Glucocorticoid Generates ROS to Induce Oxidative Injury in the Hippocampus, Leading to Impairment of Cognitive Function of Rats
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- Sato Hiroya
- Division of Biological Chemistry, Shibaura Institute of Technology
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- Takahashi Takeyuki
- Division of Biological Chemistry, Shibaura Institute of Technology
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- Sumitani Kazumi
- Division of Biochemistry, Shibaura Institute of Technology
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- Takatsu Hirokatsu
- Division of Biological Chemistry, Shibaura Institute of Technology
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- Urano Shiro
- Division of Biochemistry, Shibaura Institute of Technology
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The present study attempted to clarify whether over-secretion of glucocorticoids in the serum caused by increased hypothalamus-pituitary-adrenal activity induces oxidative stress in the rat brain, and how the stress causes the emergence of cognitive deficits. When rats were subcutaneously injected with corticosterone, lipid hydroperoxides and protein carbonyls increased markedly in the hippocampus in association with a decrease in activity of antioxidative enzymes, such as superoxide dismutase, catalase and glutathione peroxidase. These results suggest that high-level corticosterone in the serum induces reactive oxygen species (ROS), leading to oxidative damage in the hippocampus. After administration of corticosterone to rats, glucose and superoxide levels in the serum increased markedly. Furthermore, pyramidal cell apoptosis was observed to accompany the loss of glucocorticoid receptors at the cornus ammonis 1 region of the hippocampus. Rats injected with corticosterone showed marked deficits in memory function. The present results imply that ROS generated from the glycation reaction of increased glucose levels caused by gluconeogenesis activation through glucocorticoid with proteins in the serum attack the hippocampus to induce neurodegeneration, resulting in cognitive deficits in rats.<br>
収録刊行物
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- Journal of Clinical Biochemistry and Nutrition
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Journal of Clinical Biochemistry and Nutrition 47 (3), 224-232, 2010
一般社団法人 日本酸化ストレス学会
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詳細情報 詳細情報について
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- CRID
- 1390001204671529984
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- NII論文ID
- 130004879213
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- ISSN
- 18805086
- 09120009
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可