miRNA-149* was upregulated in T-ALL cells and T-ALL patients’ bone marrow samples.
JunB was a target of miR-149*, and miRNA-149* mimics downregulated JunB levels.
miRNA-149* mimics promoted proliferation and reduced cell apoptosis in T-ALL cells.
miRNA-149* mimics downregulated p21 and upregulated cyclinD1, 4EBP1, and p70s6k.
miRNA-149* inhibitors exhibited opposite effects.