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Related Concept Videos

Integrins01:10

Integrins

4.6K
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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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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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...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Activation of Integrins01:15

Activation of Integrins

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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...
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Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

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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...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Related Experiment Video

Updated: Nov 4, 2025

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

Published on: June 13, 2014

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Integrin adhesion complexes.

Megan R Chastney1, James R W Conway1, Johanna Ivaska2

  • 1Turku Bioscience Center, University of Turku and Åbo Akademi University, FIN-20520 Turku, Finland.

Current Biology : CB
|May 25, 2021
PubMed
Summary
This summary is machine-generated.

Cell-tissue interactions, mediated by extracellular matrix (ECM) and adhesion receptors, are crucial for tissue architecture and function. This research explores the historical and conceptual framework of these interactions in development and tissue-specific functions.

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Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography
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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biophysics

Background:

  • Tissue architecture and function depend on cellular adhesion and signaling receptors interacting with the extracellular matrix (ECM).
  • The ECM integrates cellular systems, a concept established over a century ago in experimental embryology.
  • Early hypotheses proposed cell attachment to ECM via cytoplasmic filaments and electron-dense plaques.

Purpose of the Study:

  • To review the historical development of understanding cell-tissue interactions.
  • To highlight the foundational concepts of ECM's role in integrating cellular systems.
  • To discuss models of nuclear-ECM connections via cytoskeletal and transmembrane receptors.

Main Methods:

  • Historical literature review and conceptual analysis.
  • Synthesis of key findings from experimental embryology and cell biology.
  • Examination of proposed models for cell-ECM adhesion and tissue-specific function.

Main Results:

  • Cell-tissue interactions are fundamental to organogenesis.
  • The ECM acts as a critical integrator of cellular systems.
  • Models have evolved from cytoplasmic filaments to transmembrane receptors linking the nucleus to the ECM.

Conclusions:

  • Understanding cell-ECM interactions is essential for comprehending tissue architecture, function, and development.
  • The concept of a minimum unit linking the nucleus to the ECM via receptors provides a framework for tissue-specific functions.