...
首页> 外文期刊>Progress in brain research >Hypothalamic and limbic expression of CRF and vasopressin during lactation: implications for the control of ACTH secretion and stress hyporesponsiveness.
【24h】

Hypothalamic and limbic expression of CRF and vasopressin during lactation: implications for the control of ACTH secretion and stress hyporesponsiveness.

机译:泌乳过程中CRF和血管加压素的下丘脑和边缘表达:对控制ACTH分泌和应激低反应性的影响。

获取原文
获取原文并翻译 | 示例
           

摘要

Lactation is associated with physiological and behavioral changes that optimize conditions for development of the offspring. Although neuroendocrine and emotional stress responses are blunted, the central mechanisms involved are unclear. In addition to a reduction in stimulatory noradrenergic inputs to paraventricular nucleus (PVN) neurons, we demonstrate that lactation induces: (1) unique phenotypic changes in neuropeptide expression by hypothalamic PVN neurons (reduced expression of corticotropin-releasing factor (CRF) mRNA and increased expression of vasopressin mRNA in parvocellular PVN neurons); and (2) changes in pituitary sensitivity to CRF (reduced) and vasopressin (increased) as a consequence of differential CRF/vasopressin secretion into the hypophysial portal blood. Neurons in the bed nucleus of the stria terminalis (BNST) and the central amygdala (CeA) that are implicated in the control of the hypothalamopituitary-adrenal axis also display changes in lactation: expression of CRF mRNA in the CeA is reduced, consistent with the diminished responsiveness to acoustic startle observed in nursing mothers. In contrast, expression of CRF mRNA is increased in the dorsolateral portion of the BNST, probably because of the tonic increases in endogenous glucocorticoid production during this period. Using immuno-targeted lesions of CRF or vasopressin in the PVN of virgin females, we have shown that CRF neurons of the PVN send inhibitory projections to the dorsolateral portion of the BNST and stimulatory inputs to CRF neurons in the CeA. Thus, it is possible that lactation-induced changes in the activity of parvocellular PVN neurons might also modulate the expression of neuropeptides and neurotransmitters in the BNST and the amygdala.
机译:泌乳与生理和行为变化有关,这些变化优化了后代的发育条件。尽管神经内分泌和情绪应激反应减弱,但所涉及的中心机制尚不清楚。除了减少对脑室旁核(PVN)神经元的刺激性去甲肾上腺素输入之外,我们还证明了泌乳诱导:(1)下丘脑PVN神经元在神经肽表达中的独特表型改变(促肾上腺皮质激素释放因子(CRF)mRNA的表达降低和增加小细胞PVN神经元中加压素mRNA的表达(2)由于CRF /血管加压素分泌到体下门静脉血中的差异,导致垂体对CRF(降低)和加压素(增加)的敏感性变化。与下丘脑-垂体-肾上腺轴的控制有关的终末层(BNST)和中央杏仁核(CeA)床核中的神经元也表现出泌乳改变:CeA中CRF mRNA的表达减少,与降低了哺乳母亲对听觉惊吓的反应能力。相反,CRF mRNA的表达在BNST的背外侧部分增加,这可能是由于在此期间内源性糖皮质激素产生的补品增加。使用处女雌性PVN中CRF或血管加压素的免疫靶向病变,我们显示PVN的CRF神经元向BNST的背外侧部分发送抑制性投射,并向CeA中的CRF神经元发送刺激性输入。因此,哺乳引起的小细胞PVN神经元活性变化也可能会调节BNST和杏仁核中神经肽和神经递质的表达。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号