A Versatile Protocol to Quantify BCR-mediated Phosphorylation in Human and Murine B Cell Subpopulations

Area of Science:

• Immunology
• Cell Biology
• Biochemistry

Background:

• B cell receptor (BCR) signaling is critical for B cell function, regulating differentiation, selection, survival, activation, and proliferation.
• Protein phosphorylation is a key mechanism in BCR signaling, but its analysis can be challenging.
• Phosphoflow cytometry offers a sensitive method for analyzing protein phosphorylation in single cells, surpassing traditional western blot analysis.

Purpose of the Study:

• To present a detailed, step-by-step phosphoflow cytometry protocol for evaluating the phosphorylation status of BCR signaling molecules.
• To enable the identification of various human and murine B cell subpopulations alongside signaling analysis.
• To provide guidance on additional phosphoflow targets crucial for BCR signaling.

Main Methods:

• Development and validation of a user-friendly phosphoflow cytometry protocol.
• Application of the protocol to analyze phosphorylation of BCR signaling molecules in human and murine B cells.
• Integration of extensive staining for B cell subpopulation identification.

Main Results:

• The protocol allows for sensitive detection of phosphorylation of various BCR signaling molecules.
• The method successfully evaluates the phosphorylation status in conjunction with extensive staining to identify B cell subpopulations.
• The protocol is applicable to both human and murine B cell populations.

Conclusions:

• The presented phosphoflow protocol is a valuable and user-friendly tool for studying BCR signaling.
• This method enhances the ability to analyze signaling pathways within specific B cell subsets.
• The protocol facilitates sensitive and quantitative assessment of protein phosphorylation in B cell immunology research.