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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.
Insights
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.
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.
Abstract:
The humoral immune response is dependent on B cell activation and differentiation, which is typically triggered by the formation of immunological synapses at the interface between B cells and the antigen presenting surfaces. However, due to the highly dynamic and transient feature of immunological synapses, it has been difficult to capture and investigate the molecular events that occur within them. The planar lipids bilayer (PLB) supported antigen presenting surface combined with high-resolution high-speed total internal reflection fluorescence microscope (TIRFM) live cell imaging system has been proved to be a powerful tool that allows us to visualize the dynamic events in immunological synapse. In addition, the phospholipid phosphatidylinositol-(4,5)-biphosphate (PIP2) plays a unique role in B cell activation, and it is difficult to investigate the synaptic dynamics of PIP2 molecules. Hence, we describe here the general procedures for the utilization of a PLB based antigen presenting system combining TIRFM based imaging methods to visualize the spatial-temporal co-distribution of PIP2 and BCR microcluster within the B cell immunological synapse.
