Long non-coding RNA MRPS30 divergent transcript can be detected in the cytoplasm of triple-negative breast cancer cells and is targeted by microRNA-130b

Long non-coding RNA (lncRNA) MRPS30 divergent transcript (also known as BRCAT54) is recently reported to promote lung cancer. The involvement of BRCAT54 in triple-negative breast cancer (TNBC) is unknown. This study investigated the role of BRCAT54 in TNBC. The expression of BRCAT54 and microRNA(miR)-130b was detected by RT-qPCR. The subcellular location of BRCAT54 in TNBC cells was analyzed by nuclear fractionation assay. Overexpression of BRCAT54 and miR-130b was achieved in TNBC cells to explore the interaction between then. The role of BRCAT54 and miR-130b in TNBC cell proliferation was evaluated by BrdU assay. BRCAT54 was downregulated in TNBC, while miR-130b was upregulated in TNBC tissues. BRCAT54 and miR-130b were inversely correlated across both TNBC and normal tissues. BRCAT54 was detected in cytoplasm and was predicted to be targeted by miR-130b. In TNBC cells, downregulation of BRCAT54 was observed after the overexpression of miR-130b. Moreover, BRCAT54 decreased cell proliferation and miR-130b increased cell proliferation. Besides, BRCAT54 suppressed the role of miR-130b in increasing cell proliferation. Therefore, BRCAT54 can be detected in cytoplasm and was targeted by miR-130b to increase cell proliferation.