Facilitatory and inhibitory role of central amylin administration in the regulation of the gonadotropin-releasing hormone pulse generator activity in goats

Facilitatory and inhibitory role of central amylin administration in the regulation of the gonadotropin-releasing hormone pulse generator activity in goats
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中央胰淀素给药在调节山羊促性腺激素释放激素脉冲发生器活性中的促进和抑制作用

DOI:
10.1016/j.neulet.2020.135276
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发表时间:
2020
影响因子:
2.5
通讯作者:
H. and Ohkura. S.
H. and Ohkura. S.
中科院分区:
医学4区
文献类型:
--
作者:
Kitagawa;Y.;Sasaki;T.;Suzumura;R.;Morishima;A.;Tatebayashi;R.;Assadullah;Ieda;N.;Morita;Y.;Matsuyama;S.;Inoue;N.;Uenoyama;Y. Tsukamura;H. and Ohkura. S.

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促性腺激素释放激素(GnRH)的脉冲式分泌是调节哺乳动物生殖功能所必需的。GnRH脉冲是由一个神经机制,称为GnRH脉冲发生器。在本研究中,我们研究了中央降钙素受体(CTR)信号在调节GnRH脉冲发生器的活动在卵巢切除山羊管理胰淀素,CTR的内源性配体,进入侧脑室的作用。GnRH脉冲发生器的活动测量使用多单位活动(MUA)记录在下丘脑内侧基底。我们分析了MUA(MUA截击)特征性增加的间隔变化。胰淀素给药后,MUA齐射间期立即缩短,随后间期延长。KISS 1(kisspeptin基因)和CALCR(CTR基因)的双原位杂交结果显示,在弓状核kisspeptin神经元中发现了低水平的CALCR表达,而弓状核kisspeptin神经元是参与GnRH脉冲发生器活动的主要神经元群。这些结果表明,中央amylin-CTR信号有一个双相的作用,在调节GnRH脉冲发生器的活动,作用于细胞以外的弓状kisspeptin在山羊神经元。
Pulsatile gonadotropin-releasing hormone (GnRH) secretion is essential for regulating reproductive functions in mammals. GnRH pulses are governed by a neural mechanism that is termed the GnRH pulse generator. In the present study, we investigated the role of central calcitonin receptor (CTR) signaling in the regulation of the GnRH pulse generator activity in ovariectomized goats by administering amylin, an endogenous ligand for CTR, into the lateral ventricle. GnRH pulse generator activity was measured using multiple unit activity (MUA) recordings in the mediobasal hypothalamus. We analyzed changes in the interval of characteristic increases in MUA (MUA volleys). The MUA volley interval shortened immediately after amylin administration, followed by prolonged intervals. Doublein situhybridization forKISS1(kisspeptin gene) andCALCR(CTR gene) revealed that low expression levels ofCALCRwere found in the arcuate kisspeptin neurons, which is suggested as the main population of neurons, involved in GnRH pulse generator activity. These results suggest that central amylin-CTR signaling has a biphasic role in the regulation of GnRH pulse generator activity by acting on cells other than the arcuate kisspeptin neurons in goats.
在切除卵巢的哺乳大鼠中,在哺乳后期,黄体生成素分泌的抑制作用被消除。
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DOI: --
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