Activity-dependent initiation of a prolonged depolarization in aplysia bag cell neurons: role for a cation channel.
Activity-dependent initiation of a prolonged depolarization in aplysia bag cell neurons: role for a cation channel.
复制标题
海兔袋细胞神经元长时间去极化的活动依赖性启动:阳离子通道的作用。
DOI:
--
复制
发表时间:
2007
影响因子:
2.5
通讯作者:
N. S. Magoski
中科院分区:
文献类型:
--
作者:
A. Hung;N. S. Magoski
The translation of prior activity into changes in excitability is essential for memory and the initiation of behavior. After brief synaptic input, the bag cell neurons of Aplysia californica undergo a nearly 30-min afterdischarge to release egg-laying hormone. The present study examines a prolonged depolarization in cultured bag cell neurons. A 5-Hz, 10-s action potential train elicited a depolarization of about 10 mV, which lasted </=30 min and was reduced by calmodulin kinase inhibition. Very broad action potentials (resulting from TEA application) decreased prolonged depolarization amplitude, indicating that strong Ca(2+) influx did not necessarily promote the response. The prolonged depolarization current (I(PD)) was recorded after 5-Hz, 10-s trains of square voltage pulses of varying duration (10-150 ms). Despite Ca(2+) influx increasing steadily with pulse duration, I(PD) was most reliably initiated at 100 ms, suggesting a Ca(2+) window or limit exists for triggering I(PD). Consistent with this, modestly broader action potentials, evoked by lengthening the train current-pulse duration, resulted in smaller prolonged depolarizations. With respect to the properties of I(PD), it displayed a linear current-voltage relationship with a reversal potential of about -45 mV that was shifted to approximately -25 mV by lowering internal K(+) or about -56 mV by lowering external Na(+) and Ca(2+). I(PD) was blocked by Gd(3+), but was not antagonized by MDL-123302A, SKF-96365, 2-APB, tetrodotoxin, or flufenamic acid. Optimal Ca(2+) influx may activate calmodulin kinase and a voltage-independent, nonselective cation channel to initiate the prolonged depolarization, thereby contributing to the afterdischarge and reproduction.
登录
查看更多内容
DOI:
10.1016/b978-0-12-152831-7.50007-x
发表时间:
1990
期刊:
Current topics in cellular regulation
影响因子:
--
作者:
Colbran,RJ;Soderling,TR
通讯作者:
Soderling,TR
影响因子:
2.5
作者:
HajDahmane, S;Andrade, R
通讯作者:
Andrade, R
DOI:
10.1073/pnas.83.9.2914
发表时间:
1986
影响因子:
11.1
作者:
Weissmann,G;Azaroff,L;Davidson,S;Dunham,P
通讯作者:
Dunham,P
影响因子:
4.4
作者:
Soong,HK;Cintron,C
通讯作者:
Cintron,C
DOI:
10.1073/pnas.95.18.10938
发表时间:
1998
影响因子:
11.1
作者:
Wilson,GF;Magoski,NS;Kaczmarek,LK
通讯作者:
Kaczmarek,LK