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【目的】 观察转化生长因子β1(TGF-β1)对大鼠肾小管上皮细胞单核细胞趋化因子-1(MCP-1)及白细胞介素-6 (IL-6) 表达的影响,并探讨NADPH氧化酶在其中的作用?【方法】 以大鼠肾小管上皮细胞株(NRK-52E)为研究对象,采用TGF-β1(10 ng/mL)刺激0 h, 2 h, 4 h, 8 h, 12 h, 24 h分别收取RNA;刺激0 h, 12 h, 24 h,48 h, 72 h分别收取细胞上清液;部分实验中培养的细胞在刺激前用NADPH氧化酶抑制剂DPI (0.1, 1, 5, 10 μmol/L)预处理1 h, 然后含10 ng的TGF-β1无血清DMEM/F12培养液分别培养12 h (收集RNA)和24 h (收集细胞上清液)?所有实验重复3次?细胞内活性氧(ROS)的产生采用激光共聚焦显微镜观察?NADPH氧化酶p22phox?gp91phox?p47phox和 p67phox亚单位以及MCP-1和IL-6 mRNA的表达采用RT-PCR检测?细胞上清液中MCP-1的含量采用ELISA检测?【结果】 TGF-β1可显著上调NADPH氧化酶p67phox亚单位mRNA的表达, 8 h为对照的2.43倍 (P < 0.01),24 h达3.59倍(P < 0.01)?但对p22phox?gp91phox和p47phox亚单位mRNA表达无显著影响?TGF-β1可显著增加细胞内ROS产生, DPI预处理后ROS产生较TGF-β1刺激组降低了43.69% (P < 0.05)? TGF-β1可显著上调MCP-1和IL-6 mRNA及蛋白的表达?DPI预处理可明显逆转TGF-β1诱导的MCP-1和IL-6的上调表达?【结论】 TGF-β1可促使细胞ROS产生增加?TGF-β1可能通过NADPH氧化酶依赖的ROS介导了大鼠肾小管上皮细胞MCP-1及IL-6的上调表达?

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Graphene and hexagonal boron nitride (h-BN) are isoelectronic materials. Depite their similar structures, they exhibit stark differences in electrical conductivities. Graphene is an excellent conductivity, while h-BN is an insulator. Based on the quantum chemistry calculations, the electronic structures of model molecules, C24H12 and B12N12H12, have been studied by the topological analysis of electron density, natural bond orbital analysis, nucleusindependent chemical shift, and magnetic induced current density analysis. The study provides theoretical explanations for the conductivity differences between graphene and h-BN. These findings can enhance students' understanding of the fundametal concepts such as isoelectronic species, localization and delocalized π bond. [ABSTRACT FROM AUTHOR]

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