Long non-coding RNA X-inactive specific transcript promotes osteosarcoma metastasis via modulating microRNA-758/Rab16

Authors：Liu, Wei; Long, Qiuping; Zhang, Li; Zeng, Dehui; Hu, Bingbing; Zhang, Wei; Liu, Shengyao; Deng, Songyun; Chen, Li^*

Source：Annals of Translational Medicine, 2021, 9(10): 841.

DOI：10.21037/atm-21-1032

• Osteosarcoma (OS)
• lncRNA X-inactive specific transcript (lncRNA XIST)
• microRNA-758
• tumor metastasis
• Rab16

Background: As a common malignant bone sarcoma, osteosarcoma (OS) affects the health and lives of many people. Here, we probed the effects of long non-coding RNA (lncRNA) X-inactive specific transcript (XIST) and microRNA-758 (miR-758) on OS metastasis, and examined possible downstream effector. Methods: Quantitative reverse transcription PCR (qRT-PCR) was performed to detect the expressions of XIST and miR-758 in OS tissues and cells. Cell transfection was carried out to alter the levels of XIST and miR-758 in OS cells, and cell viability, migration, and invasion were assessed. Subsequently, qRT-PCR and a dual-luciferase reporter assay were conducted to analyze the regulatory effects of XIST on miR-758 and miR-758 on Rab16. Finally, we investigated whether Rab16 was the downstream effector of XIST/miR-758 axis. Results: XIST was highly expressed in OS tissues and cells, but the opposite was seen for miR-758. In OS cells, migration, invasion, and epithelial-mesenchymal transformation (EMT) was promoted by overexpression of XIST and miR-758 inhibitor, but were inhibited by XIST knockdown and miR758 mimics. XIST regulated miR-758 expression, and miR-758 regulated Rab16 expression in OS cells. Overexpression of Rab16 reversed the effects of miR-758 mimics on OS cell migration and invasion. @@@ Conclusions: XIST contributed to OS cell migration, invasion, and EMT via regulation of miR-758/ Rab16.

• Institution
  Guangzhou Medical University; Southern Medical University