Journal: Cancer Communications
Article Title: Intranuclear paraspeckle‐circular RNA TACC3 assembly forms RNA‐DNA hybrids to facilitate MASH‐related hepatocellular carcinoma growth in an m 6 A‐dependent manner
doi: 10.1002/cac2.70061
Figure Lengend Snippet: The m 6 A modification of circTACC3 regulates its interaction with NONO/p54 nrb . (A) Western blot validation of NONO/p54 nrb pulldown by F2‐circTACC3 in HCCLM3 cells. (B) RIP assay shows enrichment of circTACC3 in NONO/p54 nrb ‐associated RNA in HCCLM3 cells ( n = 4). *** P < 0.001. (C) FLIM‐FRET assay (left panel) and the schematic diagram of FLIM‐FRET (right panel) in PA and OA treated HCCLM3 and HepG2 cells. (D) CLIP assay followed by RT‐PCR gel electrophoresis in HCCLM3 cells. (E) The location of circTACC3 (red), NONO/p54 nrb (green), and LncNEAT1 (magenta) in nuclei (blue) was evaluated in HCCLM3 and HepG2 cells following PA + OA treatment. (F) The distribution of circTACC3 (red) in nuclei (blue) was assessed following NONO/p54 nrb or LncNEAT1 interference in PA and OA treated HCCLM3 and HepG2 cells, respectively. (G) Nucleo‐plasmic fractionation shows the altered intracellular localization of circTACC3 following NONO/p54 nrb and LncNEAT1 interference in PA and OA treated HCCLM3 and HepG2 cells ( n = 4). *** P < 0.001. (H) RIP assay shows the enrichment of circTACC3 in NONO/p54 nrb ‐associated RNA following indicated treatment ( n = 3) in HCCLM3 and HepG2 cells. * P < 0.05; ** P < 0.01; *** P < 0.001; NS , not significant. (I‐K) Representative fluorescence images show the distribution of circTACC3 (red) and NONO/p54 nrb (green) in nuclei (blue) in HCCLM3, HepG2 cells, and Hep3B cells expressed ectopic circTACC3 following indicated treatment. (L) RIP assay shows enrichment of wildtype/m 6 A modification site mutant circTACC3 in NONO/p54 nrb ‐associated RNA in PA and OA treated HCCLM3 and HepG2 cells. Data normalization by dividing anti‐NONO/p54 nrb RIP and IgG RIP values by their respective Input group data ( n = 3). * P < 0.05; ** P < 0.01; *** P < 0.001; NS , not significant. Abbreviations: NONO/p54 nrb , non‐POU domain‐containing octamer‐binding protein; CLIP, ultraviolet cross‐linking immunoprecipitation; RT‐PCR, reverse transcription‐PCR; FLIM‐FRET, fluorescence lifetime imaging microscopy‐forster resonance energy transfer; MFD, Minimal Fraction of Donor; PA, palmitic acid; OA, oleic acid; T, tumor tissues; PT, peritumoral normal tissue; NAS, non‐alcoholic fatty liver disease activity score; SAH, S‐adenosylhomocysteine; DAA, 3‐deazaadenosine; Mut, mutation; RIP, RNA immunoprecipitation.
Article Snippet: Then, 10 μg of NONO/p54 nrb Rabbit mAb (#10162S, Cell Signaling Technology, MA, US), or 10 μg of IgG antibody was added to the cell lysate, and the mixture was incubated overnight at 4°C.
Techniques: Modification, Western Blot, Biomarker Discovery, Reverse Transcription Polymerase Chain Reaction, Nucleic Acid Electrophoresis, Fractionation, Fluorescence, Mutagenesis, Binding Assay, Cross-linking Immunoprecipitation, Reverse Transcription, Imaging, Microscopy, Förster Resonance Energy Transfer, Activity Assay, RNA Immunoprecipitation