TY - JOUR T1 - Vesnarinone Suppresses TNF<em>α</em> mRNA Expression by Inhibiting Valosin-Containing Protein JF - Molecular Pharmacology JO - Mol Pharmacol SP - 930 LP - 938 DO - 10.1124/mol.112.081935 VL - 83 IS - 5 AU - Kentaro Hotta AU - Akihiro Nashimoto AU - Eiji Yasumura AU - Masafumi Suzuki AU - Motoki Azuma AU - Yosuke Iizumi AU - Daisuke Shima AU - Ryusuke Nabeshima AU - Masaki Hiramoto AU - Akira Okada AU - Kumiko Sakata-Sogawa AU - Makio Tokunaga AU - Takumi Ito AU - Hideki Ando AU - Satoshi Sakamoto AU - Yasuaki Kabe AU - Shinichi Aizawa AU - Takeshi Imai AU - Yuki Yamaguchi AU - Hajime Watanabe AU - Hiroshi Handa Y1 - 2013/05/01 UR - http://molpharm.aspetjournals.org/content/83/5/930.abstract N2 - Vesnarinone is a synthetic quinolinone derivative used in the treatment of cardiac failure and cancer. It is also known to cause agranulocytosis as a side effect, which restricts its use, although the mechanism underlying agranulocytosis is not well understood. Here, we show that vesnarinone binds to valosin-containing protein (VCP), which interacts with polyubiquitinated proteins and is essential for the degradation of IκBα to activate nuclear factor (NF)κB. We show that vesnarinone impairs the degradation of IκBα, and that the impairment of the degradation of IκBα is the result of the inhibition of the interaction between VCP and the 26S proteasome by vesnarinone. These results suggest that vesnarinone suppresses NFκB activation by inhibiting the VCP-dependent degradation of polyubiquitinated IκBα, resulting in the suppression of tumor necrosis factor-α mRNA expression. ER -