目的阐明心肌结构重塑过程中能量代谢模式的转化特征。方法C57/BL6小鼠30只,20~30 g,雌雄各半,随机分为模型组和假手术组(n=15)。实验动物接受3%水合氯醛(3 ml/kg)腹腔注射麻醉,模型组动物无菌游离腹主动脉和下腔静脉,并吻合,建立心肌...目的阐明心肌结构重塑过程中能量代谢模式的转化特征。方法C57/BL6小鼠30只,20~30 g,雌雄各半,随机分为模型组和假手术组(n=15)。实验动物接受3%水合氯醛(3 ml/kg)腹腔注射麻醉,模型组动物无菌游离腹主动脉和下腔静脉,并吻合,建立心肌结构重构模型。分别采集不同组别实验动物心肌组织,检测不同途径能量代谢关键酶的蛋白表达水平,初步判断不同疾病阶段,心肌能量代谢模式。然后利用三磷酸腺苷(ATP)检测试剂盒测定不同组别心肌细胞ATP产量,并利用TUNEL方法测定不同组别心肌细胞凋亡水平差异。结果与假手术组相比,模型组实验动物在术后2周时脂肪酸β氧化途径关键酶肌型肉碱棕榈酰转移酶-I(MCPT-1)、中链脂酰辅酶a脱氢酶(MCAD)、过氧化物酶体增殖物激活受体a(PPARα),以及糖代谢关键酶丙酮酸激酶(PK)无明显变化。但在术后5周时,MCPT-1、MCAD、PPARα均表现出不同程度的下降,PK有升高趋势,但未达显著差异水平,但心肌组织ATP含量明显下降,心肌细胞凋亡指数(AI)显著升高。术后15周时,MCPT-1(MCPT-1 vs GAPDH:0.5 vs 0.85,P<0.05)和MCAD(MCAD vs GAPDH:0.6 vs 1.25,P<0.05)表达量显著下降,PPARα水平(PPARαvs GAPDH:0.4 vs 1.2,P<0.01)非常显著下降,而PK水平(PK vs GAPDH:0.53 vs 0.92,P<0.01)明显升高。心肌细胞ATP含量明显降低,心肌细胞凋亡指数明显升高。结论亚急性期和代偿期心肌细胞的代谢模式以脂肪酸β氧化为主,而在失代偿期脂肪酸beta氧化障碍,向糖酵解代谢模式转换,说明结构重塑心肌向胚胎型模式转变,这可能(至少部分)是心肌细胞产能能力下降及心肌细胞凋亡水平升高的原因。展开更多
Background Iron is a biocorrodible metal that might be used in bioabsorbable stents.This study investigated the effects at the cellular and protein levels of soluble divalent iron （ferrous gluconate） and soluble tri...Background Iron is a biocorrodible metal that might be used in bioabsorbable stents.This study investigated the effects at the cellular and protein levels of soluble divalent iron （ferrous gluconate） and soluble trivalent iron （ferric chloride） on the proliferation of human aortic smooth muscle cell （HASMC） in vitro.Methods The water-soluble tetrazolium （WST-1） test was used to evaluate the effect of iron on proliferation of HASMC and Western blotting was used to measure the levels of signaling proteins involved in proliferative and apoptosis pathways.Results HASMC proliferation was inhibited in a concentration dependent manner after treatment with soluble divalent and trivalent iron at concentrations of 100-500 μmol/L.Western blotting analysis showed that the proliferating cell nuclear antigen （PCNA） expression following treatment with soluble divalent iron and trivalent iron at 100,300 and 500 μmol/L was reduced compared to the control.The PCNA expression decreased with increasing iron concentration and to a greater extent with the trivalent iron than with the divalent iron treatment group.The p53 expression was markedly increased in a concentration dependent manner in both iron treatment groups.Conclusion The soluble divalent iron and,to a greater degree trivalent iron,inhibited HASMC proliferation in a dosedependent manner,which may be attributed to reduction of PCNA expression and increase of p53 expression.展开更多
文摘目的探讨沙滩椅体位下行肩关节手术后发生股外侧皮神经麻痹(lateral femoral cutaneous nerve palsy,LFCNP)的危险因素。方法回顾性分析254例沙滩椅体位下行肩关节手术患者的临床资料。根据患者术后是否发生LFCNP分为LFCNP组(8例)和非LFCNP组(246例),记录比较2组患者的人口统计学特征、美国麻醉医师协会(American Society of Anesthesiologists,ASA)分级、术前合并症(高血压史、2型糖尿病史)、麻醉方法、围术期输液量、尿量、出血量、手术时间。将单因素方差分析中差异有统计学意义的指标纳入二元Logistic回归,分析沙滩椅体位下行肩关节手术后发生LFCNP的危险因素。结果LFCNP组体重指数(body mass index,BMI)明显大于非LFCNP组,手术时间明显长于非LFCNP组,差异均有统计学意义(P<0.05)。2组性别、年龄、身高、体重、ASA分级、术前并发症(高血压史、2型糖尿病史)、麻醉方法、输注液量、尿量、失血量差异均无统计学意义(P>0.05)。Logistic回归分析结果显示,BMI>28和手术时间>2 h是沙滩椅体位下行肩关节手术后发生LFCNP的危险因素。结论BMI>28和手术时间>2 h是沙滩椅体位下行肩关节手术后发生LFCNP的危险因素。
文摘目的阐明心肌结构重塑过程中能量代谢模式的转化特征。方法C57/BL6小鼠30只,20~30 g,雌雄各半,随机分为模型组和假手术组(n=15)。实验动物接受3%水合氯醛(3 ml/kg)腹腔注射麻醉,模型组动物无菌游离腹主动脉和下腔静脉,并吻合,建立心肌结构重构模型。分别采集不同组别实验动物心肌组织,检测不同途径能量代谢关键酶的蛋白表达水平,初步判断不同疾病阶段,心肌能量代谢模式。然后利用三磷酸腺苷(ATP)检测试剂盒测定不同组别心肌细胞ATP产量,并利用TUNEL方法测定不同组别心肌细胞凋亡水平差异。结果与假手术组相比,模型组实验动物在术后2周时脂肪酸β氧化途径关键酶肌型肉碱棕榈酰转移酶-I(MCPT-1)、中链脂酰辅酶a脱氢酶(MCAD)、过氧化物酶体增殖物激活受体a(PPARα),以及糖代谢关键酶丙酮酸激酶(PK)无明显变化。但在术后5周时,MCPT-1、MCAD、PPARα均表现出不同程度的下降,PK有升高趋势,但未达显著差异水平,但心肌组织ATP含量明显下降,心肌细胞凋亡指数(AI)显著升高。术后15周时,MCPT-1(MCPT-1 vs GAPDH:0.5 vs 0.85,P<0.05)和MCAD(MCAD vs GAPDH:0.6 vs 1.25,P<0.05)表达量显著下降,PPARα水平(PPARαvs GAPDH:0.4 vs 1.2,P<0.01)非常显著下降,而PK水平(PK vs GAPDH:0.53 vs 0.92,P<0.01)明显升高。心肌细胞ATP含量明显降低,心肌细胞凋亡指数明显升高。结论亚急性期和代偿期心肌细胞的代谢模式以脂肪酸β氧化为主,而在失代偿期脂肪酸beta氧化障碍,向糖酵解代谢模式转换,说明结构重塑心肌向胚胎型模式转变,这可能(至少部分)是心肌细胞产能能力下降及心肌细胞凋亡水平升高的原因。
文摘Background Iron is a biocorrodible metal that might be used in bioabsorbable stents.This study investigated the effects at the cellular and protein levels of soluble divalent iron （ferrous gluconate） and soluble trivalent iron （ferric chloride） on the proliferation of human aortic smooth muscle cell （HASMC） in vitro.Methods The water-soluble tetrazolium （WST-1） test was used to evaluate the effect of iron on proliferation of HASMC and Western blotting was used to measure the levels of signaling proteins involved in proliferative and apoptosis pathways.Results HASMC proliferation was inhibited in a concentration dependent manner after treatment with soluble divalent and trivalent iron at concentrations of 100-500 μmol/L.Western blotting analysis showed that the proliferating cell nuclear antigen （PCNA） expression following treatment with soluble divalent iron and trivalent iron at 100,300 and 500 μmol/L was reduced compared to the control.The PCNA expression decreased with increasing iron concentration and to a greater extent with the trivalent iron than with the divalent iron treatment group.The p53 expression was markedly increased in a concentration dependent manner in both iron treatment groups.Conclusion The soluble divalent iron and,to a greater degree trivalent iron,inhibited HASMC proliferation in a dosedependent manner,which may be attributed to reduction of PCNA expression and increase of p53 expression.
