粉防已碱对大鼠心肌微粒体ATPases的作用

体外在常规反应条件下,粉防已碱(Tet)对大鼠心肌微粒体Na⁺,K⁺-ATPase活性无明显影响,但浓度依赖性抑制Mg²⁺-ATPase(IC₅₀=179μmol/L).Tet 10和100μmol/L使哇巴因(Oua)抑制Na⁺,K⁺-ATPase的量效曲线平行右移.Tet 100μmol/L可显著提高低K⁺或高Ca²⁺浓度时的Na⁺,K⁺-ATPase活性,但未能明显增加低Na⁺浓度时该酶的活性.动力学分析提示Tet 100μmol/L增加Na⁺,K⁺-ATPase对ATP的亲和力,但不改变其最大反应速度。     

粉防己碱对犬缺血心肌的保护作用

粉防己碱（Ｔｅｔ）ｉｖ８００ｕｇ·ｋｇ－１可使麻醉犬血压—过性降低，与此同时对血流动力学诸项指标的影响较小。结扎犬冠脉后，能降低犬室颤的发生率及死亡率，降低缺血心肌丙二醛的形成，减少胞内ｃａ２＋的蓄积和ＣＰＫ的释放，以上结果表明，Ｔｅｔ对缺血心叽有良好的保护作用。     

粉防己碱对犬缺血心肌的保护作用

粉防己碱(Tet)iv800ug·kg^-1可使麻醉犬血压—过性降低,与此同时对血流动力学诸项指标的影响较小。结扎犬冠脉后,能降低犬室颤的发生率及死亡率,降低缺血心肌丙二醛的形成,减少胞内ca²⁺的蓄积和CPK的释放,以上结果表明,Tet对缺血心叽有良好的保护作用。     

粉防己碱抑制自发性高血压大鼠心肌纤维化

目的：观察粉防己碱对自发性高血压大鼠心肌胶原和心肌僵硬度的作用。方法：测定羟脯氨酸表示胶原的量，胃酶抽提法和ＳＤＳ－ＰＡＧＥ方法测定胶原Ⅰ／Ⅲ型比例，离体灌注大鼠心脏测定左室心肌舒张僵硬度。结果：粉防己碱显著降低心肌胶原浓度和含量，降低胶原Ⅰ／Ⅲ型比例，改善心肌舒张僵硬度。结论：粉防己碱因其有效的抗纤维化作用，能逆转心肌舒张功能障碍。     

粉防己碱对缺血顿抑大鼠心肌功能和ATP酶活力的影响

目的：观察粉防己碱（ｔｅｔｒａｎｄｒｉｎｅ，Ｔｅｔ）对缺血顿抑心肌的保护作用并分析与心肌ＡＴＰ酶活力的关系。方法：离体大鼠工作心脏，全心缺血３０ｍｉｎ再灌４０ｍｉｎ，无机磷显色法分析ＡＴＰ酶活力。结果：顿抑心肌收缩舒张功能均明显降低，再灌期末ＬＶＳＰ×ＨＲ仅恢复５２％±８％，ＬＶＥＤＰ抬高２９８％±６４％，ＣＯ仅恢复４０％±８％，心肌细胞膜和线粒体Ｎａ＋，Ｋ＋－ＡＴＰ酶和Ｃａ２＋，Ｍｇ２＋－ＡＴＰ酶活力均下降，Ｔｅｔ（３０ｍｇ·ｋｇ－１·ｄ－１，ｉｐ，３ｄ，１０μｍｏｌ·Ｌ－１灌流缺血全程）可使ＬＶＳＰ×ＨＲ恢复８５％±１２％，ＬＶＥＤＰ仅抬高１６６％±４４％，ＣＯ恢复７５％±１１％，心肌细胞膜及线粒体Ｎａ＋，Ｋ＋－ＡＴＰ酶和Ｃａ２＋，Ｍｇ２＋－ＡＴＰ酶活力增高。结论：Ｔｅｔ对心肌缺血后顿抑损伤有一定保护作用，这一作用与维护顿抑期心肌细胞ＡＴＰ酶活力有关。     

粉防己碱对大鼠脑细胞内游离钙的影响

利用荧光钙指示剂Ｆｕｒａ－２／ＡＭ，测定脑细胞内游离钙的浓度，细胞内静息钙浓度为２２１±１８ｎｍｏｌ·Ｌ＾－１。Ｔｅｔ３０μｍｏｌ·Ｌ＾－１对细胞内静息钙无影响。Ｔｅｔ（１－１００μｍｏｌ·Ｌ＾－１）能抑制胞外高钾引起的胞内钙升高，其ＩＣ５０为８．２（９５％可信限为１．８９－３２．９０μｍｏｌ·Ｌ＾－１）。Ｔｅｔ３０μｍｏｌ·Ｌ＾－１可抑制去甲肾上腺素１０μｍｏｌ·Ｌ＾－１引起细胞内钙升高，其幅…     

粉防己碱的抗炎作用与炎症白细胞cAMP的关系

目的　研究粉防己碱 (tetrandrine,Tet)的抗炎作用与炎症白细胞cAMP的关系。方法　在大鼠胸膜腔内注射角叉菜胶 (1 0mg·kg- 1 )复制胸膜炎 ,并于致炎前 30min腹腔注射Tet。用常规方法测量胸膜腔渗出液量 ,用试管稀释法计数渗出液中白细胞数 ,用放射免疫分析法、间接法、酶放射化学分析法和荧光比色法 ,分别测定炎症白细胞cAMP浓度、腺苷酸环化酶 (AC)、磷酸二酯酶 (PDE)活性及胞质内游离钙浓度 ([Ca2 + ] i) ;体外观察细胞外钙对Tet调节炎症白细胞PDE活性的作用。结果　Tet(1 0～ 80mg·kg- 1 )腹腔注射 ,剂量依赖地降低胸膜腔渗出液量和白细胞游出数 ,同时增加白细胞cAMP浓度 ;Tet亦剂量依赖地降低炎症白细胞PDE活性及 [Ca2 + ] i,但对白细胞AC活性无明显影响。Tet抑制炎症渗出的作用与其增加白细胞cAMP浓度的作用呈线性相关 ;其增加白细胞cAMP浓度的作用则与其抑制PDE活性呈线性相关 ;后者与其降低 [Ca2 + ] i 呈线性相关。在体外 ,Tet抑制细胞外Ca2 + 和A2 31 87引起的PDE活性升高 ,其抑制作用可因细胞外钙浓度增加而逆转。结论　增加炎症白细胞cAMP浓度可能是Tet重要的抗炎作用机制之一 ;Tet主要通过降低炎症白细胞 [Ca2 + ] i从而抑制PDE活性并最终减少cAMP降解 ,Tet对AC活性无明显影响     

粉防己碱对大鼠心肌细胞电压依赖性钙通道的作用

运用钙离子荧光指示剂Ｆｕｒａ－２／ＡＭ，检测了粉防己碱（Ｔｅｔ）对成年大鼠心室肌细胞电压依赖性钙通道的影响。结果显示：基础状态下心肌细胞内钙离子（［Ｃａ２＋］ｉ）为１６２．６±７．３ｎｍｏｌ·Ｌ－１，５０ｍｍｏｌ·Ｌ－１氯化钾能使［Ｃａ２＋］ｉ增加至４８０．８±９．３ｎｍｏｌ·Ｌ－１（Ｐ＜０．０１），在无细胞外钙条件下，这种增加作用消失，而预先给予Ｔｅｔ和维拉帕米（Ｖｅｒ）则能阻断高钾升高［Ｃａ２＋］ｉ的作用。结果提示：Ｔｅｔ是通过阻断电压依赖性钙通道而发挥作用的。     

粉防己碱对培养大鼠心肌细胞胞内游离钙的影响(英文)

目的:研究粉防己碱对心肌的作用。方法:采用Fura-2和AR-CM-MIC阳离子测定系统测定培养大鼠单个心肌细胞胞内游离钙。结果:外钙1.3mmol·L~(-1)时,细胞静息钙为90±12nmol·L~(-1)。粉防己碱不影响静息钙,但可明显抑制CaCl_2,KCl,哇巴因引起的胞内钙增高;对于去甲肾上腺素引起的胞内钙增高,粉防己碱只有在外钙存在时,方对其有抑制作用。结论;粉防己碱抑制钙离子的跨膜运动,但在心肌细胞,它并非是选择性的钙通道阻滞剂。     

The effect of buthobendin on human erythrocyte membrane ATPases

The effect of buthobendin (CravitenR) on the ATPase activities/total (Na, K, Mg)-ATPase, and the ouabaine-sensitive (Na, K-ATPase) and insensitive (Mg-ATPase) fractions/from human erythrocyte membrane was examined in the presence or absence of liposomes. The activities of both ATPase fractions increased by 250% in the presence of 10 mmol/l phosphatidylcholine. Buthobendin inhibited both ATPases, but especially Na, K-ATPase. This inhibitory effect was much greater in the hydrophobic milieu of liposomes. The inhibitory effect was proportional to the drug concentration and was stereospecifically related only to the 2S, 2'S isomer. Isomer 2R, 2'R and epinephrine used for comparison did not show any similar inhibitory influence. The decrease in ouabaine-sensitive ATPase activity under the influence of buthobendin might cause changes in cation distribution and cell membrane polarization. An inhibitory effect was also observed in vivo, after single iv administration of buthobendin to patients with ventricular arrhythmias and elevated activities of both erythrocyte membrane ATPases. Complete normalization of cardiac rhythm in about 30% of patients was accompanied - in the sensitive group of patients - with a decrease in Mg-ATPase activity without any changes in elevated Na, K-ATPase activity. In the group of patients resistant to buthobendin therapy both ATPases remained unchanged.     

预先给予粉防己碱对大鼠工作心脏缺血再灌注损伤的保护作用

预给粉防己碱１５ｍｇ·ｋｇ￣（－１）每日２次连续３ｄ可以减轻大鼠工作心脏缺血再灌注心肌损伤；促进冠脉流出液，心输出量的恢复；防止左心室舒张末期压和等容舒张期左室内压下降时间常数的升高；抑制肌酸激酶释放；维持心肌线粒体Ｃａ￣（２＋）稳态。以上结果与硝苯地平关似。本研究表明粉防己碱对心肌缺血再灌注损伤具有较好的保护作用，以对心肌舒张功能及冠脉循环的保护为优。     

In vitro effect of valepotriates isolated from Valeriana glechomifolia on rat P-type ATPases

Valepotriates are iridoids found in variable amounts in Valerianaceae and might be among the bioactive compounds which confer anxiolytic properties to the Valeriana species. On the other hand, unspecific cytotoxicity has also been described. Presently, however, no particular molecular target has been defined for these compounds. Here we studied the effect of valtrate, acevaltrate, and 1- β-acevaltrate isolated from Valeriana glechomifolia on the enzymatic activity of rat P-type ATPases. Valepotriates did not affect rat skeletal muscle sarco/endoplasmic reticulum Ca2?-ATPase (SERCA) activity at the highest concentration used (100?μM). In contrast, the same concentration inhibited roughly half of the total H?/K?-ATPase activity from rat gastric epithelium (valtrate 54.6?±?3.2?%, acevaltrate 60.7?±?7.3?%, 1- β-acevaltrate 50.2?±?3.1?%; mean ± SEM, n?=?3-5). Finally, these substances showed the highest inhibitory potency toward Na?/K?-ATPase, and the inhibition curves obtained provided a similar IC?? (in μM) for rat kidney α1 isoform (valtrate 21.2, acevaltrate 22.8, 1- β-acevaltrate 24.4) and brain hemispheres α2/ α3 isoforms (valtrate 19.4, acevaltrate 42.3, 1- β-acevaltrate 38.3). Our results suggest that P-type ATPases are differentially inhibited by valepotriates and that Na?/K?-ATPase might be one of their molecular targets in vivo.     

不同ACEI类药物对糖尿病大鼠心肌间质纤维化的影响

目的通过研究卡托普利、贝那普利、福辛普利对糖尿病大鼠心肌转化生长因子β1（TGF—β1）及基质金属蛋白酶（MMPs）的影响,探讨这3种药物对糖尿病大鼠心肌的抗纤维化作用。方法50只SD大鼠分为10只正常组,40只糖尿病组,糖尿病组链脲佐菌素注射建模。建模成功后将成功的糖尿病鼠（37只,未成功2只,死亡1只）随机分糖尿病组（n=9）、卡托普利治疗组（n=9）、贝拉普利治疗组（n=9）、福辛普利治疗组（n=10）,免疫组化法测Ⅰ、Ⅲ型胶原的表达,TGF-β1、基质金属蛋白酶特异性抑制物（TIMP—1）和MMP-1蛋白的表达。RT—PCR法测TIMP-1和MMP-1 mRNA的表达。结果糖尿病组心脏指数心室指数显著大于正常组（P〈0．05）,Ⅰ、Ⅲ型胶原的表达也增加（P〈0．05）,存在着心肌间质纤维化,胶原Ⅰ、胶原Ⅲ、TGF—β1、TIMP-1蛋白及TIMP-1 mRNA的表达增高（P〈0．05）,MMP—1蛋白及mRNA的表达减少（P〈0．05）。经过卡托普利、福辛普利、贝那普利后,上述各异常指标均有所改善。结论3组药物通过对TGF-β1和MMPs的影响可明显改善糖尿病心肌间质纤维化。卡托普利的疗效比贝那普利与福辛普利稍差,贝那普利与福辛普利之间无差异。     

Effect of cadmium chloride on rat brain synaptosomal ATPases

Cadmium has been shown to alter membrane-bound ATPases both in vitro and in rats treated with the metal. However, cadmium effects on the substrate and ionic activation kinetics of Na+-K+ ATPase activity were determined by a coupled enzymatic method. A concentration-response curve was determined using 5-30 microM cadmium chloride in the reaction medium. The data showed a 50% inhibition at 15 microM cadmium chloride. Cadmium effects on ATP, Na+ and K+ activation of Na+-K+ ATPase were determined by varying the concentration of these substrates at 15 microM cadmium chloride. The double-reciprocal plots showed that cadmium inhibition of Na+-K+ was competitive with ATP and Na+ in that the Km values were increased but not the Vmax values. In contrast, cadmium inhibition was noncompetitive with K+ activation where both Km and Vmax values were decreased. The present data suggest that cadmium may be competing with ATP and Na+ sites on Na+-K+ ATPase in rat brain synaptosomes.     

促红细胞生成素对小鼠心肌缺血损伤的心脏保护作用及机制

目的 探讨类似促红细胞生成素(EPO)对小鼠心肌缺血损伤的保护作用.方法 采用结扎冠状动脉前降支的方法建立大鼠心肌梗死模型.治疗组大鼠(n=40)采用腹腔注射方法给予EPO(1μg/kg),对照组大鼠(n=40)在相同的时间点给予等量的生理盐水.处理后24 h通过TCC染色测量心肌梗死面积,处理后3、24 h,通过Western-blot法检测STAT3蛋白表达.处理8周后,通过超声心动图测量左心室舒张期末容积、左心室收缩期末容积、左心室射血分数.结果 治疗组小鼠心肌梗死面积为24.6％,对照组小鼠心肌梗死面积为48.6％(P＜0.05);EPO干预后,与对照组比较,治疗组STAT3蛋白表达增高(P＜0.05);治疗组左心室舒张期末容积、左心室收缩期末容积、左心室射血分数分别为592μl、371μl、36％,对照组上述指标分别为740 μl、526 μl、27％,两组差异有统计学意义(P＜0.05).结论 EPO在小鼠心肌缺血损伤中具有心脏保护作用.