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首页> 外文期刊>The European Journal of Neuroscience >In vivo blockade of neural activity alters dendritic development of neonatal CA1 pyramidal cells.
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In vivo blockade of neural activity alters dendritic development of neonatal CA1 pyramidal cells.

机译:体内神经活动的阻滞改变新生儿CA1锥体细胞的树突状发育。

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摘要

During development, neural activity has been proposed to promote neuronal growth. During the first postnatal week, the hippocampus is characterized by an oscillating neural network activity and a rapid neuronal growth. In the present study we tested in vivo, by injecting tetanus toxin into the hippocampus of P1 rats, whether this neural activity indeed promotes growth of pyramidal cells. We have previously shown that tetanus toxin injection leads to a strong reduction in the frequency of spontaneous GABA and glutamatergic synaptic currents, and to a complete blockade of the early neural network activity during the first postnatal week. Morphology of neurobiotin-filled CA1 pyramidal cells was analyzed at the end of the first postnatal week (P6-10). In activity-reduced neurons, the total length of basal dendritic tree was three times less than control. The number, but not the length, of basal dendritic branches was affected. The growth impairment was restricted to the basal dendrites. The apical dendrite, the axons, or the soma grew normally during activity deprivation. Thus, the in vivo neural activity in the neonate hippocampus seems to promote neuronal growth by initiating novel branches.
机译:在开发过程中,已经提出了神经活动来促进神经元生长。在产后的第一个星期,海马的特征是神经网络的振荡和神经元的快速生长。在本研究中,我们通过将破伤风毒素注射到P1大鼠的海马体内进行了体内测试,该神经活动是否确实促进了锥体细胞的生长。先前我们已经表明,注射破伤风毒素会导致自发GABA和谷氨酸能突触电流的频率大大降低,并在产后第一周完全阻断早期神经网络活动。在出生后的第一周(P6-10)结束时分析了充满神经生物素的CA1锥体细胞的形态。在活动减少的神经元中,基础树突树的总长度比对照少三倍。基底树突分支的数量而不是长度受到影响。生长障碍仅限于基底树突。活动剥夺期间,顶端树突,轴突或躯体正常生长。因此,新生海马体内的神经活动似乎通过启动新的分支来促进神经元的生长。

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