Long Noncoding RNA Small Nucleolar RNA Host Gene 3 Mediates Prostate Cancer Migration, Invasion, and Epithelial-Mesenchymal Transition by Sponging miR-487a-3p to Regulate TRIM25.

Abstract

Background: Long noncoding RNA small nucleolar RNA host gene 3 (SNHG3) is related to the proliferation and metastasis of cancer cells. This study aims to reveal the role of SNHG3 in prostate cancer (PCa), which may help prevent PCa metastasis. Methods: SNHG3 plasmid, SNHG3 siRNA, miR-487a-3p mimic, miR-487a-3p inhibitor, TRIM25 plasmid, and TRIM25 siRNA were transfected or cotransfected into LNCaP and PC-3 cells. The proliferation, migration, and invasion of PCa cells were measured by Cell Counting Kit-8, wound-healing, and transwell assays, respectively. The expressions of SNHG3, miR-487a-3p, E-cadherin, N-cadherin, Snail, and TRIM25 in PCa tissues and cells were measured by quantitative reverse transcription polymerase chain reaction or Western blot. Results: SNHG3 expression level was upregulated in PCa tissues and cells. SNHG3 overexpression and miR-487a-3p inhibitor promoted cell viability, migration, invasion, and N-cadherin and Snail levels, and inhibited E-cadherin level in LNCaP cells, while SNHG3 silencing and miR-487a-3p mimic had the opposite effects on PC-3 cells. The inhibitory effect of miR-487a-3p mimic on the migration, invasion, and epithelial-mesenchymal transition (EMT) of LNCaP cells was inversed by both SNHG3 and TRIM25 plasmids. Similarly, the function of miR-487a-3p inhibitor in PC-3 cells was also inversed by SNHG3 siRNA and TRIM25 siRNA. Conclusion: SNHG3 mediates PCa migration, invasion, and EMT by sponging miR-487a-3p to regulate TRIM25. The Clinical Trial Registration number: Y20180831.