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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Microtubule-dependent modulation of adhesion complex composition.

Daniel H J Ng1, Jonathan D Humphries1, Adam Byron1

  • 1Wellcome Trust Centre for Cell-Matrix Research, Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT, United Kingdom.

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|December 20, 2014
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Summary
This summary is machine-generated.

Disrupting microtubules enlarges cell adhesion complexes by increasing contractility and altering component localization. This switch to focal adhesions is force-dependent, revealing a complex interplay between the cytoskeleton, adhesion maturation, and cell mechanics.

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Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Cell Adhesion Signaling

Background:

  • The microtubule network is crucial for regulating integrin-containing adhesion complexes and cell migration.
  • Microtubule disruption leads to enlarged adhesion complexes, increased RhoA-stimulated contractility, and inhibited turnover.
  • Global, unbiased studies on microtubule-dependent changes in adhesion complex composition were lacking.

Purpose of the Study:

  • To investigate global changes in adhesion complex composition and localization upon microtubule disruption using proteomics.
  • To elucidate the role of intracellular forces in regulating adhesion complex maturation.
  • To provide a comprehensive resource for future studies on cell adhesion signaling.

Main Methods:

  • Label-free quantitative mass spectrometry-based proteomics to analyze adhesion complex composition.
  • Nocodazole treatment to disrupt the microtubule network.
  • Immunofluorescence microscopy to assess protein localization.
  • Inhibition of cell contractility using Y-27632, a Rho-associated protein kinase inhibitor.

Main Results:

  • Nocodazole treatment increased the abundance of most adhesion complex components but did not alter α5β1 integrin levels.
  • Immunofluorescence revealed altered localization of adhesion complex components, with α5-integrin co-localizing with vinculin and tensin in both peripheral and central adhesions.
  • Microtubule disruption induced a switch in adhesion complex maturation favoring focal adhesions, which was dependent on RhoA-stimulated contractility.

Conclusions:

  • Microtubule disruption alters adhesion complex composition and promotes a maturation switch towards focal adhesions.
  • Intracellular contractile force, regulated by RhoA and actomyosin, is a key determinant of this nocodazole-induced conversion.
  • These findings highlight a complex interplay between the microtubule cytoskeleton, adhesion complex maturation, and cellular contractility.