Background:This study aimed to investigate the correlation of long intergenic noncoding RNA 511 (LINC00511) with clinicopathological characteristics and overall survival (OS) in osteosarcoma patients and to explore its function in osteosarcoma in vitro and in vivo.
Methods:Tumor tissues and adjacent tissues from 45 osteosarcoma patients were acquired, and LINC00511 expression was detected. In vitro, LINC00511 expression was detected in osteosarcoma cell lines and osteoblast cell line. LINC00511 overexpression-treated (OE-LINC00511) and nonsense overexpression-treated (OEcontrol) MG-63 and Saos-2 cells were cultured, followed by the assessment of cell proliferation, apoptosis, migration, and invasion. In vivo, tumor weight and volume were measured in OE-LINC00511 and OE-control xenografted mice.Results: LINC00511 expression was decreased in tumor tissues compared with adjacent tissues (P < .001), and its high expression correlated with increased tumor cell necrosis rate to neoadjuvant chemotherapy (P = .025) and prolonged OS (P = .010).In vitro, LINC00511 expression was decreased in osteosarcoma cell lines (including MG-63, U-2OS, Saos-2, and HOS) compared with osteoblast cell line (All P < .001).Cell proliferation was decreased at 48 hours (Both P < .01) and 72 hours (Both P < .001) (in MG-63 and Saos-2 cells); cell apoptosis was increased (P < .05) (in Saos-2 cells); cell migration and invasion were decreased (All P < .01) (in MG-63 cells and Saos-2 cells) in OE-LINC00511 compared with OE-control. In vivo, tumor volume was reduced at week 4 (P < .001), week 5 (P < .001), week 6 (P < .001) in OE-LINC00511 compared with OE-control. Tumor weight was declined in OE-LINC00511 than OEcontrol (P < .001).
Conclusions: LINC00511 acts as a potential biomarker and therapeutic option for
osteosarcoma.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.(HD-MTX) 10-12 g/m 2 intravenous drip within 5 hours, followed by intravenous injection of sodium folinate at 6 hours, 12 hours, 18 hours, 24 hours, 30 hours, 36 hours, 42 hours, 48 hours, 54 hours, 60 hours, 66 hours, and 72 hours (the complete of HD-MTX intravenous drip was defined as 0 hour), meanwhile, MTX concentration in plasma was monitored at 0 hour, 12 hours, 24 hours, 48 hours, and 72 hours; Day 8: adriamycin (ADM) 20 mg/m 2 /d × 3 days intravenous drip; Day 11: cisplatin (DDP) 120 mg/m 2 intravenous drip; Day 21: ifosfamide (IFO) 2 g/m 2 /d × 5 days intravenous drip, using Mesna to prevent hemorrhagic cystitis. Each cycle repeated every 3 weeks. A total of two cycles of IOR-OS/N-5 regimen were given to patients before surgery. When the neoadjuvant chemotherapy was completed, patients received amputation or limb-salvage surgery, which was decided with the consideration of patients' Ennecking stage, sensitivity to neoadjuvant chemotherapy, tu...