Nuciferine contained in lotus leaves have been confirmed to have the effect of ameliorating hyperlipemia and hyperglycemia.A laser scanning confocal microscope was used to track the translocation of glucose transporte...Nuciferine contained in lotus leaves have been confirmed to have the effect of ameliorating hyperlipemia and hyperglycemia.A laser scanning confocal microscope was used to track the translocation of glucose transporter 4(GLUT4)in L6 cells and the changes in intracellular Ca^(2+)levels in real time,and related protease inhibitors combined with western blotting were used to explore the mechanism of nuciferine.Meanwhile,KK-Ay mice,the spontaneous type 2 diabetic mice,were used to evaluate the in vivo activity of nuciferine.In this study,the in vitro studies indicated that nuciferine-induced GLUT4 translocation was regulated by G protein-PLC-PKC and AMPK pathways and nuciferine-enhanced intracellular Ca^(2+)was mediated by G protein-PLC-IP3-IP3R pathway,the increase in intracellular Ca^(2+)caused by nuciferine was not directly related to GLUT4 translocation,but both promote glucose uptake.The in vivo results suggested that nuciferine ameliorated weight gain induced by high-fat diet,abnormal lipid metabolism and the symptoms of insulin resistance in KK-Ay diabetic mice.Western blot results suggested that nuciferine increased AMPK and PKC phosphorylation levels in skeletal muscle and liver,and enhanced GLUT4 expression in skeletal muscle.Taken together,this research showed that nuciferine has the non-negligible potential in the treatment of type 2 diabetes mellitus.展开更多
目的:研究不同肌糖原状态下运动诱导肌源性白细胞介素6(Interukin-6,IL-6)表达及蛋白释放与葡萄糖转运体4(Glucose Transport 4,GLUT4)基因表达的关系。方法:通过特定的运动方案和饮食方案造成大鼠在运动前体内肌糖原含量不同,再观察定...目的:研究不同肌糖原状态下运动诱导肌源性白细胞介素6(Interukin-6,IL-6)表达及蛋白释放与葡萄糖转运体4(Glucose Transport 4,GLUT4)基因表达的关系。方法:通过特定的运动方案和饮食方案造成大鼠在运动前体内肌糖原含量不同,再观察定量负荷跑台运动后肌源性IL-6表达及释放与葡萄糖转运体GLUT4基因表达的变化规律。结果:血清IL-6浓度在运动30min后显著增加,运动120min后达到峰值,运动后逐渐降低;骨骼肌IL-6mRNA在运动120min后显著增加,运动后3-6h继续增加至峰值;骨骼肌GLUT4mRNA在运动时并未增加,而在运动后3h开始增加,运动后6h达到峰值。上述三个指标在低肌糖原组的增加与正常糖原组相比更加显著。结论:低肌糖原含量可以促进运动中IL-6的释放及运动后恢复期IL-6和GLUT4的基因表达;运动导致恢复期GLUT4基因表达的增加很有可能与肌源性IL-6的表达及IL-6的自分泌作用有关。展开更多
基金financially supported by National Natural Science Foundation of China grants(81573561,81911540487,31070744)the Fundamental Research Funds for the Central Universities,South-Central University for Nationalities(CZR18003).
文摘Nuciferine contained in lotus leaves have been confirmed to have the effect of ameliorating hyperlipemia and hyperglycemia.A laser scanning confocal microscope was used to track the translocation of glucose transporter 4(GLUT4)in L6 cells and the changes in intracellular Ca^(2+)levels in real time,and related protease inhibitors combined with western blotting were used to explore the mechanism of nuciferine.Meanwhile,KK-Ay mice,the spontaneous type 2 diabetic mice,were used to evaluate the in vivo activity of nuciferine.In this study,the in vitro studies indicated that nuciferine-induced GLUT4 translocation was regulated by G protein-PLC-PKC and AMPK pathways and nuciferine-enhanced intracellular Ca^(2+)was mediated by G protein-PLC-IP3-IP3R pathway,the increase in intracellular Ca^(2+)caused by nuciferine was not directly related to GLUT4 translocation,but both promote glucose uptake.The in vivo results suggested that nuciferine ameliorated weight gain induced by high-fat diet,abnormal lipid metabolism and the symptoms of insulin resistance in KK-Ay diabetic mice.Western blot results suggested that nuciferine increased AMPK and PKC phosphorylation levels in skeletal muscle and liver,and enhanced GLUT4 expression in skeletal muscle.Taken together,this research showed that nuciferine has the non-negligible potential in the treatment of type 2 diabetes mellitus.
文摘目的:研究不同肌糖原状态下运动诱导肌源性白细胞介素6(Interukin-6,IL-6)表达及蛋白释放与葡萄糖转运体4(Glucose Transport 4,GLUT4)基因表达的关系。方法:通过特定的运动方案和饮食方案造成大鼠在运动前体内肌糖原含量不同,再观察定量负荷跑台运动后肌源性IL-6表达及释放与葡萄糖转运体GLUT4基因表达的变化规律。结果:血清IL-6浓度在运动30min后显著增加,运动120min后达到峰值,运动后逐渐降低;骨骼肌IL-6mRNA在运动120min后显著增加,运动后3-6h继续增加至峰值;骨骼肌GLUT4mRNA在运动时并未增加,而在运动后3h开始增加,运动后6h达到峰值。上述三个指标在低肌糖原组的增加与正常糖原组相比更加显著。结论:低肌糖原含量可以促进运动中IL-6的释放及运动后恢复期IL-6和GLUT4的基因表达;运动导致恢复期GLUT4基因表达的增加很有可能与肌源性IL-6的表达及IL-6的自分泌作用有关。