Impaired miRNA processing–induced uPA expression is functionally linked to inefficient miR-193a/b and miR-181a miRNA processing. (A) Cells were transduced with control lentiviral vector or vector containing Drosha, DGCR8, or Dicer shRNA for 4 days. Cells were lysed, and cell lysates were subjected to immunoblotting to detect uPA with uPA mAb. The membranes were stripped and reprobed for β-actin to ensure equal protein loading. (B) Drosha and DGCR8 knockdown MDA-MB-231 cells were transfected with negative control, miR-23a, miR-193a, miR-193b, or miR-181a mimics for 3 days. Cells were lysed, and cell lysates were subjected to immunoblotting to detect uPA with uPA mAb. The membranes were stripped and reprobed for β-actin to ensure equal protein loading.