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.
复制标题
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
中科院分区:
文献类型:
--
作者:
Wiebke Hirdes;Crenguta Dinu;C. Bauer;U. Boehm;J. Schwarz
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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影响因子:
4.8
作者:
Turgeon,JL;Waring,DW
通讯作者:
Waring,DW
影响因子:
20.1
作者:
Spector, PS;Curran, ME;Sanguinetti, MC
通讯作者:
Sanguinetti, MC
DOI:
10.1210/mend.15.7.0668
发表时间:
2001
期刊:
Molecular endocrinology (Baltimore, Md.)
影响因子:
--
作者:
VanGoor,F;Zivadinovic,D;Stojilkovic,SS
通讯作者:
Stojilkovic,SS
影响因子:
4.8
作者:
Waring,DennisW;Turgeon,JudithL
通讯作者:
Turgeon,JudithL
DOI:
10.1073/pnas.85.17.6566
发表时间:
1988
影响因子:
11.1
作者:
Shangold,GA;Murphy,SN;Miller,RJ
通讯作者:
Miller,RJ