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Open AccessArticle

Effects of Bisphenol A on Oxidative Stress in the Rat Brain

1
Food Hygiene and Environmental Health Division of Applied Life Science, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan
2
Department of Medical System Protective Health and Medicine Laboratory, Graduate School of Life and Medical Sciences Doshisha University, Kyotanabe 610-0394, Japan
3
Department of Hepato-Biliary-Pancreatic Surgery, Graduate School of Medicine, Osaka City University, Abeno-ku, Osaka 545-8585, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Antioxidants 2020, 9(3), 240; https://doi.org/10.3390/antiox9030240
Received: 6 January 2020 / Revised: 18 February 2020 / Accepted: 14 March 2020 / Published: 16 March 2020
(This article belongs to the Special Issue Oxidative Stress in Food Additives and Other Exposomes)
We investigated the effect of bisphenol A (BPA) on oxidative stress and tau-related proteins in adult rat brains. BPA (10 mg/L) was administered to rats for eight weeks through their drinking water. The reactive oxygen species (ROS) scavenging capacity for hydroxyl radicals in the plasma was reduced after two weeks. In the hippocampus, four and eight weeks of BPA increased the ratio of oxidized DJ-1/DJ-1 (PARK7). The ratio of phosphorylated-GSK3β/GSK3β and phosphorylated-AKT/AKT increased after one week of BPA treatment. The ratio of phosphorylated JNK/JNK and phosphorylated-ERK/ERK increased after eight weeks of BPA; the elevation could be related to tau phosphorylation. Protein phosphatase 2A (PP2A) in the hippocampus decreased after eight weeks of BPA treatment. At that time, SOD1 was significantly induced, but no changes in SOD2 expression were apparent in the hippocampus. Furthermore, the ratio of phosphorylated-tau (PHF-1, Ser396/ Ser404) to total tau level did not change. However, PHF-1 or other sites of tau could be phosphorylated after eight weeks in the hippocampi of rats. BPA induced systemic oxidative stress and could change ROS-induced signaling pathways in the brain. These results suggest that mitochondrial dysfunction possibly is not responsible for oxidative stress and neurodegeneration due to low doses of BPA. View Full-Text
Keywords: bisphenol A; dementia; oxidative stress; tau bisphenol A; dementia; oxidative stress; tau
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Kobayashi, K.; Liu, Y.; Ichikawa, H.; Takemura, S.; Minamiyama, Y. Effects of Bisphenol A on Oxidative Stress in the Rat Brain. Antioxidants 2020, 9, 240.

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