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• W1970574464 abstract "Receptor-mediated activation of many cells, including blood platelets, leads to changes at the cytoplasmic side of the membrane. In platelets, phospholipases, such as phospholipase C and phospholipase A2, have been shown to become activated. From phospholipids they generate the second messengers diacylglycerol and inositol phosphate(s) and fatty acids, respectively. At the same time, actin polymerization and reorganization of actin filaments into bundles and networks occurs. Here, the association of lipids, radiolabeled either with saturated (palmitic acid) or unsaturated (arachidonic acid) fatty acids, with the cytoskeletons of resting and activated human blood platelets was studied. The relative binding of lipid components to the cytoskeleton of activated platelets labeled with palmitic acid is six times higher than that of platelets labeled with arachidonic acid. Analysis of lipids associated with isolated cytoskeletons of resting and activated platelets (labeled with palmitic acid) showed a 30-fold increase in the binding of labeled lipids to the cytoskeletal structures during activation. Both diacylglycerol and fatty acids were found to be associated with the cytoskeleton of activated platelets. Gel filtration, chromatofocusing, and immunoprecipitation studies demonstrated tight binding of these lipids to alpha-actinin. alpha-Actinin is one of the proteins that rapidly becomes associated with the cytoskeleton during platelet aggregation; it is also one of the molecules proposed to act as an actin-membrane linker. The results reported indicate a possible participation of alpha-actinin, fatty acids, and the phosphoinositide-derived second messenger diacylglycerol in the regulation of cytoskeleton-membrane interactions. Together with the results of others they suggest a possible involvement of the phosphatidylinositol cycle in the assembly of actin filaments and their anchoring to membranes." @default.
• W1970574464 created "2016-06-24" @default.
• W1970574464 creator A5090559397 @default.
• W1970574464 date "1988-01-01" @default.
• W1970574464 modified "2023-09-23" @default.
• W1970574464 title "Phosphatidylinositol cycle and its possible involvement in the regulation of cytoskeleton-membrane interactions" @default.
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• W1970574464 doi "https://doi.org/10.1002/jcb.240360103" @default.
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