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Related Experiment Video

Updated: Jul 20, 2025

Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy
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Imaging PIP2 and BCR microclusters in B cell immunological synapse.

Yue Qiu1, Sichen Liu2, Xingyu Ji2

  • 1Institute of Molecular Immunology, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, China.

Methods in Cell Biology
|July 29, 2023
PubMed
Summary

This study visualizes the spatial-temporal co-distribution of phosphatidylinositol-(4,5)-biphosphate (PIP2) and B cell receptor (BCR) microclusters within the B cell immunological synapse using planar lipid bilayers and TIRFM imaging.

Keywords:
B cell receptorBCR microclusterImmunological synapsePIP2

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Last Updated: Jul 20, 2025

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Area of Science:

  • Immunology
  • Cell Biology
  • Biophysics

Background:

  • B cell activation is crucial for humoral immunity, relying on immunological synapses.
  • Investigating dynamic molecular events within transient immunological synapses is challenging.
  • Phosphatidylinositol-(4,5)-biphosphate (PIP2) has a key role in B cell activation, but its synaptic dynamics are poorly understood.

Purpose of the Study:

  • To describe methods for visualizing the spatial-temporal co-distribution of PIP2 and BCR microclusters within the B cell immunological synapse.
  • To leverage planar lipid bilayer (PLB) supported antigen-presenting surfaces and total internal reflection fluorescence microscopy (TIRFM) for high-resolution live-cell imaging.

Main Methods:

  • Utilized a planar lipid bilayer (PLB) based antigen-presenting system.
  • Employed high-resolution, high-speed total internal reflection fluorescence microscopy (TIRFM) for live-cell imaging.
  • Visualized the spatial-temporal co-distribution of PIP2 and B cell receptor (BCR) microclusters.

Main Results:

  • Successfully visualized dynamic events within the B cell immunological synapse.
  • Captured the spatial-temporal co-distribution of PIP2 and BCR microclusters.
  • Demonstrated the utility of PLB-TIRFM for studying molecular dynamics in immunological synapses.

Conclusions:

  • The described PLB-TIRFM system is a powerful tool for investigating molecular events in immunological synapses.
  • This method enables the study of the synaptic dynamics of key molecules like PIP2 during B cell activation.
  • Provides new insights into the role of PIP2 in B cell immune responses.