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INH14, a Small‐Molecule Urea Derivative, Inhibits the IKKα/β‐Dependent TLR Inflammatory Response
Author(s) -
Drexel Meinrad,
Kirchmair Johannes,
SantosSierra Sandra
Publication year - 2019
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.201800647
Subject(s) - inflammatory response , derivative (finance) , chemistry , small molecule , urea , inflammation , stereochemistry , biochemistry , biology , immunology , economics , financial economics
N ‐(4‐Ethylphenyl)‐ N′‐ phenylurea (INH14) is a fragment‐like compound that inhibits the toll‐like receptor 2 (TLR2)‐mediated inflammatory activity and other inflammatory pathways (i.e., TLR4, TNF‐R and IL‐1R). In this study, we determined the molecular target of INH14. Overexpression of proteins that are part of the TLR2 pathway in cells treated with INH14 indicated that the target lay downstream of the complex TAK1/TAB1. Immunoblot assays showed that INH14 decreased IkBα degradation in cells activated by lipopeptide (TLR2 ligand). These data indicated the kinases IKKα and/or IKKβ as the targets of INH14, which was confirmed with kinase assays (IC 50 IKK α =8.97 μ m ; IC 50 IKK β =3.59 μ m ). Furthermore, in vivo experiments showed that INH14 decreased TNFα formed after lipopeptide‐induced inflammation, and treatment of ovarian cancer cells with INH14 led to a reduction of NF‐kB constitutive activity and a reduction in the wound‐closing ability of these cells. These results demonstrate that INH14 decreases NF‐kB activation through the inhibition of IKKs. Optimization of INH14 could lead to potent inhibitors of IKKs that might be used as antiinflammatory drugs.