Linked Life Data

18641634

Source:http://linkedlifedata.com/resource/pubmed/id/18641634

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pubmed-article:18641634pubmed:abstractTextMembrane rafts are thought to be sphingolipid- and cholesterol-dependent lateral assemblies involved in diverse cellular functions. Their biological roles and even their existence, however, remain controversial. Using an original fluorescence correlation spectroscopy strategy that recently enabled us to identify nanoscale membrane organizations in live cells, we report here that highly dynamic nanodomains exist in both the outer and inner leaflets of the plasma membrane. Through specific inhibition of biosynthesis, we show that sphingolipids and cholesterol are essential and act in concert for formation of nanodomains, thus corroborating their raft nature. Moreover, we find that nanodomains play a crucial role in triggering the phosphatidylinositol-3 kinase/Akt signaling pathway, by facilitating Akt recruitment and activation upon phosphatidylinositol-3,4,5-triphosphate accumulation in the plasma membrane. Thus, through direct monitoring and controlled alterations of rafts in living cells, we demonstrate that rafts are critically involved in the activation of a signaling axis that is essential for cell physiology.lld:pubmed
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pubmed-article:18641634pubmed:articleTitleRaft nanodomains contribute to Akt/PKB plasma membrane recruitment and activation.lld:pubmed
pubmed-article:18641634pubmed:affiliationCentre d'Immunologie de Marseille-Luminy, Université de la Méditerranée, Parc scientifique de Luminy, Case 906, F-13288 Marseille Cedex 09, France.lld:pubmed
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