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Related Concept Videos

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...
Cytoskeletal Linker Proteins - Plakins01:09

Cytoskeletal Linker Proteins - Plakins

Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Cytoskeletal Accessory Proteins01:13

Cytoskeletal Accessory Proteins

The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...

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Related Experiment Video

Updated: May 10, 2026

Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
07:20

Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor

Published on: April 25, 2019

Job-splitting among integrins.

Ronen Zaidel-Bar

    Nature Cell Biology
    |June 4, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Different integrin receptors trigger distinct cell behaviors. Alpha-V (αV) integrins drive actin polymerization, while Beta-1 (β1) integrins induce contractility, with both sensing tissue rigidity.

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    Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
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    Published on: February 2, 2024

    Area of Science:

    • Cell biology
    • Molecular biology
    • Biochemistry

    Background:

    • Integrin receptors mediate cell adhesion and signal transduction.
    • Understanding how integrins for the same ligand elicit different cellular responses remains a challenge.

    Discussion:

    • Alpha-V (αV) and Beta-1 (β1) integrins, despite binding similar extracellular ligands, assemble distinct adhesomes.
    • αV integrin adhesomes promote unbranched actin polymerization.
    • β1 integrin adhesomes induce myosin-II-dependent cellular contractility.

    Key Insights:

    • Class-specific adhesomes dictate distinct downstream signaling pathways.
    • αV integrins activate actin polymerization, while β1 integrins activate contractility.
    • Both αV and β1 integrins function synergistically in sensing substrate rigidity.

    Outlook:

    • Further research into integrin adhesome composition can reveal mechanisms of differential signaling.
    • Targeting specific integrin pathways may offer new therapeutic strategies for diseases involving cell adhesion and migration.