YAP1 and IGF2BP3 regulate each other during fetal programming.

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YAP1 and IGF2BP3 regulate each other during fetal programming. YAP1 and IGF2BP3 regulate each other during fetal programming. (A) qRT-PCR analysis for YAP1 and IGF2BP3 in Hep3B treated for 24 or 48 hours with 2 or 10 µM of a pharmacological inhibitor of YAP1 activity, verteporfin (VP), or 0.1% DMSO as a vehicle control (Veh). (B) Immunoblots for YAP1, IGF2BP3 and β-actin in Veh-treated or VP-treated Hep3B (2 or 10 µM). Representative blots are shown among three independent blots with similar results. The mean±SEM results of band densitometry of all blots are shown in online supplementary figure S9. (C) Immunofluorescence staining for YAP1 and IGF2BP3 (green) in Hep3B treated with Veh or VP (2 or 10 µM) for 24 hours. White-coloured arrows indicate the nuclear localisation of YAP1. Nuclei were counterstained with DAPI (blue). Representative images are shown. Scale bar=20 µm. (D) qRT-PCR analysis for let-7a, c, e, f, g-5p in Veh-treated or VP-treated Hep3Bs. All qRT-PCR data are graphed as mean±SEM results from triplicate experiments (n=3 repeats/group/time, *p<0.05, **p<0.005). (E) Immunoblots for AFP, SOX9, CCNE1, CCNB1 and β-actin in Veh-treated or VP-treated Hep3B. Representative blots are shown among three independent blots with similar results. The mean±SEM results of band densitometry for all blots are displayed in online supplementary figure S9C. (F) Cell viability/proliferation was assessed by Cell Counting Kit-8 (CCK8) assay in Hep3B treated with either Veh or VP. The mean±SEM results are graphed (n=6 repeats/group/time, **p<0.005). (G) Sphere formation assay in Hep3B treated with Veh or VP (2 or 10 µM). The number and size of spheres were analysed after 14 days of culture. The mean±SEM results from triplicate experiments are graphed (n=3 repeats/group, **p<0.005). Representative images are shown. Upper panel: 40× magnification; lower panel: 100× magnification; scale bar=250 µm. Statistical significance of all differences was assessed using two-tailed Student’s t-test. (H) Immunoblots for IGF2BP3, SOX9, CCNB1, YAP1, ESRP2 and β-actin in Hep3B treated with 2 µM of VP for 24 hours 1 day after treatment with either empty vector (Empty) or pDESTmycIGF2BP3 vector (IGF2BP3 DNA). Representative blots are shown among three independent blots with similar results. The mean±SEM results of band densitometry for all blots are displayed, and statistical analysis was assessed using two-tailed Student’s t-test compared with empty vector-treated Hep3B (n=3 repeats/group, *p<0.05, **p<0.005). (I) Putative model of post-transcriptional mechanisms regulating the phenotype of adult hepatocytes by YAP1, ESRP2, let7 and IGF2BP3. DAPI, 4′,6-diamidino-2-phenylindole; DMSO, dimethyl sulfoxide; IGF2BP3, Insulin-like growth factor-2 RNA-binding protein-3; qRT-PCR, quantitative reverse transcription-PCR; YAP1, Yes-associated protein-1.  Jeongeun Hyun et al. Gut 2019;68:1076-1087 Copyright © BMJ Publishing Group Ltd & British Society of Gastroenterology. All rights reserved.