title: MicroRNA-107 Promotes Proliferation, Migration, and Invasion of Osteosarcoma Cells by Targeting Tropomyosin 1.
abstract: Osteosarcoma is the most common primary bone malignancy manifested predominantly in children and young adults. Studies indicate that miR-107 is involved in the pathogenesis of osteosarcoma and that tropomyosin 1 (TPM1) acts as a tumor suppressor in many types of cancer. In this study, we analyzed the effect of miR-107 on human osteosarcoma cells and investigated the mechanism in which TPM1 is involved. miR-107 expression in human osteosarcoma tissues and cells was analyzed in quantitative real-time PCR (qRT-PCR). Human osteosarcoma (U2OS) cells were transfected with miR-107 mimic, inhibitor, or scramble controls to evaluate the effect of miR-107 on cellular migration and invasion, cell viability, and apoptosis. Cells were cotransfected with the miR-107 mimic and TPM1 3'-UTR wild-type (wt) recombinant vector or mutant type (mt) as a negative control. The binding effect of miR-107 on TPM1 3'-UTR was determined by dual-luciferase reporter assay. The expression of TPM1, apoptosis-related proteins, and signaling molecules was determined by qRT-PCR and Western blotting. The results showed that miR-107 expression was upregulated in osteosarcoma tissues and cell lines. miR-107 overexpression promoted U2OS cell viability, migration, and invasion whereas it inhibited apoptosis. miR-107 inhibitor transfection ameliorated or abolished these effects after miR-107 binding to TPM1 3'-UTR-wt regulated TPM1 expression. miR-107 in U2OS cells activated MEK/ERK and NF-κB signaling pathways via TPM1. In conclusion, miR-107 overexpression promoted U2OS cell viability, migration, and invasion via downregulation of TPM1 and might be through activating the MEK/ERK and NF-κB signaling pathways.
authors.forename: Rui
authors.initials: R
authors.lastname: Jiang
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Guangyao
authors.initials: G
authors.lastname: Liu
authors.forename: Rui
authors.initials: R
authors.lastname: Gu
authors.forename: Han
authors.initials: H
authors.lastname: Wu
mesh_terms: D017209:Apoptosis / Q000235:genetics; D001859:Bone Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000235:genetics; D006801:Humans; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism*; D016328:NF-kappa B / Q000378:metabolism; D009361:Neoplasm Invasiveness; D012516:Osteosarcoma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D014162:Transfection; D014335:Tropomyosin / Q000235:genetics / Q000378:metabolism*; D015854:Up-Regulation
chemical_list: C549045:MIRN107 microRNA, human; D035683:MicroRNAs; D016328:NF-kappa B; C490775:TPM1 protein, human; D014335:Tropomyosin