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Published on: July 23, 2010
Annexin V/7-AAD staining in keratinocytes
Maya Zimmermann1, Norbert Meyer
1Schweizerisches Institut für Allergie und Asthma Forschung (SIAF), Davos, Switzerland. maya.zimmermann@siaf.uzh.ch
Methods in Molecular Biology (Clifton, N.J.)
|April 7, 2011
Summary
Annexin V/7-amino-actinomycin staining effectively distinguishes early apoptosis from late apoptosis and necrosis. This method utilizes phosphatidylserine exposure for early apoptosis detection and membrane permeability for late-stage cell death identification.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Apoptosis and necrosis are critical cellular processes.
- Distinguishing between early and late apoptosis, and necrosis, is crucial for research.
- Traditional methods may lack specificity or convenience.
Purpose of the Study:
- To present Annexin V/7-amino-actinomycin staining as a method for discriminating cell death stages.
- To explain the underlying mechanisms of this staining technique.
Main Methods:
- Utilizing Annexin V to detect phosphatidylserine (PS) externalization in early apoptosis.
- Employing 7-amino-actinomycin (7-AAD) as a vital dye to identify membrane compromised cells in late apoptosis and necrosis.
Main Results:
- Annexin V binds to phosphatidylserines exposed on the outer membrane of early apoptotic cells.
- 7-AAD penetrates cells with compromised membranes, staining DNA in late apoptotic and necrotic cells.
- This dual staining allows clear differentiation between early apoptotic, late apoptotic, and necrotic populations.
Conclusions:
- Annexin V/7-AAD staining is a convenient and effective method for discriminating between early apoptosis, late apoptosis, and necrosis.
- The technique relies on distinct cellular changes occurring during programmed cell death and necrosis.
