Gonadotropin-releasing hormone inhibits ether-à-go-go-related gene K+ currents in mouse gonadotropes.

Gonadotropin-releasing hormone inhibits ether-à-go-go-related gene K+ currents in mouse gonadotropes.
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促性腺激素释放激素抑制小鼠促性腺激素中与 ether-à-go-go 相关的基因 K+ 电流。

DOI:
10.1210/en.2009-0718
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发表时间:
2010
期刊:
影响因子:
4.8
通讯作者:
J. Schwarz
J. Schwarz
中科院分区:
医学2区
文献类型:
--
作者:
Wiebke Hirdes;Crenguta Dinu;C. Bauer;U. Boehm;J. Schwarz

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促性腺激素分泌 LH 是由 GnRH 诱导的细胞内 Ca(2+) 浓度增加 ([Ca(2+)](i)) 启动的。 [Ca(2+)](i) 的增加是细胞内储存的 Ca(2+) 释放和 Ca(2+) 通过电压依赖性 Ca(2+) 通道流入的结果。在这里,我们描述了小鼠原代促性腺激素中的ether-à-go-go相关基因(erg)K(+)电流及其在控制Ca(2+)流入中的可能功能。为了检测促性腺激素,我们使用了敲入小鼠品系,其中表达 GnRH 受体的细胞被荧光标记。 80-90% 的促性腺激素记录了 Erg K(+) 电流。 E-4031 阻断 erg 电流使静息电位去极化 5-8 mV,并导致 [Ca(2+)](i) 增加,但硝苯地平可消除这种增加。 GnRH 通过降低最大 erg 电流来抑制 erg 电流,并且在某些细胞中还通过将激活曲线移动到更正的电位来抑制 erg 电流。总之,erg 电流有助于维持促性腺激素的静息电位,从而通过限制 Ca(2+) 流入来确保低 [Ca(2+)](i)。此外,erg 通道由 GnRH 通过迄今未知的信号级联进行调制。
Secretion of LH from gonadotropes is initiated by a GnRH-induced increase in intracellular Ca(2+) concentration ([Ca(2+)](i)). This increase in [Ca(2+)](i) is the result of Ca(2+) release from intracellular stores and Ca(2+) influx through voltage-dependent Ca(2+) channels. Here we describe an ether-à-go-go-related gene (erg) K(+) current in primary mouse gonadotropes and its possible function in the control of Ca(2+) influx. To detect gonadotropes, we used a knock-in mouse strain, in which GnRH receptor-expressing cells are fluorescently labeled. Erg K(+) currents were recorded in 80-90% of gonadotropes. Blockage of erg currents by E-4031 depolarized the resting potential by 5-8 mV and led to an increase in [Ca(2+)](i), which was abolished by nifedipine. GnRH inhibited erg currents by a reduction of the maximal erg current and in some cells additionally by a shift of the activation curve to more positive potentials. In conclusion, the erg current contributes to the maintenance of the resting potential in gonadotropes, thereby securing a low [Ca(2+)](i) by restricting Ca(2+) influx. In addition, the erg channels are modulated by GnRH by an as-yet unknown signal cascade.
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