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Browse 478 clinical trials for psoriasis. Find studies that match your criteria and connect with research centers.
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NCT03718884
This study is known as a "drug interaction study." The purpose is to learn how commonly used drugs or substances (midazolam, warfarin, dextromethorphan, omeprazole, and caffeine) and their breakdown products get into the bloodstream after taking a "cocktail" (combination) of them before and after multiple doses of mirikizumab. The study will last about 23 weeks for each participant. Screening must be completed within 4 weeks prior to study start.
NCT06213688
Introduction Pollution is a significant public health issue. Research has shown a positive correlation between air pollution and chronic inflammatory dermatoses, including psoriasis and eczema. The incidence of these diseases has been steadily increasing since the beginning of industrialization. The mechanism behind this association involves the activation of the aromatic hydrocarbon receptor (AhR). The aryl hydrocarbon receptor (AhR) plays a role in regulating the balance between T helper 17 (TH17) and regulatory T cells (TREG), as well as in generating oxidative stress and producing pro-inflammatory cytokines. Studies in cultured keratinocytes have shown that a non-competitive antagonist that modulates AhR activity can reduce cutaneous inflammatory processes induced by polycyclic aromatic hydrocarbons (PAHs). Objectives: It has been suggested that activation of the AhR by PAHs and dioxins may be related to the pathogenesis of atopic dermatitis and psoriasis. The main objective is to compare the levels of AhR pathway activation markers between cases and controls. Secondary objectives include correlating environmental exposure to AhR ligands with disease severity in patients. Finally, we will compare the expression of inflammatory and AhR activation markers in cultured peripheral blood mononuclear cells (PBMCs) after in vitro stimulation with benzo(a)pyrene. Material and methods: The study will measure exposure to pollutants by determining blood dioxins and urinary PAH metabolites. Pro-inflammatory cytokines IL1β, TNFα, IL23, IL17 and IFNγ and Malondialdehyde (MDA) serum concentrations will be measured by ELISA. The TREG and TH17 lymphocyte population ratio will be evaluated by flow cytometry on isolated PBMCs. Additionally, the level of expression of CYP 1A1 and 1B1, pollutant-metabolizing enzymes induced by AhR, will be assessed on isolated PBMCs. The expression levels of the AhR and NfkB active fractions will be determined by immunofluorescence. Subsequently, levels of AhR activation markers will be compared after stimulation of PBMCs with benzo(a)pyrene.