硫酸镍对大鼠心肝肾ATPase毒性的实验研究

目的 探讨硫酸镍对心、肝、肾的毒作用及其机理。方法 对大鼠腹腔注射硫酸镍2.5、5.0、10.0dmg/kg连续10d染毒,制备心肌、肝及肾小管细胞膜,定磷比色法检测细胞Na^ .K^ -ATPase、Ca^2 -ATPase活性。结果 硫酸镍明显抑制心肌、肝、肾小管细胞膜Na^ .K^ -dATPasc、Ca^2 -ATPase活性,其抑制作用肾脏最强,心脏次之,肝脏最轻。结论 硫酸外长致心肝肾损伤与其抑制细胞膜ATPase活性有关。     

姜黄素抗家兔慢性心力衰竭的机制研究

目的：观察姜黄素对家兔慢性心力衰竭的治疗作用并探讨其机制.方法：采用主动脉瓣返流联合腹主动脉缩窄制作慢性心力衰竭家兔模型,心衰和假手术动物均进一步分为姜黄素组和安慰剂组.10wk后行超声心动图测定心动能的指标,检测左室心肌肌浆网Ca^2＋-ATP酶的表达水平.结果：与假手术组相比,心衰组、心衰姜黄素组左室内径增大、室壁增厚,射血功能、心肌肌浆网Ca^2＋-ATP酶的表达水平降低（P〈0.05）;与心衰组相比,心衰姜黄素组左室内径、室壁厚度较小,射血分数、心肌肌浆网Ca^2＋-ATP酶的表达水平较高（P〈0.05）.结论：姜黄素可改善兔慢性心力衰竭模型的心功能,其机制可能与增加肌浆网Ca^2＋-ATP酶的表达有关.     

Na~+/K~+-ATP酶α1亚单位小干扰RNA和哇巴因诱导肝癌HepG2细胞S期阻滞及其机制

目的 观察哇巴因联合Na~+/K~+-ATP酶(钠泵)α1亚单位小干扰RNA(siRNA)对人肝癌HepG2细胞增殖和细胞周期的影响.方法 分析人肝癌临床组织标本、正常肝组织和肝癌细胞系SMC7721、Bel7402和HepG2细胞钠泵α1亚单位的表达.CCK-8法检测采用钠泵α1亚单位siRNA和哇巴因作用肝癌HepG2细胞增殖抑制状况,分析各组细胞的钠泵活性变化,流式细胞术分析细胞周期变化.实时定量PCR和蛋白质印迹法检测钠泵α1、促分裂源活化蛋白激酶1(MAPK1)、细胞围期蛋白1(CyclinA)、周期蛋白依赖性激酶2(CDK2)、增殖细胞核抗原(PCNA)和细胞周期蛋白抑制因子(P21~(WSF1))表达的变化.结果 肝癌组织标本的钠泵α1亚单位密度值(174.7±16.8)明显高于正常肝组织(65.3±7.9,P<0.05);HepG2细胞钠泵α1亚单位表达明显高SMMC-7721和Bel-7402细胞(P<0.05).siRNA、哇巴因和联合用药可抑制HepG2细胞的增殖,联合实验组效果更显著(P<0.05),0.03μmol/L siRNA组、0.1 μmol/L哇巴因和联合实验组细胞24、48和72 h抑制率分别为17.4%、20.3%、24.3%,37.5%、44.3%、51.2%,52.3%、70.2%、88.2%.各实验组均出现钠泵活性降低,以联合实验组最显著(P<0.05).0.1 μmol/哇巴因和联合实验组HepG2细胞S期比例从24.2%上升至66.5%和75.2%;实时定量PCR和蛋白质印迹检测显示哇巴因组和联合实验组P21<'WAF1>表达上调而钠泵μ1亚单位、MAPK1、CyclinA、CDK2和PCNA表达下调.结论 钠泵α1亚单位siRNA联合哇巴因抑制HepG2细胞钠泵后可抑制细胞增殖,而P21~(WAF1)表达上调和CyclinA/CDK2/PCNA周期调控复合体生成减少可能是引起S期阻滞的主要原因.     

加减地黄饮子对局灶性脑缺血大鼠神经元保护作用的实验研究

目的:观察加减地黄饮子对局灶性脑缺血大鼠神经元的保护作用及其可能作用机制。方法:采用栓线法制作大鼠局灶性脑缺血损伤模型(MCAO)。120只Wistar大鼠随机分成6组:空白组,假损伤组,模型组,中药高剂量组,中药低剂量组,阿司匹林对照组,每组20只。连续灌胃7d后,进行手术操作。测定大鼠大脑皮层组织Na+-K+-ATP酶活性、Ca2+-ATP酶活性、SOD活性和MDA含量。结果:加减地黄饮子低剂量、高剂量组均能提高脑缺血大鼠大脑皮层组织的Na+-K+-ATP酶、Ca2+-ATP酶活性及SOD活性,降低MDA含量。结论:加减地黄饮子可对局灶性脑缺血大鼠脑组织神经元起保护作用,其脑保护作用机制可能与其调节Na+-K+-ATP酶和Ca2+-ATP酶活性、SOD活性和降低MDA含量有关。     

奥瑞合剂对反流性食管炎肝胃郁热证患者超微量Na~+-K~+-ATP酶和Ca~(2+)-Mg~(2+)-ATP酶的影响

目的:观察奥瑞合剂对反流性食管炎(reflux esophagitis,RE)患者食管组织超微量Na~+-K~+-ATP酶(ultramicro Na~+-K~+-ATPase,u Na KATPase)和超微量Ca~(2+)-Mg~(2+)-ATP酶(ultramicro Ca~(2+)-Mg~(2+)-ATPase,u Ca Mg ATPase)的影响。方法:将60例反流性食管炎肝胃郁热证患者,随机分为治疗组和对照组,每组30例。两组患者均给予基础治疗,口服奥美拉唑肠溶胶囊。治疗组加用药奥瑞合剂治疗,对照组加用奥瑞合剂模拟剂治疗。治疗4周后比较两组患者的临床疗效,食管组织u Na KATPase和u Ca Mg ATPase指标以及胃镜变化。结果:治疗组有效率为96.43%,对照着有效率为74.07%,差异有统计学意义(P0.05);治疗后两组患者u Na KATPase和u Ca Mg ATPase指标均有升高,治疗组优于对照着,差异有统计学意义(P0.05);胃镜评分比较,治疗组有效率为96.43%,治疗组有效率为88.89%,两组比较,差异有统计学意义(P0.05)。结论:奥瑞合剂可以通过提高反流性食管炎肝胃郁热证患者食管组织u Na KATPase和u Ca Mg ATPase水平,从而改善食管下括约肌收缩与蠕动能力,实现对反流性食管炎的治疗。     

A Non-Ouabain Na/K Atpase Inhibitor Isolated from Bovine Hypothalamus. Its Relation to Hypothalamic Ouabain

We have isolated from bovine hypothalamic and pituitary tissue the sodium pump inhibitor HHIF that is structurally different from ouabain. By mass spectrometric analysis this purified factor revealed a single unique molecular ion with an accurate mass of 412.277 and a mass spectra different from ouabain. It has been previously shown that HHIF inhibits the Ca²⁺-ATPase of the plasma membrane of synaptosomes. HHIF increases free calcium levels in cultured rat mesangial cells as well as mesangial cell contraction and proliferation. With the same purification procedure we have isolated in parallel HHIF and Ouabain from central nervous tissue. Ouabain elutes prior to HHIF in the final purification HPLC systems. This endogenous Ouabain has, in all the systems tested, the same chromatographic behavior that synthetic cold or [³H] Ouabain     

Rabeprazole: the role of proton pump inhibitors in Helicobacter pylori eradication

Proton pump inhibitors have become one of the cornerstones in the treatment of Helicobacter pylori infection. Rabeprazole (Pariet^®) is a substituted benzimidazole proton pump inhibitor with potent gastric acid suppression properties. Its high acid–base dissociation constant allows activation over a broader pH range, resulting in quick, irreversible binding to the H⁺/K⁺-ATPase pump, and a more rapid onset of action compared with omeprazole, lansoprazole and pantoprazole. Unlike other proton pump inhibitors, the metabolism of rabeprazole is primarily via a nonenzymatic reduction to the thioether derivative, and the cytochrome P450 isoenzyme 2C19 is only partly involved in its metabolism. The effect of genetic polymorphism in cytochrome P450 isoenzyme 2C19 on the pharmacokinetics and pharmacodynamics of rabeprazole is therefore limited. In humans, once-daily dosing of 5–40 mg of rabeprazole inhibits gastric acid secretion in a dose-dependent manner. In vitro studies have shown that rabeprazole possesses more potent antibacterial properties against the growth of H. pylori than other proton pump inhibitors. Furthermore, its thioether derivative has more potent inhibitory in vitro activity against the growth and motility of clarithromycin-resistant H. pylori than other proton pump inhibitors or commonly used antimicrobials. Despite these inherent favorable characteristics of rabeprazole, randomized controlled trials have largely shown equivalence amongst proton pump inhibitors when used with two antibiotics in the eradication of H. pylori, with cure rates of 75–89% on an intent-to-treat basis. However, rabeprazole appears to consistently achieve such comparable eradication rates even when used at reduced doses (10 mg twice daily) as part of clarithromycin-based triple therapy.     

染料木素抗大鼠心肌肥厚作用及其与ATPase活性的关系

目的:观察染料木素(Gen)对异丙肾上腺素(iso)所致大鼠心肌肥厚的保护作用及其对心肌组织Na+-K+-ATPase,Ca2+-Mg2+-ATPase活性及羟脯氨酸含量的影响。方法:0.2 g·L-1的iso 5 mL·kg-1·d-1,背部皮下注射,连续10 d,建立大鼠心肌肥厚模型。造模第2天开始给予不同浓度的染料木素、二甲基亚砜或NS,连续14 d,末次给药后禁食12 h,称体重,麻醉,取心脏,称全心及左心室质量,计算全心质量指数及左心室质量指数,测定心肌组织Na+-K+-ATPase,Ca2+-Mg2+-ATPase活性及羟脯氨酸(Hyp)含量。结果:模型组全心质量指数及左心室质量指数分别为(3.30±0.24),(2.55±0.14)mg·kg-1,与正常对照组相比显著升高(P<0.001);心肌组织Na+-K+-ATPase和Ca2+-Mg2+-ATPase活力为(1.81±0.25),(1.00±0.22)U·mg-1,与正常对照组相比活性显著降低(P<0.01);Hyp含量为(0.80±0.05)mg·g-1,与正常对照组相比含量显著升高(P<0.001)。与模型组相比,染料木素高、低剂量组(0.3,0.1μmol.kg-1)全心质量指数分别为(2.83±0.22),(2.97±0.19)mg·kg-1;左心室质量指数分别为(2.32±0.16),(2.34±0.13)mg·kg-1均显著降低(P<0.01或P<0.05);高剂量组心肌组织Na+-K+-ATPase(2.58±0.40)U·mg-1及Ca2+-Mg2+-ATPase(1.35±0.22)U·mg-1活性升高(P<0.01或P<0.05),染料木素高、低剂量组心肌组织Hyp含量分别为(0.48±0.11),(0.57±0.14)mg·g-1显著降低(P<0.01或P<0.05)。结论:染料木素可通过提高Na+-K+-ATPase及Ca2+-Mg2+-ATPase的活性,降低Hyp含量,从而抑制心脏纤维化,起抗心肌肥厚作用。     

Inverse relationship between colonic (Na+ + K+)-ATPase activity and degree of mucosal inflammation in inflammatory bowel disease

In inflammatory bowel disease (IBD), mucosal damage and loss of colonic function are regarded as major consequences of inflammation. Decreased colonic (Na⁺ + K⁺)-ATPase activities with diminished reabsorption of sodium and water have been found in active stages of ulcerative colitis. In this study, we report an inverse relationship between colonic (Na⁺ + K⁺)-ATPase activity and the degree of mucosal inflammation in 19 patients with IBD of mild to moderate disease activity. Various macroscopic and histologic types of mucosal lesions were differently associated with the (Na⁺ + K⁺)-ATPase activities. 5-nucleotidase activity was not associated with the degree of mucosal inflammation or the kind of macroscopic or histologic lesions. Our findings support the view that, in contrast to 5-nucleotidase, (Na⁺ + K⁺)-ATPase activity may better reflect the severity of mucosal damage and the degree of inflammation in IBD.