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高血压性心脏病左心室重构进展中的组织蛋白酶S基因表达及其活性变化的临床意义
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[1] 日本名古屋大学医学部循环器内科 延边大学医院心血管内科
[2] 日本名古屋大学医学部循环器内科
[3] 延边大学医院手术室
[4] 延边大学医院心血管内科
来源:
关键词:
高血压;
组织蛋白酶类;
心室重构;
D O I:
暂无
中图分类号:
R686 [筋腱、韧带、滑囊疾病及损伤];
学科分类号:
100220 [骨科学];
摘要:
目的探讨组织蛋白酶 S(Cathepsin S,Cat S)在高血压性心脏病心室重构发生发展中的表达及其活性动态变化与心功能的关系。方法 7周龄雄性 Dahl 盐敏感(DS)大鼠分别给予高负荷食盐(8%)或正常负荷食盐(0.3%)为12周和19周建立心肌肥厚(H-LVF)模型,心力衰竭模型(H-HF)及同龄对照组(12W-C 和19W-C)。另设人体心肌生检标本作研究对象(高血压代偿性心肌肥厚患者7例,心力衰竭患者18例和正常对照6例)。RT-PCR 和免疫组化分别检测 Cat S mRNA 及蛋白表达,酶谱法测定大鼠心肌组织中的 Cat S 活性,免疫印迹杂交检测心肌组织中的白介素1β蛋白表达,细胞荧光染色法检测培养心肌细胞 Cat S 的表达,心脏石蜡切片苦味酸-酸性品红染色法和van Gieson’s染色法分析胶原蛋白和弹性蛋白含量,心脏超声和血流动力学测定心功能和心室重构。结果 H-HF 组大鼠和患者心肌中的 Cat S mRNAs 的表达显著高于19W-C 组和 H-LVF 组大鼠和人(P<0.01)。免疫组化法和 in situ 法分析显示增高的 Cat SmRNA 和蛋白主要表达于心肌细胞。H-HF 组大鼠心肌的弹性蛋白分解能也显著高于19W-C(4.1倍)。H-LVF 大鼠心肌间质弹性蛋白含量明显增加,而在 H-HF 大鼠则下降低于对照组水平。H-HF 组心肌白介素 IL1β蛋白含量显著高于19W-C。IL1β刺激心肌细胞的 Cat S 蛋白表达。心肌中的弹性蛋白酶表达与左心室射血分数呈显著负相关(r=-0.88,P<0.05)。结论 Cat S 参与心室病理改变,是导致间质改变、心功能异常的主要因素之一,提示心肌 Cat S 在 H-HF 时心室重构发展中起重要作用。
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