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Inhibitory Kappa B Kinase α (IKKα) Inhibitors That Recapitulate Their Selectivity in Cells against Isoform-Related Biomarkers

Anthony, NG and Baiget, J and Berretta, G and Boyd, M and Breen, D and Edwards, J and Gamble, C and Gray, AI and Harvey, AL and Hatziieremia, S and Ho, KH and Huggan, JK and Lang, S and Llona-Minguez, S and Luo, JL and McIntosh, K and Paul, A and Plevin, RJ and Robertson, MN and Scott, R and Suckling, CJ and Sutcliffe, OB and Young, LC and Mackay, SP (2017) Inhibitory Kappa B Kinase α (IKKα) Inhibitors That Recapitulate Their Selectivity in Cells against Isoform-Related Biomarkers. Journal of Medicinal Chemistry, 60 (16). pp. 7043-7066. ISSN 0022-2623

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Abstract

© 2017 American Chemical Society. IKKβ plays a central role in the canonical NF-kB pathway, which has been extensively characterized. The role of IKKα in the noncanonical NF-kB pathway, and indeed in the canonical pathway as a complex with IKKβ, is less well understood. One major reason for this is the absence of chemical tools designed as selective inhibitors for IKKα over IKKβ. Herein, we report for the first time a series of novel, potent, and selective inhibitors of IKKα. We demonstrate effective target engagement and selectivity with IKKα in U2OS cells through inhibition of IKKα-driven p100 phosphorylation in the noncanonical NF-kB pathway without affecting IKKβ-dependent IKappa-Bα loss in the canonical pathway. These compounds represent the first chemical tools that can be used to further characterize the role of IKKα in cellular signaling, to dissect this from IKKβ and to validate it in its own right as a target in inflammatory diseases.

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