1. Hyperbaric oxygen preconditioning ameliorates anxiety-like behavior and cognitive impairments via upregulation of thioredoxin reductases in stressed rats
- Author
-
Peng, Ye, Feng, Shu-Fang, Wang, Qiang, Wang, Hua-Ning, Hou, Wu-Gang, Xiong, Lize, Luo, Zhuo-Jing, and Tan, Qing-Rong
- Subjects
- *
HYPERBARIC oxygenation , *ANXIETY , *POST-traumatic stress disorder , *APOPTOSIS , *REACTIVE oxygen species , *GENE expression , *LABORATORY rats , *COGNITION disorders - Abstract
Abstract: The present study examined the protective effect of hyperbaric oxygen preconditioning (HBO-PC) and the role of thioredoxin reductase (TrxR) in a post-traumatic stress disorder (PTSD)-induced rat model by using single prolonged stress (SPS). Rats were randomly divided into Sham, HBO, SPS and HBO+SPS groups. HBO-PC was conducted by exposing rats to 100% oxygen at 2.5atm absolute for 1h each day for 5 consecutive days. SPS was performed 24h after the last HBO-PC conditioning event. At 1h, 6h, 12h, 24h and 72h after SPS, TrxR mRNA expression was analyzed in the hippocampus; Nissl and TUNEL staining were performed at 72h after SPS. The results indicated that HBO-PC was able to significantly preserve viable neurons in the CA1 subfield of hippocampus following SPS exposure, as evidenced by reduced amounts of CA1 neuronal apoptosis. Furthermore, HBO-PC upregulate the expression of TrxR-1 and TrxR-2 mRNA in the hippocampus at 6h and 12h after SPS exposure and ameliorated anxiety-like behavior and cognitive impairments normally induced by SPS. Taken together, these findings suggest that HBO-PC is beneficial for the improvement of anxiety-like behavior and cognitive impairments induced by SPS exposure, and this effect might be associated with inhibition of neuronal apoptosis via upregulation of TrxR in stressed rats. [Copyright &y& Elsevier]
- Published
- 2010
- Full Text
- View/download PDF