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Boxcar Imaging FCS Reveals Membrane Raft Stabilization Kinetics in Antigen-Stimulated Mast Cells.

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  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853.

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Summary
This summary is machine-generated.

Antigen stimulation triggers mast cell responses by reorganizing membrane rafts, with Lyn kinase diffusion slowing faster than lipid probes. This reveals rapid signaling initiation precedes global membrane changes.

Keywords:
Imaging fluorescence correlation spectroscopyMast cell stimulation by antigenTime dependent diffusion changes measured with boxcar segmentationplasma membrane domains or raftstransmembrane signaling

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Area of Science:

  • Cellular biology
  • Biophysics
  • Immunology

Background:

  • Antigen (Ag) crosslinking of immunoglobulin E-receptor (IgE-FcεRI) complexes initiates mast cell signaling for allergic responses.
  • This process involves Lyn tyrosine kinase coupling within liquid-ordered (Lo)-like membrane regions (rafts).
  • Previous studies used Imaging Fluorescence Correlation Spectroscopy (ImFCS) to observe membrane reorganization after Ag addition.

Purpose of the Study:

  • To quantify the kinetics of membrane transition between resting and Ag-stimulated states.
  • To investigate the dynamic diffusion changes of Lyn kinase and membrane lipids during mast cell activation.
  • To correlate membrane reorganization timing with early signaling events.

Main Methods:

  • Development of Boxcar ImFCS for time-resolved diffusion measurements on a sub-minute scale.
  • Measurement of Lyn-EGFP and PM-EGFP (Lo-preferring) diffusion dynamics.
  • Measurement of EGFP-GG (Ld-preferring) diffusion dynamics and comparison with Syk recruitment.

Main Results:

  • Ag stimulation caused gradual diffusion decreases for Lyn-EGFP (t1/2 = 6.9 min) and PM-EGFP (t1/2 = 12 min).
  • EGFP-GG showed faster diffusion with t1/2 = 9.4 min.
  • Syk recruitment occurred faster (t1/2 = 5.0 min) than global membrane reorganization, indicating early signaling.

Conclusions:

  • Boxcar ImFCS enables detailed kinetic analysis of stimulus-induced membrane dynamics.
  • Lyn's protein interactions accelerate its diffusion transition compared to lipid probes.
  • Transmembrane signaling initiation precedes complete raft condensation and global membrane reorganization.