Effects of catecholamine-β-adrenoceptor-cAMP system on severe patients with heart failure

Objective To investigate the association between catecholamine-β-adrenoceptor (β-AR)-adenosine 3’, 5’-monophosphate (cAMP) system and long-term　prognosis in patients with chronic heart failure (CHF).Methods The study population comprised 73 patients with CHF (EF: 23%±10%) with a mean follow-up of 3.8±1.9 years. Plasma levels of norepinephrine (NE) were measured using high performance lipid chromatography, β-adrenergic receptor density (Bmax) and the content of cAMP in peripheral lymphocytes were calculated using 3H-dihydroalpneolo as ligand and competitive immunoassay, respectively. Deaths due to cardiovascular events within the follow-up period were registered.Results The total mortality was 64.7%, 57.4% of which was for cardiogenic (worsening heart failure: 32.4%; sudden death: 25.0%). In the cardiogenic death group, plasma levels of NE and epinephrine (E) (3.74 nmol/L±0.09 nmol/L and 3.17 nmol/L±1.0nmol/L) and the contents of peripheral lymphocyte cAMP (3.64 pmol/mg protein±1.4 pmol/mg protein) were significantly increased as compared with the survival group (2.68 nmol/L±0.07 nmol/L, 2.41 nmol/L±0.24 nmol/L and 2.73 pmol/mg protein±0.9 pmol/mg protein, respectively, all P<0.01). In the sudden death group, plasma levels of NE and E (5.01 nmol/L±0.06 nmol/L and 4.13 nmol/L±0.08 nmol/L) were significantly increased as compared with the worsening heart failure group (2.49 nmol/L±0.07 nmol/L and 2.33 nmol/L±0.8 nmol/L, all P<0.001) and to the survival group (2.68 nmol/L±0.07 nmol/L and 2.41 nmol/L±0.14 nmol/L, all P<0.01). The incidences of sudden death were 0%, 75%, and 100% (χ2=16.018, P<0.01) in patients with plasma NE<2.5 nmol/L, NE 2.5 nmol/L-4.5 nmol/L, and NE>4.5 nmol/L, respectively. In the worsening heart failure group, the content of peripheral lymphocyte cAMP (4.46 pmol/mg protein±0.18 pmol/mg protein) was significantly increased compared with the sudden death group (2.39 pmol/mg protein±0.9 pmol/mg protein, P<0.001) and to the survival group (2.73 pmol/mg protein±1.1 pmol/mg protein, P<0.001). The worsening heart failure death occurences were 5.0%, 72.2%, and 100% (χ2=14.26, P<0.01) in patients with a content of peripheral lymphocyte cAMP <2.5 nmol/L, cAMP 2.5 nmol/L-4.5 nmol/L, and cAMP>4.5nmol/L, respectively. Bmax in peripheral lymphocyte was not significantly different (P>0.05) among the sudden death, worsening heart failure, and survival groups in CHF patients.Conclusions Plasma levels of catecholamine increase significantly, and Bmax and the contents of cAMP in peripheral lymphocytes decrease significantly in patients with CHF. High plasma catecholamine levels may be associated with sudden death, and high intralymphocyte cAMP content may be associated with worsening heart failure in CHF patients.     

利多卡因对小鼠短暂全脑缺血后学习记忆障碍和胆碱能系统损害的影响

目的:观察利多卡因对不同ApoE基因型小鼠短暂全脑缺血后学习记忆障碍和中枢胆碱能系统损害的影响.方法:健康雄性C57BL/6J野生型小鼠(C57小鼠)和ApoE基因敲除型小鼠(ApoE小鼠)各随机分为3组:C57对照组(假手术操作,不夹闭双侧颈总动脉)C57缺血组(夹闭双侧颈总动脉17 min,经腹腔给予生理盐水)C57利多卡因组(夹闭双侧颈总动脉17 min,经腹腔给予利多卡因)ApoE对照组(处理同C57对照组)ApoE缺血组(处理同C57缺血组)ApoE利多卡因组(处理同C57利多卡因组).术后恢复7 d,从第8天起进行Morris水迷宫测试,连续5 d.术后第12天水迷宫测试后断头处死大鼠,分离双侧大脑皮层和海马测定乙酰胆碱酯酶、胆碱乙酰基转移酶活性和M受体结合活性.结果:(1)潜伏期:各缺血组均明显长于同品系相应的对照组,C57利多卡因组还明显长于C57缺血组[测试第3天(74.1±32.7)s比(49.2±19.5)s],但ApoE利多卡因组明显短于ApoE缺血组[测试第3～5天分别为(40.7±27.7)s比(84.7±26.8)s,(31.2±19.2)s比(72.1±33.0)s,和(28.0±22.1)s比(60.8±26.9)s](P＜0.05或0.01).两品系间比较,ApoE缺血组明显长于C57缺血组,但ApoE利多卡因组明显短于C57利多卡因组(P＜0.05或0.01).(2)有效搜索策略百分比:各缺血组均明显低于同品系相应的对照组,C57利多卡因组还明显低于C57缺血组[测试第3～5天分别为(18.2±11.7)%比(41.7±17.7)%,(22.7±20.8)%比(55.6±20.8)%,和(29.6±27.0)%比(66.7±21.7)%],但ApoE利多卡因组明显高于ApoE缺血组[测试第3～5天分别为(41.7±25.8)%比(15.6±12.9)%,(58.3±20.4)%比(18.8±11.6)%,和(66.7±30.3)%比(28.1±20.9)%](P＜0.01).两品系间比较,ApoE缺血组明显低于C57缺血组,但ApoE利多卡因组明显高于C57利多卡因组(P＜0.01).(3)胆碱能系统指标:各缺血组明显低于同品系相应的对照组,C57利多卡因组还明显低于C57缺血组,但ApoE利多卡因组明显高于ApoE缺血组(P＜0.05或0.01).两品系间比较,ApoE利多卡因组明显高于C57利多卡因组(P＜0.05或0.01).结论:短暂全脑缺血导致小鼠明显的脑损害,表现为学习记忆功能障碍和中枢胆碱能系统功能损害;ApoE小鼠学习记忆功能障碍的程度较C57小鼠更重.利多卡因加重了短暂全脑缺血所导致的C57小鼠脑损害,但可减轻ApoE小鼠的脑损害程度.     

Protein kinase C in the promyelocytic leukemia cell differentiation of granulocytes.

When the leukemia cells in 14 patients with acute promyelocytic leukemia (APL) were induced by all-trans retinoic acid (RA) treatment, the activity of protein kinase C (PKC) increased with the differentiation. In the control cells, the activity of PKC was only 47 +/- 39.3 pmol.mg-1/min, while it was 149.3 +/- 150.1 pmol.mg-1/min after differentiation. There were 90.1 +/- 7.2% promyelocytes in the control group, and 8.9 +/- 5.6% in the induction group. Therefore, we think that there is a close correlation between PKC and the differentiation of promyelocytic leukemia cells.

     

来源于肾上腺髓质素原的不同肽段对大鼠主动脉一氧化氮生成的影响

目的 :观察肾上腺髓质素 (ADM)对大鼠主动脉一氧化氮 (NO)生成的作用 ,以及肾上腺髓质素原N端 2 0肽 (PAMP)和肾上腺升压素 (ADT)对ADM这一作用的影响。方法 :ADM ,PAMP和ADT孵育离体大鼠主动脉 2h后 ,测定孵育液中亚硝酸盐的含量和所孵育组织中一氧化氮合酶 (NOS)的活性 ,其中亚硝酸盐的含量反映NO的生成量。结果 :ADM(10 -9～ 10 -7mol·L-1)浓度依赖地刺激大鼠主动脉组织亚硝酸盐的生成和NOS的活性。 10 -8mol·L-1的ADM孵育血管后 ,每毫克蛋白亚硝酸盐的生成量为 (0 .2 82± 0 .0 4 6) μmol,NOS活性为 (0 .3 2 3± 0 .0 5 6)pmol·min-1,显著高于对照组 [每毫克蛋白 (0 .173± 0 .0 2 6) μmol和 (0 .110± 0 .0 2 8)pmol·min-1,P <0 .0 1]。此浓度的ADM与相同浓度的PAMP或ADT共同孵育血管后 ,每毫克蛋白亚硝酸盐的生成量为 (0 .2 0 4± 0 .0 4 9)或(0 .15 0± 0 .0 3 6) μmol,NOS活性为 (0 .178± 0 .0 2 3 )或 (0 .12 3± 0 .0 3 1) pmol·min-1;ADM ,PAMP和ADT三者共同孵育 ,每毫克蛋白亚硝酸盐的生成量为 (0 .162± 0 .0 2 9) μmol,NOS的活性为 (0 .110± 0 .0 2 4 ) pmol·min-1,均显著低于ADM (10 -8mol·L-1)单独孵育组 (P <0 .0 1)。无论PAMP还是ADT单独孵育血管组织均不影响其亚硝酸盐     

灌注色谱法快速分离纯化糖基化终产物

目的:寻找一种快速有效地分离体外制备糖基化终产物(AGEs) 的方法。方法:通过葡萄糖与牛血清白蛋白(BSA) 共同孵育体外制备AGEs- BSA, 建立快速灌注色谱法并优化各种参数,比较不同程度及药物干预糖基化反应后的分离结果。结果:经优化相关参数建立的快速灌注色谱法能满意地进行糖基化反应体系中AGEs- BSA和BSA的分析性和制备性分离,AGEs- BSA的峰高和峰下面积可作为糖基化程度的间接指标。结论:灌注色谱法是快速分离纯化糖基化终产物的理想方法     

Reactive oxygen species contribute to the induction of superoxide dismutase during heat shock in cultured rat neonatal cardiomyocytes

Objective To explore the influence of reactive oxygen species (ROS) during heat shock on the activity of superoxide dismutase (SOD) and the endurance of cardiomyocytes against hypoxia-reoxygenation damage. Methods Cultured rat neonatal cardiomyocytes were divided into 5 groups (n=6/group): normal control, anoxic control, heat shock, heat shock + SOD (150 U/ml) and exogenous ROS pretreated. Myocytes were first incubated in a CO(2)incubator (37℃) with Hank’s solution for 30 min, followed by specific pretreatment. Heat shock was performed by incubating the cells in a 43℃ incubator for 30 min; exogenous ROS were generated by the reaction of xanthine oxidase with xanthine. After the dishes were returned to normal incubation conditions for 24 h, myocytes underwent hypoxia (3 h) and reoxygenation (1 h). Results Compared with control groups, ROS production increased after the cells experienced heat shock (1.28±0.34 nmol/mg·protein vs 0.80±0.23 nmol/mg·protein and 0.74±0.20 nmol/mg·protein, P&lt;0.05) or ROS pretreatment (3.30±0.58 nmol/mg·protein, P&lt;0.05). 24 hours later, accompanied by attenuated cellular injury, significantly increased SOD activity was found in heat shock (2.55±0.43 U/mg·protein vs 0.77±0.12 U/mg·protein and 0.63±0.09 U/mg·protein, P&lt;0.05) and exogenous ROS pretreated (2.34±0.31 U/mg·protein, P&lt;0.05) groups following reoxygenation. Moreover, opposite results were found when myocytes were treated with SOD during heat shock. Conclusions The release of ROS during heat shock triggers delayed myocardial protection by altering the activity of SOD. ROS may play an important pathophysiological role in heat shock induced myocardial protection.     

实验性脊髓空洞前状态蛋白激酶C的活性变化及意义

目的 探讨蛋白激酶C(PKC)在脊髓空洞前状态中活性变化及其作用.方法 用新西兰兔56只制作模型.术后1、3、7、14、21 d用光镜、干湿重法观察上颈髓病理学演变、脊髓含水量,应用底物磷酸化法测定胞膜、胞浆PKC活性.结果 高岭土组动物于术后第1天脊髓含水量即有明显增加[(68.35±0.70)%],第7天达到高峰[(72.92±0.86)%],持续到第14天,至第21天时稍有缓解[(70.03±0.77)%];组织学观察发现术后3 d上颈髓轻度水肿,7～14 d水肿达到高峰期,21d略有缓解;胞膜PKC活性术后1 d出现增加(5.67±0.26 pmol·mg-1·min-1),7～14 d达到最高水平(13.27±3.15 pmol·mg-1·min-1),21 d开始回落(8.85±1.56pmol·mg-1·min-1),胞浆的PKC活性则呈相反趋势.结论 脊髓空洞前状态形成中出现PKC移位激活.参与了缺血、缺氧性脊髓水肿的形成.     

慢性乙型肝炎病毒感染对人肝细胞色素酶P450 3A4的影响

目的 探讨慢性乙型肝炎病毒(HBV)感染对人肝脏细胞色素酶3A4(CYP3A4)的影响,为慢性HBV感染患者安全用药提供指导.方法 收集慢性HBV感染患者和正常人的肝组织标本,匀浆后以差速离心法制备成微粒体.以睾丸酮为探针底物,用高效液相色谱(HPLC)方法建立体外检测CYP3A4酶代谢活性的技术平台,检测两组肝组织样本中CYP3A4的酶活性.以Western印迹法测定了两组肝组织样本中CYP3A4蛋白的表达差异.结果 HPLC检测显示,反映酶活力的指标Vmax慢性HBV感染组为(493±297)pmol·min-1·mg-1,正常对照组为(741±189)pmol·min-1·mg-1,两组差异有统计学意义(P=0.03),而酶系特征性常数Km值两组分别为(0.142±0.057)μmol/L,(0.121±0.024)μmol/L,差异无统计学意义(P=0.103).Western印迹测定CYP3A4蛋白表达两组差异有统计学意义(P=0.003),慢性HBV感染组CYP3A4蛋白表达为3.0±1.6,低于正常组的表达量(5.7±1.5).各样本酶活性和蛋白表达的相关系数为0.7683(P＜0.01),表明酶活性与蛋白表达呈现良好的相关性.结论 慢性HBV感染可降低肝脏CYP3A4酶蛋白的表达,导致酶活性下降,但是对酶的结构未产生影响.提示慢性HBV感染者在使用由CYP3A4代谢的药物时,要重视由于代谢变化导致的副作用.     

高游离脂肪酸血症对SD大鼠主动脉内皮细胞一氧化氮合酶活性及mRNA表达的影响

目的研究高游离脂肪酸(FFA)血症对大鼠血管内皮细胞一氧化氮合酶(eNOS)活性及表达的影响并探讨其可能的机制。方法雄性SD大鼠随机分成对照组和FFA组。对照组及FFA组大鼠分别经颈静脉插管输入生理盐水或20%脂肪乳 肝素6 h。输液结束后采集血清标本测定血中FFA、活性氧(ROS)、脂质过氧化产物丙二醛(MDA)、还原性谷胱甘肽(GSH)、高敏C反应蛋白(hs-CRP)以及NO水平。处死动物后取出主动脉,测定主动脉内皮细胞匀浆液中eNOS活性及eNOS mRNA水平。结果FFA组血FFA水平较对照组升高2~4倍,血清NOx水平明显降低,内皮细胞eNOS活性及mRNA水平明显低于对照组。FFA组血清ROS、MDA以及hsCRP水平明显升高,GSH水平降低。结论高FFA血症可抑制内皮细胞eNOS活性及表达,其机制可能涉及FFA所诱导的炎症反应和氧化应激。     

Experimental studies on the antagonistic effect of re du qing on endotoxin-induced damage of lysosomes and mitochondria

A rabbit endotoxic DIC model was preliminarily performed. The structures of lysosomes and mitochondria in liver cells were evidently destroyed as observed under electronic microscope, whereas those rabbits pretreated with Re Du Qing (RDQ, formerly named anti-inflammatory No. 6)--a mixture of Chinese traditional herbs providing antipyretic and detoxifying action, showed principally normal ultrastructure in liver cells. In lysosomal functional studies, the activity of the lysosomal marker enzyme--acid phosphate (ACP) was 79.0 +/- 4.7% (M +/- SD) in model group, higher than pretreated group (54.01 +/- 4.0%, P less than 0.01). Studies on the mitochondrial function showed that the significant criteria of the respiratory activity of mitochondria--respiratory control ratios (RCR) was 2.83 +/- 1.08 in model group and markedly lower than pretreated group (5.46 +/- 1.25, P less than 0.01). Mitochondrial ATPase activity (mu mol pi/min/mg pr.) was lower in model group (0.280 +/- 0.015) than in pretreated group (0.341 +/- 0.018, P less than 0.05). Lipid peroxide (LPO) in liver homogenates and serum were 1.86 +/- 0.43 n mol MDA/mg pr. and 12.26 +/- 0.84 n mol MDA/ml respectively in model group, whereas in pretreated group they gave a much lower value (1.19 +/- 0.12 and 6.55 +/- 2.97) respectively. Those data showed very significant difference between two groups (P less than 0.01). All of the above indices of pretreated group yielded values close to those of normal control group. The results of experimental study in vitro were identical to those of experimental study in vivo. These experimental studies suggested that RDQ provide antagonistic effect on endotoxin induced damage of lysosomes and mitochondria.     

Advanced glycosylation end products increase diacylglycerol levels in cultured human umbilical vein endothelial cells

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二甲双胍对慢性暴露于高糖及高游离脂肪酸的HIT-T15细胞胰岛素受体酪氨酸蛋白激酶活性的影响

目的 观察二甲双胍(MF)对慢性高糖和高脂处理后的HIT-T15细胞(β细胞系)胰岛素受体(IRc)酪氨酸蛋白激酶(TPK)活性的影响,探讨MF对β细胞糖脂毒性,即β细胞胰岛素抵抗的改善作用机制.方法 实验分为对照组、对照 MF组、高糖组、高糖 MF组、高脂组、高脂 MF组.将HIT-T15细胞分别接种于含有5.5 mmol/L、16.7 mmol/L葡萄糖(G)及0.5 mmol/L软脂酸的培养液中,培养48 h后,加入2.5 μg/mL MF干预24 h.用放射性酶分析法测定β细胞IRc TPK活性.结果 高糖[(52.5±18.6) pmol/(min·μg), P＜0.01],且与对照组相比差异无统计学意义.MF对对照组HIT-T15细胞IRc TPK活性无明显影响.结论 高糖和高脂可抑制β细胞IRc TPK活性.MF能明显改善受高糖及高脂所抑制的HIT-T15细胞IRc TPK活性,且恢复到接近正常水平.提示MF对糖脂毒性所致β细胞胰岛素抵抗的改善作用可能与增加IRc TPK活性有关.     

氨基胍对大鼠脊髓压迫伤后后肢运动功能的影响

OBJECTIVE: To study the effects of aminoguanidine (AG), the inhibitor of inducible nitric oxide synthase (NOS), on the recovery of rat hindlimb motor function after spinal cord injury and explore the possible mechanism. METHODS: Thirty rat models of spinal cord compression injury were established according to Nystrom's method. AG therapy was administered for 4 times at 1 h before and 8, 24, 36 h after the injury, and 24 h after the completion of the therapy, spectrophotography was performed to measure the content of NO and activity of NOS in the injured spinal cord, followed by flow cytometry for determining the apoptotic rate 48 h later. The evaluation of the hindlimb motor function recovery was conducted by electrophysiological method and by measuring the behavior scores. RESULTS: AG significantly decreased the NO content (from 2.2714+/-0.4239 micromol/g.pro to 0.8466+/-0.0477 micromol/g.pro, P <0.05) and NOS activity (from 0.3408+/-0.0228 U/mg pro to 0.2702+/-0.0148 U/mg pro, P <0.05) in the injured spinal cord. The apoptotic rats were also reduced (from 7.88% +/-0.79% to 3.10% +/-0.66%, P <0.05). Four weeks after the therapy, the behavior score of the rats improved from 7.1+/-4.5 to 17.3+/-4.7 (P <0.01), and the latency and amplitude of the motor evoked potentials improved from 0 ms to 8.89+/-0.91 ms and from 0 mv to 1.99+/-0.48 mv respectively, showing significant therapeutic effect of AG (P <0.05). CONCLUSION: AG can improve motor functions of injured spinal cord in rats, possibly resulting from decreased apoptotic cells of the neurons in the spinal cord in the early stages of the injury.     

Pim-3质粒构建体在大鼠活体肝组织的表达和活性的研究

目的 构建大鼠Pim-3绿色荧光蛋白（GFP）表达质粒并观察其在活体肝组织的表达和活性。方法采用逆转录-PCR的方法获取目的cDNA,重组质粒经酶切鉴定和测序;大鼠活体基因肝靶向性转染通过尾静脉流体力学注射法完成,肝细胞凋亡的诱导采用腹腔内注射内毒素和D-半乳糖胺（D-GaIN）来实现。动物分为A、B、C和D组（即正常、对照、空质粒和重组质粒组,每组8只）;肝组织GFP表达通过荧光显微镜、Pim-3表达通过逆转录（RT）-PCR方法检测;肝细胞凋亡采用缺口末端标记技术（TUNEL）分析和半胱天冬酶-3活性检测。结果成功构建GFP表达质粒pEGFP-N2／Pim-3;重组质粒和空质粒DNA通过流体力学注射法被成功转染人大鼠活体肝组织内;4组Pim-3的相对表达水平分别为0．06±0．02、0、0、0．49±0．15。D组与其他3组差异均有统计学意义（均P〈0．01）;4组肝细胞的凋亡指数（AI）分别为：（3．1±0．7）％,（72．5±6．1）％、（69．8±5．7）％和（4．9±1．2）％;肝组织半胱天冬酶-3活性分别为（60±15）、（147±55）、（142±50）和（76±27）pmol·min ·mg^-1,D组与B、C两组间差异有统计学意义（均P〈0．01）。结论 构建的重组体质粒pEGFP-N2／Pim-3能在大鼠活体肝组织内有效表达,并发挥其对肝细胞凋亡的抑制效应。     

The signal transduction pathway in the proliferation of airway smooth muscle cells induced by urotensin Ⅱ

Background Human urotensin Ⅱ (UⅡ) is the most potent mammalian vasoconstrictor identified so far. Our previous study showed that UⅡ is a potent mitogen of airway smooth muscle cells (ASMC) inducing ASMC proliferation in a dose-dependent manner. The signal transduction pathway of UⅡ mitogenic effect remains to be clarified. This study was conducted to investigate the signal transduction pathway in the proliferation of ASMC induced by UⅡ. Methods In primary cultures of rat ASMCs, activities of protein kinase C (PKC), mitogen-activated protein kinase (MAPK) and calcineurin (CaN) induced by UⅡ were measured. The effect of CaN on PKC and MAPK was studied by adding cyclosporin A (CsA), a specific inhibitor of CaN. Using H7 and PD98059, inhibitors of PKC and MAPK, respectively, to study the effect of PKC and MAPK on CaN. The cytosolic free calcium concentration induced by UⅡ was measured using Fura-2/AM. Results UⅡ 10-7 mol/L stimulated ASMC PKC and MAPK activities by 44% and 24% (P&lt;0.01), respectively, after incubating for 20 minutes. It increased CaN activity in a time-dependent manner, being 1.68 times as that of control for 24 hours (P&lt;0.01). It promoted the cytosolic free calcium concentration increase of 18% (P&lt;0.01). CsA 10-6 mol/L and H7 50 μmol/L inhibited UⅡ-stimulated CaN activity by 45% (P&lt;0.01) and 21% (P&lt;0.05), respectively, while PD98059 50 μmol/L had no effect on CaN activity (P&gt;0.05). CsA 10-6 mol/L inhibited UⅡ-stimulated PKC activity by 14% (P&lt;0.05), while having no effect on MAPK activity (P&gt;0.05). Conclusions UⅡ increases cytosolic free calcium concentration and activates PKC, MAPK and CaN. The signal transduction pathway between PKC and CaN has cross-talk.     

人肝脏星状细胞糖基化终产物受体表达的研究

目的　研究人肝脏星状细胞（ ＨＳＣ） 上糖基化终产物受体（ＲＡＧＥ） 的表达。方法　用生物素将体外制备的糖基化终产物（ ＡＧＥｓ － ＢＳＡ） 标记成配基,以细胞化学法显示细胞表面受体高亲和性结合。用反转录聚合酶链反应（ ＲＴ－ＰＣＲ） 检测ＡＧＥｓ 受体基因的表达。结果　细胞化学法显示ＡＧＥｓ － ＢＳＡ 与ＨＳＣ 呈高亲和性结合,部分被内化。用按人ＲＡＧＥ 基因序列设计的引物,反转录扩增出２８３ ｂｐ ＤＮＡ 片段。结论　人肝脏星状细胞表达的ＡＧＥｓ 受体可能在糖尿病人加速的肝纤维化过程中起一定作用     

双苯氟嗪对沙土鼠急性脑缺血性脑水肿的影响

目的　探讨新型钙通道阻滞剂双苯氟嗪 (Dip)对急性缺血性脑水肿的作用及机制。方法　选取 1 30只沙土鼠 ,随机分为假手术组、模型对照组、Dip 2 5mg/kg和 50mg/kg组 ,每组 2 0只。行双侧颈动脉结扎 (BCAL) ,制备沙土鼠急性全脑缺血模型。各组动物分别腹腔注射溶剂或不同剂量的Dip ,观察对脑组织Na+ 、K+ 和水含量及Na+ 、K+ ATP酶活性的影响。结果　BCAL后沙土鼠脑组织中的Na+ 和水含量显著高于假手术组 ,K+ 含量及Na+ 、K+ ATP酶活性则显著低于假手术组 ;Dip 2 5和50mg/kg组呈剂量依赖性改变 ,急性脑缺血所致的沙土鼠脑组织K+ 含量及Na+ 、K+ ATP酶活性降低(r=0 9981 )和Na+ 及水含量升高 ,差异有显著意义 (P <0 0 5或 0 0 1 ) ,且脑组织水含量与Na+ 、K+ ATP酶活性变化呈明显负相关 (r=- 0 9997,P <0 0 1 )。结论　Dip能通过改善BCAL所致钠钾泵功能失调而减轻缺血性脑水肿