Differentiation and assessment of cell death
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Published on: October 21, 2012
1Advanced Technology, Beckman Coulter, Inc., Miami, Florida 33196-2500, USA.
Abstract:
Three documented cell death pathways, apoptosis, necrosis, and oncosis will be discussed. The end result of each pathway is cell death; however, the path by which death is achieved and the morphological and physiological traits of each may be strikingly distinct. Now that well characterized models have been established for particularly apoptosis, the induction pathway(s) has received much attention and the pathway pathology is beginning to be understood. Three model systems were investigated: APO-1/Fas, hypoxia, and oncosis. Cell death was induced, and during a time course sampling, a variety of methodologies, including DNA fragmentation by flow cytometry and gel electrophoresis, DNA staining, flow cytometric light scatter, transmission electron microscopy, anti-tubulin, Trypan blue, annexin V, and anti-APO2.7 were employed to monitor the cell death progress. The apoptotic pathway in the CD95-induced Jurkat cell model was further investigated using caspase inhibitor peptides and analyzed for APO2.7 antigen expression and DNA fragmentation by flow cytometry. Time course sampling characterized the cell death pathway and helped to differentiate the capabilities of the methods. The time to response and duration of the response were dependent upon cell type and method of induction. The CD95-induced Jurkat cell model showed a classical apoptotic response; however the MDA-MB-175-VII hypoxia model and the anti-5A9 induced oncosis model were not as clear. Each methodology shows advantages and disadvantages that allow the investigator to select several methods to identify, monitor, and enumerate cells with respect to cell death progression using time course studies.
Insights
This study compares apoptosis, necrosis, and oncosis cell death pathways using various methods. Apoptosis was clearly identified, but hypoxia and oncosis models showed less distinct cell death characteristics.
Area of Science:
- Cell Biology
- Molecular Biology
Background:
- Cell death is a fundamental biological process with distinct pathways including apoptosis, necrosis, and oncosis.
- Understanding these pathways is crucial for cell biology research and disease pathology.
Purpose of the Study:
- To investigate and differentiate three distinct cell death pathways: apoptosis, necrosis, and oncosis.
- To evaluate various methodologies for monitoring cell death progression in different model systems.
Main Methods:
- Investigated three model systems: APO-1/Fas (apoptosis), hypoxia (MDA-MB-175-VII cells), and oncosis (anti-5A9 induction).
- Employed time course sampling with methodologies including flow cytometry (DNA fragmentation, light scatter, annexin V, APO2.7), gel electrophoresis, DNA staining, transmission electron microscopy, and Trypan blue exclusion.
- Utilized caspase inhibitor peptides to further analyze the apoptotic pathway in the CD95-induced Jurkat cell model.
Main Results:
- The CD95-induced Jurkat cell model exhibited a classical apoptotic response.
- The hypoxia and oncosis models demonstrated less clear cell death pathway characteristics.
- Methodologies varied in their advantages and disadvantages for monitoring cell death progression.
Conclusions:
- Different cell death pathways (apoptosis, necrosis, oncosis) present distinct morphological and physiological traits.
- Method selection is critical for accurately identifying, monitoring, and enumerating cells undergoing cell death.
- Time course studies are essential for characterizing cell death kinetics and differentiating pathway responses.
