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p53腫瘍抑制ネットワークのマイクロRNA成分である
Lin He1, Xingyue He, Lee P Lim
1Watson School of Biological Sciences, Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, New York 11724, USA.
Nature
|June 8, 2007
まとめ
マイクロRNA (miRNA) は腫瘍を抑制することができます. miRNAのmiR-34ファミリーは,p53腫瘍抑制タンパク質によって直接調節され,細胞サイクル停止を誘導し,がん細胞の増殖を抑制することができます.
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:
- マイクロRNA (miRNA) レベルが低下することは,ヒトの癌では一般的であり,腫瘍抑制における小さなRNAの役割を示唆しています.
- 腫瘍抑制タンパク質p53は,ストレスとDNA損傷に対する細胞反応の重要な調節剤です.
研究 の 目的:
- 腫瘍抑制経路のmiRNA成分を特定するために.
- p53状態とmiRNA発現の関係を調査する.
主な方法:
- 野生型とp53欠乏細胞のmiRNA発現プロフィールの比較.
- p53に関連したmiR-34a-cファミリー発現の分析.
- p53.3によってmiR-34ファミリーの遺伝子の調節を調査する.
- 細胞サイクル進行に対する子宮外のmiR-34発現の影響を評価する.
主要な成果:
- miRNAsの家族,miR-34a-cが特定され,その発現はp53状態と相関しています.
- miR-34ファミリーのmiRNAをコードする遺伝子は,p53.3の直接的な転写標的である.
- p53は,DNA損傷と腫瘍性ストレスへの反応としてmiR-34発現を誘発する.
- miR-34の子宮外発現は,細胞サイクル進行を促進する遺伝子をダウンレギュレーションすることによって,細胞サイクル停止を誘発する.
結論:
- miRNAsのmiR-34ファミリーはp53.3の直接の転写標的として機能する.
- miR-34は,細胞サイクル停止を誘導することによって,腫瘍抑制剤として作用します.
- miR-34は,他のp53-調節経路と連携して,腫瘍形成と制御不能の細胞増殖を抑制する可能性があります.
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