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• W2142447807 abstract "Human mast cells express functional A(2A) and A(2B) adenosine receptors. However, only stimulation of A(2B), not A(2A), leads to secretion of interleukin (IL)-4, an important step in adenosine receptor-mediated induction of IgE synthesis by B-cells. In this study, we investigate intracellular pathways that link stimulation of A(2B) receptors to IL-4 up-regulation in HMC-1 mast cells. Both A(2A) and A(2B) receptors couple to G(s) proteins and stimulate adenylate cyclase, but only A(2B) stimulates phospholipase Cbeta through coupling to G(q) proteins leading to activation of protein kinase C and calcium mobilization. Inhibition of phospholipase Cbeta completely blocked A(2B) receptor-dependent IL-4 secretion. The protein kinase C inhibitor 2-{8-[(dimethylamino)-methyl]-6,7,8,9-tetrahydropyrido[1,2-a]indol-3-yl}-3-(1-methyl-1H-indol-3-yl)maleimide (Ro-32-0432) had no effect on A(2B) receptor-mediated IL-4 secretion but inhibited phorbol 12-myristate 13-acetate-stimulated IL-4 secretion. In contrast, chelation of intracellular Ca(2+) inhibited both A(2B) receptor- and ionomycin-dependent IL-4 secretion. This Ca(2+)-sensitive pathway probably includes calcineurin and nuclear factor of activated T cells, because A(2B) receptor-dependent IL-4 secretion was blocked with cyclosporin A or 11R-VIVIT peptide. G(s)-linked pathways also play a role in the A(2B) receptor-dependent stimulation of IL-4 secretion; inhibition of adenylate cyclase or protein kinase A attenuated A(2B) receptor-dependent IL-4 secretion. Although stimulation of adenylate cyclase with forskolin did not increase IL-4 secretion on its own, it potentiated the effect of Pasteurella multocida toxin by 2-fold and ionomycin by 3-fold. Both forskolin and stimulation of A(2B) receptors up-regulated NFATc1 protein levels. We conclude that A(2B) receptors up-regulate IL-4 through G(q) signaling that is potentiated via cross-talk with G(s)-coupled pathways." @default.
• W2142447807 created "2016-06-24" @default.
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• W2142447807 date "2006-05-17" @default.
• W2142447807 modified "2023-09-27" @default.
• W2142447807 title "Cross-Talk between G_s- and G_q-Coupled Pathways in Regulation of Interleukin-4 by A_2BAdenosine Receptors in Human Mast Cells" @default.
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• W2142447807 doi "https://doi.org/10.1124/mol.106.022780" @default.
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