title: miR-340 Inhibits Proliferation and Induces Apoptosis in Gastric Cancer Cell Line SGC-7901, Possibly via the AKT Pathway.
abstract: BACKGROUND Gastric cancer is among the most common types of cancer, with high morbidity and mortality. MicroRNAs (miRNAs) play vital roles in the tumorigenesis and biology of gastric cancer. This study aimed to reveal the role of miR-340 in gastric cancer cell proliferation and apoptosis and to elucidate the potential mechanisms. MATERIAL AND METHODS Human gastric cancer cells SGC-7901 were used in this study for cell transfection with miR-340 mimic or inhibitor. After transfection, cell viability, proliferation, and apoptosis were examined by MTT, BrdU, and flow cytometry assays, respectively. The protein level changes of p27, p21, Caspase 3 (CASP3), B cell lymphoma 2 (BCL2), BCL2-associated X protein (BAX), and v-AKT murine thymoma viral oncogene (AKT) were detected by Western blot. RESULTS Overexpression of miR-340 significantly reduced cell viability and proliferation (P<0.01), and induced cell apoptosis (P<0.01) of SGC-7901. miR-340 elevated the protein level of cell cycle inhibitor p27, but did not affect the level of p21. Apoptosis-related factors pro-CASP3, cleaved-CASP3, and BAX were promoted, and BCL2 was inhibited by miR-340. miR-340 also suppressed the phosphorylation of AKT. Opposite effects were detected when SGC-7901 cells were transfected with miR-340 inhibitor. CONCLUSIONS These results indicate that miR-340 can inhibit proliferation and induce apoptosis of SGC-7901 cells, suggesting its roles in protecting against gastric cancer. The roles of miR-340 in gastric cancer cells may be associated with its regulation of the AKT pathway. Thus, miR-340 may be a potential therapeutic strategy for gastric cancer treatment.
authors.affiliation: Department of Gastroenterology, Henan Province Hospital of TCM, Zhengzhou, Henan, China (mainland).
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Yu
authors.affiliation: Second Clinical Medical College, Henan University of Chinese Medicine, Zhengzhou, Henan, China (mainland).
authors.forename: Ruijie
authors.initials: R
authors.lastname: Wang
authors.affiliation: Department of Reproductive Medicine, Henan Province Hospital of TCM, Zhengzhou, Henan, China (mainland).
authors.forename: Jianshe
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Gastroenterology, Shenzhen Luohu People's Hospital, Shenzhen, Guangdong, China (mainland).
authors.forename: Jinfeng
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Gastroenterology, Henan Province Hospital of TCM, Zhengzhou, Henan, China (mainland).
authors.forename: Zhongqin
authors.initials: Z
authors.lastname: Dang
authors.affiliation: Department of Gastroenterology, Henan Province Hospital of TCM, Zhengzhou, Henan, China (mainland).
authors.forename: Qinsheng
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Gastroenterology, Henan Province Hospital of TCM, Zhengzhou, Henan, China (mainland).
authors.forename: Bo
authors.initials: B
authors.lastname: Li
mesh_terms: D017209:Apoptosis / Q000235:genetics; D059447:Cell Cycle Checkpoints / Q000235:genetics; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000235:genetics; D002470:Cell Survival / Q000235:genetics; D006801:Humans; D035683:MicroRNAs / Q000008:administration & dosage / Q000096:biosynthesis / Q000235:genetics*; D015398:Signal Transduction; D013274:Stomach Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D014162:Transfection
chemical_list: C570046:MIRN340 microRNA, human; D035683:MicroRNAs