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Phosphatidylserine (PS) is the major acidic phospholipid class that accounts for 13–15% of the phospholipids in the human cerebral cortex. [7] In the plasma membrane, PS is localized exclusively in the cytoplasmic leaflet where it forms part of protein docking sites necessary for the activation of several key signaling pathways.
For example, phosphatidylserine is an "eat-me" signal that, when exposed on the surface of a cell, triggers phagocytes (i.e. cells that eat other cells) to eat that cell. Phosphatidylserine is normally found on the inside of healthy cells, but can become exposed on the surface of dying, activated or stressed cells.
The most well characterised eat-me signal is the phospholipid phosphatidylserine. Healthy cells do not expose phosphatidylserine on their surface, whereas dead, dying, infected, injured and some activated cells expose phosphatidylserine on their surface in order to induce phagocytes to phagocytose them.
Phosphatidylserine decarboxylase is the enzyme that is used to decarboxylate phosphatidylserine in the first pathway. The phosphatidylserine decarboxylation pathway is the main source of synthesis for phosphatidylethanolamine in the membranes of the mitochondria. Phosphatidylethanolamine produced in the mitochondrial membrane is also ...
L-α-Glycerophosphorylcholine (alpha-GPC, choline alfoscerate, sn-glycero-3-phosphocholine) is a natural choline compound found in the brain. It is also a parasympathomimetic acetylcholine precursor [ 1 ] which has been investigated for its potential for the treatment of Alzheimer's disease [ 2 ] and other dementias .
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