GNA13 as a prognostic factor and mediator of gastric cancer progression
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Jia-Xing Zhang1,2,*, Miao Yun2,3,*, Yi Xu1,*, Jie-Wei Chen4, Hui-Wen Weng1, Zou-San Zheng1, Cui Chen1, Dan Xie2, Sheng Ye1
1Department of Oncology, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, PR China
2Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, PR China
3Department of Ultrasound, Cancer Center, Sun Yat-Sen University, Guangzhou, PR China
4Department of Pathology, Cancer Center, Sun Yat-Sen University, Guangzhou, PR China
*These authors contributed equally to this work
Ye Sheng, e-mail: firstname.lastname@example.org
Dan Xie, e-mail: email@example.com
Keywords: GNA13, gastric cancer, proliferation, tumorigenicity
Received: August 06, 2015 Accepted: November 21, 2015 Published: December 28, 2015
Guanine nucleotide binding protein (G protein), alpha 13 (GNA13) has been implicated as an oncogenic protein in several human cancers. In this study, GNA13 was characterized for its role in gastric cancer (GC) progression and underlying molecular mechanisms. The expression dynamics of GNA13 were examined by immunohistochemistry (IHC) in two independent cohorts of GC samples. A series of in-vivo and in-vitro assays was performed to elucidate the function of GNA13 in GC and its underlying mechanisms. In both two cohorts of GC samples, we observed that GNA13 was markedly overexpressed in GC tissues and associated closely with aggressive magnitude of GC progression and poor patients’ survival. Further study showed that upregulation of GNA13 expression increased the proliferation and tumorigenicity of GC cells in vitro and in vivo, by promoting cell growth rate, colony formation, and tumor formation in nude mice. By contrast, knockdown of GNA13 effectively suppressed the proliferation and tumorigenicity of GC cells in vitro and in vivo. Our results also demonstrated that the molecular mechanisms of the effect of GNA13 in GC included promotion of G1/S cell cycle transition through upregulation of c-Myc, activation of AKT and ERK activity, suppression of FOXO1 activity, upregulation of cyclin-dependent kinase (CDK) regulator cyclin D1 and downregulation of CDK inhibitor p21Cip1 and p27Kip1. Our present study illustrated that GNA13 has an important role in promoting proliferation and tumorigenicity of GC, and may represent a novel prognostic biomarker and therapeutic target for this disease.
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