Psoriatic arthritis (PsA) is a chronic inflammatory arthritis and considered to be a less severe condition than rheumatoid arthritis. PsA patients have been treated for a long time with a number of different agents, from non-steroidal anti-inflammatory drugs to one or more disease-modifying antirheumatic drugs. In the last decade, recognition of the central role of tumor necrosis factor-alpha (...

Interleukin (IL)-23 is a proinflammatory cytokine belonging to the IL-12 superfamily. The antitumor activity of IL-23 is controversial, and it is unknown whether or not the cytokine can act directly on tumor cells. The aim of this study was to investigate the potential direct antitumor activity of IL-23 in pediatric B-acute lymphoblastic leukemia (B-ALL) cells and to unravel the molecular mecha...

Naïve CD4+ T helper cells can differentiate into Th1, Th2, Th17, T regulatory, Th9 and Th22 cells. Th1 cells are characterized by their production of IFNγ but not IL-4 and IL-5 while Th2 cells are characterized by their expression of IL-4 and IL-5 but not IFNγ. T-bet and GATA3 are the master transcription factors for Th1 and Th2 cells, respectively [1]. Th1 cells mediate cellular immunity again...

IL-23 is a key driver of pathogenic Th17 cell responses. It has been suggested that the transcription factor T-bet is required to facilitate IL-23-driven pathogenic effector functions; however, the precise role of T-bet in intestinal T cell responses remains elusive. Here, we show that T-bet expression by T cells is not required for the induction of colitis or the differentiation of pathogenic ...

BACKGROUND Although phenotypic heterogeneity of psoriasis is suggested by the alternate activation of either T-helper (Th)1-related or Th17-related cytokines, little is known about the mRNA levels of inflammatory cytokines. OBJECTIVE To investigate whether there is differential expression of Th1-related and Th17-related inflammatory cytokine genes 1) between psoriatic patients and healthy con...

IL-17 production defines Th17 cells, which orchestrate immune responses and autoimmune diseases. Human Th17 cells can be efficiently generated with appropriate cytokines from precommitted precursors, but the requirements of uncommitted T cells are still ill defined. In standard human Th17 cultures, IL-17 production was restricted to CCR6(+)CD45RA(+) T cells, which expressed CD95 and produced IL...

We and others have shown that the minor, nonconserved allele Gln381 of the Arg381Gln single-nucleotide polymorphism (rs11209026G>A) of the IL-23 receptor gene (IL23R) protects against psoriasis. Moreover, we have recently shown impaired IL-23-induced IL-17A production and STAT-3 phosphorylation in Th17 cells generated in vitro from healthy individuals heterozygous for the protective A allele (G...