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Casein kinase I delta controls centrosome positioning during T cell activation

Deborah Zyss1, Hani Ebrahimi, Fanni Gergely

  • 1Li Ka Shing Centre, Cancer Research UK Cambridge Research Institute, Cambridge CB2 0RE, England, UK.

The Journal of Cell Biology
|November 30, 2011
PubMed

Insights

Casein kinase I delta (CKIδ) is essential for centrosome repositioning in T cells. This protein interacts with EB1 to regulate microtubule growth, facilitating centrosome movement to the immunological synapse.

Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • The centrosome, despite its name, is often off-center in polarized cells.
  • T cell activation via T cell receptor (TCR) engagement induces cell polarity and centrosome migration to the immunological synapse (IS).
  • The precise molecular mechanisms linking TCR signaling to centrosome repositioning are not fully understood.

Purpose of the Study:

  • To investigate the role of centrosomal casein kinase I delta (CKIδ) in T cell centrosome translocation to the IS.
  • To elucidate the molecular interactions and signaling pathways involved in TCR-induced centrosome repositioning.

Main Methods:

  • Depletion of CKIδ in T lymphocytes using genetic approaches.
  • Inhibition of CKI in epithelial cells.
  • Analysis of microtubule dynamics and growth.
  • Investigation of CKIδ-EB1 interactions and phosphorylation.

Main Results:

  • CKIδ is critically required for centrosome translocation to the IS in T cells.
  • CKIδ directly binds and phosphorylates the microtubule plus-end-binding protein EB1.
  • A specific EB1-binding motif in CKIδ is necessary for centrosome repositioning.
  • CKIδ depletion or inhibition reduces microtubule growth speed in relevant cell types.

Conclusions:

  • CKIδ-EB1 complexes are crucial for regulating microtubule dynamics during T cell polarization.
  • These complexes likely promote the generation of long, stable microtubules essential for centrosome movement to the IS.
  • The findings reveal a novel mechanism for controlling cell polarity and organelle positioning in immune cells.

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