Bintig , Willem; Begandt , Daniela; Schlingmann , Barbara; Gerhard , Linda; Pangalos , Maria; Dreyer , Lutz; Hohnjec , Natalija; Couraud , Pierre-Olivier; Romero, Ignacio A; Weksler, Babette B. and Ngezahayo , Anaclet
Purine receptors and Ca2+ signalling in the human blood-brain barrier endothelial cell line hCMEC/D3.
Purinergic Signalling, 8(1),
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The expression and physiology of purine receptors
of the human blood–brain barrier endothelial cells were
characterised by application of molecular biological, genesilencing and Ca2+-imaging techniques to hCMEC/D3 cells. Reverse transcription polymerase chain reaction showed the expression of the G-protein-coupled receptors P2Y2-, P2Y6-, P2Y11- as well as the ionotropic P2X4-, P2X5- and P2X7-receptors. Fura-2 ratiometry revealed that adenosine triphosphate (ATP) or uridine triphosphate (UTP) mediated a change in the intracellular Ca2+ concentratio ([Ca2+]i) from 150 to 300 nM in single cells. The change in [Ca2+]i corresponded to a fourfold to fivefold increase in
the fluorescence intensity of Fluo-4, which was used for
high-throughput experiments. Pharmacological dissection
using different agonists [UTPγS, ATPγS, uridine diphosphate
(UDP), adenosine diphosphate (ADP), BzATP, αβ-meATP] and antagonist (MRS2578 or NF340) as well as
inhibitors of intracellular mediators (U73122 and 2-APB)showed a PLC-IP3 cascade-mediated Ca2+ release, indicating that the nucleotide-induced Ca2+ signal was mainly related to P2Y2, 6 and 11 receptors. The gene silencing of the P2Y2 receptor reduced the ATP- or UTP-induced Ca2+
signal and suppressed the Ca2+ signal mediated by P2Y6 and P2Y11 more specific agonists like UDP (P2Y6), BzATP(P2Y11) and ATPγS (P2Y11). This report identifies the P2Y2 receptor subtype as the main purine receptor involved in Ca2+ signalling of the hCMEC/D3 cells.
||2011 Springer Science+Business Media B.V.
||P2 receptors; G-protein; neurovascular unit; gene silencing; siRNA
||Science > Life, Health and Chemical Sciences
Ignacio A Romero
||19 Oct 2011 15:21
||14 Nov 2012 11:56
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