Abstract
Background: Previous studies have shown that miR-19a-3p is expressed at higher levels in melanoma tissues, suggesting that it may be involved in the progression of melanoma. This study sought to elucidate the biological function of miR-19a-3p in melanoma. Methods: In this study, RT-qPCR was performed to measure the expression level of miR-19a-3p in melanoma tissues and cell lines. The relationship between miR-19a-3p and the prognosis of melanoma patients was assessed by Kaplan-Meier analysis and the Cox regression model. The effects of miR-19a-3p on cell proliferation, migration, and invasion were analyzed by Cell Counting Kit-8 (CCK-8) and Transwell assays. The targeting relationship between miR-19a-3p and adrenergic receptor β1 (ADRB1) was verified by Dual-luciferase reporter assay. Results: miR-19a-3p was significantly overexpressed in melanoma tissues and cell lines. The high expression of miR-19a-3p was significantly associated with a higher TNM stage, lymph node metastasis, and decreased survival rate. Inhibition of miR-19a-3p could significantly weaken the proliferation, migration, and invasion abilities of melanoma cells. ADRB1 was a direct target of miR-19a-3p, and their expressions were negatively correlated. Knockdown of ADRB1 reversed the anti-tumor effect of miR-19a-3p inhibitor. Conclusion: miR-19a-3p promoted the malignant progression of melanoma by targeting and inhibiting ADRB1. Its expression level can serve as an independent biomarker for evaluating the prognosis of melanoma patients.