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関連する概念動画

Activation of Integrins01:15

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."
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.
Integrins01:10

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,...
Intracellular Signaling Affects Focal Adhesions01:17

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...
Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
Cell-matrix's Response to Mechanical Forces01:13

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...

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関連する実験動画

Updated: Jun 26, 2026

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
07:55

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads

Published on: March 8, 2017

機械的に活性化されたインテグリンスイッチは,α5β1機能の制御をします.

Julie C Friedland1, Mark H Lee, David Boettiger

  • 1Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Science (New York, N.Y.)
|January 31, 2009
PubMed
まとめ

細胞骨格力や細胞外マトリックス硬さを含む細胞の力学的力は,アルファ (5) ベータ (1) インテグリン機能を調節する. このインテグリンスイッチは,細胞の粘着,運動,シグナル伝達を制御し,組織発育と癌の進行に影響を与えます.

科学分野:

  • 細胞生物学 細胞生物学
  • バイオフィジックス 生物物理学
  • バイオケミストリー バイオケミストリー

背景:

  • 発達やホメオスタシスなどの細胞機能は,細胞骨格,インテグリン結合,および基板の硬さに依存しています.
  • これらの機械的要因と細胞の化学信号伝達経路の相互作用は,まだ十分に理解されていません.
  • これらの機械的要素の調節不全は,がんにおいて頻繁に観察される.

研究 の 目的:

  • 機械力とインテグリン媒介シグナル伝達との関連を調査する.
  • 細胞骨格力と細胞外マトリックス硬さがアルファ (((5)) ベータ (((1) インテグリンにどのように影響するか解明する.
  • このインテグリンスイッチが細胞の結合,運動,信号伝達における役割を決定する.

主な方法:

  • ミオシンIIによって生成される細胞骨格力に関する研究を活用した.
  • 細胞外マトリックス硬さのインテグリン状態への影響を調査した.
  • 合成部位を含む,フィブロネクチンとインテグリンの相互作用を分析した.
  • 焦点粘着キナーゼ (FAK) リン酸化の役割を評価した.

主要な成果:

  • アルファ ((5) ベータ ((1)) インテグリンがリラックス状態と緊張状態の間の移行を,ミオシンIIによって生成される細胞骨格力によって引き起こします.

さらに関連する動画

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs
04:15

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs

Published on: February 2, 2024

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

関連する実験動画

Last Updated: Jun 26, 2026

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
07:55

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads

Published on: March 8, 2017

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs
04:15

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs

Published on: February 2, 2024

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

  • 細胞骨格と細胞外マトリックスからの結合した力により,インテグリンスイッチが起動します.
  • このスイッチは,フィブロネクチンのシナジーサイトを活性化することによって,α(5) ベータ(1) - フィブロネクチンの結合強さを調節します.
  • インテグリンスイッチは,焦点粘着キナーゼリン酸化による信号の開始に不可欠です.

    • 結論:

    • 新しいメカニズムは,機械的な力を結合し,信号伝達経路を統合する.
    • アルファ ((5) ベータ ((1)) インテグリンスイッチは,機械的なシグナルと細胞応答の間の重要な仲介者として機能します.
    • この発見は,正常な生理学と癌のような疾患状態の両方で,組織力学,細胞粘着,運動性,シグナル伝達を理解するための意味を持っています.