Simultaneous characterization of phospho-proteins and cell cycle in activated T cell subsets

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Multi-color flow cytometry is crucial for analyzing complex immune cell populations at single-cell resolution.
• T cell compartment analysis demands simultaneous measurement of multiple markers for lineage, phenotype, and function.
• Existing methods limit the simultaneous assessment of intracellular signaling, proliferation, and DNA synthesis.

Purpose of the Study:

• To develop and optimize a comprehensive flow cytometry protocol for simultaneous analysis of T cell lineage, phenotype, function, and intracellular signaling.
• To enable the simultaneous acquisition of data on surface markers, intracellular cytokines, kinase phosphorylation, cell proliferation, and DNA content.
• To provide mechanistic and kinetic insights into subset-specific T cell signaling pathways.

Main Methods:

• Optimization of antibody/fluorochrome combinations, permeabilization, fixation, and labeling times for improved DNA staining.
• Development of a multi-parameter flow cytometry protocol integrating surface marker expression, intracellular cytokine production, kinase phosphorylation status, cell proliferation, and DNA content.
• Application of the optimized protocol to T cells responding to specific antigens.

Main Results:

• A robust protocol was established allowing simultaneous measurement of diverse T cell characteristics.
• Optimized procedures enhanced DNA staining quality across different cell types.
• The method successfully revealed subset-specific signaling related to cytokine production and DNA synthesis in antigen-stimulated T cells.

Conclusions:

• The developed flow cytometry protocol offers an unprecedented capacity for simultaneous, high-resolution analysis of T cell responses.
• This comprehensive approach provides valuable mechanistic and kinetic information previously unattainable.
• The protocol is applicable to studying complex T cell signaling and function in various immunological contexts.