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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Cell Line, Tumor, Cell Proliferation, Down-Regulation, Humans, MicroRNAs, Neoplasm Metastasis, Osteosarcoma, Real-Time Polymerase Chain Reaction, Transfection, Tumor Suppressor Proteins, Up-Regulation.
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Does [ miR-181a promote the proliferation and metastasis of osteosarcoma cells by targeting RASSF1A ]? Context: To investigate the role of miR-181a in promoting the proliferation and metastasis of osteosarcoma cells by targeting RASSF1A.  The level of miR-181a in 30 human osteosarcoma tissues and corresponding bone tissues was detected by real-time PCR, and the correlation between the level of miR-181a and clinicopathological characteristics of osteosarcoma was analyzed. Osteosarcoma cells MG-63 were transfected with chemically-synthesized miR-181a mimics and inhibitors, and the proliferation, migration and invasion of MG-63 cells were detected by MTT and Transwell assay. The specific binding ability of miR-181a to RASSF1A 3'-UTR was theoretically predicted and detected by the dual luciferase reporter gene assay.  The level of miR-181a in osteosarcoma tissues was statistically higher than that in the corresponding bone tissues (P<0.001). However, the level of miR-181a was not correlated with gender, age, tumor size and stage (P>0.05). MTT and Transwell assays showed that the growth rate, migration and invasion ability of MG-63 cells with up-regulation of miR-181a was significantly increased compared with negative control (P<0.05), while the growth rate, migration and invasion ability of MG-63 with down-regulated miR-181a was significantly decreased compared with negative control (P<0.05). Luciferase reporter gene assay showed that miR-181a targeted the 3'-UTR of RASSF1A and regulated the expression of RASSF1A. 
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MiR-181a promotes the proliferation and metastasis of osteosarcoma cells through specifically binding to RASSF1A 3'-UTR and subsequent down-regulation of RASSF1A. Final Decision: yes