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首页> 外文期刊>Neuron >Hilar Mossy Cell Degeneration Causes Transient Dentate Granule Cell Hyperexcitability and Impaired Pattern Separation
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Hilar Mossy Cell Degeneration Causes Transient Dentate Granule Cell Hyperexcitability and Impaired Pattern Separation

机译:肺血管藓细胞变性导致瞬时牙齿颗粒细胞过度兴奋性和减损的图案分离

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Although excitatory mossy cells of the hippocampal hilar region are known to project both to dentate granule cells and to interneurons, it is as yet unclear whether mossy cell activity's net effect on granule cells is excitatory or inhibitory. To explore their influence on dentate excitability and hippocampal function, we generated a conditional transgenic mouse line, using the Cre/. loxP system, in which diphtheria toxin receptor was selectively expressed in mossy cells. One week after injecting toxin into this line, mossy cells throughout the longitudinal axis were degenerated extensively, theta wave power of dentate local field potentials increased during exploration, and deficits occurred in contextual discrimination. By contrast, we detected no epileptiform activity, spontaneous behavioral seizures, or mossy-fiber sprouting 5-6 weeks after mossy cell degeneration. These results indicate that the net effect of mossy cell excitation is to inhibit granule cell activity and enable dentate pattern separation. Jinde et al. demonstrate that while hilar mossy cell genetic ablation causes transient granule cell hyperexcitability, there is neither mossy fiber sprouting nor epilepsy afterwards. Mossy cell loss, seen in temporal lobe epilepsy, appears to be insufficient for epileptogenesis.
机译:虽然已知海马欧拉门伦地区的兴奋性肿瘤细胞既缺乏牙齿颗粒细胞和中间核素,但目前尚不清楚苔藓细胞活性是否对颗粒细胞的净效应是兴奋性或抑制性的。为了探讨它们对牙齿兴奋性和海马功能的影响,我们使用CRE /产生了条件转基因小鼠线。 LOXP系统,其中白喉毒素受体在苔藓细胞中选择性地表达。在将毒素注入到这条线后一周后,在整个纵向轴线的苔藓细胞广泛退化,仪表局部局部电位的Theta波动在勘探期间增加,并且在上下文鉴别中发生缺陷。相比之下,我们检测到在苔藓细胞变性的患有血管细胞变性后5-6周发芽的癫痫型活性,自发行为癫痫发作或苔藓纤维。这些结果表明苔藓细胞激发的净效应是抑制颗粒细胞活性并使齿状图案分离能够。金德等。证明虽然蚕茧苔藓细胞遗传烧蚀导致瞬时颗粒细胞过度兴奋性,但之后既没有苔藓纤维骤冷纤维发芽也没有癫痫。在颞叶癫痫中看到的苔藓细胞损失似乎是癫痫发生的不足。

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    《Neuron》 |2012年第6期|共12页
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  • 正文语种 eng
  • 中图分类 神经病学;
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