RT Journal Article SR Electronic T1 Dual Inhibition of Interleukin-23 and Interleukin-17 Offers Superior Efficacy in Mouse Models of Autoimmunity JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 152 OP 165 DO 10.1124/jpet.115.224246 VO 354 IS 2 A1 Paul R. Mangan A1 Linhui Julie Su A1 Victoria Jenny A1 Andrea L. Tatum A1 Caryn Picarillo A1 Stacey Skala A1 Noah Ditto A1 Zheng Lin A1 XiaoXia Yang A1 Pete Z. Cotter A1 David J. Shuster A1 Yunling Song A1 Virna Borowski A1 Rochelle L. Thomas A1 Elizabeth M. Heimrich A1 Brigitte Devaux A1 Ruchira Das Gupta A1 Irvith Carvajal A1 Kim W. McIntyre A1 Jenny Xie A1 Qihong Zhao A1 Mary Struthers A1 Luisa M. Salter-Cid YR 2015 UL http://jpet.aspetjournals.org/content/354/2/152.abstract AB Therapies targeting either interleukin (IL)-23 or IL-17 have shown promise in treating T helper 17 (Th17)–driven autoimmune diseases. Although IL-23 is a critical driver of IL-17, recognition of nonredundant and independent functions of IL-23 and IL-17 has prompted the notion that dual inhibition of both IL-23 and IL-17 could offer even greater efficacy for treating autoimmune diseases relative to targeting either cytokine alone. To test this hypothesis, we generated selective inhibitors of IL-23 and IL-17 and tested the effect of either treatment alone compared with their combination in vitro and in vivo. In vitro, using a novel culture system of murine Th17 cells and NIH/3T3 fibroblasts, we showed that inhibition of both IL-23 and IL-17 completely suppressed IL-23–dependent IL-22 production from Th17 cells and cooperatively blocked IL-17–dependent IL-6 secretion from the NIH/3T3 cells to levels below either inhibitor alone. In vivo, in the imiquimod induced skin inflammation model, and in the myelin oligodendrocyte glycoprotein peptide–induced experimental autoimmune encephalomyelitis model, we demonstrated that dual inhibition of IL-17 and IL-23 was more efficacious in reducing disease than targeting either cytokine alone. Together, these data support the hypothesis that neutralization of both IL-23 and IL-17 may provide enhanced benefit against Th17 mediated autoimmunity and provide a basis for a therapeutic strategy aimed at dual targeting IL-23 and IL-17.