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首页> 外文期刊>Brain research >Effect of upregulated renin-angiotensin system on per2 and bmal1 gene expression in brain structures involved in blood pressure control in TGR(mREN-2)27 rats.
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Effect of upregulated renin-angiotensin system on per2 and bmal1 gene expression in brain structures involved in blood pressure control in TGR(mREN-2)27 rats.

机译:肾素-血管紧张素系统上调对TGR(mREN-2)27大鼠血压控制相关脑结构中per2和bmal1基因表达的影响。

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Circadian system regulates rhythms with 24 h period including those occurring in the cardiovascular system. Inverted blood pressure profile was demonstrated in hypertensive TGR(mREN-2)27 (TGR) rats with upregulated renin-angiotensin system. To depict structures involved in the generation of the inverted pattern of blood pressure in TGR rats, we analyzed daily expression of clock genes per2 and bmal1 in the brain areas involved in the regulation of the blood pressure. Heterozygous male TGR and control rats were synchronized to the light:dark cycle 12:12 and blood samples were taken in 4 h intervals within 24 h cycle. The levels of the plasma renin activity were increased in TGR rats in comparison with controls. Brain nuclei were isolated by dissection from frozen sections. The clock gene expression was determined in the hypothalamic paraventricular and dorsomedial nuclei, dorsal vagal motor nucleus, caudal ventrolateral medulla, nucleus ambiguus, area postrema, and anteroventral third ventricle. Daily pattern of per2 expression was rhythmic in most of the nuclei studied with its highest levels at the beginning of the nighttime in both groups of rats. Expression of bmal1 peaked at the beginning of the day. We found robust differences in the clock gene expression between the TGR and control rats in the area postrema. TGR rats exerted changes in the clock gene expression in the nucleus ambiguus which receives direct innervation from the area postrema. The area postrema seems to play a key role in the transmission of signals from the periphery to the CNS.
机译:昼夜节律系统会在24小时内调节节律,包括发生在心血管系统中的节律。在肾素-血管紧张素系统上调的高血压TGR(mREN-2)27(TGR)大鼠中证实了血压的倒置。为了描述参与TGR大鼠血压倒置模式生成的结构,我们分析了参与调节血压的大脑区域中时钟基因per2和bmal1的日常表达。将杂合的雄性TGR和对照大鼠同步于明暗循环12:12,并在24小时周期内以4小时间隔采集血样。与对照组相比,TGR大鼠的血浆肾素活性水平增加。通过解剖从冷冻切片中分离出脑核。时钟基因的表达在下丘脑室旁和背侧核,背迷走运动核,尾腹侧延髓,歧核,后区域和前室第三脑中确定。在大多数研究过的细胞核中,per2的每日表达规律是有节奏的,两组大鼠在夜间开始时的最高水平。 bmal1的表达在一天开始时达到峰值。我们发现在视网膜后区域中TGR和对照大鼠之间的时钟基因表达存在明显差异。 TGR大鼠在歧义核中表达了时钟基因表达的变化,该歧义接收了来自视网膜后区域的直接神经支配。区域后区域似乎在从外围设备到CNS的信号传输中起着关键作用。

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