AIM： To study the relationship between interleukin-lbeta （IL-1β） up-regulating tissue inhibitor of matrix metalloproteinase-1 （TIMMP-1） mRNA expression and phosphorylation of both c-jun N-terminal kinase （INK）...AIM： To study the relationship between interleukin-lbeta （IL-1β） up-regulating tissue inhibitor of matrix metalloproteinase-1 （TIMMP-1） mRNA expression and phosphorylation of both c-jun N-terminal kinase （INK） and p38 in rat heffatic stellate cells （HSC）. METHODS： RT-PCR was performed to measure the expression of TIMMP-1 mRNA in rat HSC. Western blot was performed to measure IL-1β-induced JNK and p38 activities in rat HSC. RESULTS： TIMMP-1 mRNA expression （1.191± 0.079） was much higher after treatment with IL-1β （10 ng/mL） for 24 h than in control group （0.545±0.091） （P〈0.01）. IL-1β activated INK and p38 in a time-dependent manner. After stimulation with IL-1β for 0, 5, 15, 30, 60 and 120 min, the INK activity was 0.982±0.299, 1.501±0.720, 2.133±0.882, 3.360±0.452, 2.181±0.789, and 1.385 ± 0.368, respectively. There was a significant difference in JNK activity at 15 min （P〈 0.01）, 30 min （P〈 0.01） and 60 min （P〈0.01） in comparison to that at 0 min. The p38 activity was 1.061±0.310, 2.050±0.863, 2.380±0.573, 2.973±0.953, 2.421±0.793, and 1.755 ± 0.433 at the 6 time points （0, 5, 15, 30, 60 and 120 min） respectively. There was a significant difference in p38 activity at 5 min （P〈0.05）, 15 min （P〈0.01）, 30 min （P〈0.01） and 60 min （P〈0.01） compared to that at 0 min. TIMMP-1 mRNA expression trended to decrease in 3 groups pretreated with different concentrations of SP600125 （10 μmol/L, 1.022±0.113; 20 μmol/L, 0.869±0.070; 40 μmol/L, 0.666±0.123）. Their decreases were all significant （P〈0.05, P〈0.01, P〈0.01） in comparison to control group （without SP600125 treatment, 1.163±0.107）. In the other 3 groups pretreated with different concentrations of SB203580 （10 μmol/L, 1.507±0.099; 20 μmol/L, 1.698±0.107; 40 μmol/L, 1.857±0.054）, the expression of TIMMP-1 mRNA increased. Their levels were higher than those in the control group （without SB203580 treatment, 1.027 ± 0.061） with a significant statistical significance （P〈 0.01）. CONCLUSION： IL-1β has a direct action on hepatic fibrosis by up-regulating TIMMP-1 mRNA expression in ratessionin in rate HSC.JNK and p38 mitogen-activated protein kinases （MAPKs） are involved in IL-1β-induced TIMMP-1 gene expression, and play a distinct role in this process, indicating that p38 and .INK pathways cooperatively mediate TIMP-1 mRNA expression in rat HSC.展开更多
前期研究发现骨形态发生蛋白9(bone morphogenetic protein 9,BMP9)除了通过经典Smad途径外,也可通过丝裂原活化蛋白激酶(mitogen activated protein kinases,MAPKs)中的p38激酶途径调控间充质干细胞成骨分化.本研究继续探讨MAPKs的重...前期研究发现骨形态发生蛋白9(bone morphogenetic protein 9,BMP9)除了通过经典Smad途径外,也可通过丝裂原活化蛋白激酶(mitogen activated protein kinases,MAPKs)中的p38激酶途径调控间充质干细胞成骨分化.本研究继续探讨MAPKs的重要成员c-Jun氨基末端激酶(c-Jun N-terminal kinases,JNKs)对于BMP9诱导间充质干细胞成骨分化的调控作用.利用BMP9重组腺病毒感染间充质干细胞,通过体外细胞实验和体内动物实验,初步分析BMP9是否可通过JNKs激酶途径调控间充质干细胞成骨分化.结果表明:BMP9可通过促进JNKs激酶磷酸化而导致其活化;JNKs抑制剂SP600125可抑制由BMP9诱导的间充质干细胞的碱性磷酸酶(alkaline phosphatase,ALP)活性、骨桥蛋白(osteocpontin,OPN)和骨钙素(osteocalcin,OCN)表达以及钙盐沉积;利用抑制剂SP600125抑制JNKs激酶活性后,BMP9诱导Runx2的表达和转录活性,以及Smad经典途径的激活也相应受到抑制;RNA干扰导致JNKs基因沉默同样也可抑制BMP9诱导的间充质干细胞成骨分化以及裸鼠皮下异位成骨.因此,BMP9可通过活化JNKs激酶途径,从而调控间充质干细胞成骨分化.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
目的观察高渗透压对兔髓核细胞活性的影响及JNK/SAPK(c-Jun N-terminal kinases/stress-activated protein kinases)和p38信号转导通路在此过程中的作用。方法根据不同渗透压及时间段处理髓核细胞将实验分为对照组、刺激组和阻断组后采...目的观察高渗透压对兔髓核细胞活性的影响及JNK/SAPK(c-Jun N-terminal kinases/stress-activated protein kinases)和p38信号转导通路在此过程中的作用。方法根据不同渗透压及时间段处理髓核细胞将实验分为对照组、刺激组和阻断组后采用流式细胞仪检测各组髓核细胞凋亡情况,同时利用免疫荧光和Western blot技术检测磷酸化p38丝裂原活化蛋白激酶(phospho-p38mitogen-activated protein kinases,P-p38MAPK)、磷酸化JNK/SAPK激酶(phospho-JNK/SAPK,P-JNK/SAPK)的亚细胞定位及表达水平,观察其对髓核细胞凋亡的影响。结果高渗透压[600mOsm/kg H2O(mOsm)]可导致髓核细胞显著凋亡及P-p38 MAPK和P-JNK/SAPK蛋白表达水平改变。600mOsm时各刺激组凋亡细胞与对照组相比,差异均有显著统计学意义(P<0.01),而阻断组凋亡细胞明显减少;而400mOsm时各刺激组和阻断组凋亡细胞与对照组相比差异均无统计学意义;免疫荧光结果显示P-p38 MAPK和P-JNK/SAPK在髓核细胞质和细胞核中均有表达;经高渗透压(600mOsm)刺激后P-p38MAPK和P-JNK/SAPK表达均显著高于对照组(P<0.01),而相应阻断组P-p38MAPK和P-JNK/SAPK表达均显著降低。结论高渗透压通过激活JNK/SAPK和p38信号转导通路导致体外培养的兔髓核细胞凋亡,同时髓核细胞对轻度的渗透压升高具有一定的适应性。展开更多
细胞凋亡是当前生物医学研究的热点,JNK(c-Jun氨基末端激酶)是丝裂原激活的蛋白激酶(mitogen-activated protein kinase,MAPK)家族中转导并调控细胞凋亡信号的重要信号通路,本文主要介绍JNK信号转导通路与细胞凋亡的研究进展及运动与JN...细胞凋亡是当前生物医学研究的热点,JNK(c-Jun氨基末端激酶)是丝裂原激活的蛋白激酶(mitogen-activated protein kinase,MAPK)家族中转导并调控细胞凋亡信号的重要信号通路,本文主要介绍JNK信号转导通路与细胞凋亡的研究进展及运动与JNK信号通路。展开更多
文摘AIM： To study the relationship between interleukin-lbeta （IL-1β） up-regulating tissue inhibitor of matrix metalloproteinase-1 （TIMMP-1） mRNA expression and phosphorylation of both c-jun N-terminal kinase （INK） and p38 in rat heffatic stellate cells （HSC）. METHODS： RT-PCR was performed to measure the expression of TIMMP-1 mRNA in rat HSC. Western blot was performed to measure IL-1β-induced JNK and p38 activities in rat HSC. RESULTS： TIMMP-1 mRNA expression （1.191± 0.079） was much higher after treatment with IL-1β （10 ng/mL） for 24 h than in control group （0.545±0.091） （P〈0.01）. IL-1β activated INK and p38 in a time-dependent manner. After stimulation with IL-1β for 0, 5, 15, 30, 60 and 120 min, the INK activity was 0.982±0.299, 1.501±0.720, 2.133±0.882, 3.360±0.452, 2.181±0.789, and 1.385 ± 0.368, respectively. There was a significant difference in JNK activity at 15 min （P〈 0.01）, 30 min （P〈 0.01） and 60 min （P〈0.01） in comparison to that at 0 min. The p38 activity was 1.061±0.310, 2.050±0.863, 2.380±0.573, 2.973±0.953, 2.421±0.793, and 1.755 ± 0.433 at the 6 time points （0, 5, 15, 30, 60 and 120 min） respectively. There was a significant difference in p38 activity at 5 min （P〈0.05）, 15 min （P〈0.01）, 30 min （P〈0.01） and 60 min （P〈0.01） compared to that at 0 min. TIMMP-1 mRNA expression trended to decrease in 3 groups pretreated with different concentrations of SP600125 （10 μmol/L, 1.022±0.113; 20 μmol/L, 0.869±0.070; 40 μmol/L, 0.666±0.123）. Their decreases were all significant （P〈0.05, P〈0.01, P〈0.01） in comparison to control group （without SP600125 treatment, 1.163±0.107）. In the other 3 groups pretreated with different concentrations of SB203580 （10 μmol/L, 1.507±0.099; 20 μmol/L, 1.698±0.107; 40 μmol/L, 1.857±0.054）, the expression of TIMMP-1 mRNA increased. Their levels were higher than those in the control group （without SB203580 treatment, 1.027 ± 0.061） with a significant statistical significance （P〈 0.01）. CONCLUSION： IL-1β has a direct action on hepatic fibrosis by up-regulating TIMMP-1 mRNA expression in ratessionin in rate HSC.JNK and p38 mitogen-activated protein kinases （MAPKs） are involved in IL-1β-induced TIMMP-1 gene expression, and play a distinct role in this process, indicating that p38 and .INK pathways cooperatively mediate TIMP-1 mRNA expression in rat HSC.
文摘前期研究发现骨形态发生蛋白9(bone morphogenetic protein 9,BMP9)除了通过经典Smad途径外,也可通过丝裂原活化蛋白激酶(mitogen activated protein kinases,MAPKs)中的p38激酶途径调控间充质干细胞成骨分化.本研究继续探讨MAPKs的重要成员c-Jun氨基末端激酶(c-Jun N-terminal kinases,JNKs)对于BMP9诱导间充质干细胞成骨分化的调控作用.利用BMP9重组腺病毒感染间充质干细胞,通过体外细胞实验和体内动物实验,初步分析BMP9是否可通过JNKs激酶途径调控间充质干细胞成骨分化.结果表明:BMP9可通过促进JNKs激酶磷酸化而导致其活化;JNKs抑制剂SP600125可抑制由BMP9诱导的间充质干细胞的碱性磷酸酶(alkaline phosphatase,ALP)活性、骨桥蛋白(osteocpontin,OPN)和骨钙素(osteocalcin,OCN)表达以及钙盐沉积;利用抑制剂SP600125抑制JNKs激酶活性后,BMP9诱导Runx2的表达和转录活性,以及Smad经典途径的激活也相应受到抑制;RNA干扰导致JNKs基因沉默同样也可抑制BMP9诱导的间充质干细胞成骨分化以及裸鼠皮下异位成骨.因此,BMP9可通过活化JNKs激酶途径,从而调控间充质干细胞成骨分化.
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。
