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find Keyword "电压" 11 results
  • Effects of Dichloroacetate on the Kv1. 5 of Pulmonary Arterial Smooth Muscle Cells in Simulated High Altitude Pulmonary Hypertension Rats

    Objective To investigate the role of Kv1. 5 in the pathogenesis of pulmonary hypertension simulated by hypobaria and hypoxia, and the effects of dichloroacetate ( DCA) on the Kv1. 5 expression in pulmonary arterial smooth muscle cells ( PASMCs ) and mean pulmonary arterial pressure ( mPAP) . Methods Twenty-four SD rats were randomly divided into a normal group ( N group) , a high altitude group ( HA group) , and a DCA treated group ( DCA group) . The N group were fed in normalconditions, the HA group and DCA group were fed in a hypobaria and hypoxia chamber simulated to an altitude of 5000 meters. In addition, the DCA group rats were gastric gavaged with DCA ( 70 mg · kg - 1 · d - 1 ) .Twenty-one days later, percentage of wall thickness ( WT% ) and percentage of wall area ( WA% ) of the pulmonary arteriole, mPAP, and the ratio of right ventricle / left ventricle and septum ( RV/ LV + S) were evaluated. Real-time PCR, immunohistochemistry and Western blot were carried out to detect the Kv1. 5 expression in PASMCs. Results In the HA group, WT% , and WA% of pulmonary arteriole, mPAP and RV/ ( LV + S) all increased significantly compared with the N group ( P lt;0. 01) . These changes in the DCA group were significantly lower than those in the HA group( P lt; 0. 01) . Furthermore, the protein and mRNA expression of Kv1. 5 in the PASMCs deceased significantly in the HA group compared with the N group( P lt;0. 01) , but recovered in the DCA group ( P lt;0. 01) . Conclusions The expression of Kv1. 5 in PASMCs is tremendously inhibited in rats fed in high altitude, which might be a important role of pulmonaryhypertension. DCA can inhibit the remodeling of pulmonary arterials probably by recovering Kv1. 5 expression.

    Release date:2016-08-30 11:52 Export PDF Favorites Scan
  • 敲除与Th2 细胞活化相关的电压依赖钙通道可防止实验性哮喘发生(Knocking down Cav1 calcium channels implicated in Th2 cell activation prevents experimental asthma)

    敲除与Th2 细胞活化相关的电压依赖钙通道可防止实验性哮喘发生(Knocking down Cav1 calcium channels implicated in Th2 cell activation prevents experimental asthma) 【摘要翻译】 研究理由: Th2 型细胞参与过敏性哮喘,这些细胞产生的细胞因子( IL-4、IL-5 及IL-13) 在过敏状态时分泌增加。因此, 研究Th2 型细胞表达的对其功能具有重要影响的关键信号分子至关重要。我们既往的研究显示二氢吡¤特异性调控Th2 细胞的功能。目的: 由于二氢吡¤可特异性与活化细胞的电压依赖钙通道( Cav1) 结合并调节其功能, 我们的主要目的是证实Th2 细胞特异性表达功能性的Cav1 相关通道, 抑制其功能可能抑制哮喘。方法: 我们通过定量PCR 和Western blot 检测Th2 和Th1 细胞Cav1 通道表达。我们将Th2 细胞表达的Cav1 的异构体进行测序, 并研究Cav1 反义寡核苷酸( Cav1AS) 是否影响Ca2 + 信号及细胞因子的产生。最后, 我们通过给OVA 鼻腔激发的BALB/c小鼠注射Cav1AS 转染的OVA 特异性Th2 细胞研究Cav1AS在被动免疫哮喘动物模型中的作用, 并通过鼻腔给予此前进行过OVA 及氢氧化铝免疫的BABL/ c 小鼠Cav1AS 和OVA溶液以研究Cav1AS 对主动免疫哮喘模型的影响。检测和主要结果: 我们发现小鼠Th2 细胞而非Th1 细胞表达Cav1. 2和Cav1. 3 通道。转染Cav1AS 抑制了钙通路和细胞因子产生, 并导致Th2 细胞丧失过继Th2 细胞诱导气道炎症功能。鼻腔内给予Cav1AS 可抑制主动免疫导致的哮喘气道炎症和气道高反应性。结论: 这些结果提示Th2 细胞特异性表达Cav1. 2 and Cav1. 3 通道, 以此作为治疗靶点可有效抑制动物模型的哮喘反应。 【述评】 哮喘是一种Th2 型慢性气道炎症反应疾病,目前机制未明。Th2 细胞在此过程中发挥关键作用, 但Th2细胞活化机制不清楚。本文的研究发现Th2 细胞特异性表达Cav1. 2 和Cav1. 3 通道, 以Cav1AS抑制Cav1 通道的表达可抑制Th2 细胞功能进而抑制哮喘炎症反应。该研究揭示了哮喘气道炎症反应的新机制, 为哮喘治疗提供了新靶点。但是, Cav1 通道如何影响Th2 细胞的功能尚需进一步研究。其次, 有些基因在人类和小鼠表达并不一致, 特别是一些异构体的表达水平不同, 甚至在功能上存在很大差异, 因此, 在哮喘患者中Cav1 通道的表达尚待研究。最后, Th2 功能失调在一些自身免疫性疾病中发挥重要作用, 因此, 如证实Cav1 通道可用于人类哮喘治疗, 则该方法可能对其他一些自身免疫性疾病有治疗作用。

    Release date:2016-08-30 11:54 Export PDF Favorites Scan
  • Significance of ClC-3 Expression in Acute Cardiac Allograft Rejection in Rats

    Abstract:Objective To investigate the expression and significance of Voltage-gated Cl channel-3 (ClC-3) in acute cardiac allograft rejection in rats. Methods The model of heterotopic cardiac allograft of SD to Wistar rats was established. The rats were divided into two groups: control group and cyclosporin A(CsA) treated group (CsA group). Living span of the transplants in eight rats of each group were observed. Allograft samples were harvested separately on the day 1, 3, 5, 7 after operation (n = 6). The rejection was evaluated by routine pathological examinations. The myocardial apoptosis by terminal deoxylnucleotidyl transferase mediated-dUTP nick end labeling (TUNEL) method and the local expression of ClC-3 were detected by reverse transcriptase polymerase chain reaction (RT-PCR). Results The allografts survival time was significantly longer in CsA group compared with that in control group (15.4±5.1dvs. 7.6±1.5d, P〈0.05). There was lesser pathological changes in CsA group than that in control group. The apoptosis index were significantly higher in control group and the expression of ClC-3 was significantly lower(P〈0.05). CsA could inhibit the rise of apoptosis index and the decrease of the ClC-3 expression. Conclusion The ClC-3 expression is closely related with the severity of myocardial necrosis and apoptosis index, which indicates that ClC-3 plays a very important role in the necrosis and apoptosis during acute cardiac allograft rejection of rat.

    Release date:2016-08-30 06:23 Export PDF Favorites Scan
  • Voltage-dependent Calcium Channel Plays a Role in the Formation of Large-amplitude Miniature Excitatory Postsynaptic Current

    目的 观察电压依赖性钙通道是否作用于大鼠脊髓背角胶状质层(SG)神经元大振幅微小兴奋性突触后电流的形成。 方法 选用成年雄性Sprague-Dawley(SD)大鼠,2%~3%异氟烷麻醉后,分离其腰骶部的脊髓,然后切片。采用全细胞电压钳技术,玻璃微电极的电阻为4~6 MΩ,钳制电压为?70 mV,记录胶状质层神经元微小兴奋性突触后电流(mEPSC)电流。将电流信号用Axopatch 200来放大并储存于电脑。对照组和用药结束后,持续采样mEPSC电流30 s。mEPSC电流的频率和振幅用Clampfit 8.1进行分析。 结果 钳制电压为?70 mV时,所有SG神经元均有自发性的EPSC。辣椒素增加mEPSC发生的频率和波幅。钴离子抑制辣椒素诱导的大振幅mEPSC。钴离子抑制辣椒素诱导的mEPSC的平均振幅,而不抑制其发生频率。 结论 电压依赖性钙离子通道参与了辣椒素引起的痛觉形成。

    Release date:2016-09-08 09:16 Export PDF Favorites Scan
  • Feasibility Study of Gemstone CT Coronary Angiography with Low Tube Voltage and Low Concentration Contrast Medium

    ObjectiveTo assess the image quality and radiation dose of gemstone CT coronary angiography (CCTA) with low tube voltage and low concentration contrast medium. MethodsSixty-nine patients who underwent CCTA from January to March 2014 were randomly divided into group A and B. CCTA was performed in thirty-four patients in group A with tube voltage of 100 kV and concentration of contrast medium of 300 mgI/mL. And thirty-five patients in group B underwent CCTA with 120 kV and 370 mgI/mL. According to upgrading American Heart Association standard all segments and all vessels were evaluated. We measured the CT value of ascending aortic root, left main coronary artery, and the initial segment of left anterior descending branch, left circumflex, right coronary artery, and also adjacent tissues. Besides, we recorded CT dose volume index (CTDIvol) and the dose length product (DLP) and calculated effective radiation dose. ResultsThe image quality scores were not significantly different between two groups (P>0.05). The density in the contrast enhanced vessel lumens in group A were signifcantly higher than that in group B (P<0.05). There was no significant difference in signal to noise ratio and carrier to noise ratio between the two groups (P>0.05). Noise in group A was higher than that in group B (P<0.05). The CTDIvol and effective radiation dose in group A were significantly lower than those in group B (P<0.05). ConclusionThe combination of 100 kV with low concentration contrast medium (300 mgI/mL) still maintains the image quality, as well as significantly lowers the radiation dose and the dose of iodine.

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  • 儿童癫痫中的神经元抗体:临床特征和未经免疫治疗的历史队列远期预后

    神经元细胞表面抗体在自身免疫性脑炎的发病中起着明确的作用;早期诊断和治疗的患者预后更好。在不伴脑炎的儿童癫痫中也见神经元抗体阳性的报道。文章旨在评估神经元抗体对儿童癫痫患者远期预后是否有影响。该前瞻性研究患者来自荷兰儿童癫痫研究(Dutch Study of Epilepsy, DSEC)的4个中心,于1988年-1992年期间招募患者(n=178),均未接受免疫治疗。以健康且年龄匹配的骨髓捐赠者作为正常对照(n=112)。所有受试者均使用标准方法,检测血清N-甲基-D-天冬氨酸受体(N-methyl-D-aspartate, NMDAR)、α氨基-3-羟基-5-甲基-4-异恶唑丙酸受体、富含亮氨酸胶质瘤失活1蛋白,接触蛋白相关蛋白2(Contactin associated protein like 2, CASPR2)、contactin-2、谷氨酸脱羧酶和电压门控钾通道(Voltage gated potassium channel, VGKC)-复合物抗体。均未使用脑脊液(Cerebrospinal fluid, CSF)样本检测。并将抗体检测结果与随访15年以上的临床资料进行相关性分析。17例患者(9.5%)神经元抗体检测为阳性,分别为VGKC复合物(n=3),NMDAR(n=7),CASPR2(n=4) 和contactin-2(n=3),同时有3名(3/112,2.6%)健康对照者神经元抗体检测为阳性,VGKC复合物(n=1),NMDAR (n=2)(P=0.03)。虽然抗体滴度相对较低(细胞表面抗体≤ 1:100),但17例阳性样本中有8例(47%)可与活性海马神经元表面结合,提示具有潜在的致病性。在抗体阳性患者中更多见预先存在的认知障碍(9/17vs.33/161, P=0.01)。14例抗体阳性患者接受了规范的抗癫痫药物(AEDs)治疗。其中3例(17%)为耐药性癫痫,但与161例抗体阴性的患者中16例为耐药性癫痫(16人,10%)相比,不存在统计学差异。在6和/或12个月有随访样本的96例患者中,7例之前抗体阳性患者中6例抗体转阴,相反,另有7例患者在随访时第一次出现了抗体阳性。在9.5%的儿童新发癫痫患者中发现低水平的神经元抗体阳性,虽然抗体不一定会持续存在,但在随访中可见神经元抗体由阴性转为阳性,这表明抗体可能是由于神经元的损伤或炎症的继发反应所产生的。此外,由于抗体阳性的儿童癫痫患者对规范AEDs的反应和远期预后与抗体阴性患者没有差异,提示在儿童癫痫中常规进行神经元抗体检测意义不大。抗体阳性组中预先存在的认知障碍的发生率较高,17例患者中7例患者CASPR2和contactin-2抗体阳性,以及17例血清样品中8例与活性海马神经元的结合表明,即使是继发反应,神经元抗体也可能参与到儿童癫痫的共病发生中。

    Release date:2017-07-26 04:06 Export PDF Favorites Scan
  • 拉科酰胺在癫痫持续状态中的应用  —针对现有证据的系统评价

    拉科酰胺(Lacosamide,LCM)的静脉制剂具有良好的耐受性和安全性,促使其在癫痫持续状态(Status Epilepticus,SE)中得到应用。本项系统评价的目的是确定和评估 LCM 在 SE 中的使用情况。在电子数据库中用联合检索方式对 2008 年—2016 年 10 月的文献进行了系统检索,并使用标准化的评估表格从各项研究中将有关研究设计、方法框架、数据源、有效性和 LCM 引起的不良反应的信息进行提取并系统地报告。研究共评估了 522 次 SE 发作,其中包括 486 例成人和 36 例儿童及青少年发作,女性占 51.7%。LCM 的总体效力为 57%。LCM 对非惊厥性(57%,82/145)和全面痉挛性(61%,30/49,P=0.68)SE 的效力相似,但对局灶运动性 SE 的总体有效率更高(92%,34/39,P<0.001)。而 LCM 在用药次序靠后时其疗效从 100%下降到 20%。治疗期间的主要不良反应是眩晕,视力异常,复视和共济失调。总体而言,LCM 具有良好的耐受性,并且没有具临床意义的药物相互作用。现有数据表明 LCM 在 SE 中的使用是有前景的,有效率为 57%。LCM 的优势在于没有潜在的药物相互作用,并且在紧急情况需迅速增加剂量时可静脉使用。

    Release date:2018-09-18 10:17 Export PDF Favorites Scan
  • Research progress on the role of thrombospondin in synapse formation

    ObjectiveTo review the recent progress in the role of thrombospondins (TSPs) in synapse formation in the central nervous system (CNS).MethodsA wide range of domestic and foreign literature on the role of TSPs in the synapse formation of the CNS was reviewed. The role of TSPs in structural features, molecules, and related diseases was reviewed.ResultsAs an oligosaccharide protein, TSPs play important roles in angiogenesis, inflammation, osteogenesis, cell proliferation, and apoptosis. In the nervous system, they bind to voltage-dependent calcium channels, neuronectin, and other extracellular matrix proteins and cell surface receptors, and participate in and regulate multiple processes such as synapse formation, maturation, and function in the CNS.ConclusionTSPs as an oligomeric extracellular matrix protein play an important role in the formation of synapses and the repair of synapses after CNS injury.

    Release date:2019-01-03 04:07 Export PDF Favorites Scan
  • Research progress on the mechanism of chloride voltage-gated channel 7 gene-induced syndromic deafness-associated osteopetrosis

    Chloride voltage-gated channel 7 (CLCN7) gene mutations can cause the disorder of acidification in lacunas and osteolysis, leading to osteopetrosis characterized by increased bone density throughout the body and lysosomal storage diseases. Deafness can be caused by nerve injury for bone compression, negative pressure in the middle ear and otosclerosis. This article will introduce structure and function of CLCN7 gene and CLCN7 protein, osteolysis process, including the introduction of osteoclasts and the mechanism of osteolysis, osteopetrosis, mechanism and treatment of osteopetrosis caused by CLCN7 gene mutations, as well as osteopetrosis and syndromic deafness, in order to provide a basis for clinical diagnosis and treatment.

    Release date:2021-05-19 02:45 Export PDF Favorites Scan
  • SCN8A基因相关癫痫研究进展

    SCN8A基因编码电压门控钠离子通道亚基Nav1.6,该通道广泛分布于中枢神经系统,是动作电位产生及传导的重要分子基础。SCN8A基因突变与一系列由轻到重的疾病表型谱相关,其中包括良性家族性婴儿惊厥、中间型癫痫、癫痫性脑病、智力障碍、孤独症谱系疾病、孤立性肌阵挛等。文章旨在在提高医务人员对SCN8A基因相关疾病认识,将围绕发病机制、临床特征、遗传学特点、治疗等方面进行阐述。

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