Journal
CELL DEATH AND DIFFERENTIATION
Volume 23, Issue 6, Pages 952-961Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/cdd.2016.7
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Funding
- Ministry of Education, Science, Sports and Culture in Japan
- Core Research for Evolutional Science and Technology from Japan Science Technology Corporation
- Grants-in-Aid for Scientific Research [22000013, 15H05785] Funding Source: KAKEN
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Phosphatidylserine (PtdSer) is a phospholipid that is abundant in eukaryotic plasma membranes. An ATP-dependent enzyme called flippase normally keeps PtdSer inside the cell, but PtdSer is exposed by the action of scramblase on the cell's surface in biological processes such as apoptosis and platelet activation. Once exposed to the cell surface, PtdSer acts as an 'eat me' signal on dead cells, and creates a scaffold for blood-clotting factors on activated platelets. The molecular identities of the flippase and scramblase that work at plasma membranes have long eluded researchers. Indeed, their identity as well as the mechanism of the PtdSer exposure to the cell surface has only recently been revealed. Here, we describe how PtdSer is exposed in apoptotic cells and in activated platelets, and discuss PtdSer exposure in other biological processes.
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