title: miR-145 inhibits proliferation and migration of breast cancer cells by directly or indirectly regulating TGF-β1 expression.
abstract: Studies have demonstrated low expression of miR-145 associated with cell proliferation and migration in a wide variety of tumors. Here, we studied the expression of miR-145 in relation to the occurrence and development of breast cancer. Total RNA from breast cancer tissue and corresponding adjacent normal tissue was extracted and used to detect miR-145 expression by quantitative real-time polymerase chain reaction (qRT-PCR). We also transfected breast cancer cells with hsa-miR-145 mimics, hsa-miR-145 inhibitor, mimics negative control (mimics NC) or inhibitor negative control (inhibitor NC). Cell proliferation was analyzed by colony formation assays and methyl thiazolyl tetrazolium assays. Cell proliferation in breast cancer cells was decreased after overexpression of miR-145 and increased following miR-145 suppression. Cell migration and invasion were assessed using Transwell and wound healing assays, respectively, and were also decreased after overexpression of miR-145 and increased after miR-145 suppression in breast cancer cells. Finally, western blot assays showed that overexpression of miR-145 inhibited expression of transforming growth factor-β1 (TGF-β1). Collectively, these data suggest that miR-145 may inhibit TGF-β1 protein expression which may in turn contribute to tumor formation.
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Yanling
authors.initials: Y
authors.lastname: Ding
authors.affiliation: The Second People's Hospital of Kunshan, Kunshan, Jiangsu 215300, P.R. China.
authors.forename: Chunfu
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Jiahui
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Nannan
authors.initials: N
authors.lastname: Zhang
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Fang
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Feiyang
authors.initials: F
authors.lastname: Zuo
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Zehua
authors.initials: Z
authors.lastname: Tao
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Shengnan
authors.initials: S
authors.lastname: Tang
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhu
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Huabiao
authors.initials: H
authors.lastname: Chen
authors.affiliation: School of Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Sun
mesh_terms: D017209:Apoptosis / Q000235:genetics; D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D002465:Cell Movement / Q000235:genetics; D049109:Cell Proliferation / Q000235:genetics*; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D061986:MCF-7 Cells; D035683:MicroRNAs / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics*; D009361:Neoplasm Invasiveness / Q000235:genetics; D053773:Transforming Growth Factor beta1 / Q000096:biosynthesis* / Q000235:genetics
chemical_list: C541010:MIRN145 microRNA, human; D035683:MicroRNAs; C508960:TGFB1 protein, human; D053773:Transforming Growth Factor beta1