8 color, 10-parameter flow cytometry to elucidate complex leukocyte heterogeneity

Area of Science:

• Immunology
• Biotechnology
• Analytical Chemistry

Background:

• Multiparameter flow cytometry is crucial for analyzing complex biological systems.
• Existing technologies often face limitations in the number of simultaneous measurements.
• Accurate quantification of cellular markers requires advanced staining and detection methods.

Purpose of the Study:

• To develop and evaluate an 8-color flow cytometry technology for simultaneous and independent measurement of fluorescent molecules on single cells.
• To assess the performance and utility of the developed technology for analyzing immune cell populations.

Main Methods:

• Development of novel chemistry, instrumentation, and software for multi-color fluorescence detection.
• Construction of a hybrid flow cytometer with eight fluorescence detectors and two light scatter channels.
• Utilization of three laser beams (407 nm, 488 nm, 595 nm) for excitation and advanced software for post hoc fluorescence compensation.

Main Results:

• Successful implementation of an 8-color immunofluorescence staining protocol using direct conjugates.
• Six of seven novel fluorochromes demonstrated brightness comparable to fluorescein; three were significantly brighter.
• Demonstrated the utility of the 8-color, 10-parameter technology in analyzing human and murine immune cells.

Conclusions:

• The developed 8-color flow cytometry technology enables robust and simultaneous analysis of multiple cellular markers.
• The technology offers enhanced sensitivity for detecting low-abundance antigens, particularly with brighter fluorochromes.
• This advancement provides a powerful tool for high-dimensional analysis of immune cell populations and other biological applications.