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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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Related Experiment Video

Updated: Apr 21, 2026

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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CLIC4 regulates cell adhesion and β1 integrin trafficking.

Elisabetta Argenzio1, Coert Margadant2, Daniela Leyton-Puig2

  • 1Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066CX Amsterdam, The Netherlands e.argenzio@nki.nl w.moolenaar@nki.nl.

Journal of Cell Science
|October 26, 2014
PubMed
Summary

Chloride intracellular channel protein 4 (CLIC4) regulates cell adhesion and motility by controlling β1 integrin trafficking. This protein suppresses Rab35 activity, impacting cell movement and signaling pathways.

Keywords:
CLIC4Cell adhesionIntegrin traffickingLysophosphatidic acidRab35

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Chloride intracellular channel protein 4 (CLIC4) has diverse cellular roles, including ion channel formation and membrane remodeling.
  • CLIC4's recruitment to the plasma membrane by lysophosphatidic acid (LPA) and serum suggests involvement in exocytic-endocytic trafficking, but its precise function and targets are unclear.

Purpose of the Study:

  • To elucidate the function and subcellular targets of CLIC4 in cellular processes.
  • To investigate CLIC4's role in integrin trafficking and its relationship with Rab35.

Main Methods:

  • CLIC4 knockdown in HeLa and MDA-MB-231 cells.
  • Analysis of cell-matrix adhesion, cell spreading, cell motility, and integrin signaling.
  • Immunofluorescence microscopy to track CLIC4 and β1 integrin localization.
  • Assessment of β1 integrin internalization and recycling.
  • Investigation of CLIC4's effect on Rab35 activity.

Main Results:

  • CLIC4 knockdown reduced cell-matrix adhesion, cell spreading, and integrin signaling, while increasing cell motility.
  • LPA stimulated CLIC4 recruitment to β1 integrin at the plasma membrane and in Rab35-positive endosomes.
  • CLIC4 is essential for β1 integrin internalization and recycling, but not for EGF receptor trafficking.
  • CLIC4 suppresses Rab35 activity, antagonizing Rab35-dependent β1 integrin trafficking.

Conclusions:

  • CLIC4 regulates cell adhesion, spreading, and motility.
  • CLIC4 is a key regulator of β1 integrin trafficking, controlling its internalization and recycling.
  • CLIC4 acts as a suppressor of Rab35 activity, thereby influencing integrin-mediated cellular processes.