Journal: The Journal of Clinical Investigation
Article Title: Dysregulated methylation-ubiquitination crosstalk accelerates intervertebral disc degeneration via MED12 destabilization and cGAS/STING activation
doi: 10.1172/JCI197274
Figure Lengend Snippet: ( A ) Schematic representation of the experimental design to quantify the arginine methylproteome in IVDD. ( B ) Upset plot indicating the presence of arginine methylated peptides identified in each sample. ( C ) Liquid chromatography–tandem mass spectrometry of the tryptic peptide FDPVGPLPGPNPILPGRGGPNDR identified a monomethylated residue at R504. ( D ) Methyltransferase inhibitors decrease FBXO7 methylation. GFP-tagged FBXO7 was expressed in HEK293cells, followed by treatment with increasing concentrations of the methyltransferase inhibitor AdOx. ( E ) Co-IP analysis of methylated FBXO7 in NPCs with the indicated treatment. ( F ) Co-IP analysis of FBXO7-R504me in NPCs with the indicated treatment. ( G ) Co-IP analysis of FBXO7-R504me in P2 and P8 NPCs. ( H ) IHC of the FBXO7-R504me in human NP tissue. Scale bar: 100 μm. ( I ) IF staining of FBXO7-R504me in coccygeal vertebrae from rats with the indicated treatment. Scale bars: 1 mm (left), 250 μm (right). At least 3 independent experiments were performed.
Article Snippet: To explore the effects of arginine methylation, 20 or 50 μM AdOx (MedChemExpress), a PRMT inhibitor, was used to treat NPCs or HEK293T cells.
Techniques: Methylation, Liquid Chromatography, Mass Spectrometry, Residue, Co-Immunoprecipitation Assay, Staining