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- W2010451824 abstract "Quantitative reverse transcriptase polymerase chain reaction (RT–PCR) analysis has previously shown that the P2Y 14 receptor is expressed in peripheral immune cells including lymphocytes. Although in transfected cells the P2Y 14 receptor couples to pertussis toxin‐sensitive G i/o protein, the functional coupling of endogenously expressed P2Y 14 receptors to the inhibition of adenylyl cyclase activity has not been reported. Therefore, the primary aim of this study was to determine whether the P2Y 14 receptor is functionally expressed in murine spleen‐derived T‐ and B‐lymphocyte‐enriched populations. RT–PCR analysis detected the expression of P2Y 14 receptor mRNA in whole spleen and isolated T‐ and B‐lymphocytes. In T cells, UDP‐glucose (EC 50 =335 n M ) induced a small but significant inhibition ( circa 20%) of forskolin‐stimulated cAMP accumulation, suggesting functional coupling of endogenously expressed P2Y 14 receptors to the inhibition of adenylyl cyclase activity. In contrast, the other putative P2Y 14 receptor agonists UDP‐galactose, UDP‐glucuronic acid and UDP‐ N ‐acetylglucosamine had no significant effect alone but behaved as partial agonists by blocking UDP‐glucose responses. In B cells, UDP‐glucose (100 μ M ) had no significant effect on forskolin‐stimulated cAMP accumulation. Treatment of T cells with pertussis toxin (G i/o blocker) abolished the inhibitory effects of UDP‐glucose on forskolin‐stimulated cAMP accumulation. T‐cell proliferation in response to anti‐CD3 monoclonal antibody (1 μ g ml −1 ) was significantly inhibited by UDP‐glucose (59% inhibition; p[IC 50 ]=5.9±0.3), UDP‐ N ‐acetylglucosamine (37%; 6.1±0.3), UDP‐galactose (56%; 8.2±0.2) and UDP‐glucuronic acid (49%; 6.3±0.2). Interleukin‐2‐ (5 ng ml −1 ) induced T‐cell proliferation was also significantly inhibited by all four agonists. In summary, we have shown that the P2Y 14 receptor appears to be functionally expressed in murine spleen‐derived T‐lymphocytes. These observations suggest that UDP‐glucose and related sugar nucleotides presumably via the P2Y 14 receptor may play an important role in modulating immune function. British Journal of Pharmacology (2005) 146 , 435–444. doi: 10.1038/sj.bjp.0706322" @default.
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- W2010451824 title "Functional expression of the P2Y<sub>14</sub> receptor in murine T-lymphocytes" @default.
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- W2010451824 doi "https://doi.org/10.1038/sj.bjp.0706322" @default.
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