PMID- 29387244 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20200929 IS - 1792-1074 (Print) IS - 1792-1082 (Electronic) IS - 1792-1074 (Linking) VI - 15 IP - 1 DP - 2018 Jan TI - miR-144 suppresses proliferation and induces apoptosis of osteosarcoma cells via direct regulation of mTOR expression. PG - 1163-1169 LID - 10.3892/ol.2017.7364 [doi] AB - Studied as a type of tumor suppressor, microRNA (miR) performs an important role in growth and apoptosis of various human carcinomas. However, the effects of miR-l44 on osteosarcoma growth and apoptosis, as well as possible underlying mechanisms, remain unclear. The present study investigated the expression of miR-144 in osteosarcoma MG-63 and U-2 OS cell lines compared with osteoblast cells. In order to elucidate the effects of miR-144 on osteosarcoma, miR-144 was upregulated in MG-63 and U-2 OS cells by transfecting chemically synthesized miR-144 mimics. Bioinformatics analysis of potential miR-144 target genes was performed using TargetScanHuman 7.0 and confirmed by luciferase assay. This analysis identified mammalian target of rapamycin (mTOR) as a target of miR-144. The present results indicated that the overexpression of miR-144 may significantly inhibit proliferation and promote apoptosis of MG-63 and U-2 cells compared with scramble control. Furthermore, the effects of miR-144 on osteosarcoma were associated with the mTOR signaling pathway via directly targeting the 3' untranslated region of mTOR mRNA, resulting in a decrease in the level of mTOR protein. In summary, miR-144 was demonstrated to act as a tumor suppressor, which inhibits proliferation and promotes apoptosis of osteosarcoma cell lines. In addition, this effect was mediated by direct targeting on mTOR following inhibition of the mTOR signaling pathway. The present study suggested that miR-144 may be a candidate for the gene therapy of osteosarcoma. FAU - Ren, Yuan-Fei AU - Ren YF AD - Department of Hand and Foot Surgery, Dalian Municipal Central Hospital, Dalian, Liaoning 116033, P.R. China. FAU - Zhang, Tie-Hui AU - Zhang TH AD - Department of Hand and Foot Surgery, Dalian Municipal Central Hospital, Dalian, Liaoning 116033, P.R. China. FAU - Zhong, Sheng AU - Zhong S AD - Department of Hand and Foot Surgery, Dalian Municipal Central Hospital, Dalian, Liaoning 116033, P.R. China. FAU - Zhao, Yan-Tao AU - Zhao YT AD - Department of Hand and Foot Surgery, Dalian Municipal Central Hospital, Dalian, Liaoning 116033, P.R. China. FAU - Lv, Ya-Nan AU - Lv YN AD - Department of Radiology, Dalian Municipal Central Hospital, Dalian, Liaoning 116033, P.R. China. LA - eng PT - Journal Article DEP - 20171108 PL - Greece TA - Oncol Lett JT - Oncology letters JID - 101531236 PMC - PMC5768133 OTO - NOTNLM OT - gene therapy OT - mammalian target of rapamycin signaling pathway OT - microRNA-144 OT - osteosarcoma EDAT- 2018/02/02 06:00 MHDA- 2018/02/02 06:01 PMCR- 2017/11/08 CRDT- 2018/02/02 06:00 PHST- 2015/12/04 00:00 [received] PHST- 2017/05/11 00:00 [accepted] PHST- 2018/02/02 06:00 [entrez] PHST- 2018/02/02 06:00 [pubmed] PHST- 2018/02/02 06:01 [medline] PHST- 2017/11/08 00:00 [pmc-release] AID - OL-0-0-7364 [pii] AID - 10.3892/ol.2017.7364 [doi] PST - ppublish SO - Oncol Lett. 2018 Jan;15(1):1163-1169. doi: 10.3892/ol.2017.7364. Epub 2017 Nov 8.