目的:探讨同型半胱氨酸(Hcy)促进单核细胞趋化蛋白-1(MCP-1)表达诱导巨噬细胞浸润加重急性缺血性卒中(AIS)的机制。方法:采用线栓法制备局灶性脑缺血再灌注小鼠模型。采用2,3,5-氯化三苯基四氮唑(TTC)染色法检测脑缺血严重程度,HE染色...目的:探讨同型半胱氨酸(Hcy)促进单核细胞趋化蛋白-1(MCP-1)表达诱导巨噬细胞浸润加重急性缺血性卒中(AIS)的机制。方法:采用线栓法制备局灶性脑缺血再灌注小鼠模型。采用2,3,5-氯化三苯基四氮唑(TTC)染色法检测脑缺血严重程度,HE染色法检测缺血脑组织神经细胞损伤状况和炎症细胞浸润程度;高效液相色谱法检测急性期小鼠脑组织Hcy表达;免疫组织化学染色、Western blot、real time RT-PCR法检测小鼠脑组织MCP-1表达。Transwell小室检测巨噬细胞迁移程度,TUNEL法检测Hcy对内皮细胞影响;利用MCP-1中和抗体观察对巨噬细胞迁移的影响。结果:与假手术组比较,模型组小鼠右侧大脑半球梗死明显,缺血脑组织损伤严重,神经细胞死亡并伴有大量炎症细胞浸润;Hcy水平显著升高,MCP-1蛋白和mRNA表达均明显增加。Hcy刺激小鼠脑血管内皮细胞后可诱导NF-κB(p65)入核,促进巨噬细胞迁移,促进内皮细胞凋亡,给予NF-κB(p65)抑制剂后MCP-1生成减少;MCP-1中和抗体明显抑制巨噬细胞迁移。结论:Hcy、MCP-1与脑缺血再灌注炎性反应相关,且Hcy可能通过NF-κB通路促进MCP-1表达,发挥诱导巨噬细胞浸润作用,加重脑缺血损伤。展开更多
A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electroc...A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electrocatalytic activity for the oxidation of L-cysteine. The currents(measured by different pulse voltammetric techniques) increase linearly with the increase of the concentration of L-cysteine in the range from 1×10 -6 to 2×10 -3 mol/L. The detection limit is 2×10 -7 mol/L. The modified electrode has the best properties of the two components of the system, such as the electrocatalytic properties of carbon nanotubes and the molecular recognition and accumulation abilities of α-cyclodextrin. The result demonstrates that it has a good stability and reproducibility and is available in the detection of L-cysteine in urine.展开更多
文摘目的:探讨同型半胱氨酸(Hcy)促进单核细胞趋化蛋白-1(MCP-1)表达诱导巨噬细胞浸润加重急性缺血性卒中(AIS)的机制。方法:采用线栓法制备局灶性脑缺血再灌注小鼠模型。采用2,3,5-氯化三苯基四氮唑(TTC)染色法检测脑缺血严重程度,HE染色法检测缺血脑组织神经细胞损伤状况和炎症细胞浸润程度;高效液相色谱法检测急性期小鼠脑组织Hcy表达;免疫组织化学染色、Western blot、real time RT-PCR法检测小鼠脑组织MCP-1表达。Transwell小室检测巨噬细胞迁移程度,TUNEL法检测Hcy对内皮细胞影响;利用MCP-1中和抗体观察对巨噬细胞迁移的影响。结果:与假手术组比较,模型组小鼠右侧大脑半球梗死明显,缺血脑组织损伤严重,神经细胞死亡并伴有大量炎症细胞浸润;Hcy水平显著升高,MCP-1蛋白和mRNA表达均明显增加。Hcy刺激小鼠脑血管内皮细胞后可诱导NF-κB(p65)入核,促进巨噬细胞迁移,促进内皮细胞凋亡,给予NF-κB(p65)抑制剂后MCP-1生成减少;MCP-1中和抗体明显抑制巨噬细胞迁移。结论:Hcy、MCP-1与脑缺血再灌注炎性反应相关,且Hcy可能通过NF-κB通路促进MCP-1表达,发挥诱导巨噬细胞浸润作用,加重脑缺血损伤。
文摘A novel modified electrode was constructed by casting α-cyclodextrin-incorporated carbon nanotubes on graphite surface to form a functionalized interfacial layer. The modified electrode exhibits an excellent electrocatalytic activity for the oxidation of L-cysteine. The currents(measured by different pulse voltammetric techniques) increase linearly with the increase of the concentration of L-cysteine in the range from 1×10 -6 to 2×10 -3 mol/L. The detection limit is 2×10 -7 mol/L. The modified electrode has the best properties of the two components of the system, such as the electrocatalytic properties of carbon nanotubes and the molecular recognition and accumulation abilities of α-cyclodextrin. The result demonstrates that it has a good stability and reproducibility and is available in the detection of L-cysteine in urine.
