UCN‐01 inhibits lung fibrosis via regulation of FoxO3

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UCN‐01 inhibits lung fibrosis via regulation of FoxO3 UCN‐01 inhibits lung fibrosis via regulation of FoxO3 A–CLung function measurements of mice, (A) total lung capacity, (B) lung compliance, and (C) tissue resistance.DHydroxyproline levels in mice lungs.E, FStimulation with TGF‐β1 (10 ng/ml) in the presence or absence of UCN‐01 (50 nM) for 24 h, followed by (E) Western blotting for p‐FoxO3 (Thr32), FoxO3, AKT, GAPDH, and (F) qPCRs for COL1A1 and COL3A1 (n = 3).GModel of signaling events involving FoxO3 during IPF pathogenesis. In lung fibroblasts, FoxO3 with nuclear localization leads to transcription of genes involved in regulation of apoptosis, migration, differentiation, and cell‐cycle inhibition. Pro‐fibrotic factors (TGF‐β1, IGF‐1, PDGF‐BB) bind to their receptors and activate PI3K, followed by phosphorylation of AKT. AKT phosphorylates and thereby inactivates FoxO3, followed by nuclear exclusion and degradation of FoxO3, resulting in progression of lung fibrosis. UCN‐01 inhibits AKT phosphorylation resulting in FoxO3 reactivation and attenuation of disease progression. Transforming growth factor β receptor (TGF‐βR), transforming growth factor β1 (TGF‐β1), platelet‐derived growth factor receptor (PDGFR), platelet‐derived growth factor‐BB (PDGF‐BB), insulin‐like growth factor receptor (IGFR), and insulin‐like growth factor‐1 (IGF‐1).Data information: Data are expressed as mean ± SEM. In (A–C), WT saline (n = 13 mice), Foxo3−/− saline mice (n = 6 mice), WT bleomycin vehicle‐treated (n = 14 mice), Foxo3−/− bleomycin vehicle‐treated mice (n = 7 mice), WT bleomycin‐UCN‐01 7.5 mg/kg.bw (n = 11 mice), Foxo3−/− bleomycin‐UCN‐01 7.5 mg/kg.bw mice (n = 5 mice). (D) Collagen deposition: WT saline (n = 4 mice), Foxo3−/− saline mice (n = 6 mice), WT bleomycin vehicle‐treated (n = 5 mice), Foxo3−/− bleomycin vehicle‐treated mice (n = 6 mice), WT bleomycin‐UCN‐01 7.5 mg/kg.bw (n = 5 mice), Foxo3−/− bleomycin‐UCN‐01 7.5 mg/kg.bw mice (n = 5 mice). Data in (A–D) were analyzed using one‐way ANOVA, *P < 0.05, **P < 0.01, and ***P < 0.001 versus WT saline mice; #P < 0.05 versus WT bleomycin‐UCN‐01 mice; §§§P < 0.001 versus WT bleomycin‐UCN‐01 mice. Data in (E and F) were analyzed using one‐way ANOVA, *P < 0.05, ***P < 0.001 versus TGF‐β1‐EV and §P < 0.05 versus UCN‐01‐EV. Hamza M Al‐Tamari et al. EMBO Mol Med. 2017;emmm.201606261 © as stated in the article, figure or figure legend