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Updated: Jul 19, 2026

Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays
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Topography of plasma membrane microdomains and its consequences for mast cell signaling

Petr Heneberg1, Pavel Lebduska, L'ubica Dráberová

  • 1Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic.

European Journal of Immunology
|October 3, 2006
PubMed

Insights

Thy-1 aggregation on cell surfaces triggers signaling pathways by interacting with other membrane proteins. This cross-talk, dependent on actin filaments, involves adaptor proteins like NTAL and LAT, influencing cellular activation.

Area of Science:

  • Cell Biology
  • Immunology
  • Biochemistry

Background:

  • Thy-1 (CD90) is a GPI-anchored glycoprotein involved in mast cell and basophil activation, independent of FcepsilonRI.
  • Lipid rafts are suggested to play a role in Thy-1 and FcepsilonRI signaling, but their properties remain unclear.

Purpose of the Study:

  • To investigate the topography of Thy-1 isoforms and Thy-1-induced signaling events in rat basophilic leukemia cells.
  • To elucidate the role of membrane microdomains and protein interactions in Thy-1 signaling.

Main Methods:

  • Utilized rat basophilic leukemia cells and transfectants expressing Thy-1 isoforms.
  • Employed light and electron microscopy, and fluorescence resonance energy transfer (FRET) analysis.
  • Investigated Thy-1 aggregation, colocalization with adaptor proteins (NTAL, LAT), and tyrosine phosphorylation.

Main Results:

  • Thy-1 isoforms were initially randomly distributed but showed cross-talk upon aggregation, dependent on actin filaments.
  • Thy-1 aggregates colocalized with NTAL and LAT, which reside in different membrane microdomains.
  • Thy-1 aggregation induced tyrosine phosphorylation of NTAL and LAT.

Conclusions:

  • Aggregated GPI-anchored proteins, like Thy-1, can recruit diverse membrane proteins into distinct clusters.
  • This recruitment facilitates cross-talk between different signaling pathways, including those involving Thy-1 and FcepsilonRI.
  • Thy-1 aggregation initiates signaling cascades through interactions with adaptor proteins within specific membrane microdomains.

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