Effects of A-CREB, a dominant negative inhibitor of CREB, on the expression of c-fos and other immediate early genes in the rat SON during hyperosmotic stimulation in vivo.

Effects of A-CREB, a dominant negative inhibitor of CREB, on the expression of c-fos and other immediate early genes in the rat SON during hyperosmotic stimulation in vivo.
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A-CREB是CREB的主要负抑制剂A-CREB对体内高渗刺激期间大鼠SON中C-FOS和其他直接早期基因的表达的影响。

DOI:
10.1016/j.brainres.2011.10.033
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发表时间:
2012-01-06
期刊:
影响因子:
2.9
通讯作者:
Gainer H
Gainer H
中科院分区:
医学3区
文献类型:
--
作者:
Lubelski D;Ponzio TA;Gainer H

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腹腔内向大鼠视上核(SON)施用高渗盐水可增加几种即早期基因(IEG)和加压素基因的表达。这些增加通常归因于环AMP反应元件结合蛋白(CREB)的作用。在本文中,我们通过使用腺相关病毒(AAV)载体将有效的显性失活形式的CREB(称为A-CREB)传递给大鼠SON,研究CREB在体内这些事件中的作用。 HEK 293细胞体外初步实验表明,我们使用的A-CREB载体完全消除了CREB诱导的c-fos表达。我们将这种 AAV-A-CREB ​​立体定位注射到一只 SON 中,并将对照 AAV 注射到同一只大鼠的对侧 SON 中。注射两周后,我们向大鼠腹膜内注射高渗盐水。使用这种范例,我们可以测量在同一大鼠中,在 A-CREB ​​AAV 注射的 SON 与对照 AAV 注射的 SON 中,抑制 CREB ​​对 c-fos、ngfi-a、ngfi-b 和加压素基因的诱导表达的相对影响。我们发现,在 A-CREB ​​存在的情况下,c-fos 表达仅小幅下降 (20%),ngfi-b 表达仅下降 30%。其他 IEG 和 A-CREB ​​产生的加压素中的表达均未发现显着变化。这表明CREB可能在体内渗透激活的SON中IEG和加压素的表达中仅发挥次要作用。
Intraperitoneal administration of hypertonic saline to the rat supraoptic nucleus (SON) increases the expression of several immediate early genes (IEG) and the vasopressin gene. These increases have usually been attributed to action of the cyclic-AMP Response Element Binding Protein (CREB). In this paper, we study the role of CREB in these events in vivo by delivering a potent dominant-negative form of CREB, known as A-CREB, to the rat SON through the use of an adeno-associated viral (AAV) vector. Preliminary experiments on HEK 293 cells in vitro showed that the A-CREB vector that we used completely eliminated CREB-induced c-fos expression. We stereotaxically injected this AAV-A-CREB into one SON and a control AAV into the contralateral SON of the same rat. Two weeks following these injections we injected hypertonic saline intraperitoneally into the rat. Using this paradigm, we could measure the relative effects of inhibiting CREB on the induced expression of c-fos, ngfi-a, ngfi-b, and vasopressin genes in the A-CREB AAV injected SON versus the control AAV injected SON in the same rat. We found only a small (20%) decrease of c-fos expression and a 30% decrease of ngfi-b expression in the presence of the A-CREB. There were no significant changes in expression found in the other IEGs nor in vasopressin that were produced by the A-CREB. This suggests that CREB may play only a minor role in the expression of IEGs and vasopressin in the osmotically activated SON in vivo.
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