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.
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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:
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发表时间:
2007
影响因子:
2.5
通讯作者:
N. S. Magoski
N. S. Magoski
中科院分区:
医学3区
文献类型:
--
作者:
A. Hung;N. S. Magoski

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将先前的活动转化为兴奋性的变化对于记忆和行为的启动至关重要。在短暂的突触输入后,加州鸟的袋细胞神经元经历了近30分钟的后放电,释放产卵激素。本研究探讨了培养袋细胞神经元的延长去极化。5 Hz、10 s的动作电位串引起约10 mV的去极化,持续</=30 min,并因钙调蛋白激酶抑制而减少。非常宽的动作电位(由TEA应用引起)降低了延长的去极化幅度,表明强Ca(2+)内流不一定促进反应。在5-Hz,10-s的不同持续时间(10-150 ms)的方波电压脉冲序列后记录延长的去极化电流(I(PD))。尽管Ca(2+)内流随脉冲持续时间稳定增加,但I(PD)在100 ms时启动最可靠,表明存在触发I(PD)的Ca(2+)窗口或限制。与此相一致,适度更广泛的动作电位,通过延长列车电流脉冲持续时间诱发,导致较小的延长去极化。就I(PD)的性质而言,其呈现线性电流-电压关系,其反转电位约为-45 mV,通过降低内部K(+)或降低外部Na(+)和Ca(2+),其反转电位约为-25 mV或约为-56 mV。Gd(3+)可阻断I(PD),但MDL-123302 A、SKF-96365、2-APB、河豚毒素和氟灭酸均不拮抗I(PD)。最佳Ca(2+)内流可激活钙调蛋白激酶和电压非依赖性、非选择性阳离子通道,启动延长的去极化,从而促进后放电和生殖。
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.
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