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Related Concept Videos

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,...
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.
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...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

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Related Experiment Video

Updated: May 20, 2026

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs
04:15

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs

Published on: February 2, 2024

Negative regulators of integrin activity.

Jeroen Pouwels1, Jonna Nevo, Teijo Pellinen

  • 1Centre for Biotechnology, University of Turku, Turku, Finland.

Journal of Cell Science
|July 24, 2012
PubMed
Summary
This summary is machine-generated.

Integrins are cell receptors crucial for biological processes. This study explores how integrin activity is switched off, a mechanism less understood than how it

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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

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Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies
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Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies

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Related Experiment Videos

Last Updated: May 20, 2026

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs
04:15

A Flow Cytometry-Based High-Throughput Technique for Screening Integrin-Inhibitory Drugs

Published on: February 2, 2024

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

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

Published on: June 13, 2014

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies
13:52

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies

Published on: March 19, 2014

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Integrins are transmembrane receptors vital for cell adhesion, tissue homeostasis, and immune responses.
  • Integrin activity is tightly regulated by intracellular signals, controlling ligand binding affinity.
  • Dysregulated integrin activation is implicated in diseases like cancer and immune deficiencies.

Purpose of the Study:

  • To discuss the molecular mechanisms and molecules involved in integrin inactivation.
  • To highlight the current knowledge gap regarding the deactivation process of integrins.

Main Methods:

  • Review of existing literature on integrin regulation.
  • Analysis of molecular interactions governing integrin conformational changes.

Main Results:

  • Integrin activation involves cytoplasmic proteins like talins and kindlins binding to β-integrin tails.
  • Mechanisms of integrin inactivation are less understood compared to activation pathways.

Conclusions:

  • Understanding integrin inactivation is critical for addressing diseases linked to integrin dysregulation.
  • Further research is needed to elucidate the molecular players and pathways of integrin deactivation.