Abstract
Objective To evaluate the effect of isoflurane on the expression of hippocampal ubiquitin C-terminal hydrolase-L1(UCH-L1)mRNA in aged rats. Methods Thirty-six pathogen-free healthy male Sprague-Dawley rats, aged 20 months, weighing 500-700 g, were divided into 2 groups using a random number table: control group(group C, n=12)and isoflurane group(group I, n=24). In group I, 2% isoflurane was continuously inhaled for 2 h. Twelve rats were selected at 24 and 72 h after stopping isoflurane inhalation(T1, 2), and Y-maze test was performed to evaluate cognitive function.The animals were sacrificed after the end of Y-maze test and their hippocampi were removed for determination of UCH-L1 expression(by immuno-histochemistry)and UCH-L1 mRNA expression(by real-time polymerase chain reaction). Results Compared with group C, the total number of training achieving the standard was significantly increased at T1(P 0.05). Conclusion The mechanism by which isoflurane induces cognitive decline may be related to down-regulating the expression of UCH-L1 mRNA in hippocampal tissues of aged rats. Key words: Isoflurane; Ubiquitin C; Aged; Hippocampus
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