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IC50: 0.16 μM for IRAK-4

IRAK inhibitor 6 is an interleukin-1 receptor associated kinase 4 (IRAK-4) inhibitor.

The interleukin-1 receptor associated kinases (IRAKs) are a family of serine/threonine kinases related with regulating cellular signalling downstream of the IL-18, IL-1 and various Toll-like receptors. IRAK-4 is reported to be essential for the activation of the intracellular signalling cascades including NFКB and MAPK pathways, which are critical for the production of inflammatory cytokines.

In vitro: A quantitative structure–activity relationship (QSAR) study of IRAK inhibitor 6 and its analogs were conducted by using the genetic algorithm and multiple linear regression (GA-MLR) method [1]. In vitro study showed that compared with its unsubstituted phenyl amide analog, the ortho-substitution with chloro, methoxy and difluoromethoxy analogs of IRAK inhibitor 6 improved potency against IRAK-4 significantly. These potency effects were additive, with the most active example in the set being IRAK inhibitor 6, in which the presence of nitrogen-linked substituents at the para position had a beneficial effect on the rate of turnover by human microsomes (20 μL/min/mg protein) [2].

Clinical trial: N/A

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