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Blockade of phosphatidylinositol 3-kinase PI3Kδ or PI3Kγ reduces IL-17 and ameliorates imiquimod-induced psoriasis-like dermatitis.
Journal of Immunology 2012 November 2
Psoriasis is a chronic inflammatory skin disease triggered by interplay between immune mediators from both innate and adaptive immune systems and skin tissue, in which the IL-23/IL-17 axis is critical. PI3Kδ and PI3Kγ play important roles in various immune cell functions. We found that mice lacking functional PI3Kδ or PI3Kγ are largely protected from imiquimod (IMQ)-induced psoriasis-like dermatitis, correlating with reduced IL-17 levels in the lesions, serum, and the draining lymph nodes. TCRγδ T cells were the major IL-17-producing population in the draining lymph nodes and were significantly diminished in IMQ-treated PI3Kδ knockin and PI3Kγ knockout mice. We also show that PI3Kδ and PI3Kγ inhibitors reduced IFN-γ production by human TCRγδ T cells and IL-17 and IFN-γ production by PBMCs from psoriatic or healthy donors. In addition, inhibition of PI3Kγ, but not PI3Kδ, blocked chemotaxis of CCR6(+)IL-17-producing cells from IMQ-treated mice or healthy human donors. Taken together, these data indicate that PI3Kδ and/or PI3Kγ inhibitors should be considered for treating IL-17-driven diseases, such as psoriasis.
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