丰富环境对脑梗死大鼠学习记忆和海马区微血管密度的影响

目的 研究丰富环境对局灶性脑梗死大鼠学习记忆及海马区微血管密度的影响.方法 采用开颅电凝法制作SD大鼠右侧大脑中动脉缺血(MCAO)模型,术后24h随机分为丰富环境组(EE组)和标准环境组(SE组),另设假手术组(Sham组),不电凝大脑中动脉,其余步骤与手术组相同.分别于术后7d、28d进行Mornis水迷宫测试大鼠学习记忆能力;以免疫组织化学法测定海马区微血管密度.结果 在学习记忆能力上,EE组成绩明显优于SE组(P<0.01),与Sham组相比无显著性差异(P>0.05);缺血侧海马区微血管密度显示EE组在术后14d、28d明显高于SE组大鼠(P<0.05),与Sham组相比无显著性差异(P>0.05).结论 丰富环境可促进脑梗死大鼠学习记忆能力的恢复与海马区微血管新生,改善大鼠的预后.

Abstract：

Objective To evaluate the effect of enriched environment on learning and memory and microvessel density in hippocampus of rats after unilateral local cerebral infarction. Methods The right middle cerebral artery occlusion (MCAO) was performed with electric coagulation in SD rats, then the rats were randomly divided into enriched environment stimulation group (EE group) and standard environment stimulation group (SE group). The sham-operation rats were as control group. On 7d and 28d, Morris water maze was used to evaluate the learning and memory ability;microvessel density in hippocampus of rats was measured in the boundary zone to brain infarction on 1d,3d,7d,14d and 28d. Result The learning and memory ability in EE group was significantly better than that in SE group ( P < 0.01 ) and there was no significant difference between EE group and Sham group (P > 0.05 ) ;Compared with SE group, the microvessel density (MVD) of EE group in hippocampus of rats significantly increased on 14d and 28d after MCAO( P <0.05). There was no significant difference in MVD between EE group and sham group (P > 0.05 ). Conclusion The enriched environment can enhance the ability of learning and memory and promote the blood vessel proliferation of rats with unilateral local cerebral infarction.The study suggests enriched environment is good for recovery from brain damage in rats with MCAO.

Effect of enriched environment on learning,memory and microvessel density in hippocampi of rats after unilateral local cerebral infarction

Objective To evaluate the effect of enriched environment on learning and memory and microvessel density in hippocampus of rats after unilateral local cerebral infarction. Methods The right middle cerebral artery occlusion (MCAO) was performed with electric coagulation in SD rats, then the rats were randomly divided into enriched environment stimulation group (EE group) and standard environment stimulation group (SE group). The sham-operation rats were as control group. On 7d and 28d, Morris water maze was used to evaluate the learning and memory ability;microvessel density in hippocampus of rats was measured in the boundary zone to brain infarction on 1d,3d,7d,14d and 28d. Result The learning and memory ability in EE group was significantly better than that in SE group ( P < 0.01 ) and there was no significant difference between EE group and Sham group (P > 0.05 ) ;Compared with SE group, the microvessel density (MVD) of EE group in hippocampus of rats significantly increased on 14d and 28d after MCAO( P <0.05). There was no significant difference in MVD between EE group and sham group (P > 0.05 ). Conclusion The enriched environment can enhance the ability of learning and memory and promote the blood vessel proliferation of rats with unilateral local cerebral infarction.The study suggests enriched environment is good for recovery from brain damage in rats with MCAO.