Effects of ERCC5 rs751402 Polymorphism on Oxidative Stress and the Impact of Curcumin on Catalase Activity in Breast Carcinogenesis

BACKGROUND: Breast cancer is a complex multifactorial disease and polymorphisms in nucleotide excision repair pathway are associated with the potential risk of breast cancer. Pathological processes linked to breast cancer are associated with oxidative stress. Catalase plays an essential role in cell defense against oxidative stress. Curcumin has antioxidant activity that can significantly reduce oxidative stress levels. The aims of this study were to determine ERCC5 rs751402 polymorphism was associated with oxidative stress in breast carcinogenesis. The impact of curcumin on catalase activity for inhibiting breast cancer progression was also studied. METHODS: The effect of ERCC5 rs751402 polymorphism on oxidative stress was studied with different H(2)O(2) concentrations in HCC 1937 cell line for 24 h and then analysed by MTT assay. The impact of curcumin on catalase activity was studied in MCF-7 cell line treated with different curcumin concentrations for 24 h and then analysed by trypan blue exclusion assay and catalase activity assay. RESULTS: It showed that this polymorphism involved in oxidative stress (p < 0.05) and curcumin caused the antiproliferative effect by the catalase activity increase (p < 0.05). CONCLUSION: Our study indicated that ERCC5 rs751402 polymorphism may contribute to the etiology of breast carcinogenesis about the failure of oxidative stress protection and lead to breast carcinogenesis. The antiproliferative effect of curcumin may be associated with catalase activity and protect breast carcinogenesis.