目的:研究扩心方对阿霉素诱导扩张型心肌病模型大鼠心功能、心肌损伤的保护作用,探讨扩心方作用机制。方法:50只Wistar大鼠腹腔注射阿霉素6周建立DCM模型,开始造模4周后随机分为模型组,扩心方高、中、低剂量组,卡托普利组(每组各10只),...目的:研究扩心方对阿霉素诱导扩张型心肌病模型大鼠心功能、心肌损伤的保护作用,探讨扩心方作用机制。方法:50只Wistar大鼠腹腔注射阿霉素6周建立DCM模型,开始造模4周后随机分为模型组,扩心方高、中、低剂量组,卡托普利组(每组各10只),连续灌胃给药四周,另设10只正常对照。正常组和模型组以生理盐水灌胃。治疗结束后,对各组大鼠进行心脏超声检查,病理形态学检测,以及用反转录-聚合酶链反应和蛋白质免疫印迹法分别检测心肌组织中SERCA2α、PLB的m RNA和蛋白含量。结果:与正常对照组相比,模型组心功能减弱,出现心肌病理损害,SERCA2α与PLB表达异常;与模型组相比,扩心方组可以改善DCM大鼠的心功能、心肌病理学形态,同时,提高SERCA2αm RNA和蛋白表达、抑制PLB m RNA和蛋白表达。结论:扩心方能提高DCM大鼠的左心室射血分数和缩短率,减轻心肌损伤,改善心功能,同时调控DCM大鼠SERCA2α、PLB的表达。提示扩心方改善DCM大鼠心功能的作用机制,可能与纠正心肌肌浆网钙调控相关蛋白-SERCA2α、PLB的异常表达相关。展开更多
Background： Disrupted Ca2＋ homeostasis contributes to the development of colonic dysmotility in ulcerative colitis （UC）, but the underlying mechanisms are unknown. This study aimed to examine the alteration of col...Background： Disrupted Ca2＋ homeostasis contributes to the development of colonic dysmotility in ulcerative colitis （UC）, but the underlying mechanisms are unknown. This study aimed to examine the alteration of colonic smooth muscle （SM） Ca2＋ signaling and Ca2＋ handling proteins in a rat model of dextran sulfate sodium （DSS）-induced UC. Methods： Male Sprague-Dawley rats were randomly divided into control （n = 18） and DSS （n = 17） groups. Acute colitis was induced by 5% DSS in the drinking water for 7 days. Contractility of colonic SM strips （controls, n = 8 and DSS, n = 7） was measured in an organ bath. Cytosolic resting Ca2＋ levels （n = 3 in each group） and Ca2＋ transients （n = 3 in each group） were measured in single colonic SM cells. Ca2＋ handling protein expression was determined by Western blotting （n = 4 in each group）. Differences between control and DSS groups were analyzed by a two-sample independent t-test. Results： Average tension and amplitude of spontaneous contractions of colonic muscle strips were significantly enhanced in DSS-treated rats compared with controls （1.25 ± 0.08 g vs. 0.96 - 0.05 g, P = 0.007; and 2.67 - 0.62 g vs. 0.52 ±0.10 g, P= 0.013）. Average tensions of carbachol-evoked contractions were much weaker in the DSS group （1.08 ±0.10 g vs. 1.80 ±0.19 g, P = 0.006）. Spontaneous Ca2＋ transients were observed in more SM cells from DSS-treated rats （15/30 cells） than from controls （5/36 cells）. Peak caffeine-induced intracellular Ca2＋ release was lower in SM cells of DSS-treated rats than controls （0.413 ±0.046 vs. 0.548 ±0.041, P = 0.033）. Finally, several Ca2＋ handling proteins in colonic SM were altered by DSS treatment, including sarcoplasmic reticulum calcium-transporting ATPase 2a downregulation and phospholamban and inositol 1,4,5-trisphosphate receptor 1 upregulation. Conclusions： Impaired intracellular Ca2＋ signaling of colonic SM, caused by alteration of Ca2＋ handing proteins, contribute to展开更多
Objective To study the effect of phospholamban antisense RNA （asPLB） on sarcoplasmic reticulum Ca2＋-ATPase activity and cardiac function in rats with diabetes mellitus （DM） mediated by recombinant adeno-associate...Objective To study the effect of phospholamban antisense RNA （asPLB） on sarcoplasmic reticulum Ca2＋-ATPase activity and cardiac function in rats with diabetes mellitus （DM） mediated by recombinant adeno-associated virus （rAAV） vector. Methods Six weeks after the induction of DM by streptozotocin injected intraperitoneally, the rats were divided into three groups, namely： DM-rAAV-asPLB group, DM-saline group and DM group （control group）. The rats in the DM-rAAV-asPLB group were intramyocardially injected with rAAV-asPLB, the rats in the DM-saline group were injected with saline, and those in the control group did not receive any treatment. Six weeks after gene transfer, the expressions of PLB protein and PLB phosphorylation were detected by Western-blot, while the activity of sarcoplasmic reticulum （SR） Ca2＋-ATPase and left ventricular function were measured. Results The PLB protein expression level was significantly higher whereas the PLB phosphorylation, SR Ca2＋-ATPase activity and left ventricular function were significantly lower in the DM-saline group than in the control group. No significant difference was found in PLB protein expression level, PLB phosphorylation or SR Ca2＋-ATPase activity between the DM-rAAV-asPLB group and the control group. The left ventricular function in the DM-rAAV-asPLB group was poorer than in the control group and was better than in the DM-saline group. Conclusion rAAV-asPLB can down-regulate PLB protein expression and up-regulate phosphorylation and SR Ca2＋-ATPase activity, thus contributing to the improvement of in vivo ventricutar function. PLB left展开更多
文摘目的:研究扩心方对阿霉素诱导扩张型心肌病模型大鼠心功能、心肌损伤的保护作用,探讨扩心方作用机制。方法:50只Wistar大鼠腹腔注射阿霉素6周建立DCM模型,开始造模4周后随机分为模型组,扩心方高、中、低剂量组,卡托普利组(每组各10只),连续灌胃给药四周,另设10只正常对照。正常组和模型组以生理盐水灌胃。治疗结束后,对各组大鼠进行心脏超声检查,病理形态学检测,以及用反转录-聚合酶链反应和蛋白质免疫印迹法分别检测心肌组织中SERCA2α、PLB的m RNA和蛋白含量。结果:与正常对照组相比,模型组心功能减弱,出现心肌病理损害,SERCA2α与PLB表达异常;与模型组相比,扩心方组可以改善DCM大鼠的心功能、心肌病理学形态,同时,提高SERCA2αm RNA和蛋白表达、抑制PLB m RNA和蛋白表达。结论:扩心方能提高DCM大鼠的左心室射血分数和缩短率,减轻心肌损伤,改善心功能,同时调控DCM大鼠SERCA2α、PLB的表达。提示扩心方改善DCM大鼠心功能的作用机制,可能与纠正心肌肌浆网钙调控相关蛋白-SERCA2α、PLB的异常表达相关。
文摘Background： Disrupted Ca2＋ homeostasis contributes to the development of colonic dysmotility in ulcerative colitis （UC）, but the underlying mechanisms are unknown. This study aimed to examine the alteration of colonic smooth muscle （SM） Ca2＋ signaling and Ca2＋ handling proteins in a rat model of dextran sulfate sodium （DSS）-induced UC. Methods： Male Sprague-Dawley rats were randomly divided into control （n = 18） and DSS （n = 17） groups. Acute colitis was induced by 5% DSS in the drinking water for 7 days. Contractility of colonic SM strips （controls, n = 8 and DSS, n = 7） was measured in an organ bath. Cytosolic resting Ca2＋ levels （n = 3 in each group） and Ca2＋ transients （n = 3 in each group） were measured in single colonic SM cells. Ca2＋ handling protein expression was determined by Western blotting （n = 4 in each group）. Differences between control and DSS groups were analyzed by a two-sample independent t-test. Results： Average tension and amplitude of spontaneous contractions of colonic muscle strips were significantly enhanced in DSS-treated rats compared with controls （1.25 ± 0.08 g vs. 0.96 - 0.05 g, P = 0.007; and 2.67 - 0.62 g vs. 0.52 ±0.10 g, P= 0.013）. Average tensions of carbachol-evoked contractions were much weaker in the DSS group （1.08 ±0.10 g vs. 1.80 ±0.19 g, P = 0.006）. Spontaneous Ca2＋ transients were observed in more SM cells from DSS-treated rats （15/30 cells） than from controls （5/36 cells）. Peak caffeine-induced intracellular Ca2＋ release was lower in SM cells of DSS-treated rats than controls （0.413 ±0.046 vs. 0.548 ±0.041, P = 0.033）. Finally, several Ca2＋ handling proteins in colonic SM were altered by DSS treatment, including sarcoplasmic reticulum calcium-transporting ATPase 2a downregulation and phospholamban and inositol 1,4,5-trisphosphate receptor 1 upregulation. Conclusions： Impaired intracellular Ca2＋ signaling of colonic SM, caused by alteration of Ca2＋ handing proteins, contribute to
基金supported by Scientific Research Foundation of College of Medicine,Zhejiang UniversityFoundation of Zhejiang Science and Technology Bureau(No.2007B071)+1 种基金Foundation of Zhejiang Educational Committee(No.Y200908338)Foundation of Zhejiang Traditional Chinese Medicine Committee(No.2011B503103)
文摘Objective To study the effect of phospholamban antisense RNA （asPLB） on sarcoplasmic reticulum Ca2＋-ATPase activity and cardiac function in rats with diabetes mellitus （DM） mediated by recombinant adeno-associated virus （rAAV） vector. Methods Six weeks after the induction of DM by streptozotocin injected intraperitoneally, the rats were divided into three groups, namely： DM-rAAV-asPLB group, DM-saline group and DM group （control group）. The rats in the DM-rAAV-asPLB group were intramyocardially injected with rAAV-asPLB, the rats in the DM-saline group were injected with saline, and those in the control group did not receive any treatment. Six weeks after gene transfer, the expressions of PLB protein and PLB phosphorylation were detected by Western-blot, while the activity of sarcoplasmic reticulum （SR） Ca2＋-ATPase and left ventricular function were measured. Results The PLB protein expression level was significantly higher whereas the PLB phosphorylation, SR Ca2＋-ATPase activity and left ventricular function were significantly lower in the DM-saline group than in the control group. No significant difference was found in PLB protein expression level, PLB phosphorylation or SR Ca2＋-ATPase activity between the DM-rAAV-asPLB group and the control group. The left ventricular function in the DM-rAAV-asPLB group was poorer than in the control group and was better than in the DM-saline group. Conclusion rAAV-asPLB can down-regulate PLB protein expression and up-regulate phosphorylation and SR Ca2＋-ATPase activity, thus contributing to the improvement of in vivo ventricutar function. PLB left
