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• W1983263255 abstract "Abstract Although typically considered a neurotransmitter, there is substantial evidence that serotonin (5-HT) plays an important role in the pathogenesis of inflammatory disorders. Despite these findings, the precise role of 5-HT in modulating immune function, particularly T-cell function, remains elusive. We report that naive T cells predominantly express the type 7 5-HT receptor (5-HTR), and expression of this protein is substantially enhanced on T-cell activation. In addition, T-cell activation leads to expression of the 5-HT1B and 5-HT2A receptors. Significantly, exogenous 5-HT induces rapid phosphorylation of extracellular signal-regulated kinase-1 and -2 (ERK1/2) and IκBα in naive T cells. 5-HT–induced activation of ERK1/2 and NFκB is inhibited by preincubation with a specific 5-HT7 receptor antagonist. Thus, 5-HT signaling via the 5-HT7 receptor may contribute to early T-cell activation. In turn, 5-HT synthesized by T cells may act as an autocrine factor. Consistent with this hypothesis, we found that inhibition of 5-HT synthesis with parachlorophenylalanine (PCPA) impairs T-cell activation and proliferation. Combined, these data demonstrate a fundamental role for 5-HT as an intrinsic cofactor in T-cell activation and function and suggest an alternative mechanism through which immune function may be regulated by indoleamine 2,3-dioxygenase–mediated catabolism of tryptophan." @default.
• W1983263255 created "2016-06-24" @default.
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• W1983263255 date "2006-12-14" @default.
• W1983263255 modified "2023-10-17" @default.
• W1983263255 title "Serotonin provides an accessory signal to enhance T-cell activation by signaling through the 5-HT7 receptor" @default.
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• W1983263255 doi "https://doi.org/10.1182/blood-2006-10-052787" @default.
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