ArticleInflammation research : official journal of the European Histamine Research Society ... [et al.]2026
JAK/STAT inhibition reprograms T cell activation and metabolism in inflammatory arthritis patients.
Article in Inflammation research : official journal of the European Histamine Research Society ... [et al.], 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectivesInflammatory arthritis (IA) is a group of autoimmune diseases characterised by joint inflammation and progressive damage, thus impairing the patient's quality of life. The JAK/STAT pathway inhibitor Tofacitinib has been successfully introduced into the clinic to treat patients with IA, however its direct effect on T cell responses is widely unknown. This study aims to assess the effect of Tofacitinib on T cell activation, polyfunctionality, proliferation and metabolism.
methodsThe effect of Tofacitinib on T cells from peripheral blood, synovial fluid and synovial tissue was evaluated with multidimensional flow cytometric analysis. T cell proliferation was assessed by flow cytometry and T cell metabolism was examined by qPCR and Seahorse XF analyser. To investigate the effect of Tofacitinib on T cell polarisation, naïve T cells were differentiated into Th1, Th2 and Th17 with specific cytokine cocktails. Soluble mediators were evaluated by MSD multiplex analysis.
resultsTofacitinib significantly inhibited T helper cell activation as evidenced by a marked reduction in the frequency of PD-1/CD69/CD25-positive cells (p < 0.01). Reduced activation was consistent with impairment of pathogenic polyfunctionality of peripheral blood and synovial tissue-derived T cells. The impact of Tofacitinib on T cell plasticity was further substantiated by reduced T cell polarisation towards Th1 (p < 0.05), Th2 (p < 0.05), Th17 (p < 0.05) and a reduction in genes associated with T cell functions. The attenuation of pathogenic T cell responses is linked to metabolic adaptation, with Tofacitinib leading to a switch in metabolic capacity, mainly ascribed to the CD4
conclusionsTofacitinib strongly alters T cell responses and potentially limits T cell pathogenicity by decreasing their activation, polyfunctionality, differentiation, and metabolic potential in both the circulation and the joints of patients with inflammatory arthritis.
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