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Flow cytometry in the study of cell death
A L Bertho1, M A Santiago, S G Coutinho
1Laboratório de Imunidade Celular e Humoral, Departamento de Protozoologia, Instituto Oswaldo Cruz, Rio de Janeiro, Brasil. bertho@fiocruz.br
Memorias Do Instituto Oswaldo Cruz
|May 9, 2000
Summary
Flow cytometry effectively distinguishes apoptosis from necrosis by analyzing DNA content, plasma membrane integrity, and light scatter. These methods are valuable for basic research and clinical applications in cell death studies.
Area of Science:
- Cell Biology
- Biochemistry
- Immunology
Background:
- Apoptosis and necrosis are distinct cell death pathways with different molecular and biochemical mechanisms.
- Distinguishing between these cell death modes is crucial for understanding biological processes and disease states.
- Flow cytometry offers a powerful platform for analyzing cellular characteristics at a single-cell level.
Purpose of the Study:
- To review the application of flow cytometric methods for characterizing and differentiating apoptosis and necrosis.
- To explore the utility of these techniques in both clinical and basic research settings.
- To highlight key cellular features measurable by flow cytometry for identifying distinct cell death mechanisms.
Main Methods:
- Analysis of DNA content to detect DNA fragmentation characteristic of apoptosis.
- Assessment of plasma membrane integrity, which is compromised in necrosis but maintained in apoptosis.
- Evaluation of light scatter properties (forward and side scatter) as indicators of early apoptotic changes.
Main Results:
- Decreased DNA stainability in permeabilized cells indicates endonuclease activation during apoptosis.
- Loss of plasma membrane integrity is a hallmark of necrosis.
- Reduced forward light scatter with altered side scatter are early apoptotic indicators.
- Flow cytometry enables identification of apoptotic cells and their cell cycle phase specificity.
Conclusions:
- Flow cytometry is a versatile tool for investigating the molecular and biochemical mechanisms of apoptosis in basic research.
- Clinical applications include monitoring early signs of apoptosis, potentially predicting treatment outcomes.
- This technique provides a quantitative and objective means to differentiate apoptosis from necrosis.