PMID- 28849168 OWN - NLM STAT- MEDLINE DCOM- 20180608 LR - 20181113 IS - 1791-3004 (Electronic) IS - 1791-2997 (Print) IS - 1791-2997 (Linking) VI - 16 IP - 4 DP - 2017 Oct TI - MicroRNA‑503 serves an oncogenic role in laryngeal squamous cell carcinoma via targeting programmed cell death protein 4. PG - 5249-5256 LID - 10.3892/mmr.2017.7278 [doi] AB - Laryngeal squamous cell carcinoma (LSCC), the most common form of laryngeal carcinoma, is an aggressive malignancy that demonstrates the second highest rate of morbidity of all head and neck squamous cell carcinomas. The abnormal expression of microRNAs (miRs) has been demonstrated in a number of types of human cancer, and they have been demonstrated to be oncogenes or tumour suppressor genes. miR‑503 has been studied in various types of human cancer; however, the expression level, roles and underlying mechanisms in LSCC remain unknown. In the present study, it was demonstrated that miR‑503 was significantly upregulated in LSCC tissues and cell lines. The level of miR‑503 in LSCC tissues was correlated with thyroid cartilage invasion, lymph node metastasis, and tumour, node and metastasis stage. In addition, down‑regulation of miR‑503 inhibited cell proliferation and invasion in LSCC. Programmed cell death protein 4 (PDCD4) was identified to be a direct target gene of miR‑503. PDCD4 overexpression could mimic the roles of miR‑503 underexpression in LSCC. Furthermore, PDCD4 was down‑regulated in LSCC tissues and this correlated with the miR‑503 expression level. In conclusion, these results suggested that miR‑503 promotes tumour growth and invasion by directly targeting PDCD4. The identification of the miR‑503/PDCD4 axis may provide novel targets for LSCC treatment and improve prognosis. FAU - Shuang, Yu AU - Shuang Y AD - Department of Otorhinolaryngology and Maxillofacial Oncology, Tianjin Medical University Cancer Institute and Hospital, Key Laboratory of Cancer Prevention and Therapy, Tianjin Cancer Institute, National Clinical Research Center of Cancer, Tianjin 300060, P.R. China. FAU - Zhou, Xuan AU - Zhou X AD - Department of Otorhinolaryngology and Maxillofacial Oncology, Tianjin Medical University Cancer Institute and Hospital, Key Laboratory of Cancer Prevention and Therapy, Tianjin Cancer Institute, National Clinical Research Center of Cancer, Tianjin 300060, P.R. China. FAU - Li, Chao AU - Li C AD - Department of Otorhinolaryngology, Head and Neck Surgery, The Second Hospital of Tianjin Medical University, Tianjin 300211, P.R. China. FAU - Huang, Yongwang AU - Huang Y AD - Department of Otorhinolaryngology, Head and Neck Surgery, The Second Hospital of Tianjin Medical University, Tianjin 300211, P.R. China. FAU - Zhang, Lun AU - Zhang L AD - Department of Otorhinolaryngology and Maxillofacial Oncology, Tianjin Medical University Cancer Institute and Hospital, Key Laboratory of Cancer Prevention and Therapy, Tianjin Cancer Institute, National Clinical Research Center of Cancer, Tianjin 300060, P.R. China. LA - eng PT - Journal Article DEP - 20170817 PL - Greece TA - Mol Med Rep JT - Molecular medicine reports JID - 101475259 RN - 0 (3' Untranslated Regions) RN - 0 (Apoptosis Regulatory Proteins) RN - 0 (MIRN503 microRNA, human) RN - 0 (MicroRNAs) RN - 0 (PDCD4 protein, human) RN - 0 (RNA-Binding Proteins) SB - IM MH - 3' Untranslated Regions/genetics MH - Apoptosis Regulatory Proteins/*genetics/metabolism MH - Base Sequence MH - Carcinoma, Squamous Cell/*genetics/*pathology MH - Cell Line, Tumor MH - Cell Proliferation/genetics MH - Down-Regulation/genetics MH - Female MH - Gene Expression Regulation, Neoplastic MH - HEK293 Cells MH - Humans MH - Laryngeal Neoplasms/*genetics/*pathology MH - Male MH - MicroRNAs/genetics/*metabolism MH - Middle Aged MH - Neoplasm Invasiveness MH - RNA-Binding Proteins/*genetics/metabolism MH - Up-Regulation/genetics PMC - PMC5647079 EDAT- 2017/08/30 06:00 MHDA- 2018/06/09 06:00 PMCR- 2017/08/17 CRDT- 2017/08/30 06:00 PHST- 2016/09/21 00:00 [received] PHST- 2017/06/22 00:00 [accepted] PHST- 2017/08/30 06:00 [pubmed] PHST- 2018/06/09 06:00 [medline] PHST- 2017/08/30 06:00 [entrez] PHST- 2017/08/17 00:00 [pmc-release] AID - mmr-16-04-5249 [pii] AID - 10.3892/mmr.2017.7278 [doi] PST - ppublish SO - Mol Med Rep. 2017 Oct;16(4):5249-5256. doi: 10.3892/mmr.2017.7278. Epub 2017 Aug 17.