Urocortin3 in the Posterodorsal Medial Amygdala Mediates Stress-induced Suppression of LH Pulsatility in Female Mice.

Urocortin3 in the Posterodorsal Medial Amygdala Mediates Stress-induced Suppression of LH Pulsatility in Female Mice.
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杏仁内侧背侧核中的Urocortin 3介导了应激诱导的雌性小鼠促黄体生成素搏动抑制。

DOI:
10.1210/endocr/bqab206
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发表时间:
2021-12-01
期刊:
影响因子:
4.8
通讯作者:
O'Byrne KT
O'Byrne KT
中科院分区:
医学2区
文献类型:
--
作者:
Ivanova D;Li XF;McIntyre C;Liu Y;Kong L;O'Byrne KT

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社会心理压力会扰乱生殖并干扰脉动性 LH 分泌。后背内侧杏仁核 (MePD) 是生殖轴和压力的上游调节器。在啮齿动物的 MePD 中,促肾上腺皮质激素释放因子 2 型受体 (CRFR2) 在社会心理压力下被激活,同时 CRFR2 配体 Urocortin3 (Ucn3) 的表达增加。我们研究 MePD 中的 Ucn3 信号传导是否参与介导心理社会压力对 LH 搏动的抑制作用。首先,我们将 Ucn3 注射到 MePD 中并监测对卵巢切除小鼠 LH 脉冲的影响。接下来,我们在存在捕食者气味、2,4,5-三甲基噻唑 (TMT) 的情况下在 MePD 内递送 Astressin2B(一种选择性 CRFR2 拮抗剂),并检查对 LH 脉冲的影响。随后,我们用专门由针对 MePD Ucn3 神经元的设计药物 (DREADD) 激活的抑制设计受体病毒感染 Ucn3-cre-tdTomato 小鼠,同时将小鼠暴露于 TMT 或束缚应激,并检查对 LH 搏动以及皮质酮释放的影响。将 Ucn3 施用到 MePD 中会剂量依赖性地抑制 LH 脉冲,而施用 Astressin2B 则会阻断 TMT 对 LH 搏动的抑制作用。此外,DREADDs 对 MePD Ucn3 神经元的抑制可阻断 TMT 并抑制应激诱导的 LH 脉冲和皮质酮释放的抑制。这些结果首次证明 MePD 中的 Ucn3 神经元介导社会心理应激引起的 GnRH 脉冲发生器和皮质酮分泌的抑制。 MePD 中的 Ucn3 信号在调节下丘脑-垂体-性腺轴和下丘脑-垂体-肾上腺轴中发挥作用,并且该脑位点可能代表生殖轴和应激轴之间相互作用的节点中心。
Psychosocial stress disrupts reproduction and interferes with pulsatile LH secretion. The posterodorsal medial amygdala (MePD) is an upstream modulator of the reproductive axis and stress. Corticotropin-releasing factor type 2 receptors (CRFR2s) are activated in the presence of psychosocial stress together with increased expression of the CRFR2 ligand Urocortin3 (Ucn3) in the MePD of rodents. We investigate whether Ucn3 signalling in the MePD is involved in mediating the suppressive effect of psychosocial stress on LH pulsatility. First, we administered Ucn3 into the MePD and monitored the effect on LH pulses in ovariectomized mice. Next, we delivered Astressin2B, a selective CRFR2 antagonist, intra-MePD in the presence of predator odor, 2,4,5-trimethylthiazole (TMT) and examined the effect on LH pulses. Subsequently, we virally infected Ucn3-cre-tdTomato mice with inhibitory designer receptor exclusively activated by designer drugs (DREADDs) targeting MePD Ucn3 neurons while exposing mice to TMT or restraint stress and examined the effect on LH pulsatility as well as corticosterone release. Administration of Ucn3 into the MePD dose-dependently inhibited LH pulses and administration of Astressin2B blocked the suppressive effect of TMT on LH pulsatility. Additionally, DREADDs inhibition of MePD Ucn3 neurons blocked TMT and restraint stress-induced inhibition of LH pulses and corticosterone release. These results demonstrate for the first time that Ucn3 neurons in the MePD mediate psychosocial stress-induced suppression of the GnRH pulse generator and corticosterone secretion. Ucn3 signalling in the MePD plays a role in modulating the hypothalamic-pituitary-gonadal and hypothalamic-pituitary-adrenal axes, and this brain locus may represent a nodal center in the interaction between the reproductive and stress axes.
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