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• W1783335369 startingPage "6011" @default.
• W1783335369 abstract "The neurotransmitter 5-hydroxytryptamine (5-HT), commonly known as serotonin, is stored at peripheral sites in mast cells and released from this peripheral source upon IgE cross-linking. In this study, we investigated the expression of serotoninergic receptors (5-HTR), the signaling pathway, and biological activity of 5-HT on human dendritic cells (DC), showing that immature and mature DC expressed mRNA for different serotoninergic receptors. Thereby, the mRNA of 5-HTR(1B), 5-HTR(1E), 5-HTR(2A), 5-HTR(2B), one splicing variant of the 5-HTR(3), 5-HTR(4), and 5-HTR(7) receptors were detected. Immature DC preferentially expressed mRNA for the heptahelical 5-HTR(1B), 5-HTR(1E), and 5-HTR(2B) receptors, while mature DC mostly expressed 5-HTR(4) and 5-HTR(7). The mRNA expression level of the ligand-gated cation channel 5-HTR(3) and the heptahelical 5-HTR(2A) did not significantly change during maturation. Isotype-selective receptor agonists allowed us to show that 5-HT stimulated 5-HTR(3)-dependent Ca(2+) influx in immature and mature DC. Moreover, we revealed that 5-HTR(1) and 5-HTR(2) receptor stimulation induced intracellular Ca(2+) mobilization via G(i/o) proteins in immature, but not mature, DC. Activation of 5-HTR(4) and 5-HTR(7) induced cAMP elevation in mature DC. Functional studies indicated that activation of 5-HTR(4) and 5-HTR(7) enhanced the release of the cytokines IL-1beta and IL-8, while reducing the secretion of IL-12 and TNF-alpha in mature DC. In summary, our study shows that 5-HT stimulated, in a maturation-dependent manner, different signaling pathways in DC. These data point to a role for 5-HT in regulating the immune response at peripheral sites." @default.
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• W1783335369 date "2004-05-05" @default.
• W1783335369 modified "2023-10-12" @default.
• W1783335369 title "The Serotoninergic Receptors of Human Dendritic Cells: Identification and Coupling to Cytokine Release" @default.
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• W1783335369 doi "https://doi.org/10.4049/jimmunol.172.10.6011" @default.
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