Bladder cancer‐associated transcript 1 promotes melanoma cell proliferation and invasion via the miR‐374b‐5p/U2‐associated factor homology motif kinase 1 axis

Melanoma is a malignancy derived from melanocytes and is associated with high mortality rates worldwide. Long noncoding RNAs (lncRNAs) have been confirmed to be pivotal regulators in multiple types of cancer. Many lncRNAs are aberrantly expressed in tumors and perform vital functions in cancer progression. Nevertheless, the biological role of lncRNA bladder cancer‐associated transcript 1 (BLACAT1) in melanoma progression remains unexplored. In this study, the collected data showed that BLACAT1 was highly expressed in melanoma. Mechanistically, miR‐374b‐5p bound to BLACAT1, and U2‐associated factor homology motif kinase 1 (UHMK1) was a downstream target of miR‐374b‐5p. BLACAT1 upregulated UHMK1 expression by acting as a competing endogenous RNA for miR‐374‐5b. BLACAT1 deficiency resulted in the upregulation of miR‐374b‐5p expression and the downregulation of UHMK1 expression in melanoma cells. Moreover, BLACAT1 activated PI3K and AKT signaling by upregulating UHMK1 expression, as shown by western blotting analyses. Functionally, UHMK1 overexpression or miR‐374b‐5p knockdown reversed the suppressive effect of BLACAT1 depletion on melanoma cell proliferation and invasion. In conclusion, BLACAT1 promotes melanoma cell proliferation and invasion by upregulating UHMK1 expression via miR‐374b‐5p to activate the PI3K/AKT pathway. These results might provide promising insight into the investigation of prognostic biomarkers of melanoma.