氟西汀对大鼠创伤后应激障碍预防作用的实验研究

目的 探讨氟西汀对大鼠创伤后应激障碍模型的预防作用.方法 采用单一延长应激(SPS)动物模型,以溶剂(蒸馏水)为对照组,以应激后用2种不同浓度的氟西汀干预为实验组.在SPS结束后第15～21天,测试旷场实验、高架十字实验、MWM水迷宫实验,分别评定大鼠对环境的恐惧反应,高警觉性,焦虑/抑郁行为以及学习记忆能力.结果 在旷场实验中,大鼠水平活动度、中央活动时间组间差异有显著性(P<0.05),模型组两指标[(4678.85±495.33)mm,(22.15±3.43)s]均显著低于空白对照组[(9276.74±805.35)mm,(35.66 ±3.17)s,P<0.05],氟西汀干预组显著高于模型组[F1(8895.85±599.78)mm,(40.23±4.32)s;F2(8654.07±866.05)mm,(41.57±4.34)8,P<0.05].在高架十字测试中,大鼠开臂进入次数的百分比和停留时间存在组间差异(P<0.05).模型组[(23.67±2.87)%,(12.46±2.55)%]2指标均显著低于空白对照组[(37.21±2.34)%,(18.08±2.22)%,P<0.05],氟西汀干预组[F1(32.62±4.57)%,(17.58±3.23)%;F2(39.75±4.46)%,(019.74 ±4.44)%]显著高于模型组(P<0.05).在MWM水迷宫实验中,上台潜伏期存在组间差异,模型组潜伏期高于空白对照组和氟西汀干预组.模型组在靶象限活动时间百分比和穿越站台次数显著低于其他组.结论 早期给予氟西汀可以明显改善大鼠对环境的恐惧反应,高警觉性,焦虑/抑郁以及学习记忆能力.

The primary study of fluoxetine in the prevention of post-traumatic stress disorder

Objective To observe the effect of fluoxetine on the single prolonged stress model which mimic the post-traumatic stress disorder (PTSD). Methods Rats receiving single prolonged stress (SPS) (2 h restraint + 20 min FST + anaesthesized to lose consciousness with ethylether) or not were given fluoxetine or tap water for 15 days. Elevated plus maze(EPM),open-field test(OF) and morris water maze(MWM) tests were used to evaluate rats' fear response to environment,high alertness,anxiety & depression behavior,and learning and memory ability. Results In open field test, group of fluoxetine(F1 (8895. 85 ± 599. 78) mm, (40. 23 ±4. 32) s;F2 (8654.07 ±866.05)mm,(41.57 ±4.34)s, P<0.05) showed significant increase in activity times and horizontal motion distance compared with group of SPS (4678.85 ±495.33)mm, (22.15 ±3.43)s, P<0.05). In EPM experiment,group of fluoxetine(F1 (32. 62 ± 4. 57)% , (17. 58 ± 3. 23)% ; F2 (39. 75 ± 4. 46)% , (19. 74 ± 4.44) %) showed significant increase in percentage of the open-arm into the maze and percentage of the open arm pause compared with group of SPS ((23.67 ±2. 87)% ,(12.46 ±2.55)% , P<0.05). In MWM experiment,the escape latency of the SPS group increased significantly in comparison to that in sham group (P<0.01) and fluoxetine group. Fluoxetine significantly reversed the SPS-induced decrease in time spent in the target quadrant (P< 0.05). Conclusion Added fluoxetine can obviously improve rats' fear response to environment ,high alertness ,anxiety & depression behavior as well as learning and memory ability.