Recent studies have demonstrated that lipoxygenase (LOX) inhibitor induces growth arrest of cancer cells through apoptosis. In this study, we examined the effects of LOX inhibitors on cell proliferation in renal cell carcinoma (RCC), bladder tumor (BT), and prostate cancer (PC) cell lines. We investigated the inhibitory effect of LOX inhibitors, 5-, 12- and non-specific LOX inhibitor on RCC, BT and PC-derived cell lines using MTT assay and Hoechst staining. All LOX inhibitors induced the reduction of cell viability with the half-maximal concentration of growth inhibition of RCC, BT, and PC cell lines. Furthermore, counting cells at days 1, 2 and 3, clearly showed marked inhibition of cell proliferation by treatment with non-specific and 5-LOX inhibitor. All LOX inhibitors stopped the growth of all RCC, BT and PC cells. The effect of non-specific LOX inhibitor was strongest. The effect of 5-LOX inhibitor was stronger than 12-LOX inhibitor. All LOX inhibitors caused marked inhibition of urological cancer cells through apoptosis. LOX inhibitor may mediate potent antiproliferative effects against RCC, BT and PC cells through differentiation. Thus, LOX inhibitor, especially 5-LOX inhibitor may become a new target in treatment of urological cancers.

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