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Induction of Adhesion-dependent Signals Using Low-intensity Ultrasound
Published on: May 8, 2012
インテグリン活性化と細胞骨格の相互作用は,線維ネクチンマトリックスの組み立てに不可欠です
C Wu1, V M Keivens, T E O'Toole
1Department of Biochemistry and Molecular Biology Mayo Clinic Scottsdale, Arizona 85239, USA.
Cell
|December 1, 1995
まとめ
フィブロネクチンマトリックス形成には,活性化されたインテグリンと特定の結合後の細胞イベントが必要です. この研究は,発育と治癒に不可欠なフィブロネクチン (Fn) アセンブリの鍵となるルールを定義しています.
科学分野:
- 細胞生物学 細胞生物学
- バイオケミストリー バイオケミストリー
- インテグリン・シグナリング
背景:
- フィブロネクチン (Fn) マトリクスは,脊椎動物の発達,傷の治癒,腫瘍発生に不可欠です.
- Fnマトリックスアセンブリのメカニズムを理解することは,治療的介入にとって非常に重要です.
研究 の 目的:
- インテグリン誘発フィブロネクチンマトリックス形成のルールを定義する.
- Fnフィブリロゲネシスにおけるインテグリン活性化状態と結合後のイベントの役割を明らかにする.
主な方法:
- Fnマトリックスアセンブリを研究するために,再結合Fn結合インテグリン,アルファIIbβ3を使用しました.
- Fn結合の必要性,インテグリンサブユニット・サイトプラズマドメイン,アクチン細胞骨格の整合性を調査した.
主要な成果:
- 多数のFn結合インテグリンは,マトリックスアセンブリをサポートし,活性化状態が線維生殖を制御します.
- 活性化されたインテグリンを持つ細胞へのFn結合は必要ですが,不十分です;インテグリンβサブユニットの細胞プラズマ領域を含むポストオクパンスイベントが必要です.
- これらのポストオクパネシーイベントは,無傷のアクチン細胞骨格に依存しています.
結論:
- 前回のパラドックスを解消し,Fn線維生成にインテグリンが関与するモデルを提案した.
- 病気の文脈でFnマトリックスアセンブリを制御するための新しい治療標的を特定しました.
関連する概念動画
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Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
Integrins
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
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Activation of Integrins
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
Cell-matrix's Response to Mechanical Forces
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...

