Involvement of 15-lipoxygenase-1 in the regulation of breast cancer cell death induced by sodium butyrate.

15-Lipoxygenase-1 (15-Lox-1) as a member of fatty acid dioxygenases family has received considerable attention as an effector of cancer cell growth. The relevance of sodium butyrate on 15-Lox-1 pathway has not been determined in breast cancer. This study is aimed to investigate the possible involvement of 15-Lox-1 in the regulation of breast cancer cell growth by sodium butyrate. MTT assay was used to assess the cytotoxicity effect and Annexin-V-FITC staining was applied for detection of apoptosis using flow cytometry. The involvement of 15-Lox-1 was examined using 15-Lox-1 specific inhibitor and enzyme gene expression level and activity was further analyzed by Real-time PCR and measurement of 13(S)-HODE. The results revealed that sodium butyrate increased the expression of 15-Lox-1 and production of 13(S)HODE. 15-Lox-1 was also involved in the sodium butyrate-induced breast cancer cell cytotoxicity and apoptosis. This study provided more evidences on the positive effectiveness of 15-Lox-1/13(S)-HODE on controlling growth of breast cancer cells.