Liya Ma1, Gen Li1,2, Tianquan Yang3, Li Zhang1, Xinxin Wang1, Xiaowen Xu1, Hong Ni4. 1. Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, 215003, People's Republic of China. 2. Medical College of Soochow University, Suzhou, 215123, Jiangsu, People's Republic of China. 3. Department of Neurosurgery, Children's Hospital of Soochow University, Suzhou, 215003, People's Republic of China. 4. Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, 215003, People's Republic of China. nihongszu@163.com.
Abstract
PURPOSE: Among children, glioblastomas (GBMs) are a relatively common type of brain tumor. BRD4 expression was elevated in GBM and negatively correlated with the prognosis of glioma. We investigated the anti-GBM effects of a novel BRD4 inhibitor GNE987. METHODS: We evaluated the anti-tumor effect of GNE987 in vitro and in vivo by Western blot, CCK8, flow cytometry detection, clone formation, the size of xenografts, and Ki67 immunohistochemical staining, and combined ChIP-seq with RNA-seq techniques to find its anti-tumor mechanism. RESULTS: In vitro experiments showed that GNE987 significantly degraded BRD4, inhibited the proliferation of GBM cells, blocked the cell cycle, and induced apoptosis. Similarly, in vivo experiments, GNE987 also inhibited GBM growth as seen from the size of xenografts and Ki67 immunohistochemical staining. Based on Western blotting, GNE987 can significantly reduce the protein level of C-Myc; meanwhile, we combined ChIP-seq with RNA-seq techniques to confirm that GNE987 downregulated the transcription of S100A16 by disturbing H3K27Ac. Furthermore, we validated that S100A16 is indispensable in GBM growth. CONCLUSION: GNE987 may be effective against GBM that targets C-Myc expression and influences S100A16 transcription through downregulation of BRD4.
PURPOSE: Among children, glioblastomas (GBMs) are a relatively common type of brain tumor. BRD4 expression was elevated in GBM and negatively correlated with the prognosis of glioma. We investigated the anti-GBM effects of a novel BRD4 inhibitor GNE987. METHODS: We evaluated the anti-tumor effect of GNE987 in vitro and in vivo by Western blot, CCK8, flow cytometry detection, clone formation, the size of xenografts, and Ki67 immunohistochemical staining, and combined ChIP-seq with RNA-seq techniques to find its anti-tumor mechanism. RESULTS: In vitro experiments showed that GNE987 significantly degraded BRD4, inhibited the proliferation of GBM cells, blocked the cell cycle, and induced apoptosis. Similarly, in vivo experiments, GNE987 also inhibited GBM growth as seen from the size of xenografts and Ki67 immunohistochemical staining. Based on Western blotting, GNE987 can significantly reduce the protein level of C-Myc; meanwhile, we combined ChIP-seq with RNA-seq techniques to confirm that GNE987 downregulated the transcription of S100A16 by disturbing H3K27Ac. Furthermore, we validated that S100A16 is indispensable in GBM growth. CONCLUSION: GNE987 may be effective against GBM that targets C-Myc expression and influences S100A16 transcription through downregulation of BRD4.
Authors: Liang Xu; Ye Chen; Anand Mayakonda; Lynnette Koh; Yuk Kien Chong; Dennis L Buckley; Edwin Sandanaraj; See Wee Lim; Ruby Yu-Tong Lin; Xin-Yu Ke; Mo-Li Huang; Jianxiang Chen; Wendi Sun; Ling-Zhi Wang; Boon Cher Goh; Huy Q Dinh; Dennis Kappei; Georg E Winter; Ling-Wen Ding; Beng Ti Ang; Benjamin P Berman; James E Bradner; Carol Tang; H Phillip Koeffler Journal: Proc Natl Acad Sci U S A Date: 2018-05-15 Impact factor: 11.205
Authors: Chiara Pastori; Mark Daniel; Clara Penas; Claude-Henry Volmar; Andrea L Johnstone; Shaun P Brothers; Regina M Graham; Bryce Allen; Jann N Sarkaria; Ricardo J Komotar; Claes Wahlestedt; Nagi G Ayad Journal: Epigenetics Date: 2014-02-19 Impact factor: 4.528