L-type Ca2+ channels contribute to current-evoked spike firing and associated Ca2+ signals in cerebellar Purkinje neurons.
L-type Ca2+ channels contribute to current-evoked spike firing and associated Ca2+ signals in cerebellar Purkinje neurons.
复制标题
L 型 Ca2 通道有助于小脑浦肯野神经元中电流诱发的尖峰放电和相关 Ca2 信号。
DOI：
10.1080/14734220600719692
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Gullette,CE
中科院分区：
文献类型：
--
作者：
Gruol,DL;Netzeband,JG;Schneeloch,J;Gullette,CE
The physiological properties of Purkinje neurons play a central role in their ability to regulate information transfer through the cerebellum. A number of ion channels contribute to Purkinje neuron physiology including an abundance of P-type Ca2+channels, particularly in the dendritic region. Purkinje neurons also express L-type Ca2+channels both during development and in the mature state. However, a role for L-type channels in Purkinje neuron physiology has yet to be fully defined. In the current study we used physiological recordings from cultured Purkinje neurons and the L-type Ca2+channel agonist S-(2)-Bay K to assess a potential role for L-type Ca2+channels in spike firing. Results show that Bay K alters current-evoked spike firing in young, immature Purkinje neurons without dendritic structure and in older, more mature Purkinje neurons with dendritic structure. Bay K also enhanced Ca2+signals associated with the current-evoked spike firing. The effect of Bay K was more prominent in the young Purkinje neurons than in the older Purkinje neurons, suggesting that L-type Ca2+channels may be more important in the Purkinje neuron physiology during the early stages of development rather than at mature stages. In the older Purkinje neurons, immunohistochemical studies using antibodies to L-type Ca2+channels showed more intense immunolabeling in the somatic region than in the dendritic region. This result suggests that L-type Ca2+channels may play a more important role in somatic physiology than dendritic physiology, whereas P-type channels may play a more important role in dendritic physiology.
