A flow cytometry technique to study nuclear factor-kappa B (NFkappaB) translocation during human B cell activation

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• B lymphocytes play a crucial role in adaptive immunity.
• Dysregulation of B cell signaling can lead to various pathologies, including immunoproliferative disorders.
• Understanding B cell activation pathways, such as NFkappaB translocation, is vital for disease research.

Purpose of the Study:

• To present an original, convenient, and reproducible flow cytometry technique for studying NFkappaB translocation in activated B cells.
• To quantify NFkappaB p65 intranuclear translocation during in vitro B cell activation.
• To establish a sensitive assay for B cell signaling studies.

Main Methods:

• Utilized flow cytometry to detect NFkappaB p65 translocation in purified CD19+ B cells.
• Stimulated B cells with anti-IgM antibodies (10 ng/ml) for 45 minutes at 37°C.
• Analyzed NFkappaB staining profiles in peripheral blood mononuclear cell (PBMC) B cells and tonsil B cells.

Main Results:

• A novel flow cytometry assay successfully detected NFkappaB p65 intranuclear translocation upon B cell activation.
• Optimal stimulation (10 ng/ml) for 45 minutes induced a significant increase in NFkappaB translocation (P<0.05).
• Observed distinct NFkappaB staining profiles (one-pike vs. two-pike) in PBMC B cells versus tonsil B cells.

Conclusions:

• The developed flow cytometry assay is a feasible, sensitive, and reproducible method for studying B cell activation via NFkappaB translocation.
• This technique provides valuable insights into B cell signal transduction pathways.
• The assay facilitates research into B cell dysregulations and associated pathologies.