MiR-140 targets lncRNA FAM230B to suppress cell proliferation in acute myeloid leukemia running title: MiR-140 targets FAM230B in AML.

FAM230B serves as an oncogenic lncRNA in both gastric cancer and papillary thyroid cancer, while its role in acute myeloid leukemia (AML) is unclear. We predicted that FAM230B could be a target of miR-140, a well-characterized tumor suppressor, and analyzed their interaction in AML. Differential expressions of FAM230B and miR-140 in bone marrow mononuclear cells (BMMNCs) were determined by RT-qPCR. Correlations were analyzed by Pearson's correlation coefficient. Subcellular FAM230B location was determined using cellular fractionation assay. The direct interaction between FAM230B and miR-140 was confirmed by RNA pull-down assay. The roles of FAM230B and miR-140 in cell proliferation were explored using BrdU assay. High FAM230B expression level and low miR-140 expression level were observed in AML. FAM230B and miR-140 were inversely correlated and directly interacted with each other. FAM230B could be detected in both cytoplasm and nuclear samples. MiR-140 overexpression downregulated FAM230B expression and suppressed the enhancing effects of FAM230B overexpression on cell proliferation. MiR-140 may target FAM230B to suppress cell proliferation in AML. [ABSTRACT FROM AUTHOR]