药物研究
YUAN Li-yong;DAI Ti-jun;WANG Xia-min;CHENG Fang
2008, 27(1): 7-10.
Objective To investigate the effects of midazolam and penehyclidine hydrochloride on memory acquisition, consolidation and retrieval processes of mice in stepthrough test. Methods According to stratified randomized block design,150 Kunming mice were divided into 7 groups: midazolam 1 mg8226;kg-1(group M, n=30), penehyclidine hydrochloride 0.2 mg8226;kg-1 (group P, n=30),midazolam 1 mg8226;kg-1+ penehyclidine hydrochloride 0.2 mg8226;kg-1 (group M+P, n=30) and control group(group NS,n=30); scopolamine 2 mg8226;kg-1 (group S, n=10) Sodium nitrite 125 mg8226;kg-1 (group SN, n=10) and 30%alcohol 0.1 mL8226;(10 g)-1(group A, n=10) as positive control groups. Stepthrough test was used to evaluate the effects of midazolam and penehyclidine hydrochloride on memory acquisition, consolidation and retrieval processes of mice. The latencies and the numbers of errors during testing section were recorded as the marks of learning and memory. The effects of midazolan and penehyclidine hydrochloride on memory acquisition, drugs administrated before training section to test memory acquisition. Midazolam, penehyclidine hydrochloride or normal saline was injected intraperitoneally 30 min before training section respectively. Positive drug scopolamine was injected intraperitoneally 15 min before training section. The effects of midazolan and penehyclidine hydrochloride on memory consolidation,drugs administrated immediately after training section to test memory consolidation.Midazolam, penehyclidine hydrochloride or normal saline was injected intraperitoneally immediately after training section respectively. Positive drug sodium nitrite was injected subcutaneously. The effects of midazolan and penehyclidine hydrochloride on memory retrieval, drugs administrated before testing section to test memory retrieval. Thirty min before testing section, midazolam was injected intraperitoneally, or positive drug ethanol was gavaged. Fifteen min before testing section, penehyclidine hydrochloride, or normal saline was injected intraperitoneally Results Midazolam impaired memory acquisition and consolidation when single administrated or associated with penehyclidine hydrochloride. Midazolam associated with penehyclidine hydrochloride did not worsen the effect on memory acquisition, but inhibited the effect on memory consolidation significantly. Midazolam alone or associated with penehyclidine did not impair memory retrieval processes. Penehyclidine hydrochloride alone did not impair memory acquisition,consolidation and retrieval processes. Conclusion The effects of midazolam and penehyclidine hydrochloride on learning and memory are advantageous for preventing awareness during surgical procedures.