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Updated: Aug 11, 2026
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Modified Annexin V/Propidium Iodide Apoptosis Assay For Accurate Assessment of Cell Death
Published on: April 24, 2011
Refined Annexin V/PI Apoptosis Protocol to Minimize False-Positive Necrotic Cells
Aurora Schiavon1, Carlotta Evaristo1, Laura Saba2
1Department of Clinical and Biological Sciences (DSCB), University of Turin, Turin, Italy. Unit of translational research center for innovative medicine.
New Biotechnology
|August 9, 2026
Summary
A modified Annexin V/propidium iodide (PI) assay reduces false-positive necrosis signals caused by cell handling. This improved method enhances the accuracy of apoptosis and necrosis quantification in cancer research.
Area of Science:
- Cell Biology
- Biotechnology
- Cancer Research
Background:
- Programmed cell death (PCD) is crucial for tissue health and removing compromised cells.
- Apoptosis is a key PCD type, often measured by Annexin V/propidium iodide (PI) assay.
- Conventional assays yield false-positive necrosis signals due to cell handling artifacts.
Purpose of the Study:
- To develop a modified Annexin V/PI protocol for reliable necrosis detection.
- To improve the accuracy and standardization of apoptosis and necrosis assays.
- To enhance the evaluation of anticancer compounds in vitro.
Main Methods:
- A modified Annexin V/PI protocol was developed.
- Propidium iodide (PI) was added to culture medium before cell harvesting.
- This method targets cells with compromised membrane integrity, reducing handling artifacts.
Main Results:
- The modified protocol significantly reduced false-positive necrosis signals.
- Accurate discrimination between apoptotic and necrotic cells was achieved.
- Enhanced reliability in apoptosis assessment, especially for fragile cell systems.
Conclusions:
- The revised Annexin V/PI protocol offers improved accuracy and reproducibility.
- This method is compatible with existing detection kits.
- It provides a more robust tool for cancer research and drug screening.
