Inhibitory effect of recombinant tyrosine‑sulfated madanin‑1, a thrombin inhibitor, on the behavior of MDA‑MB‑231 and SKOV3 cells in vitro .

Thrombin, which plays a crucial role in hemostasis, is also implicated in cancer progression. In the present study, the effects of the thrombin‑targeting recombinant tyrosine‑sulfated madanin‑1 on cancer cell behavior and signaling pathways compared with madanin‑1 wild‑type (WT) were investigated. Recombinant madanin‑1 2 sulfation (madanin‑1 2S) and madanin‑1 WT proteins were generated using Escherichia coli . SKOV3 and MDA‑MB‑231 cells were treated with purified recombinant proteins with or without thrombin stimulation. Migration and invasion of cells were analyzed by wound healing assay and Transwell assay, respectively. Thrombin markedly increased cell migration and invasion in both SKOV3 and MDA‑MB‑231 cells, which were significantly suppressed by madanin‑1 2S (P<0.05). Madanin‑1 2S also significantly suppressed thrombin‑induced expression of phosphorylated (p)‑Akt and p‑extracellular signal‑regulated kinase in both cell lines (P<0.05), whereas madanin‑1 WT had no effect on the expression levels of these proteins in MDA‑MB‑231 cells. Furthermore, madanin‑1 2S significantly reversed the effects of thrombin on E‑cadherin, N‑cadherin and vimentin expression in MDA‑MB‑231 cells (P<0.05), whereas madanin‑1 WT did not show any effect. In conclusion, madanin‑1 2S suppressed the migration and invasion of cancer cells more effectively than madanin‑1 WT. It is hypothesized that inhibiting thrombin via the sulfated form of madanin‑1 may be a potential candidate for enhanced cancer therapy; however, further in vivo validation is required.