Optic nerve transection increased the expression of heat shock protein 72 （HSP72） in the lateral geniculate body, indicating that this protein is involved in the prevention of neuronal injury. Zinc sulfate and querc...Optic nerve transection increased the expression of heat shock protein 72 （HSP72） in the lateral geniculate body, indicating that this protein is involved in the prevention of neuronal injury. Zinc sulfate and quercetin induced and inhibited the expression of HSP72, respectively. Intraperitoneal injections of zinc sulfate, SP600125 （c-Jun N-terminal kinase inhibitor）, or quercetin were performed on retinal ganglion cells in a Wistar rat model of chronic ocular hypertension. Our results showed that compared with the control group, the expression of HSP72 in retinal ganglion cells and the lateral geniculate body was increased after the injection of zinc sulfate, but was decreased after the injection of quercetin. The expression of phosphorylated c-Jun N-terminal kinases and phosphorylated c-Jun were visible 3 days after injection in the control group, and reached apeak at 7 days. Zinc sulfate and SP600125 significantly decreased the expression of p-c-Jun, whereas quercetin significantly enhanced the expression of this protein. These results suggest that HSP72 protects retinal ganglion cells and lateral geniculate body in a rat model of chronic ocular hypertension from injury by blocking the activation of the stress-activated kinase/c-Jun N-terminal kinase apoptotic pathway.展开更多
目的研究c-Jun N-terminal protein kinase(JNK)在1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-Methyl-4-phenyl-1,2,3,6-tetrahy-dropyridine,MPTP)所致亚急性帕金森病(Parkinson's disease,PD)小鼠模型中对黑质环氧合酶-2(cyclooxygenase-2...目的研究c-Jun N-terminal protein kinase(JNK)在1-甲基-4-苯基-1,2,3,6-四氢吡啶(1-Methyl-4-phenyl-1,2,3,6-tetrahy-dropyridine,MPTP)所致亚急性帕金森病(Parkinson's disease,PD)小鼠模型中对黑质环氧合酶-2(cyclooxygenase-2,Cox-2)、半胱氨酸天冬氨酸蛋白酶-3(caspase-3)的表达调控作用,以探讨PD模型黑质多巴胺(dopamine,DA)能神经元变性失活的可能机制。方法采用MPTP制备亚急性PD小鼠模型,通过行为学观察、SP法免疫组化和免疫蛋白印记法,观察模型小鼠黑质区酪氨酸羟化酶(tyrosine hydroxylase,TH)、Cox-2、caspase-3,磷酸化c-Jun(Ser63,p-c-Jun)免疫阳性细胞数量和中脑黑质区TH、Cox-2、caspase-3和p-c-Jun表达水平的变化;观察给予JNK通路特异性抑制剂SP600125后对上述变化的影响。结果与对照组小鼠相比,模型组小鼠出现PD典型的行为学表现,黑质区TH阳性神经元和中脑黑质TH含量分别下降约65%和75%,黑质区Cox-2与caspase-3阳性细胞数和中脑黑质Cox-2与caspase-3含量显著增加,黑质区p-c-Jun表达于细胞核内且中脑黑质p-c-Jun含量大幅升高;经JNK抑制剂SP600125处理的PD小鼠行为表现较轻,TH阳性神经元数量和TH表达水平仅较对照组分别下降约15%和25%,与模型组比较,Cox-2与caspase-3阳性细胞显著减少(P<0.001),p-c-Jun主要表达于细胞质内,中脑黑质Cox-2、caspase-3、p-c-Jun含量明显下降。结论JNK通路在MPTP诱导的黑质区细胞炎症与凋亡过程中可能起重要调控作用;JNK抑制剂对PD小鼠可能具有神经保护作用。展开更多
[目的]研究c-Jun氨基端激酶(c-Jun N-terminal protein kinase,JNK)在1-甲基4-苯基-1,2,3,6-四氢吡啶(MPTP)所致小鼠帕金森病(Parkinson's disease,PD)模型中对PD黑质多巴胺(Dopamine,DA)能神经元丢失的可能机制以及人参皂甙Rg1的...[目的]研究c-Jun氨基端激酶(c-Jun N-terminal protein kinase,JNK)在1-甲基4-苯基-1,2,3,6-四氢吡啶(MPTP)所致小鼠帕金森病(Parkinson's disease,PD)模型中对PD黑质多巴胺(Dopamine,DA)能神经元丢失的可能机制以及人参皂甙Rg1的神经保护作用。[方法]采用神经毒素MPTP制备PD小鼠模型,免疫组织化学法与蛋白印迹法观察各组小鼠黑质酪氨酸羟化酶(TH)和磷酸化c-Jun(p-c-jun)表达变化;原位末端标记法(TUNEL)观察黑质细胞凋亡数量变化。[结果]与对照组相比,模型组小鼠黑质致密带TH阳性神经元显著减少约55%(P﹤0.01),p-c-jun表达水平亦明显升高,黑质神经元TUNEL阳性细胞数量增高;人参皂甙Rg1干预组黑质TH阳性神经元细胞丢失明显减轻31%(P﹤0.01),p-c-jun表达水平明显下降,黑质神经元TUNEL阳性细胞数量显著减少。[结论]JNK通路可能通过凋亡途径参与模型小鼠黑质多巴胺能神经元丢失过程;人参皂甙Rg1可在一定程度上阻抑黑质区JNK信号通路,减轻MPTP诱导的PD小鼠黑质DA能神经元凋亡;人参皂甙Rg1对帕金森病小鼠具有一定的神经保护作用。展开更多
基金financially supported by the National Natural Science Foundation of China,No.81170843,81370913the Natural Science Foundation of Hunan Province,China,No.5JJ30051+2 种基金New Century Excellent Talents in University from the Ministry of Education of China,No.NCET-06-0677the Natural Science Foundation of Anhui Province,China,No.1408085QH158the First Affiliated Hospital of Anhui Medical University,Incubation Program of the National Natural Science Foundation for Young Scholars of China,No.2012KJ19
文摘Optic nerve transection increased the expression of heat shock protein 72 （HSP72） in the lateral geniculate body, indicating that this protein is involved in the prevention of neuronal injury. Zinc sulfate and quercetin induced and inhibited the expression of HSP72, respectively. Intraperitoneal injections of zinc sulfate, SP600125 （c-Jun N-terminal kinase inhibitor）, or quercetin were performed on retinal ganglion cells in a Wistar rat model of chronic ocular hypertension. Our results showed that compared with the control group, the expression of HSP72 in retinal ganglion cells and the lateral geniculate body was increased after the injection of zinc sulfate, but was decreased after the injection of quercetin. The expression of phosphorylated c-Jun N-terminal kinases and phosphorylated c-Jun were visible 3 days after injection in the control group, and reached apeak at 7 days. Zinc sulfate and SP600125 significantly decreased the expression of p-c-Jun, whereas quercetin significantly enhanced the expression of this protein. These results suggest that HSP72 protects retinal ganglion cells and lateral geniculate body in a rat model of chronic ocular hypertension from injury by blocking the activation of the stress-activated kinase/c-Jun N-terminal kinase apoptotic pathway.
文摘[目的]研究c-Jun氨基端激酶(c-Jun N-terminal protein kinase,JNK)在1-甲基4-苯基-1,2,3,6-四氢吡啶(MPTP)所致小鼠帕金森病(Parkinson's disease,PD)模型中对PD黑质多巴胺(Dopamine,DA)能神经元丢失的可能机制以及人参皂甙Rg1的神经保护作用。[方法]采用神经毒素MPTP制备PD小鼠模型,免疫组织化学法与蛋白印迹法观察各组小鼠黑质酪氨酸羟化酶(TH)和磷酸化c-Jun(p-c-jun)表达变化;原位末端标记法(TUNEL)观察黑质细胞凋亡数量变化。[结果]与对照组相比,模型组小鼠黑质致密带TH阳性神经元显著减少约55%(P﹤0.01),p-c-jun表达水平亦明显升高,黑质神经元TUNEL阳性细胞数量增高;人参皂甙Rg1干预组黑质TH阳性神经元细胞丢失明显减轻31%(P﹤0.01),p-c-jun表达水平明显下降,黑质神经元TUNEL阳性细胞数量显著减少。[结论]JNK通路可能通过凋亡途径参与模型小鼠黑质多巴胺能神经元丢失过程;人参皂甙Rg1可在一定程度上阻抑黑质区JNK信号通路,减轻MPTP诱导的PD小鼠黑质DA能神经元凋亡;人参皂甙Rg1对帕金森病小鼠具有一定的神经保护作用。
