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テロメラーゼRNAが欠けているマウス細胞によるテロメア短縮と腫瘍形成
M A Blasco1, H W Lee, M P Hande
1Cold Spring Harbor Laboratory, New York 11724, USA.
Cell
|October 23, 1997
まとめ
テロメラーゼはテロメアの長さを維持するために不可欠ですが,その欠如はマウスの細胞不死化や腫瘍形成を防ぐことはありません. この研究では,テロメラーゼを調査しました.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- がん研究 がん研究
背景:
- テロメラーゼは,テロメアの維持に関与する重要な酵素であり,細胞の老化と癌に不可欠です.
- テロメラーゼの役割は,正常な対腫瘍の成長におけるさらなる解明を必要とします.
研究 の 目的:
- テロメラーゼRNAコンポーネント (mTR) が正常および腫瘍の成長に必要かどうかを調査する.
- テロメラーゼの活性が細胞の不死化,腫瘍性変異,腫瘍の発達に不可欠であるかどうかを判断する.
主な方法:
- ネズミにおけるテロメラーゼRNA構成要素 (mTR) の生殖線の切除により,mTR-/- ネズミが生成される.
- テロメア長さ,染色体安定性,およびmTR-/-マウスの次世代における腫瘍形成の分析.
- テロメラーゼ欠乏細胞のインビトロ不死化および腫瘍性変異アッセイ.
主要な成果:
- mTR-/-マウスは6世代生存し,テロメアの漸進的な縮小 (一世代あたり4.8+/-2.4kb) を示した.
- テロメラーゼ欠乏細胞は,ウイルス腫瘍遺伝子によって不死化し,変形させることができる.
- 変形したテロメラーゼ欠乏細胞は,後の世代の染色体異常にもかかわらず,裸のマウスの腫瘍を形成しました.
結論:
- テロメラーゼはテロメアの長さを維持するために不可欠です.
- テロメラーゼの活動は,このマウスモデルにおいて,不死の細胞系,腫瘍性変異,または腫瘍形成を確立するための前提条件ではありません.
- この発見は,テロメアの維持と細胞の不死化と腫瘍発生のプロセスとの間の分離を強調しています.
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