腸内表 epithelial 再生におけるmiR-143/145のための不可欠なメゼンキマ機能
Raghu R Chivukula1, Guanglu Shi2, Asha Acharya2
1Medical Scientist Training Program, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Cell
|May 27, 2014
まとめ
マイクロRNAs miR-143/145は,腸の修復に不可欠であり,メゼンキマ細胞で機能し,直接上皮腫瘍抑制に作用しません. 欠乏すると,滑らかな筋肉とミオフィブロブラストに影響を与え,傷の治癒を妨げます.
科学分野:
- 分子生物学は分子生物学である.
- 胃腸内科 胃腸内科
- 腫瘍学 腫瘍学
背景:
- miR-143/145マイクロRNA (miRNA) クラスタは,大腸がんではしばしばダウンレギュレーションされる.
- miR-143/145の過剰発現は腫瘍形成を阻害し,腫瘍抑制作用を示唆している.
- 以前の研究では,上皮組織におけるこれらのmiRNAsの細胞自律的な機能が示されました.
研究 の 目的:
- 腸の生理学と疾患におけるmiR-143/145クラスターのインビボ機能を調査する.
- 腸内の miR-143/145 機能に責任のある細胞区画を決定する.
- miR-143/145が表皮再生と腫瘍発生に影響を与えるメカニズムを解明する.
主な方法:
- miR-143/145 miRNAクラスタを標的として削除したマウスの生成.
- ノックアウトマウスの損傷後の腸の発達と上皮の再生の評価.
- 異なる腸区間のmiRNA発現パターンと標的遺伝子調節の分析.
- 滑らかな筋肉とミオフィブロブラストの機能の調査と,上皮の修復への影響.
主要な成果:
- miR-143/145欠乏したマウスの腸の発達は正常であった.
- 傷害後の上皮再生は,miR-143/145.5の不在で著しく低下しました.
- miR-143/145は,メゼンキマ区間 (滑らかな筋肉とミオフィブロブラスト) でのみ発現し,機能する.
- 再生機能の障害は,滑らかな筋肉とミオフィブロブラストの機能不全によるもので,標的遺伝子のIgfbp5の減圧とIGF信号伝達の変化に関連している.
結論:
- miR-143/145は,腸内皮質の創傷治癒に不可欠であり,メゼンキマ細胞を通して作用します.
- これらの発見は,結腸がんにおける細胞自律の上皮腫瘍抑制剤としてのmiR-143/145の確立された見解に異議を唱える.
- この研究は,腸内修復の調節におけるメゼンキマ・エピテリア相互作用の重要な役割を強調しています.
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