Lipid composition of membranes of amine-storage organelles.
1. The lipid composition of the membranes from isolated 5-hydroxytryptamine-storage organelles of blood platelets of rabbits and of those from chromaffin granules of bovine adrenal medulla was compared. 2. In contrast with the membranes of the chromaffin granules, those of the 5-hydroxytryptamine organelles did not contain lysophosphatidylcholine (lysolecithin). 3. Both the cholesterol/phospholipid ratio and the relative proportions of phosphatidylethanolamine (kephalin), phosphatidylinositol and phosphatidylserine were about the same in both membranes, whereas phosphatidylcholine (lecithin) and sphingomyelin showed somewhat higher values in the membranes of the 5-hydroxytryptamine organelles. 4. In conclusion, the release of 5-hydroxytryptamine from blood platelets is probably not correlated with the presence of lysophosphatidylcholine in the membranes of the storage organelles and may thus differ from the mechanism of catecholamine release in adrenal medulla.
18 references, click to expand
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