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Träfflista för sökning "WFRF:(Chemin Karine) srt2:(2018)"

Sökning: WFRF:(Chemin Karine) > (2018)

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  • Chemin, Karine, et al. (författare)
  • EOMES-positive CD4+ T cells are increased in PTPN22 (1858T) risk allele carriers.
  • 2018
  • Ingår i: European Journal of Immunology. - 0014-2980 .- 1521-4141. ; 48:4, s. 655-669
  • Tidskriftsartikel (refereegranskat)abstract
    • The presence of the PTPN22 risk allele (1858T) is associated with several autoimmune diseases including rheumatoid arthritis (RA). Despite a number of studies exploring the function of PTPN22 in T cells, the exact impact of the PTPN22 risk allele on T-cell function in humans is still unclear. In this study, using RNA sequencing, we show that, upon TCR-activation, naïve human CD4+ T cells homozygous for the PTPN22 risk allele overexpress a set of genes including CFLAR and 4-1BB, which are important for cytotoxic T-cell differentiation. Moreover, the protein expression of the T-box transcription factor Eomesodermin (EOMES) was increased in T cells from healthy donors homozygous for the PTPN22 risk allele and correlated with a decreased number of naïve CD4+ T cells. There was no difference in the frequency of other CD4+ T cell subsets (Th1, Th17, Tfh, Treg). Finally, an accumulation of EOMES+CD4+ T cells was observed in synovial fluid of RA patients with a more pronounced production of Perforin-1 in PTPN22 risk allele carriers. Altogether, we propose a novel mechanism of action of PTPN22 risk allele through the generation of cytotoxic CD4+ T cells and identify EOMES+CD4+ T cells as a relevant T-cell subset in RA pathogenesis.
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3.
  • Houtman, Miranda, et al. (författare)
  • T cells are influenced by a long non-coding RNA in the autoimmune associated PTPN2 locus
  • 2018
  • Ingår i: ; 90, s. 28-38
  • Tidskriftsartikel (refereegranskat)abstract
    • Non-coding SNPs in the protein tyrosine phosphatase non-receptor type 2 (PTPN2) locus have been linked with several autoimmune diseases, including rheumatoid arthritis, type I diabetes, and inflammatory bowel disease. However, the functional consequences of these SNPs are poorly characterized. Herein, we show in blood cells that SNPs in the PTPN2 locus are highly correlated with DNA methylation levels at four CpG sites downstream of PTPN2 and expression levels of the long non-coding RNA (IncRNA) LINC01882 downstream of these CpG sites. We observed that LINC01882 is mainly expressed in T cells and that anti-CD3/CD28 activated naive CD4(+) T cells downregulate the expression of LINC01882. RNA sequencing analysis of LINC01882 knockdown in Jurkat T cells, using a combination of antisense oligo-nucleotides and RNA interference, revealed the upregulation of the transcription factor ZEB1 and kinase MAP2K4, both involved in IL-2 regulation. Overall, our data suggests the involvement of LINC01882 in T cell activation and hints towards an auxiliary role of these non-coding SNPs in autoimmunity associated with the PTPN2 locus. 
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