Rhythmic clock and neuropeptide gene expression in hypothalamic mHypoE-44 neurons

Rhythmic clock and neuropeptide gene expression in hypothalamic mHypoE-44 neurons
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下丘脑 mHypoE-44 神经元的节律时钟和神经肽基因表达

DOI:
10.1016/j.mce.2010.02.042
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发表时间:
2010
影响因子:
4.1
通讯作者:
D. Belsham
D. Belsham
中科院分区:
医学2区
文献类型:
--
作者:
L. J. Fick;G. Fick;D. Belsham

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特异性时钟基因Bmal 1、Per 2、Clock和Rev-Erbα以及特异性下丘脑神经肽NPY、Crh、AgRP、神经降压素和preproghrelin在克隆性下丘脑神经元细胞系中表达的节律性表达使用新型非线性最小二乘统计分析进行测定和分析,以确定体外环境中的节律性。神经肽启动子区的计算机分析确定了推定的E盒基序,并且NPY启动子中的基序以振荡方式结合。在mHypoE-44神经元中,我们证明了四个核心昼夜节律成分:Bmal 1,Clock,Per 2和Rev-Erbα的mRNA以大约24小时的节律振荡。NPY和NT在24 h基因表达显著。然而,CRH和preproghrelin mRNA循环显着的ultradian方式,振荡约每18小时。AgRP mRNA表达无明显节律性。我们推测,内源性节律性神经肽的表达有助于神经内分泌稳态,其中可能包括能量平衡。
The rhythmic expression of specific clock genes: Bmal1, Per2, Clock and Rev-Erbα; and specific hypothalamic neuropeptides: NPY, Crh, AgRP, neurotensin and preproghrelin, expressed in clonal hypothalamic neuronal cell lines, was assayed and analyzed using a novel non-linear least squares statistical analysis to determine rhythmicity in an in vitro milieu. In silico analysis of the neuropeptide promoter regions identified putative E-box motifs and a motif in the NPY promoter is bound to in an oscillatory fashion. Within the mHypoE-44 neurons, we demonstrate that mRNA of four core circadian components: Bmal1, Clock, Per2 and Rev-Erbα, oscillate with approximate 24h rhythms. NPY and NT demonstrated significant 24h gene expression. However, CRH and preproghrelin mRNA cycled significantly in an ultradian fashion, oscillating approximately every 18h. AgRP mRNA did not show a significant rhythm. We speculate that endogenous rhythmic neuropeptide expression contributes to neuroendocrine homeostasis, which may include energy balance.
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