STRADによるLKB1の活性化時に単一の腸上皮細胞の完全な偏化
Annette F Baas1, Jeroen Kuipers, Nicole N van der Wel
1Hubrecht Laboratory, Center for Biomedical Genetics, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands.
Cell
|March 16, 2004
まとめ
LKB1遺伝子についてです.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 癌の遺伝学 癌の遺伝学
背景:
- LKB1遺伝子はセリン/スレオニンキナーゼであり,ピュッツ・ジェガーズ癌症候群に関連しています.
- LKB1はモデル生物の極性遺伝子と同質性を共有しています.
- STRADはLKB1に特異的なアダプタータンパク質で,LKB1の局所化と活性を調節する.
研究 の 目的:
- 皮質細胞の極性定着におけるLKB1の役割を調査する.
- LKB1が,細胞と細胞の接触とは無関係に,腸内上皮細胞の極性を誘発できるかどうかを判断する.
主な方法:
- 誘導可能なSTRAD発現を持つ腸上皮細胞系を生成する.
- LKB1の活性化と顕微鏡を用いた細胞変化の観察.
- アクチン細胞骨格の改造とタンパク質の局所化の分析.
主要な成果:
- 誘導性STRADの活性化は,アクチン細胞骨格の急速な改造とブラシの境界形成につながった.
- 交差点タンパク質 (ZO-1,p120) は,細胞と細胞との接触なしに,周辺的に再分布する.
- アピカルおよびベースラテルマーカーは,膜領域に正しく局所されています.
結論:
- LKB1の活性化により,上皮細胞の完全な極性が生じる.
- 表皮細胞は,交差点の細胞と細胞の接触がない場合でも完全な極性を達成することができ,既存のモデルに挑戦します.
さらに関連する動画
関連する概念動画
Adult Stem Cells
Stem cells are undifferentiated cells that divide and produce more stem cells or progenitor cells that differentiate into mature, specialized cell types. All the cells in the body are generated from stem cells in the early embryo, but small populations of stem cells are also present in many adult tissues including the bone marrow, brain, skin, and gut. These adult stem cells typically produce the various cell types found in that tissue—to replace cells that are damaged or to continuously renew...
Renewal of Intestinal Stem Cells
The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the goblet,...
Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...


