142, USA.
Nature
|August 10, 1999
まとめ
人間の腫瘍細胞を作り出すことは,大変な課題です. 科学者は,テロメラーゼ (hTERT) と2つの腫瘍遺伝子を組み合わせることで,正常なヒト細胞を腫瘍発生細胞に直接変換し,がん発症に関する新しい洞察を提供することを発見しました.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
背景:
- 悪性変異は,正常な細胞の増殖制御を覆す遺伝子変異を伴う.
- ネズミの細胞は腫瘍遺伝子の作用で容易に変異するが,ヒトの細胞は腫瘍遺伝的変異に抵抗する.
- これまでのヒト腫瘍細胞の作成には,不死化剤やウイルスゲノムが必要でした.
研究 の 目的:
- 正常なヒト細胞の直接腫瘍発生的変換のための新しい方法を調査する.
- 特定の腫瘍遺伝子とテロメラーゼがヒトの腫瘍形成を誘発できるかどうかを判断する.
- ヒトとネズミの細胞変換の根本的な違いを明らかにする.
主な方法:
- テロメラーゼ触媒サブユニット (hTERT) のエクトピック表現.
- シミアンウイルス40大Tオンコタンパク質と腫瘍発生性H-rasアレルとの共発現.
- ヒトの正常な表皮細胞と線維芽細胞を用いて.
主要な成果:
- 人間の細胞の直接腫瘍発生性変換が達成されました.
- hTERT,大Tオンコタンパク質,および腫瘍性H-rasの組み合わせが有効でした.
- このアプローチは,化学/物理的作用剤や自発的な不死の必要性を回避します.
結論:
- 大型T,腫瘍性RAS,テロメラーゼによって調節される経路の破壊は,ヒト腫瘍細胞の生成に十分である.
- 人間とネズミの細胞変容メカニズムにおける重要な違いを強調する.
- 人間の腫瘍発生を研究するための新しいモデルを提供する.
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