Discovery of a Gut-Restricted JAK Inhibitor for the Treatment of Inflammatory Bowel Disease

Journal of Medicinal Chemistry
Kristi A LeonardTatiana Koudriakova

Abstract

To identify Janus kinase (JAK) inhibitors that selectively target gastrointestinal tissues with limited systemic exposures, a class of imidazopyrrolopyridines with a range of physical properties was prepared and evaluated. We identified compounds with low intrinsic permeability and determined a correlation between permeability and physicochemical properties, clogP and tPSA, for a subset of compounds. This low intrinsic permeability translated into compounds displaying high colonic exposure and low systemic exposure after oral dosing at 25 mg/kg in mouse. In a mouse PK/PD model, oral dosing of lead compound 2 demonstrated dose-dependent inhibition of pSTAT phosphorylation in colonic explants post-oral dose but low systemic exposure and no measurable systemic pharmacodynamic activity. We thus demonstrate the utility of JAK inhibitors with low intrinsic permeability as a feasible approach to develop gut-restricted, pharmacologically active molecules with a potential advantage over systemically available compounds that are limited by systemic on-target adverse events.

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Citations

Feb 21, 2021·Bioorganic & Medicinal Chemistry Letters·Jiamin ZhengGe Zou
Jul 20, 2021·Journal of Medicinal Chemistry·Zhuming ZhangDavid C Evans

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