Alo suppresses human breast cancer cell migration and invasion. (A) MCF-7 and MDA-MB-231 cell non-directional migration was detected by wound healing assay (scale bars, 200 µm; magnification, ×100). (B) MCF-7 and MDA-MB-231 cell directional migration was evaluated by Transwell assay (scale bars, 200 µm; magnification, ×200). (C) MCF-7 and MDA-MB-231 cell invasion was examined by Transwell invasion assay (scale bars, 200 µm; magnification, ×200). (D) Western blotting analyzed the expression of MMP-2 and MMP-9 following Alo (0.1, 0.2 and 0.4 mM) treatment for 24 h. Then the band intensity was quantified by ImageJ software. The results were expressed as the mean ± standard deviation of three independent experiments and each was performed in triplicate. *P<0.05 and **P<0.01 vs. non-Alo treated group (0 mM Alo). Alo, Aloperine; MMP, matrix metalloproteinase.