Effects of lamotrigine on field potentials, propagation, and long-term potentiation in rat prefrontal cortex in multi-electrode recording

被引:13
作者
Huang, CW [1 ]
Hsieh, YJ
Tsai, JJ
Huang, CC
机构
[1] Natl Cheng Kung Univ, Med Ctr, Inst Clin Chem, Dept Neurol, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Med Ctr, Dept Pediat, Tainan 70101, Taiwan
[3] Chi Mei Fdn Hosp, Dept Pediat, Tainan, Taiwan
关键词
lamotrigine; prefrontal cortex; presynaptic fiber volleys; excitatory post-synaptic potential; long-term potentiation;
D O I
10.1002/jnr.20797
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Lamotrigine (LTG) is an anti-epileptic drug that is widely used clinically in various neuropsychiatric disorders. Although consensus is found on the general mode of action by LTG on voltage-gated sodium current, its effect on field potential, neuropropagation, and longterm potentiation, especially in prefrontal cortex (PFC), is still not understood completely. We investigated LTG effects on synaptic response in rat prefrontal cortical slice with the aid of a novel multi-electrode dish (MED64) system. The amplitude and propagation of field excitatory postsynaptic potentials (fEPSP), presynaptic fiber volleys (PrV) were expressed dimensionally in the MED64 system. Lamotrigine (3-100 mu M) inhibited the amplitude and propagation of fEPSP and PrV in a concentration dependent manner. It exerted a predominant presynaptic action, as indicated by the increment in paired-pulse facilitation. Stimulating dependency with reduction fEPSP was seen in the presence of LTG at clinically relevant concentrations as well as with PrV, both in amplitude and propagation. In addition, the depression of PrV amplitudes in the presence of LTG showed a use-dependent fashion. As to LTP in PFC, it was not fEPSP amplitude but propagation reduced by LTG. In PFC, LTG exerts its use- and concentration-dependent inhibitory effect on presynaptic action and depresses fEPSP amplitude and propagation in a clinically relevant concentration. LTP was preserved in its fEPSP amplitude but not propagation in PFC in the presence of LTG. (c) 2006 Wiley-Liss, Inc.
引用
收藏
页码:1141 / 1150
页数:10
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