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Cofilin peptide homologs interfere with immunological synapse formation and T cell activation

Sybille M Eibert1, Kyeong-Hee Lee, Rüdiger Pipkorn

  • 1Institute for Immunology, Ruprecht-Karls-University, D-69120 Heidelberg, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|February 6, 2004
PubMed

Insights

Cofilin protein is essential for T cell activation by reorganizing the actin cytoskeleton to form immunological synapses. Blocking cofilin/F-actin interactions inhibits T lymphocyte activation and cytokine production.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Supramolecular activation clusters in the immunological synapse are vital for T lymphocyte signaling and activation.
  • Costimulation-dependent actin cytoskeleton reorganization is necessary for forming these clusters.

Purpose of the Study:

  • To identify key actin-remodeling proteins involved in T lymphocyte activation.
  • To investigate the role of cofilin in immunological synapse formation and T cell activation.

Main Methods:

  • Utilized cell-permeable peptides to block cofilin/F-actin interactions in human T lymphocytes.
  • Assessed effects on receptor capping and immunological synapse formation.
  • Measured T cell activation markers including cytokine production and proliferation.

Main Results:

  • Identified cofilin as a critical actin-remodeling protein in T lymphocytes.
  • Blocking cofilin/F-actin interactions impaired receptor capping and immunological synapse formation.
  • Inhibition of cofilin function led to reduced T cell activation, cytokine production, and proliferation.

Conclusions:

  • Cofilin plays a crucial role in costimulation-dependent actin dynamics essential for immunological synapse formation.
  • Targeting cofilin/F-actin interactions offers a potential strategy to modulate T cell-mediated immune responses.

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