IRAK4 kinase activity transduces signaling from multiple IL-1Rs and TLRs to regulate cytokines and chemokines implicated in inflammatory diseases. As such, there is high interest in identifying selective IRAK4 inhibitors for the treatment of these disorders. We previously reported the discovery of potent and selective dihydrobenzofuran inhibitors of IRAK4. Subsequent studies, however, showed inconsistent inhibition in disease-relevant pharmacodynamic models. Herein, we describe application of a human whole blood assay to the discovery of a series of benzolactam IRAK4 inhibitors. We identified potent molecule that achieves robust in vivo inhibition of cytokines relevant to human disease.
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http://dx.doi.org/10.1021/acsmedchemlett.9b00380 | DOI Listing |
Front Immunol
January 2025
Division of Rheumatology, University of Washington, Seattle, WA, United States.
Introduction: Neutrophil activation is important in systemic lupus erythematosus (SLE). We previously demonstrated that ribonucleoprotein (RNP) immune complexes (ICs) promoted neutrophil activation in a TLR7/8-dependent manner. However, it remains unclear if this mechanism occurs in patients.
View Article and Find Full Text PDFJ Med Chem
January 2025
School of Pharmacy, Hangzhou Medical College, Hangzhou 310014, China.
Interleukin-1 receptor-associated kinase 4 (IRAK4) is involved in various inflammation-related diseases. Both the kinase and scaffolding functions of IRAK4 initiate pro-inflammatory factor transcription and expression. The scaffolding function of IRAK4 is essential for Myddosome assembly and NF-κB activation.
View Article and Find Full Text PDFNaunyn Schmiedebergs Arch Pharmacol
January 2025
Dr. Babasaheb Ambedkar Technological University, Lonere, Raigad, 402103, India.
Acute lung injury i.e. ALI and its serious form acute respiratory distress syndrome (ARDS) are incurable medical conditions associated with significant global mortality and morbidity.
View Article and Find Full Text PDFBiomolecules
November 2024
Bowles Center for Alcohol Studies, School of Medicine, University of North Carolina at Chapel Hill, 3027 Thurston Bowles Bldg., CB 7178, Chapel Hill, NC 27599, USA.
The endogenous neurosteroid (3α,5α)-3-hydroxypregnan-20-one (3α,5α-THP) modulates inflammatory and neuroinflammatory signaling through toll-like receptors (TLRs) in human and mouse macrophages, human blood cells and alcohol-preferring (P) rat brains. Although it is recognized that 3α,5α-THP inhibits TLR4 activation by blocking interactions with MD2 and MyD88, the comprehensive molecular mechanisms remain to be elucidated. This study explores additional TLR4 activation sites, including TIRAP binding to MyD88, which is pivotal for MyD88 myddosome formation, as well as LPS interactions with the TLR4:MD2 complex.
View Article and Find Full Text PDFACS Med Chem Lett
November 2024
National Center for Advancing Translational Sciences, Rockville, Maryland 20850, United States.
We report the discovery of an imidazopyridine series of IRAK1/4/pan-FLT3 kinase inhibitors. Optimization of this series has produced compound which displays potent and selective inhibition of IRAK1, IRAK4, FLT3, and all mutant forms of FLT3, as well as good in vitro ADME and pharmacokinetic properties. In a mouse xenograft model of AML, produces survival prolongation equal to that of Gilteritinib, the leading marketed FLT3 inhibitor currently used to treat AML.
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