目的:探讨过氧化物酶体增殖物激活受体γ(RRAR-γ)激动剂罗格列酮干预Toll样受体4/磷脂酰肌醇3-激酶(TLR4/PI3K)信号通路对脂多糖(LPS)诱导人冠状动脉血管内皮细胞(HCAEC)缝隙连接蛋白43(Cx43)表达的影响。方法:用LPS诱导建立HCAEC炎症...目的:探讨过氧化物酶体增殖物激活受体γ(RRAR-γ)激动剂罗格列酮干预Toll样受体4/磷脂酰肌醇3-激酶(TLR4/PI3K)信号通路对脂多糖(LPS)诱导人冠状动脉血管内皮细胞(HCAEC)缝隙连接蛋白43(Cx43)表达的影响。方法:用LPS诱导建立HCAEC炎症模型,将细胞分为模型组、TLR4激动剂KLA组、PI3K抑制剂LY294002组、罗格列酮组、KLA+罗格列酮组、LY294002+罗格列酮组,另设空白组(不作任何处理)。分别采用实时荧光定量PCR(qPCR)、Western blotting法检测细胞中Cx43、TLR4、PI3K m RNA和蛋白表达。结果:KLA+罗格列酮组TLR4表达明显低于KLA组(P<0.05)。LY294002+罗格列酮组PI3K表达明显低于LY294002组(P<0.05)。模型组Cx43表达明显低于空白组(P<0.05),KLA+罗格列酮组Cx43表达明显高于KLA组(P<0.05),LY294002+罗格列酮组Cx43表达明显高于LY294002组(P<0.05)。结论:PPAR-γ激动剂罗格列酮可抑制TLR4/PI3K信号通路并上调HCAEC中Cx43的表达。展开更多
A novel user association model for heterogeneous network(Het Net) with dual connectivity(DC) and constrained backhaul is proposed in this paper, where not only the best combination of serving macro cell and small cell...A novel user association model for heterogeneous network(Het Net) with dual connectivity(DC) and constrained backhaul is proposed in this paper, where not only the best combination of serving macro cell and small cell for each user to associate is selected but also the optimal traffi c split between the macro cell and small cell is determined to enhance both radio resource effi ciency and backhaul capacity utilization. To solve this optimization problem, an intuitive algorithm based on iteratively solving two sub-problems is proposed. One sub-problem is a binary integer programming problem and a corresponding greedy algorithm is proposed, while the other sub-problem is a simple linear programming problem and can be easily solved. Numerical results show that the proposed model and algorithm can achieve better radio resource effi ciency and backhaul capacity utilization compared with user association in Het Net without DC, which validate the capacity enhancement potentials of radio resource coordination in Het Net with DC.展开更多
Background Percutaneous coronary intervention （PCI） is a well-established method for managing coronary diseases. However, the increasing use of PCI has led to an increased incidence of acute cerebrovascular acciden...Background Percutaneous coronary intervention （PCI） is a well-established method for managing coronary diseases. However, the increasing use of PCI has led to an increased incidence of acute cerebrovascular accidents （CVA） related to PCI. In this study, we investigated the characteristics and risk factors of CVA after PCI in patients with known stroke history. Methods Between January 1, 2005 and March 1, 2009, 621 patients with a history of stroke underwent a total of 665 PCI procedures and were included in this retrospective study. Demographic and clinical characteristics, previous medications, procedures, neurologic deficits, location of lesion and in-hospital clinical outcomes of patients who developed a CVA after the cardiac catheterization laboratory visit and before discharge were reviewed. Results Acute CVA was diagnosed in 53 （8.5%） patients during the operation or the perioperative period. Seventeen patients suffered from transient ischemic attack, thirty-four patients suffered from cerebral infarction and two patients suffered from cerebral hemorrhage. The risk factors for CVA after PCI in stroke patients were： admission with an acute coronary syndrome, use of an intra-aortic balloon pump, urgent or emergency procedures, diabetes mellitus, and poor left ventricular systolic function, arterial fibrillation, previous myocardial infarction, dyslipidemia, tobacco use, and no/irregular use of anti-platelet medications. Conclusions The incidence of CVA during and after PCI in patients with history of stroke is much higher than that in patients without history of stroke. Patients with atrial fibrillation, previous myocardial infarction, diabetes mellitus, dyslipidemia, tobacco use, and no or irregular use of anti-platelet medications were at higher risk for recurrent stroke. This study showed a strong association between acute coronary svndromes and in-hospital stroke after PCI.展开更多
文摘目的:探讨过氧化物酶体增殖物激活受体γ(RRAR-γ)激动剂罗格列酮干预Toll样受体4/磷脂酰肌醇3-激酶(TLR4/PI3K)信号通路对脂多糖(LPS)诱导人冠状动脉血管内皮细胞(HCAEC)缝隙连接蛋白43(Cx43)表达的影响。方法:用LPS诱导建立HCAEC炎症模型,将细胞分为模型组、TLR4激动剂KLA组、PI3K抑制剂LY294002组、罗格列酮组、KLA+罗格列酮组、LY294002+罗格列酮组,另设空白组(不作任何处理)。分别采用实时荧光定量PCR(qPCR)、Western blotting法检测细胞中Cx43、TLR4、PI3K m RNA和蛋白表达。结果:KLA+罗格列酮组TLR4表达明显低于KLA组(P<0.05)。LY294002+罗格列酮组PI3K表达明显低于LY294002组(P<0.05)。模型组Cx43表达明显低于空白组(P<0.05),KLA+罗格列酮组Cx43表达明显高于KLA组(P<0.05),LY294002+罗格列酮组Cx43表达明显高于LY294002组(P<0.05)。结论:PPAR-γ激动剂罗格列酮可抑制TLR4/PI3K信号通路并上调HCAEC中Cx43的表达。
基金supported by the National High Technical Research and Development Program of China(863 program)(No.2015AA01A705)
文摘A novel user association model for heterogeneous network(Het Net) with dual connectivity(DC) and constrained backhaul is proposed in this paper, where not only the best combination of serving macro cell and small cell for each user to associate is selected but also the optimal traffi c split between the macro cell and small cell is determined to enhance both radio resource effi ciency and backhaul capacity utilization. To solve this optimization problem, an intuitive algorithm based on iteratively solving two sub-problems is proposed. One sub-problem is a binary integer programming problem and a corresponding greedy algorithm is proposed, while the other sub-problem is a simple linear programming problem and can be easily solved. Numerical results show that the proposed model and algorithm can achieve better radio resource effi ciency and backhaul capacity utilization compared with user association in Het Net without DC, which validate the capacity enhancement potentials of radio resource coordination in Het Net with DC.
文摘Background Percutaneous coronary intervention （PCI） is a well-established method for managing coronary diseases. However, the increasing use of PCI has led to an increased incidence of acute cerebrovascular accidents （CVA） related to PCI. In this study, we investigated the characteristics and risk factors of CVA after PCI in patients with known stroke history. Methods Between January 1, 2005 and March 1, 2009, 621 patients with a history of stroke underwent a total of 665 PCI procedures and were included in this retrospective study. Demographic and clinical characteristics, previous medications, procedures, neurologic deficits, location of lesion and in-hospital clinical outcomes of patients who developed a CVA after the cardiac catheterization laboratory visit and before discharge were reviewed. Results Acute CVA was diagnosed in 53 （8.5%） patients during the operation or the perioperative period. Seventeen patients suffered from transient ischemic attack, thirty-four patients suffered from cerebral infarction and two patients suffered from cerebral hemorrhage. The risk factors for CVA after PCI in stroke patients were： admission with an acute coronary syndrome, use of an intra-aortic balloon pump, urgent or emergency procedures, diabetes mellitus, and poor left ventricular systolic function, arterial fibrillation, previous myocardial infarction, dyslipidemia, tobacco use, and no/irregular use of anti-platelet medications. Conclusions The incidence of CVA during and after PCI in patients with history of stroke is much higher than that in patients without history of stroke. Patients with atrial fibrillation, previous myocardial infarction, diabetes mellitus, dyslipidemia, tobacco use, and no or irregular use of anti-platelet medications were at higher risk for recurrent stroke. This study showed a strong association between acute coronary svndromes and in-hospital stroke after PCI.
