S-Space College of Medicine/School of Medicine (의과대학/대학원) Dept. of Medicine (의학과) Journal Papers (저널논문_의학과)
Chemical inhibitors destabilize HuR binding to the AU-rich element of TNF-alpha mRNA
- Chae, Min-Ju; Sung, Hye Youn; Kim, Eun-Hye; Lee, Mira; Chae, Chong Hak; Park, Woong-Yang; Kim, Sunwoo; Kwak, Hojoong
- Issue Date
- EXPERIMENTAL AND MOLECULAR MEDICINE; Vol.41 11; 824-831
- anti-inflammatory agents; ELAV-Iike protein 1; lipopolysaccharides; tumor necrosis factor-alpha; quercetin; macrophages
- Hu protein R (HuR) binds to the AU-rich element (ARE) in the 3`UTR to stabilize TNF-alpha mRNA. Here, we identified chemical inhibitors of the interaction between HuR and the ARE of TNF-alpha mRNA using RNA electrophoretic mobility gel shift assay (EMSA) and filter binding assay. Of 179 chemicals screened, we identified three with a half-maximal inhibitory concentration (IC(50)) below 10 mu M. The IC(50) of quercetin, b-40, and b-41 were 1.4, 0.38, and 6.21 mu M, respectively, for binding of HuR protein to TNF-alpha mRNA. Quercetin and b-40 did not inhibit binding of tristetraprolin to the ARE of TNF-alpha mRNA. When LPS-treated RAW264.7 cells were treated with quercetin and b-40, we observed decreased stability of TNF-alpha mRNA and decreased levels of secreted TNF-alpha. From these results, we could find inhibitors for the TNF-alpha mRNA stability, which might be used advantageously for both the study for post-transcriptional regulation and the discovery of new anti-inflammation drugs.