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Chiang, Yun‐Wei; Su, Chun‐Hung; Sun, Han‐Yin; Chen, Shih‐Pin; Chen, Chun‐Jung; Chen, Wen‐Ying; Chang, Chia‐Che; Chen, Chuan‐Mu; Kuan, Yu‐Hsiang
Environmental toxicology, January 2022, 2022-Jan, 2022-01-00, 20220101, Letnik: 37, Številka: 1Journal Article
Bisphenol A (BPA) is an estrogen‐like compound, and an environmental hormone, that is commonly used in daily life. Therefore, it may enter the human body through food or direct contact, causing BPA residues in blood and urine. Because most studies focused on the analysis of BPA in reproductive cells or tissues, regarding evidence the effect of BPA on human retinal pigment epithelium (ARPE‐19) cells unavailable. Accordingly, the present study explored the cytotoxicity of BPA on ARPE‐19 cells. After BPA treatment, the expression of Bcl‐XL an antiapoptotic protein, in the mitochondria decreased, and the expression of Bax, a proapoptotic protein increased. Then the mitochondrial membrane potential was affected. BPA changed in mitochondrial membrane potential led to the release of cytochrome C, which activated caspase‐9 to promote downstream caspase‐3 leading to cytotoxicity. The nuclear factor (erythroid‐derived 2)‐like 2 (Nrf2) and heme oxygenase 1 (HO‐1) pathway play a major role in age‐related macular degeneration. Our results showed that expression of HO‐1 and Nrf2 suppressed by BPA. Superoxide dismutase and catalase, which Nrf2 downstream antioxidants, were degraded by BPA. AMP‐activated kinase (AMPK), which can regulate the phosphorylation of Nrf2, and the phosphorylation of AMPK expression was reduced by BPA. Finally, BPA‐induced ROS generation and cytotoxicity were reduced by N‐acetyl‐l‐cysteine. Taken together, these results suggest that BPA induced ARPE‐19 cells via oxidative stress, which was associated with down regulated Nrf2/HO‐1 pathway, and the mitochondria dependent apoptotic signaling pathway.
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