Abstract
Phosphatidylserine (PS) exposure on the external leaflet of the plasma membrane is widely observed during apoptosis and forms the basis for the annexin V binding assay to detect apoptotic cell death. Current efforts to explain PS exposure focus on two potential mechanisms, activation of a phospholipid scramblase or calcium-mediated trafficking of lysosomes to the cell surface. Here, we provide evidence that apoptotic PS exposure instead reflects bidirectional trafficking of membrane between the cell surface and cytoplasm. Using a series of cell lines, some of which expose large amounts of PS during apoptosis and some of which do not, we demonstrate that accumulation of plasma membrane-derived cytoplasmic vesicles in a dynamin-, clathrin- and Cdc42-independent manner is a previously undescribed but widely occurring feature of apoptosis. The apoptotic exposure of PS occurs when these vesicles traffic back to cell surface in a calcium-dependent process that is deficient in a substantial fraction of human cancer cell lines. These observations provide a new model for PS externalization during apoptosis and simultaneously identify an altered step that accounts for the paucity of apoptotic PS exposure in many cell lines.
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Abbreviations
- PS:
-
phosphatidylserine
- ABC:
-
ATP-binding cassette
- APC:
-
allophycocyanin
- CHX:
-
cycloheximide
- EBFP:
-
enhanced blue fluorescent protein
- EGFP:
-
enhanced green fluorescent protein
- FBS:
-
heat-inactivated fetal bovine serum
- FITC:
-
fluorescein isothiocyanate
- PLSCR1:
-
phospholipid scramblase 1
- PBS:
-
calcium- and magnesium-free Dulbecco’s phosphate-buffered saline
- PCR:
-
polymerase chain reaction
- Q-VD-OPh:
-
N-(2-quinolyl)valylaspartyl-(2,6-difluorophenoxy)methyl ketone
- TRAIL:
-
tumor necrosis factor-α-related apoptosis inducing ligand
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Acknowledgements
This work was supported in part by R01 CA69008 and a predoctoral fellowship to S-HL from the Mayo Foundation for Education and Research. We gratefully acknowledge use of the Mayo Clinic Flow Cytometry and Electron Microscopy Core Facilities; assistance of Trace Christensen, Scott Gamb and Cindy Uhl with the electron micrographs; assistance of Anand Patel and Kevin Peterson with confocal microscopy and cell size determinations, respectively; and helpful conversations with Greg Gores.
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Lee, SH., Meng, X., Flatten, K. et al. Phosphatidylserine exposure during apoptosis reflects bidirectional trafficking between plasma membrane and cytoplasm. Cell Death Differ 20, 64–76 (2013). https://doi.org/10.1038/cdd.2012.93
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DOI: https://doi.org/10.1038/cdd.2012.93
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