Integrin Signaling
Integrin Signaling - 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.
08:51
Induction of Adhesion-dependent Signals Using Low-intensity Ultrasound
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Cited by 13 •
2012
This protocol describes the stimulation of cultured fibroblasts with low-intensity pulsed ultrasound, which drives focal adhesion formation and Rac1 activation by mimicking engagement of the transmembrane matrix receptor, syndecan-4. This approach allows investigation of a successful clinical technique at the cellular level, thereby providing opportunities for refinement of the therapy.
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.
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
Conformational switching changes whether an integrin can engage its extracellular ligand. Inactive and active states therefore provide a regulatory step before downstream signaling begins. This control allows cells to adjust adhesion-related responses according to receptor state and ligand availability, linking extracellular contact to intracellular regulation.
Adhesion-complex assembly brings integrins together after ligand engagement and creates a signaling platform. Within these complexes, focal adhesion kinase, Src-family kinases, and actin-associated proteins transmit biochemical signals and connect them with cytoskeletal organization. Their coordinated activity helps convert extracellular attachment into intracellular responses that influence cell behavior.
Mechanical cues from adhesion can be translated through integrin-associated complexes into intracellular signals, a process known as mechanotransduction. Actin-associated proteins participate in this transmission, allowing force-related information from the cell’s surroundings to affect signaling. This provides a mechanism for coordinating tissue organization and cell movement.
The signaling framework can be initiated by contact with the extracellular matrix or neighboring cells. This allows integrin pathways to couple environmental attachment or cell-cell interaction to intracellular regulation. In both settings, receptor activation, adhesion-complex organization, and kinase and actin-associated signaling connect external relationships with changes in movement, survival, proliferation, or differentiation.
Researchers examine integrin signaling to connect receptor-mediated adhesion with biological outcomes such as cell migration, survival, proliferation, differentiation, and tissue organization. These outcomes make the pathway relevant to development, wound healing, and immune-cell trafficking. Studying it can therefore reveal how cells coordinate behavior during normal biology.
Integrin signaling is relevant to cancer progression and to tissue-engineering research. The pathway also informs therapeutic targets, while its roles in adhesion, movement, survival, and mechanotransduction help frame questions about how tissues form, repair themselves, or respond to their physical surroundings. These connections make it valuable across both disease and regenerative biology.