PMID- 32791924 OWN - NLM STAT- MEDLINE DCOM- 20211018 LR - 20211018 IS - 1532-4206 (Electronic) IS - 0743-5800 (Linking) VI - 46 IP - 1 DP - 2021 Feb TI - Silencing of Long Non-coding RNA ENST00000606790.1 Inhibits the Malignant Behaviors of Papillary Thyroid Carcinoma through the PI3K/AKT Pathway. PG - 1-9 LID - 10.1080/07435800.2020.1804928 [doi] AB - PURPOSE: This study aimed to investigate the role and mechanism of lncRNA ENST00000606790.1 (ENST) in promoting the progression of papillary thyroid carcinoma (PTC). METHODS: The expression of ENST in human PTC and normal para-cancerous thyroid (NPTC) tissues or cell lines was determined by RT-qPCR. Cell growth was determined by CCK8 assay. Cell colony formation was determined by cell colony formation assay. Cell cycle analysis was performed by staining cells with PI (Propidium Iodide). Cell invasion was assessed by transwell assay. Protein expression was examined by western-blot. siRNA was constructed to inhibit the expression of ENST. 740-Y-P was used to activate PI3K. The correlation between ENST expression and clinical outcomes was analyzed. RESULTS: ENST was significantly up-regulated in PTC tissues or PTC cell lines (PTC and IHH4 cell lines), compared to NPTC tissues or normal cell lines, respectively. High expression of ENST was strongly correlated to lymph node metastasis and tumor size at diagnosis. Silencing of ENST significantly inhibited cell growth and colony formation, arrested the cell cycle at G2/M phase, upregulated the expression of CHK1, downregulated the expression of CDC25C, and inhibited cell invasion. Silencing of ENST significantly down-regulated the expression of PI3K, p-PI3K, AKT, and p-AKT in IHH4 cells. Furthermore, treatment with the PI3K activator 740-Y-P partially abolished the effect of silencing of ENST on PTC cells. CONCLUSIONS: Overall, our results demonstrated that ENST can promote PTC progression by activating the PI3K/AKT signaling pathway, suggesting that ENST can serve as a potential biomarker and new therapeutic target for patients with PTC. FAU - Zuo, Zhihua AU - Zuo Z AD - Department of Endocrinology, The Second Affiliated Hospital of Nanjing Medical University , Nanjing, China. AD - Department of Endocrinology, The Affiliated Jiangning Hospital of Nanjing Medical University , Nanjing, China. FAU - Liu, Ling AU - Liu L AD - Department of Endocrinology, The Second Affiliated Hospital of Nanjing Medical University , Nanjing, China. FAU - Song, Bin AU - Song B AD - Department of Endocrinology, The Second Affiliated Hospital of Nanjing Medical University , Nanjing, China. FAU - Tan, Juan AU - Tan J AD - Department of Gerontology, Huai'an First People's Hospital, Nanjing Medical University , Huai'an, China. FAU - Ding, Dafa AU - Ding D AD - Department of Endocrinology, The Second Affiliated Hospital of Nanjing Medical University , Nanjing, China. FAU - Lu, Yibing AU - Lu Y AD - Department of Endocrinology, The Second Affiliated Hospital of Nanjing Medical University , Nanjing, China. LA - eng PT - Journal Article DEP - 20200813 PL - England TA - Endocr Res JT - Endocrine research JID - 8408548 RN - 0 (Biomarkers) RN - 0 (RNA, Long Noncoding) RN - 0 (RNA, Small Interfering) RN - EC 2.7.11.1 (Oncogene Protein v-akt) SB - IM MH - Biomarkers/metabolism MH - Cell Line, Tumor MH - Gene Expression Regulation, Neoplastic/*genetics MH - Humans MH - Microarray Analysis MH - Oncogene Protein v-akt/*metabolism MH - Phosphatidylinositol 3-Kinases/*metabolism MH - *RNA Interference MH - RNA, Long Noncoding/*metabolism MH - RNA, Small Interfering/*metabolism MH - Signal Transduction/*genetics MH - Thyroid Cancer, Papillary/*metabolism MH - Thyroid Neoplasms/*metabolism OTO - NOTNLM OT - Long non-coding RNA OT - Pi3k/AKT pathway OT - microarray analysis OT - siRNA OT - thyroid carcinoma EDAT- 2020/08/15 06:00 MHDA- 2021/10/21 06:00 CRDT- 2020/08/15 06:00 PHST- 2020/08/15 06:00 [pubmed] PHST- 2021/10/21 06:00 [medline] PHST- 2020/08/15 06:00 [entrez] AID - 10.1080/07435800.2020.1804928 [doi] PST - ppublish SO - Endocr Res. 2021 Feb;46(1):1-9. doi: 10.1080/07435800.2020.1804928. Epub 2020 Aug 13.