自发性癫痫大鼠脑海马两种锌转运体表达的研究

目的 探讨反复癫痫发作后的自发性癫痫大鼠(SER)与正常Wistar大鼠脑海马锌转运体1和3的表达与癫痫的相关性,以及癫痫发作后脑海马内含锌神经元内锌稳态的改变情况.方法 应用Western blot和RT-PCR方法分析反复癫痫发作后的SER与正常Wistar大鼠脑海马锌转运体1和3表达情况.结果 SER反复癫痫发作后脑海马锌转运体1蛋白及mRNA表达均明显高于正常Wistar大鼠,差异有统计学意义(P<0.05);锌转运体3蛋白表达与正常Wistar大鼠相比无明显改变,差异无统计学意义(P>0.05).结论 反复癫痫发作后SER脑海马可能在神经元尤其突触后神经元内出现锌浓度增高现象,锌转运体1表达上调可通过降低神经元内Zn2+水平对抗癫痫发作引起的神经元损伤,从而起到保护神经元的作用.

Expression of two zinc transporters in the hippocampus of spontaneously epileptic rats

Objective To explore the correlation between hippocampal zinc transporter 1 and 3 expressions and epilepsy in spontaneously epileptic rats (ESRs) and normal rats, and observe the alternations of zinc homeostasis in zinc-containing neurons after seizure. Methods Western blot and RT-PCR were used to detect zinc transporter 1 and 3 expressions in the hippocampus of both ESRs with recurrent seizures and normal Wistar rats. Results At both the mRNA and protein levels, hippocampal zinc transporter 1 expression in ESRs with recurrent seizures was significantly higher than that in normal Wistar rats, while hippocampal zinc transporter 3 protein expression was comparable between the two groups. Conclusion Hippocampal zinc transporter 1 expression is up-regnlated and Zn2+ in the hippocampal neurons, especially the post-synaptic neurons, can be elevated in ESRs after recurrent seizure. Up-regulated zinc transporter 1 expression in the hippocampus may protect the neurons against seizure-induced injuries by decreasing Zn2+ levels in the neurons.