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Annexin V-affinity assay: a review on an apoptosis detection system based on phosphatidylserine exposure
M van Engeland1, L J Nieland, F C Ramaekers
1Department of Molecular Cell Biology and Genetics, Maastricht University, The Netherlands.
Abstract:
Apoptosis is a programmed, physiological mode of cell death that plays an important role in tissue homeostasis. Understanding of the basic mechanisms that underlie apoptosis will point to potentially new targets of therapeutic treatment of diseases that show an imbalance between cell proliferation and cell loss. In order to conduct such research, techniques and tools to reliably identify and enumerate death by apoptosis are essential. This review focuses on a novel technique to detect apoptosis by targeting for the loss of phospholipid asymmetry of the plasma membrane. It was recently shown that loss of plasma membrane asymmetry is an early event in apoptosis, independent of the cell type, resulting in the exposure of phosphatidylserine (PS) residues at the outer plasma membrane leaflet. Annexin V was shown to interact strongly and specifically with PS and can be used to detect apoptosis by targeting for the loss of plasma membrane asymmetry. Labeled annexin V can be applied both in flow cytometry and in light microscopy in both vital and fixed material by using appropriate protocols. The annexin V method is an extension to the current available methods. This review describes the basic mechanisms underlying the loss of membrane asymmetry during apoptosis and discusses the novel annexin V-binding assay.
Insights
Detecting apoptosis, a key cell death process, is crucial for understanding diseases. A new method uses Annexin V to identify early cell membrane changes, offering a reliable tool for apoptosis research and potential therapies.
Area of Science:
- Cell Biology
- Biochemistry
- Physiology
Background:
- Apoptosis is vital for tissue homeostasis.
- Imbalances in cell death contribute to various diseases.
- Reliable methods to detect apoptosis are essential for research.
Purpose of the Study:
- To review a novel technique for detecting apoptosis.
- To focus on Annexin V as a tool to identify early apoptotic events.
- To describe the mechanisms of membrane asymmetry loss in apoptosis.
Main Methods:
- Targeting the loss of phospholipid asymmetry in the plasma membrane.
- Utilizing Annexin V's specific binding to phosphatidylserine (PS).
- Applying labeled Annexin V in flow cytometry and light microscopy.
Main Results:
- Loss of plasma membrane asymmetry is an early, cell-type-independent event in apoptosis.
- Phosphatidylserine (PS) residues are exposed on the outer plasma membrane leaflet.
- Annexin V specifically binds to exposed PS, enabling apoptosis detection.
Conclusions:
- Annexin V is a valuable tool for detecting apoptosis by targeting membrane asymmetry loss.
- This method complements existing techniques for apoptosis enumeration.
- Understanding these mechanisms can lead to new therapeutic targets for diseases with cell death imbalances.