Journal
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR AND CELL BIOLOGY OF LIPIDS
Volume 1821, Issue 4, Pages 618-626Publisher
ELSEVIER
DOI: 10.1016/j.bbalip.2012.01.008
Keywords
Diacylglycerols; T-cells; Fatty acids; Lipids; Calcium channels; Calcium signaling; TRPC3; TRPC6; shRNA
Funding
- Junta de Castilla y Leon [BU001A09]
- M.E.C.
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Though most of the studies have focused on the effects of free fatty acids on T-cell activation, fatty acids incorporated into plasma membrane phospholipids may also affect cell signaling via diacylglycerol (DAG), generally produced by phospholipid hydrolysis. In the present study, we have synthesized a DAG-containing oleic acid and studied its implication in the modulation of calcium signaling in human Jurkat T-cells. 1-palmitoyl-2-oleoyl-sn-glycerol (POG) induced a dose-dependent increase in [Ca2+](i). This effect was due to the presence of oleic acid at the sn-2 position as no differences were observed between POG and 1-stearoly-2-oleoyl-sn-glycerol (SOG). However, the substitution of oleic acid with arachidonic acid at the sn-2 position of the DAG moiety exerted a different response on the increases in [Ca2+](i) in these cells. POG-evoked increases in [Ca2+](i) were not due to its metabolites. Furthermore, POG-induced increases in [Ca2+](i) were due to the opening of TRPC3/TRPC6 channels as silencing of TRPC3 and TRPC6 genes by shRNA abolished calcium entry. Moreover, disruption of lipid rafts with methyl-beta-cyclodextrin completely abolished POG-evoked increases in [Ca2+](i). In conclusion, our results demonstrate that oleic acid can influence T-lymphocyte functions, in the conjugated form of DAG, via opening TRPC3/6 channels. (C) 2012 Elsevier B.V. All rights reserved.
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