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Related Concept Videos

Integrins01:10

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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.
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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.
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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."
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Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
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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...
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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
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Author Spotlight: Development of a Method for Identifying Small Molecular Antagonists of &#946;2 Integrin Activation
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Integrin function in vascular biology: a view from 2013.

Edward F Plow1, Julia Meller, Tatiana V Byzova

  • 1Department of Molecular Cardiology, Taussig Cancer Center, Lerner Research Institute, Cleveland Clinic, Ohio, USA.

Current Opinion in Hematology
|March 15, 2014
PubMed
Summary
This summary is machine-generated.

Integrin activation in vascular biology relies on talin and kindlin proteins. Integrins and growth factor receptors on endothelial cells engage in bidirectional communication, crucial for angiogenesis.

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Area of Science:

  • Vascular Biology
  • Cellular Signaling
  • Hematology

Background:

  • Integrins are critical mediators of cell-cell and cell-matrix interactions.
  • Understanding integrin function is vital for numerous physiological and pathological processes, including inflammation and angiogenesis.

Purpose of the Study:

  • To review recent advancements in integrin activation mechanisms.
  • To explore the crosstalk between integrins and growth factor receptors in vascular biology.

Main Methods:

  • Review of in vivo studies in mice and humans.
  • Analysis of in vitro models for integrin activation.
  • Examination of molecular interactions between integrins and signaling receptors.

Main Results:

  • Leukocytes can transfer molecules to endothelial cells, influencing vascular signaling.
  • Kindlin and talin are essential for integrin activation, as demonstrated by gene inactivation studies.
  • Direct physical interaction between integrins and vascular endothelial growth factor receptor 2 regulates their mutual activation.

Conclusions:

  • Talin and kindlin are indispensable for integrin ligand binding and functional responses like platelet aggregation and leukocyte extravasation.
  • Bidirectional communication between integrins and vascular endothelial growth factor receptor 2 on endothelial cells is regulated during angiogenesis.
  • Further research is needed to fully elucidate integrin-ligand interactions and their therapeutic potential.