Overexpression of miR-328-3p Inhibits Epithelial-Mesenchymal Transition in Prostate Cancer by Downregulating PFN1

MicroRNA (miR)-328-3p is believed to have anti-tumor impacts in various human cancers. However, its role in prostate cancer (PCa) is uncertain. In this research, miR-328-3p expression in PCa was reduced. Meanwhile, it was discovered that miR-328-3p directly targeted profilin-1 (PFN1) 3'-untranslated region to negatively modulate PFN1. Elevating miR-328-3p or reducing PFN1 suppressed cell growth, migration, and invasion, and epithelial-mesenchymal transition; overexpression of miR-328-3p or inhibition of PFN1 delayed tumor growth in vivo. Further studies found that PCa patients with advanced T stage or high Gleason score had significantly lower miR-328-3p compared to PCa patients with early stage or low score. In addition, PCa patients with high miR-328-3p had a better prognosis than those with low miR-328-3p. Briefly, this study highlights the clinical and biological role of miR-328-3p as a tumor suppressor miRNA in PCa and explores the downstream mechanisms of miR-328-3p.