Profiling of MicroRNA Targets Using Activity-Based Protein Profiling: Linking Enzyme Activity to MicroRNA-185 Function.
MicroRNAs (miRNAs) act as cellular signal transducers through repression of protein translation. Elucidating targets using bioinformatics and traditional quantitation methods is often insufficient to uncover global miRNA function. Herein, alteration of protein function caused by miRNA-185 (miR-185), an immunometabolic miRNA, was determined using activity-based protein profiling, transcriptomics, and lipidomics. Fluorophosphonate-based activity-based protein profiling of miR-185-induced changes to human liver cells revealed that exclusively metabolic serine hydrolase enzymes were regulated in activity, some with roles in lipid and endocannabinoid metabolism. Lipidomic analysis linked enzymatic changes to levels of cellular lipid species, such as components of very-low-density lipoprotein particles. Additionally, inhibition of one miR-185 target, monoglyceride lipase, led to decreased hepatitis C virus levels in an infectious model. Overall, the approaches used here were able to identify key functional changes in serine hydrolases caused by miR-185 that are targetable pharmacologically, such that a small molecule inhibitor can recapitulate the miRNA phenotype.
['Filip|Roxana|R|', 'Desrochers|Geneviève F|GF|', 'Lefebvre|David M|DM|', 'Reed|Alex|A|', 'Singaravelu|Ragunath|R|', 'Cravatt|Benjamin F|BF|', 'Pezacki|John Paul|JP|']
D002460:Cell Line D020869:Gene Expression Profiling D022781:Hepatocytes D006801:Humans D000081362:Lipidomics D035683:MicroRNAs D040901:Proteomics D059467:Transcriptome
microRNAs activity-based protein profiling miR-185 metabolism lipids monoglyceride lipase inhibitor antiviral microRNA signaling