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
2-Acetamidoacrylic acid or methyl 2-acetamidoacrylate is reacted with solution of sodium of methylselenol to give N-acetyl-Se-methylselenocysteine.The L(and D)-Se-methylselenocysteine have been prepared in high optica...2-Acetamidoacrylic acid or methyl 2-acetamidoacrylate is reacted with solution of sodium of methylselenol to give N-acetyl-Se-methylselenocysteine.The L(and D)-Se-methylselenocysteine have been prepared in high optical purity by treating N-acetyl-Se-methylselenocysteine in water using acylase I from porcine kidney as a catalyst.The influencing factors on the resolution reaction are discussed by orthogonal experiment,including pH value,reaction temperature,concentration of Co2+ and amount of acylase I.Under the optimizing resolution conditions,L(and D)-Se-methylselenocysteine are obtained with>96 % optical purity in about 40% yield.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2-Acetamidoacrylic acid or methyl 2-acetamidoacrylate is reacted with solution of sodium of methylselenol to give N-acetyl-Se-methylselenocysteine.The L(and D)-Se-methylselenocysteine have been prepared in high optical purity by treating N-acetyl-Se-methylselenocysteine in water using acylase I from porcine kidney as a catalyst.The influencing factors on the resolution reaction are discussed by orthogonal experiment,including pH value,reaction temperature,concentration of Co2+ and amount of acylase I.Under the optimizing resolution conditions,L(and D)-Se-methylselenocysteine are obtained with>96 % optical purity in about 40% yield.
