Polymeric dipicolylamine based mass tags for mass cytometry.

Area of Science:

• Biotechnology
• Analytical Chemistry
• Immunology

Background:

• Mass cytometry is a high-dimensional single-cell analysis technique using metal-isotope-tagged antibodies.
• Current reagents limit analysis to ~50 parameters due to metal-chelating polymer constraints, primarily binding hard metal ions.
• A need exists to expand the range of detectable metal isotopes for more comprehensive single-cell analysis.

Purpose of the Study:

• To synthesize and characterize novel metal-chelating polymers for mass cytometry.
• To enable the use of intermediate and soft metal ions, expanding the detectable parameter range.
• To develop new conjugation strategies for antibody-polymer assembly.

Main Methods:

• Synthesis of metal-chelating polymers with pendant dipicolylamine chelators.
• Development of thiol-maleimide and DBCO-azide click chemistry conjugation strategies.
• Characterization of antibody-polymer conjugates (CD20, CD8a) for mass cytometry applications.

Main Results:

• Successfully synthesized and characterized novel polymers capable of binding intermediate to soft metals like rhenium and platinum.
• Demonstrated effective antibody conjugation using both thiol-maleimide and click chemistry reactions.
• Validated the utility of these new elemental mass tags in multi-parameter single-cell immunoassays.

Conclusions:

• The developed dipicolylamine-based polymers represent a significant advancement in mass cytometry reagents.
• These new polymers expand the elemental mass tag toolbox, enabling higher-dimensional single-cell analysis.
• The findings facilitate more comprehensive cellular profiling and biomarker discovery.