Interleukin-22 (IL-22) is an IL-10 family cytokine that was recently discovered to be released by T helper 17 (Th17) cells, Th22 cells, etc. Recently, there is emerging evidence that IL-22 is involved in the development and pathogenesis of psoriasis. For instance, IL-22 can inhibit keratinocyte terminal differentiation and can induce psoriasis-like epidermis alterations; serum IL-22 levels were correlated with the disease severity of psoriasis patients, and IL-22 mRNA was positively expressed in the psoriatic skin lesions, but negatively expressed in the normal controls. All these findings suggest that IL-22 may be implicated in psoriasis; therapeutics targeting IL-22 may have promise as a potential therapeutic target for treating psoriasis. In the present review, we summarize recent advances on the role of IL-22 in the pathogenesis and treatment of psoriasis.
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