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Related Concept Videos

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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Activation of Integrins01:15

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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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Integrins01:10

Integrins

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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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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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What is Cell Signaling?02:03

What is Cell Signaling?

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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
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What is Cell Signaling?02:03

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Related Experiment Video

Updated: Apr 27, 2026

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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Cellular signaling by collagen-binding integrins.

Jyrki Heino1

  • 1Department of Biochemistry, University of Turku, 20014, Turku, Finland, jyrki.heino@utu.fi.

Advances in Experimental Medicine and Biology
|July 16, 2014
PubMed
Summary

The four collagen-binding integrins have distinct roles in cell adhesion and signaling. While α1β1 integrin promotes proliferation, α2β1 integrin inhibits growth, highlighting complex matrix interactions.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrins are cell adhesion receptors crucial for cell-matrix interactions.
  • The αI domain integrin subgroup, including α1β1, α2β1, α10β1, and α11β1, binds to collagen.
  • Signaling functions of α1β1 and α2β1 are well-studied, but less is known about α10β1 and α11β1.

Purpose of the Study:

  • To review and synthesize current knowledge on the signaling functions of collagen-binding αI domain integrins.
  • To highlight the contrasting cellular responses mediated by α1β1 and α2β1 integrins upon collagen binding.
  • To emphasize the influence of cell type, collagen matrix structure, and receptor crosstalk on integrin signaling.

Main Methods:

  • Literature review and synthesis of existing experimental data.

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Related Experiment Videos

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Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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Analysis of Cell Migration within a Three-dimensional Collagen Matrix
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  • Analysis of studies investigating integrin-collagen interactions and downstream signaling.
  • Focus on comparative analysis of α1β1 and α2β1 integrin functions.

    • Main Results:

    • α1β1 integrin typically promotes cell proliferation and suppresses collagen synthesis.
    • α2β1 integrin often inhibits cell growth and promotes collagen synthesis, demonstrating opposing functions to α1β1.
    • Cell-type specific factors and collagen matrix organization significantly modulate integrin signaling outcomes.

    Conclusions:

    • Collagen-binding integrins exhibit diverse and often opposing signaling roles.
    • Understanding these integrins requires consideration of cellular context, matrix architecture, and receptor crosstalk.
    • Further research into α10β1 and α11β1 integrins is needed to fully elucidate their functions.