Cell Proliferation Method: Click Chemistry Based on BrdU Coupling for Multiplex Antibody Staining.

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Cell cycle analysis commonly uses 5-bromo-2 eal-deoxyuridine (BrdU) incorporation into DNA.
• BrdU detection requires DNA denaturation, which destroys protein epitopes, hindering multiplex immunocytochemical analysis.
• Existing methods limit simultaneous detection of DNA synthesis and other cellular markers.

Purpose of the Study:

• To develop a novel assay for detecting S-phase cells without DNA denaturation.
• To enable multiplex analysis by preserving protein epitopes during DNA synthesis detection.
• To improve upon traditional BrdU assays in sensitivity and compatibility with multicolor analysis.

Main Methods:

• Utilized 5-ethynyl-2 eal-deoxyuridine (EdU) pulse labeling to incorporate into newly synthesized DNA.
• Employed copper-catalyzed

Main Results:

• The novel EdU assay successfully detected DNA synthesis without requiring DNA denaturation.
• This method preserved protein epitopes, allowing for multiplex analysis.
• The assay demonstrated higher sensitivity compared to traditional BrdU detection.
• Successful multicolor and multiplex analysis was achieved in flow cytometry and image-based cytometry.

Conclusions:

• A novel, non-denaturing assay for S-phase detection using EdU and click chemistry has been developed.
• This method overcomes limitations of BrdU assays by preserving protein epitopes for multiplexing.
• The EdU assay offers enhanced sensitivity and broad applicability in flow cytometry and image-based cytometry for cell cycle studies.