title: Interaction of mesalasine (5-ASA) with translational initiation factors eIF4 partially explains 5-ASA anti-inflammatory and anti-neoplastic activities.
abstract: 5-Aminosalicylic acid (5-ASA or mesalazine) is widely used for treatment of inflammatory bowel disease and considered to be cancer preventive. Still, the molecular mechanisms explaining its properties remain largely unknown, partially due to the lack of instrumentarium needed to identify its array of molecular targets. Modern OMICs-based technologies utilized in this study may serve as a powerful and unbiased tool to search for such targets. Here we demonstrate that 5-ASA alters β-catenin immunocomplex formation by changing complex binding of seven proteins including translation initiation factors eIF4b. OMICs-based cross-testing by reverse in-gel chemogenomics (utilizing 5-ASA's fluorescent properties), in-silico docking and surface plasmon resonance experiments identified binding of 5-ASA to eIF4e's cap-binding pocket, a key regulatory site for protein synthesis. In-vitro translation experiments with rabbit reticulocytes confirmed a dose-dependent inhibition of protein syntheses by 5-ASA. By using two unbiased and independent OMICs-based experimental approaches two members of the cellular translation machinery, eIF4b and IF4e, were identified as targets of 5-ASA. Inhibition of protein syntheses is a previously unrecognized property of 5-ASA that may add to its anti-inflammatory and anti-neoplastic activities.
authors.affiliation: Christian Doppler Laboratory on Molecular Cancer Chemoprevention and Div. of Gastroenterology and Hepatology, Dept. Medicine, Medical University of Vienna, Vienna, Austria.
authors.forename: Alex
authors.initials: A
authors.lastname: Lyakhovich
authors.forename: Anna
authors.initials: A
authors.lastname: Michlmayr
authors.forename: Anastasia
authors.initials: A
authors.lastname: Bakulina
authors.forename: Christopher
authors.initials: C
authors.lastname: Gerner
authors.forename: Rudolf
authors.initials: R
authors.lastname: Oehler
authors.forename: Christoph
authors.initials: C
authors.lastname: Gasche
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology*; D002460:Cell Line; D039562:Eukaryotic Initiation Factor-4F / Q000037:antagonists & inhibitors / Q000378:metabolism*; D006801:Humans; D019804:Mesalamine / Q000737:chemistry / Q000494:pharmacology*; D011485:Protein Binding; D011500:Protein Synthesis Inhibitors / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013379:Substrate Specificity; D051153:Wnt Proteins / Q000378:metabolism
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000970:Antineoplastic Agents; D039562:Eukaryotic Initiation Factor-4F; D011500:Protein Synthesis Inhibitors; D051153:Wnt Proteins; D019804:Mesalamine