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Sökning: L773:0014 2980 OR L773:1521 4141

  • Resultat 31-40 av 498
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  • Badolati, Isabella, et al. (författare)
  • Staphylococcus aureus-derived factors promote human Th9 cell polarization and enhance a transcriptional program associated with allergic inflammation
  • 2023
  • Ingår i: European Journal of Immunology. - : Wiley. - 0014-2980 .- 1521-4141. ; 53:3
  • Tidskriftsartikel (refereegranskat)abstract
    • T helper (Th) 9 cells, characterized by robust secretion of IL-9, have been increasingly associated with allergic diseases. However, whether and how Th9 cells are modulated by environmental stimuli remains poorly understood. In this study, we show that in vitro exposure of human PBMCs or isolated CD4 T-cells to Staphylococcus (S.) aureus-derived factors, including its toxins, potently enhances Th9 cell frequency and IL-9 secretion. Furthermore, as revealed by RNA sequencing analysis, S. aureus increases the expression of Th9-promoting factors at the transcriptional level, such as FOXO1, miR-155, and TNFRSF4. The addition of retinoic acid (RA) dampens the Th9 responses promoted by S. aureus and substantially changes the transcriptional program induced by this bacterium, while also altering the expression of genes associated with allergic inflammation. Together, our results demonstrate a strong influence of microbial and dietary factors on Th9 cell polarization, which may be important in the context of allergy development and treatment.
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  • Bemark, Mats, et al. (författare)
  • Diverse transcription factors are involved in the quantitative regulation of transcriptional activation of κ promoters
  • 1997
  • Ingår i: European Journal of Immunology. - : Wiley. - 0014-2980 .- 1521-4141. ; 27:6, s. 1308-1318
  • Tidskriftsartikel (refereegranskat)abstract
    • Immunoglobulin κ promoters show sequence divergence but conserved function between different subgroups. Here we show that three separate 5' elements are required for synergistic stimulation of transcription with the decamer in a κ promoter. These sites are a 5' E-box, a 3' AT-rich region in the pentadecamer (pd) element, and the κ-Y element. Elf-1 is a novel κ-Y element ligand induced upon mitogenic stimulation of resting B lymphocytes. Furthermore, the 5' E2A-like E-box in the pd element could be substituted by an upstream stimulatory factor motif with conservation of function. Thus, the synergistic activation requirements of κ transcription is strictly dependent on the quantitative presence of transcription factor-binding motifs 5' of the decamer, but these differ qualitatively in that they may bind an array of proteins with conserved function.
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  • Berntman, Emma, et al. (författare)
  • The role of CD1d-restricted NK T lymphocytes in the immune response to oral infection with Salmonella typhimurium.
  • 2005
  • Ingår i: European Journal of Immunology. - : Wiley. - 1521-4141 .- 0014-2980. ; 35:7, s. 2100-2109
  • Tidskriftsartikel (refereegranskat)abstract
    • CD1d-restricted natural killer T (NKT) cells belong to the innate-like lymphocytes which respond rapidly to stress and infectious challenge. We have studied murine CD1d-restricted NKT cells in the early immune response to virulent Salmonella enterica serovar Typhimurium after oral infection. In the liver and spleen, neutrophil and macrophage numbers had increased several-fold by day 5 post-infection, while the frequency of B and T lymphocytes decreased. These cellular changes occurred independently of CD1d-restricted NKT cells, and further, CD1d-restricted T cells did not influence the bacterial load. However, in CD1d+ mice NK1.1+ T cells and invariant CD1d-restricted T cells were activated by the infection, as demonstrated by an increase in size, up-regulation of CD69 and production of IFN-. The NK1.1 antigen was down-modulated on these cells during the course of infection, while TCR levels were unaffected. While dendritic cells (DC) up-regulated CD1d-levels upon 24 h of in vitro exposure to the bacteria, increased CD1d expression was not evident on DC in vivo during infection. Furthermore, in vitro re-stimulation of CD1d-restricted T cells isolated from infected mice demonstrated a significant skewing of the cytokine profile, with suppressed IL-4 and increased IFN- production.
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