Morphometric quantification of apoptotic stages in cell culture

Area of Science:

• Cell Biology
• Biochemistry
• Histology

Background:

• Apoptosis, or programmed cell death, is crucial for development and tissue homeostasis.
• Traditional methods for quantifying apoptosis often rely on fluorescent DNA dyes.
• Morphological changes like chromatin condensation and nuclear fragmentation are key indicators of apoptosis.

Purpose of the Study:

• To develop and validate a reliable light microscopy-based method for analyzing morphological stages of apoptosis in cultured cells.
• To investigate apoptosis induced by inadequate cell-matrix interactions using a human neuroblastoma cell line.
• To correlate morphological changes with biochemical markers of apoptosis.

Main Methods:

• Utilized the human neuroblastoma cell line SK-N-BE.
• Induced apoptosis by culturing cells on polyHEMA, poly-L-lysine, or collagen I.
• Performed quantitative morphometric and densitometric analysis after hematoxylin nuclear staining and caspase-3 immunocytochemistry.

Main Results:

• The developed method reliably identified distinct morphological stages of apoptosis.
• Observed caspase-3 activation and subsequent DNA fragmentation and condensation.
• Demonstrated the ability to detect subtle differences in apoptosis progression.

Conclusions:

• A robust morphological analysis method using light microscopy for studying apoptosis in cultured cells was established.
• This technique allows for precise tracking of apoptosis progression and caspase-3 activation.
• The method provides a valuable tool for investigating apoptosis triggered by altered cell-matrix interactions.