FACS-based detection of phosphorylated histone H3 for the quantitation of mitotic cells

Area of Science:

• Cell Biology
• Genomics
• Cancer Research

Background:

• The G2 checkpoint is crucial for preventing cell division with damaged DNA, maintaining genomic integrity.
• Mutations in tumor cells can inactivate checkpoints, leading to genomic instability and altered responses to DNA-damaging chemotherapy.
• Traditional assessment of the G2 checkpoint involves laborious microscopic counting of mitotic cells.

Purpose of the Study:

• To develop and describe a rapid, reliable method for quantifying mitotic cells.
• To provide an alternative to traditional microscopic cell counting for G2 checkpoint assessment.
• To enable efficient analysis of cellular responses in cancer research and drug development.

Main Methods:

• Utilized fluorescence-activated cell sorting (FACS) analysis.
• Employed a specific antibody to detect an intra-nuclear antigen present exclusively in mitotic cells.
• Developed a single-day protocol for cell staining and FACS analysis.

Main Results:

• The FACS method accurately quantifies mitotic cells.
• The developed protocol is rapid and reliable, completing in a single day.
• This method offers a significant improvement over traditional microscopic counting.

Conclusions:

• The described FACS method provides a fast and dependable way to quantitate mitotic cells.
• This technique is valuable for assessing G2 checkpoint function in various research applications, including cancer studies.
• The method facilitates a better understanding of genomic instability and cellular responses to DNA-damaging agents.