Single-cell phospho-protein analysis by flow cytometry.

Area of Science:

• Cellular and Molecular Biology
• Immunology
• Biochemistry

Background:

• Understanding intracellular signaling pathways is crucial for both basic biological research and clinical applications.
• Current methods often lack the resolution to analyze signaling events at a single-cell level, especially in primary cells.
• Phosphorylation-dependent signaling plays a key role in cellular responses to environmental stimuli.

Purpose of the Study:

• To describe a robust protocol for monitoring intracellular phosphorylation-dependent signaling events on a single-cell basis.
• To enable the analysis of cell signaling in response to exogenous stimuli.
• To provide a method applicable to both basic research and clinical diagnostics.

Main Methods:

• Cells are treated with exogenous stimuli.
• Cells are fixed with formaldehyde and permeabilized with methanol.
• Staining is performed using phospho-specific antibodies to detect signaling states.

Main Results:

• The protocol allows for the determination of cell signaling states by measuring cellular responses to stimuli.
• This method can be applied to analyze signaling in cell lines, as well as human and murine primary cells, including rare populations.
• The technique facilitates the integration of biochemical analysis into primary cells within physiological contexts.

Conclusions:

• This single-cell based method provides valuable insights into phosphorylation-dependent signaling.
• Applications include clinical research for disease diagnostics and drug efficacy assessment.
• The technique is versatile for mechanistic studies in basic biology across diverse cell types.