title: Let-7i inhibits the malignant phenotype of osteosarcoma cells by targeting Aurora-B.
abstract: Our previous study indicated that Aurora-B is involved in osteosarcoma (OS) cell invasion and metastasis; however, the mechanism underlying Aurora-B overexpression in OS remains unknown. In the present study, significantly downregulated let-7i expression in OS tissues and OS cells was observed compared with that in normal adjacent tumorous tissues and human osteoblast cell lines. Bioinformatic predictions have revealed a conserved binding site in a microRNA locus on Aurora‑B, suggesting the potential of let‑7i targeting the Aurora‑B gene. To validate this, a luciferase reporter assay was performed on OS cells. The results indicated that Aurora‑B is a likely to be a direct target negatively regulated by let‑7i. The expression of let‑7i in OS cells was restored by infection with let‑7i mimics. Results revealed that Aurora‑B mRNA and protein expression levels were significantly decreased. Furthermore, the proliferation, migration and invasion abilities of OS cells were significantly suppressed by infection with let‑7i mimics. Notably, the inhibitory effect of silencing Aurora‑B by LV‑shAurora‑B on cell proliferation, migratory and invasive ability was significantly lower than that by let‑7i mimics, which indicated that let‑7i inhibits cell malignant phenotypes partially by targeting Aurora‑B in OS cells. All data suggested that let‑7i may be a novel potential target for OS treatment.
authors.affiliation: Department of Orthopedics, The Second Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Guo Mei
authors.initials: GM
authors.lastname: Zhang
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Xin Hua
authors.initials: XH
authors.lastname: Long
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Jia Ming
authors.initials: JM
authors.lastname: Liu
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Liang Bo
authors.initials: LB
authors.lastname: Zhu
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Xuan Yin
authors.initials: XY
authors.lastname: Chen
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Shan Hu
authors.initials: SH
authors.lastname: Huang
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Zhi Hong
authors.initials: ZH
authors.lastname: Zhang
authors.affiliation: Department of Orthopedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China.
authors.forename: Zhi Li
authors.initials: ZL
authors.lastname: Liu
mesh_terms: D064107:Aurora Kinase B / Q000235:genetics*; D001859:Bone Neoplasms / Q000235:genetics* / Q000473:pathology; D001842:Bone and Bones / Q000378:metabolism / Q000473:pathology; D002465:Cell Movement; D002470:Cell Survival; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D035683:MicroRNAs / Q000235:genetics*; D009361:Neoplasm Invasiveness / Q000235:genetics / Q000473:pathology; D012516:Osteosarcoma / Q000235:genetics* / Q000473:pathology
chemical_list: D035683:MicroRNAs; C487931:mirnlet7 microRNA, human; D064107:Aurora Kinase B