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• W2809971493 endingPage "e0199156" @default.
• W2809971493 startingPage "e0199156" @default.
• W2809971493 abstract "CRTh2 (encoded by PTGDR2) is a G-protein coupled receptor expressed by Th2 cells as well as eosinophils, basophils and innate lymphoid cells (ILC)2s. Activation of CRTh2, by its ligand prostaglandin (PG)D2, mediates production of type 2 cytokines (IL-4, IL-5 and IL-13), chemotaxis and inhibition of apoptosis. As such, the PGD2-CRTh2 pathway is considered important to the development and maintenance of allergic inflammation. Expression of CRTh2 is mediated by the transcription factor GATA3 during Th2 cell differentiation and within ILC2s. Other than this, relatively little is known regarding the cellular and molecular mechanisms regulating expression of CRTh2. Here, we show using primary human Th2 cells that activation (24hrs) through TCR crosslinking (αCD3/αCD28) reduced expression of both mRNA and surface levels of CRTh2 assessed by flow cytometry and qRT-PCR. This effect took more than 4 hours and expression was recovered following removal of activation. EMSA analysis revealed that GATA3 and NFAT1 can bind independently to overlapping sites within a CRTh2 promoter probe. NFAT1 over-expression resulted in loss of GATA3-mediated CRTh2 promoter activity, while inhibition of NFAT using a peptide inhibitor (VIVIT) coincided with recovery of CRTh2 expression. Collectively these data indicate that expression of CRTh2 is regulated through the competitive action of GATA3 and NFAT1. Though prolonged activation led to NFAT1-mediated downregulation, CRTh2 was re-expressed when stimulus was removed suggesting this is a dynamic mechanism and may play a role in PGD2-CRTh2 mediated allergic inflammation." @default.
• W2809971493 created "2018-07-10" @default.
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• W2809971493 date "2018-07-03" @default.
• W2809971493 modified "2023-10-18" @default.
• W2809971493 title "Activation of Th2 cells downregulates CRTh2 through an NFAT1 mediated mechanism" @default.
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• W2809971493 doi "https://doi.org/10.1371/journal.pone.0199156" @default.
• W2809971493 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6029763" @default.
• W2809971493 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29969451" @default.
• W2809971493 hasPublicationYear "2018" @default.
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