Referenced in: none

Automatically associated channels: TRP , TRPC , TRPC3 , TRPC6

Title: Diacylglycerol-containing oleic acid induces increases in [Ca(2+)](i) via TRPC3/6 channels in human T-cells.

Authors: Celia Carrillo, Aziz Hichami, Pierre Andreoletti, Mustapha Cherkaoui-Malki, María del Mar Cavia, Souleymane Abdoul-Azize, Sara R Alonso-Torre, Naim Akhtar Khan

Journal, date & volume: Biochim. Biophys. Acta, 2012 Apr , 1821, 618-26

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/22306362

Abstract
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 [Ca(2+)](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 [Ca(2+)](i) in these cells. POG-evoked increases in [Ca(2+)](i) were not due to its metabolites. Furthermore, POG-induced increases in [Ca(2+)](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-β-cyclodextrin completely abolished POG-evoked increases in [Ca(2+)](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.