2,3,7,8-四氯二苯并二噁英急性染毒对小鼠脑组织中Na+-K+-ATP酶和Ca2+-ATP酶活力的影响

目的 研究2,3,7,8-四氯二苯并二噁英(TCDD)对小鼠脑组织中Na+-K+-ATP酶、Ca2+-ATP酶活力的影响.方法 将48只雌雄各半的昆明种小鼠按性别随机分为高、中、低剂量TCDD染毒组和对照组,每组雌雄各6只,TCDD染毒剂量分别为100、10、1 μg/kg,用腹腔注射的方式一次染毒,48 h后,测定脑组织中Na+-K+-ATP酶、Ca2+-ArrP酶活力.结果 雌性低剂量、中剂量染毒组和雄性高剂量染毒组小鼠脑组织中Na+-K+-ATP酶活力[分别为(17.35±3.07)、(16.13±2.42)、(20.25±2.72)μmolPi·mg pro-1·h-1]明显升高,与对照组[分别为(13.60±1.72)、(15.97±1.90) μmol Pi·mg pro-1·h-1相比,差异均有统计学意义(P<0.05).各染毒组小鼠Ca2+-ATP酶活力有增加的趋势,但与对照组比较,差异无统计学意义(P>0.05).结论 TCDD急性染毒能提高小鼠脑组织中Na+-K+-ATP酶的活力,且存在性别差异.     

2,3,7,8-四氯二苯并二噁英急性染毒对小鼠脑组织中Na+-K+-ATP酶和Ca2+-ATP酶活力的影响

目的 研究2,3,7,8-四氯二苯并二噁英(TCDD)对小鼠脑组织中Na+-K+-ATP酶、Ca2+-ATP酶活力的影响.方法 将48只雌雄各半的昆明种小鼠按性别随机分为高、中、低剂量TCDD染毒组和对照组,每组雌雄各6只,TCDD染毒剂量分别为100、10、1 μg/kg,用腹腔注射的方式一次染毒,48 h后,测定脑组织中Na+-K+-ATP酶、Ca2+-ArrP酶活力.结果 雌性低剂量、中剂量染毒组和雄性高剂量染毒组小鼠脑组织中Na+-K+-ATP酶活力[分别为(17.35±3.07)、(16.13±2.42)、(20.25±2.72)μmolPi·mg pro-1·h-1]明显升高,与对照组[分别为(13.60±1.72)、(15.97±1.90) μmol Pi·mg pro-1·h-1相比,差异均有统计学意义(P<0.05).各染毒组小鼠Ca2+-ATP酶活力有增加的趋势,但与对照组比较,差异无统计学意义(P>0.05).结论 TCDD急性染毒能提高小鼠脑组织中Na+-K+-ATP酶的活力,且存在性别差异.     

氰戊菊酯对小鼠组织中ATP酶活性的影响

[目的]探讨氰戊菊酯对小鼠组织中ATP酶活性的影响. [方法]将小鼠随机分为高剂量组(染毒剂量27.2 mg/kg)、中剂量组(染毒剂量13.6mg/kg)、低剂量组(染毒剂量6.8mg/kg)和1个对照组,染毒后测定组织中ATP酶活性. [结果]染毒后,高、中、低染毒组和对照组肝组织中Na+-K+-ATP酶活性分别为16.879±4.587、18.659±3.314、21.174±4.006、24.175±3.832 μmol·L-1·mg pro-1·h-1;肾组织中各组活性分别为9.275±3.580、12.012±2.640、13.093±1.883、15.034 ± 3.383 μmol·L-1·mg pro-1·h-1;脑组织中各组活性分别为15.490±3.399、18.208±3.127、19.825±2.520、21.065±2.658μmol·L-1·mg pro-1·h-1;高、中、低染毒组和对照组肝组织中Ca2+-Mg2+-ATP酶活性分别为15.371±3.386、18.297±3.654、20.307±3.835、22.146±3.746 μmol·L-1·mg pro-1·h-1;肾组织中各组活性分别为7.753±2.025、11.711±2.396、15.284±3.812、17.047±4.042 μmol·L-1·mg pro-1·h-1;脑组织中各组活性分别为13.835±3.415、16.895±2.778、18.446±2.243、20.027±3.380 μmol·L-1·mg pro-1·h-1.与对照组相比,各染毒组Na+-K+-ATP酶和Ca2+-Mg2+-ATP酶活性有降低的趋势.肝、脑、肾的高剂量组和中剂量组的Na+-K+-ATP和Ca2+-Mg2+-ATP酶均低于对照组,差异有统计学意义(P<0.05). [结论]氰戊菊酯对ATP酶有抑制作用,可能对机体组织和细胞有损害作用.     

邻苯二甲酸二甲酯对小鼠肝脏Ca2+-Mg2+-ATP酶和Na+-K+-ATP酶的影响

目的探讨邻苯二甲酸二甲酯(DMP)对小鼠肝脏Ca~(2+)-Mg~(2+)-ATP酶和Na~+-K~+-ATP酶活力的影响。方法将80只雌雄各半的健康清洁级C57BL/6J小鼠随机分为对照(纯玉米油)组和0.5、1.0、2.0 g/kg DMP染毒组,每组20只,雌雄各半。采用灌胃的方式进行染毒,灌胃体积为10 ml/kg,每天灌胃1次。分别在灌胃20、40 d后,每组选择10只小鼠(雌雄各半)测定肝脏Ca~(2+)-Mg~(2+)-ATP酶和Na~+-K~+-ATP酶的活力。结果灌胃20 d时,与对照组比较,各剂量DMP染毒组雄性小鼠肝脏的Ca~(2+)-Mg~(2+)-ATP酶活力以及1.0、2.0 g/kg DMP染毒组雄性小鼠肝脏的Na~+-K~+-ATP酶活力均较低,差异有统计学意义(P0.05);0.5、2.0 g/kg DMP染毒组雌性小鼠肝脏的Ca~(2+)-Mg~(2+)-ATP酶活力以及2.0 g/kg DMP染毒组雌性小鼠肝脏的Na~+-K~+-ATP酶活力均较高,差异有统计学意义(P0.05)。灌胃40 d时,与对照组比较,各剂量DMP染毒组雄性小鼠肝脏Ca~(2+)-Mg~(2+)-ATP酶活力无明显变化,0.5 g/kg DMP染毒组雄性小鼠肝脏的Na~+-K~+-ATP酶活力较高,差异有统计学意义(P0.05);各剂量DMP染毒组雌性小鼠肝脏的Ca~(2+)-Mg~(2+)-ATP酶和Na~+-K~+-ATP酶活力均较低,差异有统计学意义(P0.05)。结论 DMP经口染毒对小鼠肝脏的Ca~(2+)-Mg~(2+)-ATP酶和Na~+-K~+-ATP酶活力具有干扰作用,雌性小鼠比雄性小鼠更敏感。     

魔芋多糖对小鼠瘦素和Na~+-K~+-ATP酶水平的影响

目的探讨魔芋多糖对高脂饮食小鼠血清瘦素和小肠粘膜Na+-K+-ATP酶水平的影响。方法将实验动物分为正常对照组、高脂对照组和高、中、低剂量魔芋多糖与高脂联合处理组共5个组,连续喂饲20天,用ELISA法测定血清瘦素水平,分光光度法测定小肠粘膜Na+-K+-ATP酶活性以及体重、体脂、血糖等指标。结果第10天高脂对照组的体重和餐后血糖为(31.3±2.11)g和(7.5±1.15)mmol/L,魔芋多糖高剂量组则为(28.0±2.06)g和(4.8±0.73)mmol/L。第20天高脂对照组的血清瘦素浓度和小肠粘膜Na+-K+与高脂联合处理-ATP酶活性为(1078.5±61.69)pg/ml和(16.2±1.48)μmolPi/(mg pro·h),魔芋多糖高剂量与高脂联合处理组则为(820.5±58.52)pg/ml和(11.2±1.10)μmolPi/(mgpro·h)。两组间各项指标差别均有显著性意义(P<0.05)。结论魔芋多糖能够降低高脂饮食小鼠餐后血糖、血清瘦素水平和小肠粘膜Na+-K+-ATP酶活性,抑制体重和体脂的增加。     

bFGF对慢性酒精中毒大鼠脑和肝组织ATP酶活力的影响

[目的]观察碱性成纤维细胞生长因子(bFGF)对慢性酒精中毒大鼠脑组织及肝组织Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力,探讨bFGF对慢性酒精中毒所致的脑损伤、肝损伤的保护作用。[方法]选择成年Wistar雄性大鼠,采用白酒灌胃建立慢性酒精中毒模型,慢性酒精中毒模型建立成功的大鼠随机抽签法分为酒精中毒对照组、生理盐水(NS)对照组和bFGF治疗组,每组10只。另10只不灌白酒作为正常对照组。bFGF治疗组大鼠白酒灌胃的同时,1 h后按12μg/kg剂量肌肉注射,共14 d。各组大鼠到相对应的时间点取出各组大鼠脑组织、肝组织制成匀浆,测定脑组织、肝组织匀浆中Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力。[结果]与正常对照组相比,慢性酒精中毒后大鼠脑组织及肝组织中Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力均明显降低(P﹤0.01);经bFGF治疗后脑组织及肝组织中Na+-K+-ATP酶活力和Ca2+-Mg2+-ATP酶活力均明显高于酒精中毒对照组及NS对照组(P﹤0.05)。[结论bFGF能提高慢性酒精中毒脑组织和肝组织中Na+-K+-ATP酶活力及Ca2+-Mg2+-ATP酶活力,提示bFGF对慢性酒精中毒所致的脑损伤和和肝损伤具有保护作用。     

乙醇对家兔脑组织中生化指标的影响及其意义

目的探讨乙醇对家兔脑组织T生化指标的影响及意义。方法将家兔随机分为3个染毒剂量组,用45%的乙醇染毒,并对染毒后脑组织脂质过氧化指标、ATP酶活力进行测定与分析。结果与对照组比较,高、中剂量染毒组超氧化物歧化酶(SOD)活力、谷胱甘肽过氧化物酶(GSH-Px)、丙二醛(MDA)浓度均显著增高,差异具有统计学意义(P0.05,P0.01),同时Na+-K+-ATP酶活力、Ca2+-Mg2+-ATP酶活力均显著降低,差异亦具有统计学意义(P0.01)。结论脑组织脂质过氧化增强、ATP酶活力降低,可能是乙醇引起家兔中枢神经系统功能紊乱的生化机制之一。     

苯并[a]芘对大鼠海马组织氧化应激及ATP酶的影响

目的 通过研究苯并[a]芘(B[a]P)对大鼠行为学、海马氧化应激及ATP酶的影响,探讨B[a]P的神经行为毒性分子机制.方法 将120只21d龄雄性SD大鼠,随机分为空白对照组、植物油组(溶剂对照组),2.5、5.0、10.0 mg/kg B[a]P染毒组,每组24只.腹腔注射给药,每天1次,连续4周.染毒结束后,用Morris水迷宫和穿梭箱检测学习记忆能力;用化学比色法测定海马超氧化物歧化酶(SOD)、Na+-K+-ATP酶和Ca2+-Mg2+-ATP酶的活力及丙二醛(MDA)含量;用荧光标记方法测定海马Ca2+浓度.结果 各染毒组大鼠的水迷宫逃避潜伏期、穿梭箱主动回避反应潜伏期(AARL)和被动回避反应潜伏期(RARL)均明显高于空白对照组和溶剂对照组,水迷宫末次跨平台次数和穿梭箱主动回避反应次数(AARF)均明显低于空白对照组和溶剂对照组,差异均有统计学意义(P＜0.05);且呈剂量-效应关系.与空白对照组和溶剂对照组比较,染毒组大鼠海马组织SOD活力、Na+-K+-ATP酶和ca2+-Mg2+-ATP酶活力明显下降,且呈剂量-效应关系,差异均有统计学意义(P＜0.05).染毒组大鼠海马组织MDA含量、Ca2+浓度均明显高于空白对照组和溶剂对照组,且呈剂量-效应关系,差异均有统计学意义(P＜0.05).结论 B[a]P所致神经行为毒性,可能与染毒后大鼠海马组织氧化应激受损,Na+-K+-ATP酶和Ca2+-Mg2+-ATP酶活力下降有关.     

反式脂肪酸对小鼠大脑抗氧化系统及ATP酶的影响

目的探讨反式脂肪酸对小鼠大脑抗氧化系统及ATP酶的影响。方法将48只健康SPF级昆明系雄性小鼠随机分为4组,分别为对照组和25、50、100 mg/kg反式脂肪酸染毒组,每组12只。采用灌胃方式进行染毒,染毒容量均为10ml/kg,每天1次,连续染毒12周。测定小鼠脑组织中的超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、过氧化氢酶(CAT)、ATP酶的活力和丙二醛(MDA)、总蛋白的含量。结果与对照组相比,各剂量反式脂肪酸组小鼠脑组织中的抗氧化酶SOD、GSH-Px、CAT活力均降低,而脂质过氧化物MDA的含量升高;Na~+K~+-ATP酶和Ca~(2+)Mg~(2+)-ATP酶活力均降低,差异均有统计学意义(P0.05)。结论反式脂肪酸的摄入会引起小鼠脑组织抗氧化系统受损,同时,会降低脑组织中ATP酶的活力。     

邻苯二甲酸二辛酯和氯仿联合染毒对雄性小鼠脑组织脂质过氧化及能量代谢的影响

目的观察邻苯二甲酸二辛酯(dioctylphthalate,DOP)和氯仿(chloroform,CF)联合染毒对雄性小鼠脑的脂质过氧化及能量代谢的影响。方法将20只成年清洁级ICR雄性小鼠按照2×2析因设计随机分为4组,分别为对照(玉米油)组、DOP单独染毒组(1/10 LD50,540 mg/kg)、CF单独染毒组(1/10 LD50,112 mg/kg)和DOP(1/10 LD50,540 mg/kg)+CF(1/10LD50,112 mg/kg)联合染毒组,每组5只。灌胃染毒,连续15 d。测定小鼠脑组织中丙二醛(MDA)、一氧化氮(NO)含量、钙离子浓度和过氧化氢酶(CAT)、乳酸脱氢酶(LDH)、琥珀酸脱氢酶(SDH)、一氧化氮合酶(NOS)、ATP酶活力及线粒体膜电位。结果与对照组比较,仅CF单独染毒组小鼠脑组织中MDA的含量较高,CF单独染毒组及DOP+CF联合染毒组小鼠脑组织中Na+-K+-ATP酶、Ca2+-Mg2+-ATP酶、NOS活力和线粒体膜电位升高,DOP单独染毒组及DOP+CF联合染毒组小鼠脑组织中LDH、SDH活力和NO含量降低,差异均有统计学意义(P0.05);三组小鼠脑组织中CAT的活力及钙离子浓度均无明显改变。DOP+CF联合染毒对小鼠脑组织中的线粒体膜电位表现协同作用,Na+-K+-ATP酶活力表现为增强作用,MDA含量和LDH、SDH、Ca2+-Mg2+-ATP酶活力表现拮抗作用,而NOS活力、NO含量尚未表现出联合作用。结论DOP和CF联合染毒尚未造成小鼠脑组织脂质过氧化损伤,可促进其能量代谢。     

库存血液在室温及37℃预热时钠钾ATP酶和钙镁ATP酶活性变化

目的:为了解库存血液在室温25℃及37℃水浴预热时Na -K ATP酶和ca2 -Mg2 ATP酶活性的变化,给大量输血病人血液预热提供指导.方法:应用比色法分别检测45例合格的库存血液,在不同温度下红细胞膜Na -K ATP酶和Ca2 -Mg2 ATP酶活性,并对结果进行分析.结果:室温25℃30 min红细胞膜Na -K ATP酶活性为0.0143±0.00328(μmol·Pi/107RBC·h),Ca2 -Mg2 ATP酶活性为0.0129±0.00401(μmol·Pi/107 RBC·h);室温25℃ 2 h红细胞膜Na -K ATP酶活性为0.0142±0.00305(μmol·Pi/107 RBC·h),Ca2 -Mg2 ATP酶活性为0.0132±0.00307(μmol·Pi/107 RBC·h);37℃10 min红细胞膜Na -K ATP酶活性为0.0152±0.00374(μmol·Pi/107 RBC·h),ca2 -Mg2 ATP酶活性为0.0131±0.00515(μmol·Pi/107 RBC·h).结论:库存血液预热能使红细胞膜Na -K ATP酶和ca2 -Mg2 ATP酶活性明显升高.     

太极拳运动对中老年人红细胞膜Na+-K+ATP酶和Ca2+-Mg2+ATP酶活性的影响

目的：探讨太极拳运动对中老年人红细胞膜Na^ -K^ ATP酶和Ca^2 -Mg^2 ATP酶活性的影响。方法：选取64名练习太极拳的中老年人为观察组，另选47名很少参加体育锻炼者为对照组，采两组研究对象的静脉血，检测Na^ -K^ ATP酶和Ca^2 -Mg^2 ATP酶的活性。结果：观察组2种ATP酶活性均高于对照组（P＜0．01）；性别间差异无显著性（P＞0．05）；2种酶活性均与练拳时间呈正相关（P＜0．05）。结论：太极拳运动能提高中老年人红细胞膜Na^ -K^ ATP酶和Ca^2 -Mg^2 ATP酶活性，改善细胞代谢功能，练拳时间越长，效果越好，从而促进健康，延缓衰老。     

Enhancement of Ca2+-sensitive myosin ATPase activity by cadmium

The effects of Cd²⁺ on Ca²⁺-sensitive myosin ATPase activity were examined. In the absence of Ca²⁺, the Ca²⁺-dependent myosin ATPase activity was enhanced by Cd²⁺ to the same extent as with Ca²⁺ at concentrations ranging from 10⁻⁶ to 10⁻³ M. At 10⁻² M, however, no activation was observed. Zn²⁺, Co²⁺, and Sr²⁺ also activated the myosin ATPase. Sr²⁺ and Co²⁺ were less effective. Hg²⁺, Cr³⁺, and Cu²⁺ were essentially inactive. In the presence of below 10⁻³ M Ca²⁺, the increase in the enzyme activity observed on the addition of Cd²⁺ was in addition to that caused by Ca²⁺ alone. The ability of metal ions to activate myosin ATPase was compared with that to activate calmodulin-dependent cAMP phosphodiesterase. The activating effects of the metal ions tested were in the order of Ca²⁺ > Cd²⁺ > Zn²⁺ > Co²⁺ > Sr²⁺ for Ca²⁺-sensitive myosin ATPase and Ca²⁺ > Cd²⁺ > Sr²⁺ > Zn²⁺ > Hg²⁺ > Co²⁺ for cAMP phosphodiesterase. Cd²⁺ activated both enzyme activities most efficiently among the metal ions tested except Ca²⁺. These results indicate that Cd²⁺ is able to substitute for Ca²⁺ in the case of Ca²⁺ dependent enzymes, regardless of whether or not calmodulin participates in the activating process.     

Gossypol and Na+, K+ ATPase from human erythrocytes

The inhibition of Na+, K+ ATPase by gossypol has been proposed as a mechanism for the hypokalemia occurring in some patients receiving this drug. Gossypol acetic acid, 3 microM (higher concentration than present clinically), did not inhibit this enzyme prepared from erythrocytes from 5 humans. Thus, it is unlikely that gossypol inhibition of the usual form of this enzyme is the mechanism for the initiation of the hypokalemia.     

Effect of simultaneous administration of vitamin E and pyridoxine on erythrocyte membrane Na+K+ ATPase activity

Vitamin E is known to have an interaction with pyridoxine. To understand the functional significance of this interaction a study was carried out on the effect of simultaneous administration of vitamin E and pyridoxine on erythrocyte membrane Na+K+ ATPase activity. Adult male volunteers belonging to low socio-economic class with prior consent were used as subjects for the study. The results of the study have shown that administration of vitamin E alone brings about a transient increase in the total and ouabain insensitive Na+K+ ATPase. Administration of B6 along with vitamin E brought about an increase in the total and true Na+K+ ATPase activity. B6 administration alone showed a statistically insignificant increase in true ATPase activity. The results of the study are interpreted to show that administration of vitamin E along with B6 is beneficial to membrane function.     

Ca2+-Mg2+ ATPase of mouse cardiac sarcoplasmic reticulum is affected by membrane n-6 and n-3 polyunsaturated fatty acid content

White mice, 18-20 g, were fed purified diets containing two weight percent safflower oil plus ten weight percent menhaden, corn, or olive oil for 2 wk. Menhaden oil ingestion resulted in significantly higher levels of 22:6(n-3) and 20:5(n-3), particularly 22:6(n-3), and lower levels of 20:4(n-6) and 18:2(n-6) in cardiac sarcoplasmic reticulum (SR) phospholipids than did corn or olive oil ingestion. These changes in fatty acid composition resulted in a significant decrease in the value of the n-6/n-3 fatty acid ratio of cardiac SR phospholipids. The ratio was 2.8 versus 0.2 in choline phospholipids and 1.9 versus 0.2 in ethanolamine phospholipids in SR of mice fed corn or menhaden oil, respectively. This reduction in the n-6/n-3 fatty acid ratio was associated with a lower relative activity of Ca2+-Mg2+ ATPase, and a lower initial rate of calcium transport and maximum calcium uptake in SR vesicles from mice fed menhaden oil rather than olive or corn oils. The specific activity of NADPH cytochrome C reductase (EC 1.6.2.3) of cardiac SR was not affected by dietary lipids. These data indicate that modification of SR by 22:6(n-3) may change the SR bilayer structure resulting in alteration of the calcium transport properties of SR vesicles. In addition, our results suggest that reduction of calcium flux across cardiac SR following fish oil consumption may also reduce the susceptibility of myocytes to rapid changes in calcium concentrations which may occur during ischemia and reperfusion.