Junjie Zhao1,2,3, Xuhong Fu4, Hao Chen1,2,3, Lingqiang Min1,2,3, Jie Sun1,2,3, Jingyi Yin4, Jianping Guo5, Haojie Li1,2,3, Zhaoqing Tang1,2,3, Yuanyuan Ruan6, Xuefei Wang7,8,9, Yihong Sun1,2,3, Liyu Huang10. 1. Department of General Surgery, Zhongshan Hospital, Fudan University, 200032, Shanghai, China. 2. Cancer Center, Zhongshan Hospital, Fudan University, 200032, Shanghai, China. 3. Gastric cancer center, Zhongshan Hospital, Fudan University, 200032, Shanghai, China. 4. Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 200240, Shanghai, China. 5. Institute of Precision Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510275, China. 6. Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, 200032, Shanghai, China. yuanyuanruan@fudan.edu.cn. 7. Department of General Surgery, Zhongshan Hospital, Fudan University, 200032, Shanghai, China. wang.xuefei@zs-hospital.sh.cn. 8. Cancer Center, Zhongshan Hospital, Fudan University, 200032, Shanghai, China. wang.xuefei@zs-hospital.sh.cn. 9. Gastric cancer center, Zhongshan Hospital, Fudan University, 200032, Shanghai, China. wang.xuefei@zs-hospital.sh.cn. 10. Key Laboratory of Systems Biomedicine (Ministry of Education) and Collaborative Innovation Center of Systems Biomedicine, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 200240, Shanghai, China. huangly@sjtu.edu.cn.
Abstract
BACKGROUND: A large proportion of gastric cancer patients are susceptible to chemoresistance, while the underlying mechanism remains obscure. Stress granules (SGs) play a self-defence role for tumour cells in inhibiting chemotherapy-induced apoptosis. As an SG assembly effector, G3BP1 (Ras-GTPase-activating protein SH3 domain-binding protein) has been reported to be overexpressed in gastric cancer; thus, here we aim to explore its potent roles in gastric cancer chemoresistance. METHODS: Kaplan-Meier analysis was used to compare survival rates in gastric cancer patients with different G3BP1 expression. The influence of G3BP1 on gastric cancer cell chemoresistance and apoptosis were evaluated by in vitro and in vivo approaches. The interaction between G3BP1 and YWHAZ was assessed by immunohistochemistry, immunoprecipitation and immunofluorescence. RESULTS: G3BP1 was associated with the poor outcome of gastric cancer patients who received adjuvant chemotherapy. G3BP1 knockdown significantly increased the sensitivity of gastric cancer cells to chemotherapy drugs. Mechanically, cell apoptosis and pro-apoptotic-associated molecules were significantly elevated upon G3BP1 depletion. Gene co-expression network analyses identified YWHAZ as the critical interlayer of G3BP1; as a result, G3BP1 interacted with YWHAZ to sequester Bax into the cytoplasm. Clinically, G3BP1highYWHAZhigh gastric cancer patients displayed the worst outcome compared with other patients after chemotherapy. CONCLUSIONS: The expression of G3BP1 and YWHAZ could predict the adjuvant chemotherapy benefit in gastric cancer patients.
BACKGROUND: A large proportion of gastric cancerpatients are susceptible to chemoresistance, while the underlying mechanism remains obscure. Stress granules (SGs) play a self-defence role for tumour cells in inhibiting chemotherapy-induced apoptosis. As an SG assembly effector, G3BP1 (Ras-GTPase-activating protein SH3 domain-binding protein) has been reported to be overexpressed in gastric cancer; thus, here we aim to explore its potent roles in gastric cancer chemoresistance. METHODS: Kaplan-Meier analysis was used to compare survival rates in gastric cancerpatients with different G3BP1 expression. The influence of G3BP1 on gastric cancer cell chemoresistance and apoptosis were evaluated by in vitro and in vivo approaches. The interaction between G3BP1 and YWHAZ was assessed by immunohistochemistry, immunoprecipitation and immunofluorescence. RESULTS:G3BP1 was associated with the poor outcome of gastric cancerpatients who received adjuvant chemotherapy. G3BP1 knockdown significantly increased the sensitivity of gastric cancer cells to chemotherapy drugs. Mechanically, cell apoptosis and pro-apoptotic-associated molecules were significantly elevated upon G3BP1 depletion. Gene co-expression network analyses identified YWHAZ as the critical interlayer of G3BP1; as a result, G3BP1 interacted with YWHAZ to sequester Bax into the cytoplasm. Clinically, G3BP1highYWHAZhigh gastric cancerpatients displayed the worst outcome compared with other patients after chemotherapy. CONCLUSIONS: The expression of G3BP1 and YWHAZ could predict the adjuvant chemotherapy benefit in gastric cancerpatients.
Authors: Jaffer A Ajani; Thomas A D'Amico; Khaldoun Almhanna; David J Bentrem; Joseph Chao; Prajnan Das; Crystal S Denlinger; Paul Fanta; Farhood Farjah; Charles S Fuchs; Hans Gerdes; Michael Gibson; Robert E Glasgow; James A Hayman; Steven Hochwald; Wayne L Hofstetter; David H Ilson; Dawn Jaroszewski; Kimberly L Johung; Rajesh N Keswani; Lawrence R Kleinberg; W Michael Korn; Stephen Leong; Catherine Linn; A Craig Lockhart; Quan P Ly; Mary F Mulcahy; Mark B Orringer; Kyle A Perry; George A Poultsides; Walter J Scott; Vivian E Strong; Mary Kay Washington; Benny Weksler; Christopher G Willett; Cameron D Wright; Debra Zelman; Nicole McMillian; Hema Sundar Journal: J Natl Compr Canc Netw Date: 2016-10 Impact factor: 11.908
Authors: L Marano; K Polom; A Patriti; G Roviello; G Falco; A Stracqualursi; R De Luca; R Petrioli; M Martinotti; D Generali; D Marrelli; N Di Martino; F Roviello Journal: Eur J Surg Oncol Date: 2015-11-14 Impact factor: 4.424