目的 研究乙酰胆碱(ACh)对高糖诱导的心肌细胞损伤的影响及机制。方法 应用高糖处理H9c2细胞72 h,建立心肌细胞损伤模型。实验分为:①对照组(control);②高糖组(HG);③HG+ACh(10 -4 nmol·L^-1 )组;④HG+ACh+AICAR(0.5 nmol·L^...目的 研究乙酰胆碱(ACh)对高糖诱导的心肌细胞损伤的影响及机制。方法 应用高糖处理H9c2细胞72 h,建立心肌细胞损伤模型。实验分为:①对照组(control);②高糖组(HG);③HG+ACh(10 -4 nmol·L^-1 )组;④HG+ACh+AICAR(0.5 nmol·L^-1 )组;⑤HG+ACh+雷帕霉素(rapamycin, Rap)组(Rap 50 nmol·L^-1 );⑥HG+3-MA(2 mmol·L^-1 )组。MTT及ATP含量检测,评估各组细胞活性;Western blot观察各组自噬、凋亡及AMPK/mTOR信号通路相关蛋白表达变化;透射电镜观察各组细胞自噬小体的数量变化。结果与对照组相比,HG组LC3-Ⅱ/LC3-Ⅰ、p-AMPK/AMPK比值降低( P <0.05),p-mTOR/mTOR、Bax/Bcl-2比值升高( P <0.05);与HG组相比,HG+3-MA组Bax/Bcl-2比值降低( P <0.05),HG+ACh组心肌细胞活性增加( P <0.05),LC3-Ⅱ/LC3-Ⅰ、p-AMPK/AMPK、Bax/Bcl-2比值降低( P <0.05),p-mTOR/mTOR比值升高( P <0.05);与HG+ACh组相比,HG+ACh+AICAR组p-AMPK/AMPK比值升高( P <0.05),p-mTOR/mTOR比值降低( P <0.05),而LC3-Ⅱ/LC3-Ⅰ比值升高( P <0.05),HG+ACh+Rap组Bax/Bcl-2比值升高( P <0.05)。结论 ACh通过AMPK信号通路抑制自噬,保护高糖诱导的心肌细胞损伤。展开更多
Melanotic schwannoma is a rare variant of schwannoma composed of melanin-producing cells with ultrastructural features of schwann cells. The description of the course of the tumors differs somewhat, but it is generall...Melanotic schwannoma is a rare variant of schwannoma composed of melanin-producing cells with ultrastructural features of schwann cells. The description of the course of the tumors differs somewhat, but it is generally considered as a benign lesion. We investigated the clinicopathologic features, immunophenotypes, and ultrastructural features of 13 patients with nonpsammomatous melanotic schwannoma (NPMS).展开更多
文摘目的 研究乙酰胆碱(ACh)对高糖诱导的心肌细胞损伤的影响及机制。方法 应用高糖处理H9c2细胞72 h,建立心肌细胞损伤模型。实验分为:①对照组(control);②高糖组(HG);③HG+ACh(10 -4 nmol·L^-1 )组;④HG+ACh+AICAR(0.5 nmol·L^-1 )组;⑤HG+ACh+雷帕霉素(rapamycin, Rap)组(Rap 50 nmol·L^-1 );⑥HG+3-MA(2 mmol·L^-1 )组。MTT及ATP含量检测,评估各组细胞活性;Western blot观察各组自噬、凋亡及AMPK/mTOR信号通路相关蛋白表达变化;透射电镜观察各组细胞自噬小体的数量变化。结果与对照组相比,HG组LC3-Ⅱ/LC3-Ⅰ、p-AMPK/AMPK比值降低( P <0.05),p-mTOR/mTOR、Bax/Bcl-2比值升高( P <0.05);与HG组相比,HG+3-MA组Bax/Bcl-2比值降低( P <0.05),HG+ACh组心肌细胞活性增加( P <0.05),LC3-Ⅱ/LC3-Ⅰ、p-AMPK/AMPK、Bax/Bcl-2比值降低( P <0.05),p-mTOR/mTOR比值升高( P <0.05);与HG+ACh组相比,HG+ACh+AICAR组p-AMPK/AMPK比值升高( P <0.05),p-mTOR/mTOR比值降低( P <0.05),而LC3-Ⅱ/LC3-Ⅰ比值升高( P <0.05),HG+ACh+Rap组Bax/Bcl-2比值升高( P <0.05)。结论 ACh通过AMPK信号通路抑制自噬,保护高糖诱导的心肌细胞损伤。
基金This work was supported by a grant from the China Medical Board ofNew York (No. CMB 00-722).
文摘Melanotic schwannoma is a rare variant of schwannoma composed of melanin-producing cells with ultrastructural features of schwann cells. The description of the course of the tumors differs somewhat, but it is generally considered as a benign lesion. We investigated the clinicopathologic features, immunophenotypes, and ultrastructural features of 13 patients with nonpsammomatous melanotic schwannoma (NPMS).