Dorsal raphé nucleus glucocorticoid receptors inhibit tph2 gene expression in male C57BL/6J mice.

Dorsal raphé nucleus glucocorticoid receptors inhibit tph2 gene expression in male C57BL/6J mice.
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DOI:
10.1016/j.neulet.2017.11.041
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发表时间:
2018-02-05
影响因子:
2.5
通讯作者:
Jacobson L
Jacobson L
中科院分区:
医学4区
文献类型:
--
作者:
Vincent MY;Donner NC;Smith DG;Lowry CA;Jacobson L

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5 -羟色胺能背核(DRN)表达糖皮质激素受体(GR),而系统性糖皮质激素已被证明可以调节色氨酸羟化酶异构体2的表达和活性,这是脑内5 -羟色胺合成的限速酶。我们使用假型腺相关病毒AAV2/9转染绿色荧光蛋白(GFP对照)或Cre重组酶(DRN GR缺失)的DRN内注射,以确定DRN GR是否直接调节色氨酸羟化酶2 (tph2)的DRN mRNA水平。在另一组类似处理的含氟GR小鼠中,我们还测量了边缘前脑区域血清素(5-羟色胺;5-HT)及其主要代谢物5-羟基吲哚乙酸(5-HIAA)的浓度。DRN GR缺失增加了DRN背部、侧翼和尾侧部分的tph2 mRNA水平,但没有改变边缘前脑区域5-HT、5-HIAA的组织浓度或5-HIAA/5-HT的比值。我们得出结论,DRN GR抑制小鼠DRN tph2基因表达,但对血清素代谢没有明显影响,至少在昼夜节律最低点的基础条件下是这样。这些数据提供了DRN GR在小鼠中局部控制DRN tph2 mRNA表达的第一个证据。
The serotonergic dorsal raphé nucleus (DRN) expresses glucocorticoid receptors (GR), and systemic glucocorticoids have been shown to regulate expression and activity of tryptophan hydroxylase isoform 2, the rate-limiting enzyme for serotonin synthesis in brain. We have used intra-DRN injection of pseudotyped adeno-associated virus AAV2/9 transducing either green fluorescent protein (GFP control) or Cre recombinase (DRN GR deletion) in floxed GR mice to determine if DRN GR directly regulate DRN mRNA levels of tryptophan hydroxylase 2 (tph2). In a separate set of similarly-treated floxed GR mice, we also measured limbic forebrain region concentrations of serotonin (5-hydroxytryptamine; 5-HT) and its major metabolite, 5-hydroxyindoleacetic acid (5-HIAA). DRN GR deletion increased tph2 mRNA levels in the dorsal, lateral wing, and caudal parts of the DRN without altering tissue concentrations of 5-HT, 5-HIAA, or the 5-HIAA/5-HT ratio in limbic forebrain regions. We conclude that DRN GR inhibit DRN tph2 gene expression in mice without marked effects on serotonin metabolism, at least under basal conditions at the circadian nadir. These data provide the first evidence of localized control of DRN tph2 mRNA expression by DRN GR in mice.
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