PMID- 26106283 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20150624 LR - 20200930 IS - 1475-2867 (Print) IS - 1475-2867 (Electronic) IS - 1475-2867 (Linking) VI - 15 DP - 2015 TI - MicroRNA-24 inhibits growth, induces apoptosis, and reverses radioresistance in laryngeal squamous cell carcinoma by targeting X-linked inhibitor of apoptosis protein. PG - 61 LID - 10.1186/s12935-015-0217-x [doi] LID - 61 AB - BACKGROUND: Increasing evidence indicates that dysregulation of microRNAs is involved in tumor progression and development. The aim of this study was to investigate the expression of microRNA-24 (miR-24) and its function in laryngeal squamous cell carcinoma (LSCC). METHODS: Quantitative RT-PCR (qRT-PCR) was used to detect miR-24 expression in LSCC cell lines and tissue samples. MTT, colony formation, and flow cytometry was performed to analyze the effects of miR-24 expression on growth, apoptosis, and radiosensitivity of LSCC cells. Dual-luciferase reporter assays were performed to examine regulation of putative miR-24 targets. Expression of X-linked inhibitor of apoptosis protein (XIAP) mRNA and protein, cleaved or total caspase-3, and cleaved or total PARP protein were detected by qRT-PCR and western blotting assays, respectively. RESULTS: miR-24 expression levels in LSCC cell lines or tissue were significantly lower than in a normal human keratinocyte cell line or adjacent normal tissues. Functional analyses indicated that re-expression of miR-24 inhibits growth, reduces colony formation, and enhances apoptosis in LSCC cells. In addition, miR-24 upregulation increases LSCC sensitivity to irradiation by enhancing irradiation-induced apoptosis, and luciferase activity indicated that miR-24 binds to the 3'-untranslated region (3'-UTR) of XIAP mRNA. Upregulation of miR-24 inhibits XIAP protein expression in LSCC cells, and silencing of XIAP mimics the effects of miR-24 upregulation on LSCC cells. In addition, XIAP mRNA expression significantly increases in LSCC tissues and is inversely correlated with miR-24 expression. CONCLUSIONS: Our data suggest that miR-24 inhibits growth, increases apoptosis, and enhances radiosensitivity in LSCC cells by targeting XIAP. Therefore, miR-24 may be a potential molecular target for the treatment of human LSCC. FAU - Xu, Li AU - Xu L AD - Department of Otolaryngology-Head and Neck Surgery, Tangdu Hospital and Laboratory for Laryngotracheal Reconstruction, Fourth Military Medical University, Xi'an, Shaanxi 710038 PR China. AD - Department of Otolaryngology-Head and Neck Surgery, Nanjing General Hospital of Nanjing Military Command, Nanjing, Jiangsu 210002 PR China. FAU - Chen, Zhifeng AU - Chen Z AD - Department of Otolaryngology-Head and Neck Surgery, Lanzhou General Hospital of Lanzhou Military Command, Lanzhou, Gansu 730050 PR China. FAU - Xue, Fei AU - Xue F AD - Department of Otolaryngology-Head and Neck Surgery, Nanjing General Hospital of Nanjing Military Command, Nanjing, Jiangsu 210002 PR China. FAU - Chen, Wei AU - Chen W AD - Department of Otolaryngology-Head and Neck Surgery, Nanjing General Hospital of Nanjing Military Command, Nanjing, Jiangsu 210002 PR China. FAU - Ma, Ruina AU - Ma R AD - Department of Otolaryngology-Head and Neck Surgery, Tangdu Hospital and Laboratory for Laryngotracheal Reconstruction, Fourth Military Medical University, Xi'an, Shaanxi 710038 PR China. FAU - Cheng, Shiyin AU - Cheng S AD - Department of Otolaryngology-Head and Neck Surgery, Tangdu Hospital and Laboratory for Laryngotracheal Reconstruction, Fourth Military Medical University, Xi'an, Shaanxi 710038 PR China. FAU - Cui, Pengcheng AU - Cui P AD - Department of Otolaryngology-Head and Neck Surgery, Tangdu Hospital and Laboratory for Laryngotracheal Reconstruction, Fourth Military Medical University, Xi'an, Shaanxi 710038 PR China. LA - eng PT - Journal Article DEP - 20150617 PL - England TA - Cancer Cell Int JT - Cancer cell international JID - 101139795 PMC - PMC4477309 OTO - NOTNLM OT - Apoptosis OT - Growth OT - Laryngeal squamous cell carcinoma OT - XIAP OT - miR-24 EDAT- 2015/06/25 06:00 MHDA- 2015/06/25 06:01 PMCR- 2015/06/17 CRDT- 2015/06/25 06:00 PHST- 2014/12/12 00:00 [received] PHST- 2015/06/11 00:00 [accepted] PHST- 2015/06/25 06:00 [entrez] PHST- 2015/06/25 06:00 [pubmed] PHST- 2015/06/25 06:01 [medline] PHST- 2015/06/17 00:00 [pmc-release] AID - 217 [pii] AID - 10.1186/s12935-015-0217-x [doi] PST - epublish SO - Cancer Cell Int. 2015 Jun 17;15:61. doi: 10.1186/s12935-015-0217-x. eCollection 2015.