To investigate the molecular mechanism underlying the neuroprotective effect of lithium on cells, in this study, we exposed SH-SY5Y cells to 0.5 mmol/L lithium carbonate （Li2CO2） for 25-50 weeks and then detected th...To investigate the molecular mechanism underlying the neuroprotective effect of lithium on cells, in this study, we exposed SH-SY5Y cells to 0.5 mmol/L lithium carbonate （Li2CO2） for 25-50 weeks and then detected the expression levels of some neurobiology related genes and post-translational modifications of stress proteins in SH-SYSY cells, cDNA arrays showed that pyruvate kinase 2 （PKM2） and calmodulin 3 （CaM 3） expression levels were significantly down-regulated, phosphatase protein PP2A expression was lightly down-regulated, and casein kinase II （CK2）, threonine/tyrosine phosphatase 7 （PYST2）, and dopamine beta-hydroxylase （DBH） expression levels were significantly up-regulated. Besides, western blot analysis of stress proteins （HSP27, HSP70, GRP78 and GRP94） showed an over-expression of two proteins： a 105 kDa protein which is a hyper-phosphorylated isoform of GRP94, and a 108 kDa protein which is a phosphorylated tetramer of HSP27. These results suggest that the neuroprotective effects of lithium are likely related to gene expressions and post-translational modifications of proteins cited above.展开更多
Context: In case of diabetes, persistent and chronic hyperglycaemia may generate free radicals and reactive oxygen species (ROS), which trigger an oxidative stress. Garlic (Allium sativum) is a rich source of bioactiv...Context: In case of diabetes, persistent and chronic hyperglycaemia may generate free radicals and reactive oxygen species (ROS), which trigger an oxidative stress. Garlic (Allium sativum) is a rich source of bioactive compounds and is used in folk medicine for the treatment of various diseases, including diabetes. Besides, α-tocopherol and magnesium have been shown to possess antioxidative properties. Objective: Protective effects of either a garlic aqueous extract or an association of α-tocopherol and magnesium association upon oxidative stress and dysfunctions in kidney and brain of alloxan-diabetic rats were investigated. Results: Both garlic extract and the combination of α-tocopherol and magnesium were found to normalize many parameters which were shifted to pathological values as a consequence of the alloxan-induced diabetes: plasma creatinine and urea levels were decreased, protein leakage in urine was reduced and cortisol level was brought back to control value. In addition, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) activities, which were lowered in kidney and brain of diabetic animals, were restored by both treatments and, consequently, level of lipids peroxidation was reduced in these organs, as compared to diabetic animals. Conclusion: Both garlic extract and α-tocopherol + magnesium association display beneficial effects upon nephropathy and oxidative stress in alloxan-diabetic rats. The protective effect of garlic is mainly attributed to antioxidant properties and the presence of phenolic acids and flavonoids.展开更多
文摘To investigate the molecular mechanism underlying the neuroprotective effect of lithium on cells, in this study, we exposed SH-SY5Y cells to 0.5 mmol/L lithium carbonate （Li2CO2） for 25-50 weeks and then detected the expression levels of some neurobiology related genes and post-translational modifications of stress proteins in SH-SYSY cells, cDNA arrays showed that pyruvate kinase 2 （PKM2） and calmodulin 3 （CaM 3） expression levels were significantly down-regulated, phosphatase protein PP2A expression was lightly down-regulated, and casein kinase II （CK2）, threonine/tyrosine phosphatase 7 （PYST2）, and dopamine beta-hydroxylase （DBH） expression levels were significantly up-regulated. Besides, western blot analysis of stress proteins （HSP27, HSP70, GRP78 and GRP94） showed an over-expression of two proteins： a 105 kDa protein which is a hyper-phosphorylated isoform of GRP94, and a 108 kDa protein which is a phosphorylated tetramer of HSP27. These results suggest that the neuroprotective effects of lithium are likely related to gene expressions and post-translational modifications of proteins cited above.
文摘Context: In case of diabetes, persistent and chronic hyperglycaemia may generate free radicals and reactive oxygen species (ROS), which trigger an oxidative stress. Garlic (Allium sativum) is a rich source of bioactive compounds and is used in folk medicine for the treatment of various diseases, including diabetes. Besides, α-tocopherol and magnesium have been shown to possess antioxidative properties. Objective: Protective effects of either a garlic aqueous extract or an association of α-tocopherol and magnesium association upon oxidative stress and dysfunctions in kidney and brain of alloxan-diabetic rats were investigated. Results: Both garlic extract and the combination of α-tocopherol and magnesium were found to normalize many parameters which were shifted to pathological values as a consequence of the alloxan-induced diabetes: plasma creatinine and urea levels were decreased, protein leakage in urine was reduced and cortisol level was brought back to control value. In addition, superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX) activities, which were lowered in kidney and brain of diabetic animals, were restored by both treatments and, consequently, level of lipids peroxidation was reduced in these organs, as compared to diabetic animals. Conclusion: Both garlic extract and α-tocopherol + magnesium association display beneficial effects upon nephropathy and oxidative stress in alloxan-diabetic rats. The protective effect of garlic is mainly attributed to antioxidant properties and the presence of phenolic acids and flavonoids.
