IL-17A, IL-22, and IL-23 as Markers of Psoriasis Activity

Introduction: T-helper 1 (Th1), Th17 cells, and their related cytokines are implicated in psoriasis pathogenesis although the contribution of each group of cytokines in psoriasis activity has not been fully clarified. Objectives: To investigate whether Th17-related cytokines are associated with psoriasis activity. Methods: The serum levels of interleukin (IL)-1β, 6, 8, 17Α, 22, 23, and tumor necrosis factor-α (TNFα) were measured with flow cytometry in 35 patients with plaque psoriasis (21 with stable and 14 with active disease) and in 20 healthy controls. Results: Interleukin-6, 8, 17A, 22, 23, and TNFα were significantly elevated in psoriasis patients compared with controls. In the sensitivity analyses, patients with active disease showed significantly increased levels of IL-17A, IL-23, and IL-22 as compared to the group of patients with stable psoriasis. Conclusions: Our study highlights a possible crucial role of IL-17A, IL-22, and IL-23 in the activity of psoriasis and the early stages of the disease.