目的对中风后遗症气虚血瘀大鼠模型脑组织和血清钠、钾、钙、镁离子含量及脑组织和红细胞膜上钠、钾、钙、镁、钙镁 ATP 酶活性进行研究。方法建立中风后遗症气虚血瘀大鼠模型,采用原子分光光度计法测定大鼠模型脑组织和血清钠、钾、钙...目的对中风后遗症气虚血瘀大鼠模型脑组织和血清钠、钾、钙、镁离子含量及脑组织和红细胞膜上钠、钾、钙、镁、钙镁 ATP 酶活性进行研究。方法建立中风后遗症气虚血瘀大鼠模型,采用原子分光光度计法测定大鼠模型脑组织和血清钠、钾、钙、镁离子含量,采用定磷法测定脑组织和红细胞膜上钠钾、钙、镁、钙镁 ATP 酶活性。结果刺激组符合中医“气虚血瘀”证候。刺激组脑组织钠离子显著高于正常组和非刺激组(P<0.01);而血钠显著低于正常组、非刺激组(P<0.05,P<0.01),血钾显著低于非刺激组(P<0.01),血钙、血镁显著低于正常组(P<0.05,P<0.01);脑组织镁 ATP 酶显著高于正常组(P<0.05),红细胞钙 ATP 酶显著低于正常组和非刺激组(P<0.05),红细胞镁、钙镁 ATP 酶显著低于正常组(P<0.05)。结论能量代谢障碍和血液中离子紊乱可能是中风后遗症“气虚血瘀”大鼠模型形成的部分原因。展开更多
Objective: To investigate the effects of seawater immersion on the function of myocardium and hepatocyte mitochondria in experimental hemorrhagic shock rats. Methods: Twenty-four male Wistar rats were divided into thr...Objective: To investigate the effects of seawater immersion on the function of myocardium and hepatocyte mitochondria in experimental hemorrhagic shock rats. Methods: Twenty-four male Wistar rats were divided into three groups (n=8 in each group): control group, HSL group (hemorrhagic shock group on land) and HSS group (hemorrhagic shock group in seawater). The hemodynamic parameters, activities of H+-ATPase (adenosinetriphosphatase), succinate dehydrogenase (SDH) and Ca 2+-Mg 2+-ATPase, the calcium contents in myocardium and hepatocyte mitochondria were measured and the changes of proton translocation across the inner mitochondrial membrane were analyzed. Results: The hemodynamic indexes and the activities of H+-ATPase, SDH, Ca 2+-Mg 2+-ATPase in HSS group were significantly lower than those in control group and HSL group (P< 0.05). In HSS group the calcium levels in tissue and mitochondria of myocardium and hepatocyte were elevated significantly compared with control group and HSL group(P< 0.05). There was no significant difference in proton translocation among three groups. Conclusions: This investigation demonstrates that seawater immersion can aggravate the conditions of hemorrhagic shock rats.展开更多
Objective To test whether in the absence of actin, actin-binding proteins such as caldesmon, calponin, and tropomyosin interact with the myosin of unphosphorylation, Ca 2+ -dependent phosphorylation (CDP), and Ca 2+ -...Objective To test whether in the absence of actin, actin-binding proteins such as caldesmon, calponin, and tropomyosin interact with the myosin of unphosphorylation, Ca 2+ -dependent phosphorylation (CDP), and Ca 2+ -independent phosphorylati-on (CIP) and stimulate myosin Mg 2+ -ATPase activities. Methods Mg 2+ -ATPase activities were measured to evaluate the effects of caldesmon, calponin, and tropomyosin on the myosin in unphosphorylation, CDP by myosin light chain kinase (MLCK), and CIP by MLCK. Results (1) At different incubation-time, i.e., 5, 10, 20, 40, and 60 minutes, the highest Mg 2+ -ATPase activity was ob-served when myosin was in the state of CDP, the medium was CIP of myosin, and the lowest was the unphosphorylated myosin. (2) In the absence of caldesmon, calponin, and tropomyosin, the Mg 2+ -ATPase activities from high to low were in the following order: CDP, CIP, and unphosphorylated myosin. However, in the presence of caldesmon, calponin, and tropo-myosin, the order of relative value of Mg 2+ -ATPase activities from high to low was unphosphorylated, CIP, and CDP of myosin respectively compared to the corresponding controls. Conclusions The results propose that caldesmon, calponin, and tropomyosin are capable of stimulating Mg 2+ -ATPase activity of smooth muscle myosin in Ca 2+ -independent manner, since Ca 2+ is not obligating for the stimulating effects of the three proteins. The common characteristic of the three proteins is that when myosin activities are low, their activations are relatively strong and this property might be involved in smooth muscle tension keeping.展开更多
文摘目的对中风后遗症气虚血瘀大鼠模型脑组织和血清钠、钾、钙、镁离子含量及脑组织和红细胞膜上钠、钾、钙、镁、钙镁 ATP 酶活性进行研究。方法建立中风后遗症气虚血瘀大鼠模型,采用原子分光光度计法测定大鼠模型脑组织和血清钠、钾、钙、镁离子含量,采用定磷法测定脑组织和红细胞膜上钠钾、钙、镁、钙镁 ATP 酶活性。结果刺激组符合中医“气虚血瘀”证候。刺激组脑组织钠离子显著高于正常组和非刺激组(P<0.01);而血钠显著低于正常组、非刺激组(P<0.05,P<0.01),血钾显著低于非刺激组(P<0.01),血钙、血镁显著低于正常组(P<0.05,P<0.01);脑组织镁 ATP 酶显著高于正常组(P<0.05),红细胞钙 ATP 酶显著低于正常组和非刺激组(P<0.05),红细胞镁、钙镁 ATP 酶显著低于正常组(P<0.05)。结论能量代谢障碍和血液中离子紊乱可能是中风后遗症“气虚血瘀”大鼠模型形成的部分原因。
文摘Objective: To investigate the effects of seawater immersion on the function of myocardium and hepatocyte mitochondria in experimental hemorrhagic shock rats. Methods: Twenty-four male Wistar rats were divided into three groups (n=8 in each group): control group, HSL group (hemorrhagic shock group on land) and HSS group (hemorrhagic shock group in seawater). The hemodynamic parameters, activities of H+-ATPase (adenosinetriphosphatase), succinate dehydrogenase (SDH) and Ca 2+-Mg 2+-ATPase, the calcium contents in myocardium and hepatocyte mitochondria were measured and the changes of proton translocation across the inner mitochondrial membrane were analyzed. Results: The hemodynamic indexes and the activities of H+-ATPase, SDH, Ca 2+-Mg 2+-ATPase in HSS group were significantly lower than those in control group and HSL group (P< 0.05). In HSS group the calcium levels in tissue and mitochondria of myocardium and hepatocyte were elevated significantly compared with control group and HSL group(P< 0.05). There was no significant difference in proton translocation among three groups. Conclusions: This investigation demonstrates that seawater immersion can aggravate the conditions of hemorrhagic shock rats.
基金Supported by the National Natural Science Foundation of China ( 30070203).
文摘Objective To test whether in the absence of actin, actin-binding proteins such as caldesmon, calponin, and tropomyosin interact with the myosin of unphosphorylation, Ca 2+ -dependent phosphorylation (CDP), and Ca 2+ -independent phosphorylati-on (CIP) and stimulate myosin Mg 2+ -ATPase activities. Methods Mg 2+ -ATPase activities were measured to evaluate the effects of caldesmon, calponin, and tropomyosin on the myosin in unphosphorylation, CDP by myosin light chain kinase (MLCK), and CIP by MLCK. Results (1) At different incubation-time, i.e., 5, 10, 20, 40, and 60 minutes, the highest Mg 2+ -ATPase activity was ob-served when myosin was in the state of CDP, the medium was CIP of myosin, and the lowest was the unphosphorylated myosin. (2) In the absence of caldesmon, calponin, and tropomyosin, the Mg 2+ -ATPase activities from high to low were in the following order: CDP, CIP, and unphosphorylated myosin. However, in the presence of caldesmon, calponin, and tropo-myosin, the order of relative value of Mg 2+ -ATPase activities from high to low was unphosphorylated, CIP, and CDP of myosin respectively compared to the corresponding controls. Conclusions The results propose that caldesmon, calponin, and tropomyosin are capable of stimulating Mg 2+ -ATPase activity of smooth muscle myosin in Ca 2+ -independent manner, since Ca 2+ is not obligating for the stimulating effects of the three proteins. The common characteristic of the three proteins is that when myosin activities are low, their activations are relatively strong and this property might be involved in smooth muscle tension keeping.
