Integrin Proteins
Integrin Proteins - Related Videos
01:10
Integrins
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2023
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,...
01:15
Activation of Integrins
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2023
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.
09:14
Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Cited by 21 •
2014
Static adhesion assay is a powerful tool that can be used to model the interactions between T lymphocytes and other cell types. Interactions are generated by injecting labeled T cells into wells coated with adhesion molecules, while a plate reader is used to quantify the number of adherent cells following serial washes.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
04:15
A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs
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2024
This protocol describes a flow cytometry-based, high-throughput screening method to identify small-molecule drugs that inhibit β2 integrin activation on human neutrophils.
FAQs
The alpha and beta subunits work together to determine which ligands an integrin can recognize. This pairing gives different integrins distinct binding preferences within the extracellular environment, allowing cells to attach selectively to particular matrix components or neighboring cells. Subunit composition therefore influences where adhesion occurs and which downstream cellular responses can be initiated.
Integrin proteins transmit information in both directions across the cell membrane. Signals from inside the cell can alter the receptor's adhesion affinity, regulating how strongly the cell attaches. Conversely, ligand binding outside the cell can send signals inward to influence the cytoskeleton and other aspects of cell behavior. This two-way control lets adhesion respond dynamically to cellular conditions.
Mechanotransduction allows integrin-associated adhesions to connect physical interactions with cellular signaling. Forces experienced at the cell surface can be linked to the cytoskeleton, while signals through the receptor influence adhesion and cell organization. This coupling helps cells respond to their physical surroundings, making integrins relevant to tissue structure, migration, and changes in cell behavior.
During wound repair, integrin-mediated adhesion provides a controlled connection between moving cells and their surroundings. The receptors can regulate attachment through changes in adhesion affinity while signaling inward to organize the cytoskeleton. Coordinating these activities helps cells change position without losing environmental responsiveness, linking surface interactions to the broader process of tissue restoration.
Integrins coordinate several behaviors needed for biological organization, including adhesion, migration, proliferation, survival, and differentiation. These functions support developmental processes and help immune cells respond within tissues. Because the receptors connect external ligands with internal signaling, changes in integrin activity can influence both where cells move and how they adopt or maintain particular functional states.
Their involvement in tumor invasion, inflammation, and vascular function makes integrin proteins useful for examining how altered cell adhesion and signaling contribute to disease. Studying their ligand interactions, affinity regulation, and cytoskeletal signaling can connect molecular changes with tissue-level outcomes. These relationships also make integrins relevant to identifying potential therapeutic targets, as indicated by their broad disease-associated roles.