睡眠剥夺快速抗抑郁机制中腺苷及其受体对CREB的影响
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摘要
背景和目的:睡眠剥夺能够发挥快速抗抑郁效应,但其神经生物学机制至今尚不明确。睡眠剥夺过程中可观察到胞外腺苷水平明显升高及其受体发生一系列的变化,这提示腺苷系统在抑郁症病理生理、睡眠剥夺快速抗抑郁效应的机制、疗效等方面有一定作用。另一方面,CREB(环磷酸腺苷反应元件结合蛋白)是抑郁症相关信号通路中的一个交汇点。因此,本研究通过对慢性应激抑郁模型大鼠进行72小时快眼动睡眠剥夺并结合应用腺苷受体拮抗剂,观察海马和前皮质脑区CREB表达及磷酸化水平的变化,探讨腺苷在睡眠剥夺快速抗抑郁机制中可能的作用方式。
     材料和方法:实验动物为成年雄性Sprague Dawley大鼠,随机分为正常对照组(n=9,以下称A组)、应激造模组(n=54)。应激造模组采用21天慢性轻度不可预见性应激(chronic mild unpredicted stress,CMUS)和分养两种经典模型结合的方式来建立抑郁模型,采用随机区组法把造模成功大鼠分为6组:抑郁模型组(B组)、睡眠剥夺组(C组)、水环境对照组(D组)、生理盐水对照组(E组)、腺苷A1受体拮抗剂组(F组)和腺苷A2a受体拮抗剂组(G组)、。利用小平台水环境法对抑郁模型大鼠进行快眼动睡眠剥夺,并用大平台水环境做对照,排除水环境的影响。采用自发活动测试和蔗糖水消耗实验观察大鼠抑郁行为的变化,Western-blot方法检测各组大鼠海马、前皮质CREB总蛋白及磷酸化水平的变化。
     结果:
     1.开场实验:大鼠经过21天CMUS后自发活动较正常对照组显著减少(P<0.01);C组大鼠经过72hREMSD后,自发活动与水环境对照组相比显著增加(P<0.01);F组大鼠经过72hREMSD后,自发活动无明显变化(P>0.05),与E组相比有显著差异(P<0.01);G组大鼠经过72hREMSD后,自发活动明显增加(P<0.01),而且与E组相比无统计学差异(P>0.05)。
     2.蔗糖水消耗试验:大鼠经过21天CMUS处理后蔗糖水消耗量和蔗糖水消耗百分比均比正常对照组显著减少(P<0.01)。
     3. CREB总蛋白(tCREB)及磷酸化水平(pCREB和pCREB/tCREB)的变化:
     1)各处理方式对抑郁模型大鼠前皮质tCREB没有影响(P>0.05)。经过21天CMUS,大鼠前皮质磷酸化水平较正常对照组显著减少(P<0.01);72hREMSD使C、E组大鼠前皮质pCREB水平升高(P<0.01);F、G组大鼠前皮质pCREB水平明显低于与E组(P<0.01)。
     2)各处理方式对抑郁模型大鼠海马tCREB没有影响(P>0.05)。经过21天CMUS,大鼠海马pCREB与正常对照组相比显著减少(P<0.01);72hREMSD使C、E组大鼠海马pCREB水平显著提高(P<0.05);F组大鼠前皮质pCREB水平显著低于生理盐水对照组(P<0.05);而G组在72hREMSD后大鼠海马pCREB明显高于B组(P<0.05),与E组相比差异没有统计学意义。
     结论:
     1. 21天CMUS可导致大鼠自发活动明显减少,72 h REMSD可快速逆转这种改变;在72 h REMSD过程中对大鼠注射腺苷A1受体拮抗剂可阻断REMSD在行为学上的效应,而在72 h REMSD过程中注射腺苷A2A受体拮抗剂,大鼠的自发活动仍可增加;
     2. 21天CMUS降低大鼠海马和前皮质pCREB水平,可能是慢性应激导致大鼠抑郁样行为的机制之一;
     3. 72hREMSD升高抑郁模型大鼠海马和前皮质pCREB水平,可能是REMSD抗抑郁效应的机制之一。
     4.腺苷A1受体被拮抗时可阻断REMSD升高抑郁模型大鼠海马和前皮质pCREB水平的效应;腺苷A2A受体被拮抗时,REMSD仍可引起海马pCREB水平的升高,提示腺苷A1受体可能通过调节细胞内CREB相关信号通路参与REMSD的抗抑郁作用。
Backgrounds and objective:Sleep deprivation has a rapid antidepressant effect, but its neurobiological mechanisms is not clear so far. Now it is observed the levels of extracellular adenosine significantly increase and a series of changes of its receptors in the process of sleep deprivation,suggesting that the adenosine system play an important role in the pathophysiology of depression, rapid antidepressant effects of sleep deprivation.On the other hand, One protein that could serve as a convergence point for depression related multiple signaling pathways is the transcription factor CREB.Therefore,we studied the effects of 72 hour rapid-eye-movement sleep deprivation (REMSD) and adenosine A1 and A2A receptor antagonists on the CREB protein and phosphorylation level in hippocampus and prefrontal cortex of chronic mild unpredictable stress (CMUS) animal model to investigate the mechanisms of this antidepressant effects of sleep deprivation and the possible involvement of adenosine receptor.
     Materials and methods:Adult male Sprague Dawley rats were divided into seven groups randomly:1) normal control group(group A);2)the depression-model group(group B);3) 72 hours sleep deprivation group(group C);4)72 hours tank control group(group D);5)adenosine A1 receptor antagonists group(group E);6)adenosine A2A receptor antagonists group(group F);7) saline group(group G). Two classical models were adopted to build depression-model, one is chronic mild unpredicted stresses, and the other is sub-raising. The REMSD group used a small platform water environment, in order to remove the influence of the water environment, a big platform was used as a control condition. Using spontaneous movements test and sucrose consumption test to observe the change of behavior in rats.Using Western-blot analysis to detect CREB and phosphorylation levels in hippocampus and frontal cortex.
     Results:
     1.Spontaneous movements;
     Spontaneous movements decreased in the CMUS treated depressive animal model compare to the normal control rats. Spontaneous movements increased after 72h REMSD and treated with saline,adenosine A2A receptor antagonist.
     2.sucrose consumption test;
     The sucrose intake and the sucrose consumption percentage in the CMUS group were lower than those in the control group. The difference between the control and CMUS groups was significant.
     3.CREB(tCREB) and phosphorylation levels(pCREB and pCREB/tCREB);
     1)In frontal cortex,there were not significant diffrences of the levels of tCREB among the groups.The level of pCREB in group B was significantly lower than that in group A.Group C's pCREB level was significantly higher than that in group B.The level of pCREB in group E and F were no significant differences with group B,while the group G was significantly higher than group B.
     2)In hippocampus,there were not significant differences of the levels of tCREB among the groups.The level of pCREB in group B was significantly lower than that in group A.Group C's pCREB level was significantly higher than that in group B.The group F and G were significantly higher than group B.
     Conclusions:
     1.CMUS can lead to depressive behavior in rats,and 72 h REMSD can quickly reverse of this change.Combind used with adenosine A1 receptor antagonist in the 72h REMSD process could inhibit the antidepressant effects the REMSD on behavior,however,injecting adenosine A2A receptor antagonist during 72h REMSD, the depression behavior can be still meliorated.
     2.The level of pCREB in hippocampus and frontal cortex reduced after 21 days CMUS may be one of the mechanisms which lead to depression by chronic stress.
     3.The level of pCREB in hippocampus and frontal cortex increased after 72 hours REMSD may be one of the mechanisms which lead to the antidepressant effect by REMSD.
     4.In hippocampus,the effect that REMSD increased the level of pCREB may be inhibited when adenosine A1 receptor was antagonisted,but REMSD still increased pCREB level without A2A receptor activated.This indicated Adenosine A1 receptor involved in REMSD antidepressant effect through the regulation of intracellular CREB relevanted signaling pathways.
引文
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