目的:探讨钠氢通道阻断剂HOE642对肺缺血再灌注损伤的保护作用,以及其保护作用与p38丝裂原活化蛋白激酶(p38 mitogen activated protein kinase,p38MAPK)通路的关系。方法:选取野生小鼠36只,随机分为假手术组(SHAM组)、肺缺血再灌注组(...目的:探讨钠氢通道阻断剂HOE642对肺缺血再灌注损伤的保护作用,以及其保护作用与p38丝裂原活化蛋白激酶(p38 mitogen activated protein kinase,p38MAPK)通路的关系。方法:选取野生小鼠36只,随机分为假手术组(SHAM组)、肺缺血再灌注组(I/R组)和肺缺血再灌注+HOE642组(HOE组),建立肺缺血再灌注损伤模型。测定肺组织含水量;光镜下观察肺组织病理学变化;ELISA检测炎症反应水平(IL-6,TNF-α);测定肺组织细胞内钙离子荧光强度;测定肺组织p38MAPK的蛋白表达。结果:HOE组肺组织含水量低于I/R组,但高于SHAM组(均P<0.05);HOE组肺组织间质水肿、出血、炎症细胞浸润的情况比I/R组明显减轻,但比SHAM组严重(均P<0.05);HOE组肺组织IL-6和TNF-α水平低于I/R组,但高于SHAM组(均P<0.05);HOE组细胞内钙离子荧光强度低于I/R组,但高于SHAM组(均P<0.05);HOE组肺组织p38MAPK的蛋白表达量低于I/R组,但高于SHAM组(均P<0.05)。结论:HOE642可能通过调节p38MAPK信号通路,降低细胞内的钙离子浓度和钙超载,减轻炎症反应而发挥肺保护作用。展开更多
To determine the effects of HOE 694, a new and potent Na＋- H＋ exchanger blocker, on transient inward current (Iti) and Na＋- Ca2＋ exchange during hypoxia- reoxygenation in guinea pig cardiomyocytes. Methods. Cardio...To determine the effects of HOE 694, a new and potent Na＋- H＋ exchanger blocker, on transient inward current (Iti) and Na＋- Ca2＋ exchange during hypoxia- reoxygenation in guinea pig cardiomyocytes. Methods. Cardiomyocytes were isolated from adult guinea pig ventricle. Experiment was performed in an experimental chamber that allowed the cells to be exposed to a sufficiently low O2 pressure. The cells were subjected to hypoxia and reoxygenation. The ionic currents were studied with patch clamp technique. Results. In the absence of HOE 694, hypoxia- reoxygenation induced Iti in 12 of 15 experiments; but in cardiomyocytes pretreated with HOE 694 (10～ 50μ mol/L), the incidence of Iti observed during reoxygenation was reduced to 5 of 11 experiments and 3 of 10 experiments, P Conclusions. Blockade of the Na＋- H＋ exchange by HOE 694 could reduce Ca2＋ overload upon hypoxia- reoxygenation, and inhibition of Na＋- H＋ exchange may also indirectly decrease Na＋- Ca2＋ exchange activity during hypoxia.展开更多
文摘目的:探讨钠氢通道阻断剂HOE642对肺缺血再灌注损伤的保护作用,以及其保护作用与p38丝裂原活化蛋白激酶(p38 mitogen activated protein kinase,p38MAPK)通路的关系。方法:选取野生小鼠36只,随机分为假手术组(SHAM组)、肺缺血再灌注组(I/R组)和肺缺血再灌注+HOE642组(HOE组),建立肺缺血再灌注损伤模型。测定肺组织含水量;光镜下观察肺组织病理学变化;ELISA检测炎症反应水平(IL-6,TNF-α);测定肺组织细胞内钙离子荧光强度;测定肺组织p38MAPK的蛋白表达。结果:HOE组肺组织含水量低于I/R组,但高于SHAM组(均P<0.05);HOE组肺组织间质水肿、出血、炎症细胞浸润的情况比I/R组明显减轻,但比SHAM组严重(均P<0.05);HOE组肺组织IL-6和TNF-α水平低于I/R组,但高于SHAM组(均P<0.05);HOE组细胞内钙离子荧光强度低于I/R组,但高于SHAM组(均P<0.05);HOE组肺组织p38MAPK的蛋白表达量低于I/R组,但高于SHAM组(均P<0.05)。结论:HOE642可能通过调节p38MAPK信号通路,降低细胞内的钙离子浓度和钙超载,减轻炎症反应而发挥肺保护作用。
基金This work was supported by Leading Specialty Funding of Shanghai, Grant No.94- III- 001.
文摘To determine the effects of HOE 694, a new and potent Na＋- H＋ exchanger blocker, on transient inward current (Iti) and Na＋- Ca2＋ exchange during hypoxia- reoxygenation in guinea pig cardiomyocytes. Methods. Cardiomyocytes were isolated from adult guinea pig ventricle. Experiment was performed in an experimental chamber that allowed the cells to be exposed to a sufficiently low O2 pressure. The cells were subjected to hypoxia and reoxygenation. The ionic currents were studied with patch clamp technique. Results. In the absence of HOE 694, hypoxia- reoxygenation induced Iti in 12 of 15 experiments; but in cardiomyocytes pretreated with HOE 694 (10～ 50μ mol/L), the incidence of Iti observed during reoxygenation was reduced to 5 of 11 experiments and 3 of 10 experiments, P Conclusions. Blockade of the Na＋- H＋ exchange by HOE 694 could reduce Ca2＋ overload upon hypoxia- reoxygenation, and inhibition of Na＋- H＋ exchange may also indirectly decrease Na＋- Ca2＋ exchange activity during hypoxia.
