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Real-time Live Imaging of T-cell Signaling Complex Formation
10:31

Real-time Live Imaging of T-cell Signaling Complex Formation

Published on: June 23, 2013

Cutting edge: integration of human T lymphocyte cytoskeleton by the cytolinker plectin

M J Brown1, J A Hallam, Y Liu

  • 1Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, 10 Center Drive, Bethesda, MD 20892, USA. BrownM@exchange.nih.gov

Journal of Immunology (Baltimore, Md. : 1950)
|July 7, 2001
PubMed

Insights

Plectin organizes the lymphocyte cytoskeleton by linking vimentin filaments to other structures. This protein complex is crucial for regulating cell shape changes during immune responses.

Area of Science:

  • Cell Biology
  • Immunology
  • Cytoskeletal Dynamics

Background:

  • Lymphocyte polarization is essential for immune cell function.
  • Vimentin intermediate filaments (IFs) collapse during polarization, but their interactions are poorly understood.

Purpose of the Study:

  • To investigate the role of plectin in lymphocyte cytoskeletal organization.
  • To elucidate the interactions of vimentin with other cytoskeletal proteins during T cell polarization.

Main Methods:

  • Immunofluorescence microscopy to visualize protein localization in human T lymphocytes.
  • Co-immunoprecipitation to identify protein complexes.
  • Overexpression studies in Jurkat T cells to assess functional impact.

Main Results:

  • Human T lymphocytes express plectin, which binds to vimentin IFs.
  • Plectin forms a complex with vimentin, actin, fodrin, moesin, and lamin B.
  • During polarization, plectin, vimentin, and fodrin redistribute to the uropod, linking the nucleus to the cell cortex.
  • Plectin overexpression causes vimentin aggregation near the nucleus.

Conclusions:

  • Plectin is a key organizer of the lymphocyte cytoskeleton.
  • The vimentin-plectin-fodrin complex mediates structural integrity during cell polarization.
  • Plectin likely regulates lymphocyte cytoarchitecture for processes like extravasation.

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