GPR54-dependent stimulation of luteinizing hormone secretion by neurokinin B in prepubertal rats.

GPR54-dependent stimulation of luteinizing hormone secretion by neurokinin B in prepubertal rats.
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DOI:
10.1371/journal.pone.0044344
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
O'Byrne KT
O'Byrne KT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Grachev P;Li XF;Lin YS;Hu MH;Elsamani L;Paterson SJ;Millar RP;Lightman SL;O'Byrne KT

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Kisspeptin、神经激肽 B (NKB) 和强啡肽 A (Dyn) 在 KNDy 神经元内共表达,这些神经元从下丘脑弓状核 (ARC) 投射到 GnRH 神经元和许多其他下丘脑靶标。每种 KNDy 神经肽都与调节脉冲式 GnRH/LH 分泌有关。一般来说,Kisspeptin 会刺激 LH 分泌,而 Dyn 会抑制 LH 分泌。然而,NKB 类似物 Senktide 已被多种报道抑制、刺激 LH 分泌或对 LH 分泌没有影响。在青春期前的小鼠、大鼠和猴子中,senktide 可刺激 LH 分泌。此外,在猴子中,这种效应依赖于 Kisspeptin 通过其受体 GPR54 发出的信号。本研究测试了以下假设:NKB 对完整大鼠 LH 分泌的刺激作用是由 Kisspeptin/GPR54 信号传导介导的,并且与 Dyn 音调无关。为了测试这一点,在脑室内注射 KNDy 神经肽类似物之前和之后,对卵巢完整的青春期前大鼠进行频繁的自动血液采样。 Senktide 强烈诱导单次 LH 脉冲,而 GPR54 拮抗剂 Kp-234 以及 Dyn 激动剂和拮抗剂(分别为 U50488 和 Nor-BNI)均对基础 LH 水平没有影响。然而,Kp-234 有效阻断senktide 诱导的 LH 脉冲。 U50488 或 Nor-BNI 对 Dyn 音调的调节不影响 Senktide 诱导的 LH 脉冲。这些数据表明,NKB 对完整雌性大鼠中 LH 分泌的刺激作用依赖于 Kisspeptin/GPR54 信号传导,但不依赖于 Dyn 信号传导。
Kisspeptin, neurokinin B (NKB) and dynorphin A (Dyn) are coexpressed within KNDy neurons that project from the hypothalamic arcuate nucleus (ARC) to GnRH neurons and numerous other hypothalamic targets. Each of the KNDy neuropeptides has been implicated in regulating pulsatile GnRH/LH secretion. In isolation, kisspeptin is generally known to stimulate, and Dyn to inhibit LH secretion. However, the NKB analog, senktide, has variously been reported to inhibit, stimulate or have no effect on LH secretion. In prepubertal mice, rats and monkeys, senktide stimulates LH secretion. Furthermore, in the monkey this effect is dependent on kisspeptin signaling through its receptor, GPR54. The present study tested the hypotheses that the stimulatory effects of NKB on LH secretion in intact rats are mediated by kisspeptin/GPR54 signaling and are independent of a Dyn tone. To test this, ovarian-intact prepubertal rats were subjected to frequent automated blood sampling before and after intracerebroventricular injections of KNDy neuropeptide analogs. Senktide robustly induced single LH pulses, while neither the GPR54 antagonist, Kp-234, nor the Dyn agonist and antagonist (U50488 and nor-BNI, respectively) had an effect on basal LH levels. However, Kp-234 potently blocked the senktide-induced LH pulses. Modulation of the Dyn tone by U50488 or nor-BNI did not affect the senktide-induced LH pulses. These data demonstrate that the stimulatory effect of NKB on LH secretion in intact female rats is dependent upon kisspeptin/GPR54 signaling, but not on Dyn signaling.
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