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1.
本期导读     
本期刊登科研论文13篇。“睡眠剥夺及睡眠恢复后大鼠中缝核群星形胶质细胞的反应及其与神经元的关系”文中,发现睡眠剥夺影响中缝核星形胶质细胞GFAP的表达及神经元Fos的表达,提示中缝核的星形胶质细胞和神经元可能共同参与睡眠调节。“大鼠骨髓基质细胞分泌胶质细胞源性神经营养因子的研究”文中,发现骨髓基质细胞具有分泌胶质细胞源性神经营养因子(GDNF)的能力,并受周围环境和自身生长状况的影响。“CGRP和NGF对脑局部缺血再灌注大鼠脑组织神经元凋亡及PKCmRNA表达的调节作用”文中,发现降钙素基因相关肽(CGRP)和神经生长因子(…  相似文献   

2.
目的探讨慢性睡眠剥夺对小鼠海马组织α7-nAChR表达及星形胶质细胞和小胶质细胞表面α7-n AChR的表达的影响。方法成年C57BL/6J小鼠随机分为3组:正常对照(control,CC)组、慢性睡眠剥夺(sleep deprivation,SD)组、慢性睡眠剥夺后腹腔注射α7-nAChR激动剂PHA-543613(SD+PHA-543613)组。采用Western印迹、实时荧光定量PCR分别检测各组小鼠海马组织α7-nAChR蛋白及基因的表达;使用免疫荧光染色法观察各组小鼠海马组织星形胶质细胞、小胶质细胞表面α7-nAChR的表达变化。结果 SD组与CC组比较,SD组海马组织的α7-nAChR蛋白表达、mRNA表达和星形胶质细胞表面α7-nAChR的表达均明显低于CC组(P=0.001,P=0.038,P=0.003);SD组与SD+PHA-543613组比较,SD+PHA-543613组海马组织的α7-nAChR蛋白表达、mRNA表达和星形胶质细胞表面α7-nAChR的表达较SD组升高(P=0.037,P=0.002,P=0.027)。结论慢性睡眠剥夺不仅抑制海马组织α7-nAChR基因及蛋白的表达,同时降低α7-nAChR在星形胶质细胞表面的表达,海马组织胶质细胞α7-nAChR的减少可能是慢性睡眠剥夺后认知功能下降的危险因素。  相似文献   

3.
目的 研究快速眼动睡眠剥夺后大鼠空间记忆功能和海马细胞型朊蛋白(cellular prion protein,PrPC)表达的变化及沉默细胞型朊蛋白对体外培养的海马神经元轴突延伸的影响,探讨睡眠剥夺后认知功能变化的机制.方法 成年SD大鼠按体重大小排序,完全随机法分为3组,分别为正常笼养对照组、水槽对照组、睡眠剥夺组.采用改良多平台睡眠剥夺法进行连续72 h快速眼动睡眠剥夺.采用Moms水迷宫评估空间记忆.用蛋白质印迹法检测睡眠剥夺后各组大鼠海马PrPC表达的变化.使用原代培养的海马神经元,用RNA干扰技术沉默PrPC,观察神经元轴突延伸的变化.结果 大鼠睡眠剥夺后空间记忆受损,睡眠剥夺组穿越平台次数(3.17±0.95)较笼养对照组(7.17±0.95)和水槽对照组(6.50 ±0.62)明显减少(Z =2.026 6,Z=2.026 6,P<0.05),平台接近平均值(mm)睡眠剥夺组(711.74 ±33.99)较笼养对照组(592.32±31.31)和水槽对照组(580.86±11.36)明显增大(Z=-2.001 6,Z=-2.482 0,P<0.05).睡眠剥夺后海马PrPC的表达睡眠剥夺组(0.33±0.10)较笼养对照组(1.01±0.33)和水槽对照组(0.96±0.27)明显下调(Z =2.152 9,Z=2.152 9,P<0.05).沉默PrPC导致原代培养的海马神经元轴突延伸障碍,感染组神经元(326.28±12.53)与未感染组(555.00±30.43)和感染阴性对照组(558.70±23.10)比较,轴突长度(μm)明显变短(Z =4.768 4,Z=4.877 0,P<0.05).结论 睡眠剥夺后PrPC介导的海马新生神经元轴突延伸障碍可能是睡眠剥夺后认知障碍发生的潜在机制之一.  相似文献   

4.
目的探讨星形胶质细胞连接蛋白43(Cx43)及其半通道在缺血再灌注(IR)损伤中的作用。方法 32只Wistar鼠被随机分为IR 0 h组、IR 4 h组和IR 24 h组和对照组,每组8只鼠。用免疫组化和Western印迹法检测各组大鼠星形胶质细胞Cx43、半通道抗体1(HC1)和半胱天冬酶3(Casp3)的表达。在氧葡萄糖剥夺-再恢复(OGDR)0 h,4 h和24 h,用MTT法检测星形胶质细胞活性,用免疫组化和Western印迹法检测Cx43,HC1和Casp3表达的改变。结果大鼠星形胶质细胞中HC1的表达明显少于Cx43的表达。与对照组比较,IR 4 h组大鼠脑组织中Cx43、HC1和Casp3的表达明显增加(均P0.05),而IR 0 h组和IR 24 h组却没有明显的变化。OGDR后星形胶质细胞cell line和Psup细胞中Cx43、HC1和Casp3的表达在OGDR 4h组明显高于对照组(均P0.05),在OGDR 24 h组则与对照组差异无统计学意义。OGDR后shRNA星形胶质细胞中Cx43、HC1和Casp3的表达无统计学意义上变化。结论 Cx43及HCl在星形胶质细胞凋亡过程中起到了促进作用,这可能是IR损伤发生及发展的机制之一。  相似文献   

5.
目的探讨重组人促红细胞生成素(recombinanthuman erythropoietin,rhEPO)预处理对氧糖剥夺并复氧培养后星形胶质细胞水肿及其水通道蛋白4(aquaporin4,AQP4)表达的影响。方法星形胶质细胞分成:正常组、模型组和rhEPO预处理组。星形胶质细胞在5 h时长的氧糖剥夺后复氧培养至0.5 h、2 h、8 h、24 h四个时间点时,用光镜观察细胞形态变化,用乳酸脱氢酶(LDH)漏出率测定反应细胞的损伤程度,用RT-PCR法及Western blot法测定AQP4的表达变化。结果光镜观察到rhEPO预处理能明显减轻氧糖剥夺后星形胶质细胞水肿的程度。氧糖剥夺后24 h时,LDH漏出率有明显增高(F=80.45,P0.01),rhEPO预处理能明显降低(P0.01)氧糖剥夺后LDH漏出率增高(P0.01)的程度。AQP4的mRNA和蛋白在氧糖剥夺后的表达,各组间有明显差异(8 h时:mRNA:F=49.26,P0.01,蛋白:F=43.13,P0.01);与正常组相比,模型组AQP4在氧糖剥夺后短暂下降后呈上升趋势,至8 h时达峰值(均P0.01),至24 h时未恢复正常水平;与模型组相比,rhEPO预处理组AQP4 mRNA和蛋白在氧糖剥夺后的表达变化趋势与模型组相似,但在各个时间点时的表达均明显降低(8 h时:mRNA:P0.01,蛋白:P0.01)。结论rhEPO预处理能明显减轻5 h氧糖剥夺后的星形胶质细胞水肿,机制可能是其通过降低氧糖剥夺后AQP4的表达水平而实现。  相似文献   

6.
睡眠剥夺对大鼠海马和皮质IL-1βmRNA表达的影响   总被引:1,自引:0,他引:1  
目的:研究完全睡眠剥夺对大鼠海马和皮质IL-1βmRNA表达的影响。方法:将大鼠放入1转/分钟转笼中,制作经历不同持续时间的完全睡眠剥夺(TSD)模型。30只大鼠随机分为5小组:对照组(正常对照CC组,环境对照 TC组)和睡眠剥夺组[TSD6h组,TSD1d组,TSD3d组(n=6只)]。采用RT-PCR方法检测大鼠海马和皮质IL- 1βmRNA表达。结果:大鼠海马区,TSD6h组和TSD1d组IL-1βmRNA的表达明显高于对照组,TSD3d组更为明显;皮质区TSD3d组表达也明显增多。结论:完全睡眠剥夺大鼠海马和皮质IL-1βmRNA表达增高,且随时间的延长而逐趋明显。睡眠短期剥夺IL-1βmRNA表达增高可能对脑细胞具有应激性保护作用,而长期剥夺后IL-1β持续增高可能对神经元有损伤作用。  相似文献   

7.
目的探讨体外培养星形胶质细胞缺氧及复氧后水通道蛋白-9(AQP9)表达的变化特点及其所起的作用。方法取生后2d的Wistar大鼠大脑皮层进行星形胶质细胞纯培养,缺氧时间分别为:12、24、48h,并取缺氧24h后复氧12、24、48h的细胞进行存活率、乳酸脱氢酶活性的测定,采用免疫细胞化学方法检测细胞AQP9的表达。结果缺氧组及复氧组的星形胶质细胞死亡数与对照组相比无明显变化,缺氧和复氧后乳酸脱氢酶活性亦无明显改变(P(0.05),缺氧组细胞AQP9表达较对照组增高,并随缺氧时间延长而明显增高(P<0.05),复氧后24h内AQP9表达逐渐下降,24h后AQP9表达仍未恢复正常水平。结论星形胶质细胞对缺氧较为耐受,缺氧对星形胶质细胞存活能力无明显影响,缺氧引起AQP9的表达上调,而复氧使其表达明显下降。  相似文献   

8.
目的 研究异相睡眠(REM 睡眠)剥夺对大鼠海马及额叶内质网应激相关蛋白转录活化因子4(ATF4)表达的影响.方法 大鼠采用完全随机数字表法分为6组:空白对照组(CC组)、环境对照组(TC)、睡眠剥夺(SD)6h、12 h、1 d、3 d组,每组10只.采用改良多平台睡眠剥夺法建立REM 睡眠剥夺大鼠模型,免疫组织化学及Westemblot方法测定不同时间点大鼠额叶及海马ATF4蛋白的表达.结果 CC组大鼠海鸟及额叶均未检测出ATF4.TC组海马、额叶均有ATF4表达,SD组海马、额叶6 h时开始表达ATF4,12 h后达到高峰,1 d、3 d呈逐渐下降趋势.结论 REM睡眠剥夺可诱发内质网应激,睡眠剥夺后大鼠海马与额叶发生内质网应激的时间及发展趋势基本相同.  相似文献   

9.
目的 观察水通道蛋白4(AQP4)抗体对体外培养的大鼠皮层神经细胞的毒性作用,探讨其在视神经脊髓炎发病机制中的作用.方法 选取孕16~19 d Wistar大鼠胚胎皮层神经细胞培养3d,采用随机数字表法分为2组:对照组、AQP4抗体阳性患者血清组(抗体组).对照组以10%的比例加入正常人血清,抗体组加入等量AQP4抗体阳性患者血清培养.2h、4h、6h后使用免疫组织化学荧光染色观察星形胶质细胞、神经元和小胶质细胞形态及数量的变化.结果 对照组不同时间点3种神经细胞形态和数目无任何变化:抗体组2h后就出现星形胶质细胞肿胀、小胶质细胞体积增大以及神经元轴突断裂等形态学的改变,但3种细胞数量无明显变化:4h后星形胶质细胞和神经元比例分别为(24.73+5.27)%和(35.49+8.43)%,明显少于对照组[(30.34±4.53)%和(48.60±1 0.99)%],差异有统计学意义(p<0.05);小胶质细胞比例较对照组明显增多[分别为(27.35±13.17)%和(16.44±2.70)%],差异有统计学意义(P<0.05);6 h后3种细胞数量变化更为明显(P<0.05).结论 AQP4抗体能导致体外培养的大鼠皮层星形胶质细胞和神经元死亡以及小胶质细胞的活化,推测其在视神经脊髓炎的发病机制中发挥一定作用.  相似文献   

10.
快速眼动睡眠剥夺后大鼠皮质及海马 HSP70表达的研究   总被引:5,自引:0,他引:5  
目的探讨不同时间的快速眼动(REM)睡眠剥夺对大鼠皮质及海马各区的热休克蛋白70(HSP70)表达的影响及意义。方法60只Wistar大鼠,随机分为睡眠剥夺组(SD)、环境对照组(TC)和空白对照组(CC)。其中SD组又分为1d、3d、5d、7d4个时点。用改良多平台睡眠剥夺法进行REM睡眠剥夺,运用免疫组织化学方法观察REM睡眠剥夺后大鼠额叶、顶叶皮质及海马各区HSP70表达的分布规律及时空变化;同时结合蛋白质免疫印记(Western Blot)实验对额叶皮质及全海马HSP70蛋白作了选择性的半定量分析。结果REM睡眠剥夺后1d脑内HSP70表达一过性增强。以后逐渐下降。Western Blot实验印证了这一结果。结论REM睡眠剥夺能够引起大鼠皮质及海马神经元内HSP70表达增强,可能是一种自身稳定调节的保护机制。  相似文献   

11.
GFAP和Fos蛋白在戊四氮致痫大鼠前脑中的表达变化   总被引:2,自引:0,他引:2  
目的 研究大鼠在戊四氮导致癫痫发作时前脑内星形胶质细胞和神经元的形态学反应及其相互关系。方法 应用免疫组织化学单标记法分别显示前脑内GFAP和Fos蛋白表达的时间规律,并用免疫组织化学双重标记显示GFAP和Fos蛋白表达的相互关系。结果 在戊四氮导致大鼠癫痫发作早期,前脑的星形胶质细胞被激活,细胞体积增大,突起粗大,GFAP表达阳性,随着存活时间的变化,星形胶质细胞的反应经历先逐渐升高后降低的过程。被激活的星形胶质细胞和神经元表达Fos蛋白阳性,也呈现逐渐升高又降低的变化;另外,GFAP阳性星形胶质细胞和Fos阳性神经元在前脑主要分布在大脑皮层、海马、杏仁核等部位,二者的分布特征基本一致。结论 星形胶质细胞可能和神经元一起参与了戊四氮所致癫痫发作的变化。  相似文献   

12.
LPS激发大鼠前脑神经元Fos和小胶质细胞OX42表达改变   总被引:1,自引:0,他引:1  
目的 探讨单次腹腔注射LPS后前脑神经元和小胶质细胞的可塑性变化和相互关系。方法 应用抗Fos、抗TH或抗OX42单一、以及抗Fos/抗TH/抗OX42三重免疫组化标记方法,观察大鼠单次腹腔注射LPS后,Fos阳性神经元、Fos/TH阳性神经元、OX42阳性小胶质细胞在脑内的表达分布及时程变化,以及Fos阳性神经元或Fos/TH阳性神经元与OX42阳性小胶质细胞之间的关系。结果:Fos阳性神经元分布在额、顶皮质,扣带回和梨状皮质,外侧隔核腹侧部,杏仁中央核,海马CA2区、CA3区、齿状回,下丘脑室旁核、视上核、下丘脑外侧区和第三脑室周围灰质等。Fos阳性神经元在注射后30min出现表达,注射后1~3h为表达高峰。反应阳性小胶质细胞首先于脑室周围灰质出现,注射后6h达到高峰,胞体变大,突起变粗,OX42呈阳性深染,密集分布于Fos阳性神经元的表达区域。下丘脑Fos/TH/OX42三重染色切片显示:由LPS激活的Fos/TH阳性神经元周围被OX42阳性细胞包绕并接触,表明神经元和小胶质细胞在对LPS刺激的反应中关系密切。结论 在外周免疫刺激下,下丘脑、扣带回、梨状皮质和海马内的神经元和小胶质细胞可能参与免疫调节。  相似文献   

13.
Gap junctional communication is mainly mediated by connexin36 and connexin43 in neurons and astrocytes, respectively. It has been suggested that connexin36 allows electrical coupling between neurons whereas connexin43 participates in several process including release of ATP. It was recently reported that blockage of gap junctional communication mediated by connexin36 can disrupt the sleep architecture of the rat. However, there is no experimental approach about effects of sleep deprivation on connexins expression. Therefore, we examined in adult male Wistar rats whether protein levels of connexin36 and connexin43 change in pons, hypothalamus, and frontal cortex after 24 h of total sleep deprivation and 4 h of sleep recovery. Western blot revealed that total sleep deprivation significantly decreases the levels of connexin36 in the hypothalamus and this decrease maintains after sleep recovery. Meanwhile, connexin43 is not altered by total sleep deprivation but interestingly the sleep recovery period induces an increase of this connexin. These results suggest that electrical coupling between hypothalamic neurons could be altered by sleep deprivation and that sleep recovery drives changes in connexin43 expression probably as a mechanism related to ATP release and energy regulation during sleep.  相似文献   

14.
Rats were sleep deprived by the platform method to look for differential effects on light and deep slow wave sleep depending on platform size. Diameters of large and small platforms were 15 cm and 5.1 cm respectively. Sleep was recorded during a baseline light period (09.00-19.00 h), continuously during 48 h of sleep deprivation and during the first lights on recovery period (09.00-19.00 h). In both platform conditions REM sleep was virtually abolished during the first light period (hours 0-10 of sleep deprivation), while NREM sleep was reduced to approximately half of control values. During the second light period (hours 22-34 of sleep deprivation) REM sleep recovered somewhat in the large platform group. Light slow wave sleep (SWS-1) was comparable to baseline while deep slow wave sleep (SWS-2) was still significantly reduced. In the small platform group both SWS-2 and REM sleep was considerably reduced on day 2. Over the whole deprivation period there was an effect of platform size on SWS-1 (higher in the small platform group), and on SWS-2 and REM sleep (lower in the small platform group). During the 9 h light-time recovery sleep there was an REM sleep rebound in both groups. SWS-1 was reduced in both groups while SWS-2 was not significantly increased. The ratio SWS-2/SWS-1 was, however, significantly increased only in the small platform group recovery sleep. The results suggest that platform sleep deprivation deprives the animals of deep slow wave sleep in addition to REM sleep. This has implications for conclusions on REM sleep function based upon REM sleep deprivation.  相似文献   

15.
It has been proposed that cholinergic neurons of the basal forebrain (BF) may play a role in vigilance state control. Since not all vigilance states have been studied, we evaluated cholinergic neuronal activation levels across spontaneously occurring states of vigilance, as well as during sleep deprivation and recovery sleep following sleep deprivation. Sleep deprivation was performed for 2 h at the beginning of the light (inactive) period, by means of gentle sensory stimulation. In the rodent BF, we used immunohistochemical detection of the c-Fos protein as a marker for activation, combined with labeling for choline acetyl-transferase (ChAT) as a marker for cholinergic neurons. We found c-Fos activation in BF cholinergic neurons was highest in the group undergoing sleep deprivation (12.9% of cholinergic neurons), while the spontaneous wakefulness group showed a significant increase (9.2%), compared to labeling in the spontaneous sleep group (1.8%) and a sleep deprivation recovery group (0.8%). A subpopulation of cholinergic neurons expressed c-Fos during spontaneous wakefulness, when possible confounds of the sleep deprivation procedure were minimized (e.g., stress and sensory stimulation). Double-labeling in the sleep deprivation treatment group was significantly elevated in select subnuclei of the BF (medial septum/vertical limb of the diagonal band, horizontal limb of the diagonal band, and the magnocellular preoptic nucleus), when compared to spontaneous wakefulness. These findings support and provide additional confirming data of previous reports that cholinergic neurons of BF play a role in vigilance state regulation by promoting wakefulness.  相似文献   

16.
《Brain research bulletin》2010,81(6):382-388
It has been proposed that cholinergic neurons of the basal forebrain (BF) may play a role in vigilance state control. Since not all vigilance states have been studied, we evaluated cholinergic neuronal activation levels across spontaneously occurring states of vigilance, as well as during sleep deprivation and recovery sleep following sleep deprivation. Sleep deprivation was performed for 2 h at the beginning of the light (inactive) period, by means of gentle sensory stimulation. In the rodent BF, we used immunohistochemical detection of the c-Fos protein as a marker for activation, combined with labeling for choline acetyl-transferase (ChAT) as a marker for cholinergic neurons. We found c-Fos activation in BF cholinergic neurons was highest in the group undergoing sleep deprivation (12.9% of cholinergic neurons), while the spontaneous wakefulness group showed a significant increase (9.2%), compared to labeling in the spontaneous sleep group (1.8%) and a sleep deprivation recovery group (0.8%). A subpopulation of cholinergic neurons expressed c-Fos during spontaneous wakefulness, when possible confounds of the sleep deprivation procedure were minimized (e.g., stress and sensory stimulation). Double-labeling in the sleep deprivation treatment group was significantly elevated in select subnuclei of the BF (medial septum/vertical limb of the diagonal band, horizontal limb of the diagonal band, and the magnocellular preoptic nucleus), when compared to spontaneous wakefulness. These findings support and provide additional confirming data of previous reports that cholinergic neurons of BF play a role in vigilance state regulation by promoting wakefulness.  相似文献   

17.
Rapid eye movement (REM) sleep is hypothesized to result from the activity of REM sleep-generating and REM sleep-inhibiting neurons. The serotoninergic (5-HT) neurons of the dorsal raphe nucleus (DRN) represents one such population of REM-sleep inhibiting neurons since they are silent during REM sleep. Consistent with the decrease in activity of 5-HT neurons, the brain extracellular levels of 5-HT are lower during REM sleep compared to wakefulness. It is not known whether serotonin release is also reduced as a consequence of REM sleep rebound. Using microdialysis sampling coupled to HPLC–ECD, we measured the extracellular levels of 5-HT and its metabolite (5-HIAA) in the medial medullary reticular formation (mMRF) of freely behaving rats during normal sleep, REM sleep deprivation as well as during REM sleep rebound. We found that the levels 5-HT and 5-HIAA were significantly decreased by REM sleep deprivation. The reduction of 5-HT release was maintained during REM sleep rebound but the extracellular level of its main metabolite was increased. In addition, even during REM sleep rebound, 5-HT release during sleep was low compared to wakefulness. Taken together these data support the permissive role of 5-HT neurotransmission for REM sleep expression.  相似文献   

18.
Recent evidence suggests that synaptic plasticity occurs during homeostatic processes, including sleep–wakefulness regulation, although the underlying mechanisms are not well understood. Polysialylated neural cell adhesion molecule (PSA NCAM) is a transmembrane protein that has been implicated in various forms of plasticity. To investigate whether PSA NCAM is involved in the neuronal plasticity associated with spontaneous sleep–wakefulness regulation and sleep homeostasis, four studies were conducted using rats. First, we showed that PSA NCAM immunoreactivity is present in close proximity to key neurons in several nuclei of the sleep–wakefulness system, including the tuberomammillary hypothalamic nucleus, dorsal raphe nucleus, and locus coeruleus. Second, using western blot analysis and densitometric image analysis of immunoreactivity, we found that 6 h of sleep deprivation changed neither the levels nor the general location of PSA NCAM in the sleep–wakefulness system. Finally, we injected endoneuraminidase (Endo N) intracerebroventricularly to examine the effects of polysialic acid removal on sleep–wakefulness states and electroencephalogram (EEG) slow waves at both baseline and during recovery from 6 h of sleep deprivation. Endo N‐treated rats showed a small but significant decrease in baseline rapid eye movement (REM) sleep selectively in the late light phase, and a facilitated REM sleep rebound after sleep deprivation, as compared with saline‐injected controls. Non‐REM sleep and wakefulness were unaffected by Endo N. These results suggest that PSA NCAM is not particularly involved in the regulation of wakefulness or non‐REM sleep, but plays a role in the diurnal pattern of REM sleep as well as in some aspects of REM sleep homeostasis.  相似文献   

19.
Sleep of 8 narcoleptic and 8 control subjects was recorded under baseline (i.e., prior wakefulness 16 h) and after 24 h without sleep. During both baseline and recovery total sleep time and stage 2 non-REM sleep were significantly decreased in narcoleptic subjects. Slow wave activity (i.e., EEG power density in the range of 0.75-4.5 Hz) decayed exponentially during baseline and after sleep deprivation in both narcoleptic and control subjects. During both baseline and recovery EEG power density in delta and sigma frequencies in non-REM sleep was enhanced in narcoleptic subjects relative to controls. In REM sleep differences in the same direction were present in delta and beta frequencies. After sleep deprivation EEG power density in non-REM sleep was elevated in delta and some higher frequencies in both patients and controls, but the response to sleep deprivation was stronger in narcoleptic subjects. These data show that in narcoleptic subjects regulatory processes underlying non-REM sleep homeostasis are operative and indicate that the response to sleep deprivation is stronger than in control subjects.  相似文献   

20.
We studied the effects of water deprivation on the expression of c-fos protein (Fos) in the brain of inbred polydipsic mice, STR/N strain, that show extreme polydipsia without a lack of vasopressin in the body. Non-polydipsic mice, ICR strain, were used as controls. All male animals were deprived of water for 24 and 48 h. Fos-like immunoreactivity (Fos-LI) in the brain was studied by immunohistochemical techniques. In both groups of mice water deprivation induced a remarkable increase in Fos-LI in the hypothalamic paraventricular (PVN) and supraoptic (SON) nuclei, the median preoptic nucleus (MnPO), the organum vasculosum laminae terminalis (OVLT) and the subfornical organ (SFO). A far more increase, however, was seen in the MnPO, the SFO and the area postrema (AP) of the polydipsic mice compared to those of the non-polydipsic control mice. In the nucleus of the tractus solitarius (NTS) and in the anteroventral part of the PVN (avPVN), water deprivation caused a clear increase in Fos-LI in the polydipsic mice, while in the non-polydipsic mice the same treatment induced no Fos-LI in the NTS and no change in the avPVN. These results indicate that neurons in the circumventricular organs and the NTS are strongly activated by water deprivation in the polydipsic mice, suggesting that these brain structures play an important role in the polydipsia.  相似文献   

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