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Related Concept Videos

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.
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Cytoskeletal Coordination in Cell Migration

A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell Migration

Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.

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Methods to Study Mrp4-containing Macromolecular Complexes in the Regulation of Fibroblast Migration
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Published on: May 19, 2016

Sprouty4 regulates endothelial cell migration via modulating integrin β3 stability through c-Src.

Yan Gong1, Xuehui Yang, Qing He

  • 1Center for Molecular Medicine, Maine Medical Center Research Institute, 81 Research Drive, Scarborough, ME, 04074, USA.

Angiogenesis
|August 20, 2013
PubMed
Summary

Sprouty4 (Spry4) inhibits endothelial cell migration and adhesion by regulating c-Src activity and integrin β3 levels. Targeting Spry4 offers a potential strategy for anti-angiogenesis therapies.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Angiogenesis involves complex signaling crosstalk between receptor tyrosine kinases (RTKs), Src family kinases, and integrins.
  • The precise mechanisms regulating these interconnected signaling pathways remain incompletely understood.
  • Sprouty4 (Spry4), an RTK modulator, is known to inhibit endothelial cell functions and angiogenesis, but its underlying mechanisms require further elucidation.

Purpose of the Study:

  • To investigate the role of Sprouty4 (Spry4) in regulating endothelial cell migration and adhesion.
  • To elucidate the molecular mechanisms by which Spry4 influences angiogenesis.
  • To determine the relationship between Spry4, c-Src, and integrin signaling in endothelial cells.

Main Methods:

  • Overexpression and knockdown of Spry4 in human endothelial cells.
  • Assays for cell migration and adhesion on vitronectin (VTN).
  • Analysis of signaling pathways including c-Src and Ras.
  • Western blot analysis to determine protein levels and tyrosine phosphorylation of integrin β3.
  • In vivo studies in murine embryos and yolk sacs.

Main Results:

  • Spry4 overexpression inhibited endothelial cell migration and adhesion on VTN, while Spry4 knockdown enhanced these processes.
  • These effects were dependent on c-Src activity but independent of Ras.
  • Spry4 disrupted crosstalk between vascular endothelial growth factor-2 and integrin αVβ3.
  • Spry4 modulated integrin β3 protein levels and tyrosine phosphorylation in a post-transcriptional manner, mediated by c-Src.
  • Spry4 regulated integrin β3 levels in vivo in murine embryos and yolk sacs.

Conclusions:

  • Sprouty4 (Spry4) plays a significant role in regulating endothelial cell migration and adhesion.
  • Spry4 influences angiogenesis by modulating c-Src activity and integrin β3 protein levels.
  • Targeting Spry4 presents a potential therapeutic strategy for developing anti-angiogenesis treatments.