The in vitro and vivo anti-tumor effects and molecular mechanisms of suberoylanilide hydroxamic acid (SAHA) and MG132 on the aggressive phenotypes of gastric cancer cells
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Hang Lu1, Xue-feng Yang1, Xiao-qing Tian1, Shou-long Tang1, Lian-qian Li2, Shuang Zhao1, Hua-chuan Zheng1,3
1Cancer Center, The Key Laboratory of Brain and Spinal Cord Injury of Liaoning Province, and Laboratory Animal Center, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
2Department of Surgery, Panjin Central Hospital, Panjin, China
3Life Science Institute of Jinzhou Medical University, Jinzhou, China
Hua-chuan Zheng, email: firstname.lastname@example.org
Keywords: gastric cancer, suberoylanilide hydroxamic acid, MG132, aggressive phenotypes, chemotherapy
Received: April 17, 2016 Accepted: June 03, 2016 Published: July 18, 2016
Here, we found that both SAHA and MG132 synergistically inhibited proliferation, glycolysis and mitochondrial oxidization, induced cell cycle arrest and apoptosis in MGC-803 and MKN28 cells. SAHA increased cell migration and invasionat a low concentration. SAHA induced the overexpression of acetyl histone 3 and 4, which were recruited to p21, p27, Cyclin D1, c-myc and nanog promoters to transcriptionally up-regulate the former two and down-regulate the latter three. The expression of acetyl-histone 3 and 4 was increased during gastric carcinogenesis and positively correlated with cancer differentiation. SAHA and MG132 exposure suppressed tumor growth by inhibiting proliferation and inducing apoptosis in nude mice, increased serum ALT and AST levels and decreased hemaglobin level, white blood cell and neutrophil numbers. These data indicated that SAHA and MG132 in vivo and vitro synergistically induced cytotoxicity and apoptosis, suppressed proliferation, growth, migration and invasion of gastric cancer cells. Therefore, they might potentially be employed as chemotherapeutic agents if the hepatic injury and the killing effects of peripheral blood cells are avoided or ameliorated.
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