OBJECTIVE To investigate the mechanisms of histone deacetylase 6(HDAC6)deacetylation activity on NALP3 inflammasome activation and explore the protective effect s of pharmacological inhibition of HDAC6 on dopaminergic...OBJECTIVE To investigate the mechanisms of histone deacetylase 6(HDAC6)deacetylation activity on NALP3 inflammasome activation and explore the protective effect s of pharmacological inhibition of HDAC6 on dopaminergic injury.METHODS In vitro and in vivo6-OHDA induced Parkinson disease(PD) model was used.To distinguish the effect of deacetylase catalytic domains of HDAC6,we used a specific HDAC6 inhibitor tubastatin A(TBA),siRNAHDAC6,and pcDNA-HDAC6-FLAG plasmid.First,the role of pharmacological inhibition or siRNA or overexpression of HDAC6 on NALP3 inflammasome and cell death was explored by using Western blotting,TUNEL,and flow cytometric analysis.Then,the acetylation level of peroxiredoxin 2(Prx2) and the production of reactive oxygen species(ROS) in cells under different treatments was examined by using immunoprecipitation and DCFH-DA fluorescence assay.The effects of TBA on neuroinflammation and nigrostriatal dopaminergic system in vivo was further investigated by using Western blotting,immunohistochemistry and HPLC analysis.RESULTS TBA remarkably inhibited 6-OHDA induced NALP3 inflammasome activation,reduced dopaminergic neurodegeneration and neuroinflammation as demonstrated by increased TH-positive neurons,striatal levels of DA and its metabolites,and decreased gliocyte proliferation.TBA recovered acetylation of Prx2,and reduced ROS production,which was associated with decreased NALP3 inflammasome activation.CONCLUSION HDAC6 may medicate deacetylation of Prx2 contributes to NALP3 inflammasome activation in PD pathology,suggesting that the development of specific pharmacological inhibitors of HDAC6 be required for this kind of disease.展开更多
目的观察硫氧环蛋白过氧化物酶3(Prdx-3)在血管紧张素Ⅱ(AngⅡ)诱导心肌细胞肥大中的作用,并探讨其作用机制。方法体外培养心肌细胞(H9C2)随机分为对照组、AngⅡ组、AngⅡ+转染对照组和AngⅡ+Prdx-3转染组。脂质体转染法将Prdx-3表达质...目的观察硫氧环蛋白过氧化物酶3(Prdx-3)在血管紧张素Ⅱ(AngⅡ)诱导心肌细胞肥大中的作用,并探讨其作用机制。方法体外培养心肌细胞(H9C2)随机分为对照组、AngⅡ组、AngⅡ+转染对照组和AngⅡ+Prdx-3转染组。脂质体转染法将Prdx-3表达质粒转染心肌细胞,Western blot法检测Prdx-3蛋白表达,Real-time PCR法检测脑钠素(BNP)m RNA表达,二氯荧光素二乙酸(DCFH-DA)检测活性氧(ROS)水平。结果 Prdx-3表达质粒转染心肌细胞后,Prdx-3蛋白表达值为(0.88±0.12),高于转染对照组(0.38±0.05),差异有统计学意义(P<0.05)。与对照组比较,AngⅡ组BNP m RNA[(1.00±0.00)比(1.72±0.29)]、ROS[(3473±81)比(4439±111)]及Prdx-3蛋白表达水平[(0.33±0.05)比(0.72±0.14)]均明显增加,差异均有统计学意义(均P<0.05)。AngⅡ+转染对照组和AngⅡ组的BNP m RNA[(1.72±0.29)比(1.94±0.34)]、ROS[(4439±111)比(4285±167)]及Prdx-3蛋白水平[(0.72±0.14)比(0.75±0.11)]比较,差异无统计学意义(P>0.05)。与AngⅡ组比较,AngⅡ+Prdx-3转染组BNP m RNA[(1.72±0.29)比(1.29±0.15)]和ROS水平[(4439±111)比(3648±254)]明显下降,但Prdx-3蛋白水平[(0.72±0.14)比(1.89±0.37)]显著增高,差异均有统计学意义(均P<0.05)。结论 AngⅡ可通过ROS诱导心肌细胞肥大,而Prdx-3通过降低ROS抑制AngⅡ的作用。展开更多
Background:Peroxiredoxin-3(Prx-3)is known to be involved in the clearance of cellular hydrogen peroxide and plays an important role in protecting the myocardial tissue against damage of oxidative stress.However,the ro...Background:Peroxiredoxin-3(Prx-3)is known to be involved in the clearance of cellular hydrogen peroxide and plays an important role in protecting the myocardial tissue against damage of oxidative stress.However,the role of Prx-3 in protecting the myocardial tissue against renal ischemia/reperfusion(I/R)-induced myocardial injury(RI/RMI)remains unknown.We aimed to examine the antioxidative effect of Prx-3 using a rat RI/RMI model in an attempt to find a new approach to the prevention and treatment of myocardial injury induced by renal I/R.Methods:A RI/RMI rat model was established to detect the renal histopathology and renal functions by hematoxylin-eosin staining staining and commercially available assay kits.The myocardial antioxidant activity and the expressions of mRNA and protein of Prx-3 in the myocardial tissue were measured by real-time polymerase chain reaction and Western blotting assay,respectively.Results:Compared with the normal and control groups,the serum level of blood urea nitrogen and serum creatinine was significantly increased in the I/R group(P<0.05).Histopathological changes in the kidneys were also more obvious,including glomerular cystic and renal interstitial hemorrhage,renal tubular epithelial cell edema,and tubular type formation.The mRNA and protein expressions of Prx-3 were increased significantly in the RI/MRI rat model as compared with those in the normal and control groups.Conclusion:Oxidative damage occurred in the remote myocardium after renal I/R and Prx-3 was able to enhance the self-regulatory ability of the myocardium against damage from oxidative stress after RI/MRI.展开更多
Peroxiredoxin-6(PRDX6)is an antioxidant enzyme with both the activities of peroxidase and phospholipase A2(PLA2),which is involved in regulation of many cellular reactions.However,the function of PRDX6 during virus in...Peroxiredoxin-6(PRDX6)is an antioxidant enzyme with both the activities of peroxidase and phospholipase A2(PLA2),which is involved in regulation of many cellular reactions.However,the function of PRDX6 during virus infection remains unknown.In this study,we found that the abundance of PRDX6 protein was dramatically decreased in foot-and-mouth disease virus(FMDV)infected cells.Overexpression of PRDX6 inhibited FMDV replication.In contrast,knockdown of PRDX6 expression promoted FMDV replication,suggesting an antiviral role of PRDX6.To explore whether the activity of peroxidase and PLA2 was associated with PRDX6-mediated antiviral function,a specific inhibitor of PLA2(MJ33)and a specific inhibitor of peroxidase activity(mercaptosuccinate)were used to treat the cells before FMDV infection.The results showed that incubation of MJ33 but not mercaptosuccinate promoted FMDV replication.Meanwhile,overexpression of PRDX6 slightly enhanced type I interferon signaling.We further determined that the viral 3Cprowas responsible for degradation of PRDX6,and 3Cpro-induced reduction of PRDX6 was independent of the proteasome,lysosome,and caspase pathways.The protease activity of 3Cprowas required for induction of PRDX6 reduction.Besides,PRDX6 suppressed the replication of another porcine picornavirus Senecavirus A(SVA),and the 3Cproof SVA induced the reduction of PRDX6 through its proteolytic activity as well.Together,our results suggested that PRDX6 plays an important antiviral role during porcine picornavirus infection,and the viral 3Cproinduces the degradation of PRDX6 to overcome PRDX6-mediated antiviral function.展开更多
基金Key Technologies Research and Development Program of Shandong Province (2017GSF18171,2018GSF118139).
文摘OBJECTIVE To investigate the mechanisms of histone deacetylase 6(HDAC6)deacetylation activity on NALP3 inflammasome activation and explore the protective effect s of pharmacological inhibition of HDAC6 on dopaminergic injury.METHODS In vitro and in vivo6-OHDA induced Parkinson disease(PD) model was used.To distinguish the effect of deacetylase catalytic domains of HDAC6,we used a specific HDAC6 inhibitor tubastatin A(TBA),siRNAHDAC6,and pcDNA-HDAC6-FLAG plasmid.First,the role of pharmacological inhibition or siRNA or overexpression of HDAC6 on NALP3 inflammasome and cell death was explored by using Western blotting,TUNEL,and flow cytometric analysis.Then,the acetylation level of peroxiredoxin 2(Prx2) and the production of reactive oxygen species(ROS) in cells under different treatments was examined by using immunoprecipitation and DCFH-DA fluorescence assay.The effects of TBA on neuroinflammation and nigrostriatal dopaminergic system in vivo was further investigated by using Western blotting,immunohistochemistry and HPLC analysis.RESULTS TBA remarkably inhibited 6-OHDA induced NALP3 inflammasome activation,reduced dopaminergic neurodegeneration and neuroinflammation as demonstrated by increased TH-positive neurons,striatal levels of DA and its metabolites,and decreased gliocyte proliferation.TBA recovered acetylation of Prx2,and reduced ROS production,which was associated with decreased NALP3 inflammasome activation.CONCLUSION HDAC6 may medicate deacetylation of Prx2 contributes to NALP3 inflammasome activation in PD pathology,suggesting that the development of specific pharmacological inhibitors of HDAC6 be required for this kind of disease.
文摘目的观察硫氧环蛋白过氧化物酶3(Prdx-3)在血管紧张素Ⅱ(AngⅡ)诱导心肌细胞肥大中的作用,并探讨其作用机制。方法体外培养心肌细胞(H9C2)随机分为对照组、AngⅡ组、AngⅡ+转染对照组和AngⅡ+Prdx-3转染组。脂质体转染法将Prdx-3表达质粒转染心肌细胞,Western blot法检测Prdx-3蛋白表达,Real-time PCR法检测脑钠素(BNP)m RNA表达,二氯荧光素二乙酸(DCFH-DA)检测活性氧(ROS)水平。结果 Prdx-3表达质粒转染心肌细胞后,Prdx-3蛋白表达值为(0.88±0.12),高于转染对照组(0.38±0.05),差异有统计学意义(P<0.05)。与对照组比较,AngⅡ组BNP m RNA[(1.00±0.00)比(1.72±0.29)]、ROS[(3473±81)比(4439±111)]及Prdx-3蛋白表达水平[(0.33±0.05)比(0.72±0.14)]均明显增加,差异均有统计学意义(均P<0.05)。AngⅡ+转染对照组和AngⅡ组的BNP m RNA[(1.72±0.29)比(1.94±0.34)]、ROS[(4439±111)比(4285±167)]及Prdx-3蛋白水平[(0.72±0.14)比(0.75±0.11)]比较,差异无统计学意义(P>0.05)。与AngⅡ组比较,AngⅡ+Prdx-3转染组BNP m RNA[(1.72±0.29)比(1.29±0.15)]和ROS水平[(4439±111)比(3648±254)]明显下降,但Prdx-3蛋白水平[(0.72±0.14)比(1.89±0.37)]显著增高,差异均有统计学意义(均P<0.05)。结论 AngⅡ可通过ROS诱导心肌细胞肥大,而Prdx-3通过降低ROS抑制AngⅡ的作用。
基金This study was supported by the Opening Project of Key Laboratory of Evidence-Identifying in Universities of Shandong,Shandong University of Political Science and Law,China(2018KFKT2 to GX)the Research and Training Projects of Jiaxing University Medical College,China(JUMC2020-06 to DC)+1 种基金the Youth Innovative Research Team Program of Shandong Universities(2019KJE018 to XL)the Key R&D Projects of Shandong Province(2019RKB1034 to XL).
文摘Background:Peroxiredoxin-3(Prx-3)is known to be involved in the clearance of cellular hydrogen peroxide and plays an important role in protecting the myocardial tissue against damage of oxidative stress.However,the role of Prx-3 in protecting the myocardial tissue against renal ischemia/reperfusion(I/R)-induced myocardial injury(RI/RMI)remains unknown.We aimed to examine the antioxidative effect of Prx-3 using a rat RI/RMI model in an attempt to find a new approach to the prevention and treatment of myocardial injury induced by renal I/R.Methods:A RI/RMI rat model was established to detect the renal histopathology and renal functions by hematoxylin-eosin staining staining and commercially available assay kits.The myocardial antioxidant activity and the expressions of mRNA and protein of Prx-3 in the myocardial tissue were measured by real-time polymerase chain reaction and Western blotting assay,respectively.Results:Compared with the normal and control groups,the serum level of blood urea nitrogen and serum creatinine was significantly increased in the I/R group(P<0.05).Histopathological changes in the kidneys were also more obvious,including glomerular cystic and renal interstitial hemorrhage,renal tubular epithelial cell edema,and tubular type formation.The mRNA and protein expressions of Prx-3 were increased significantly in the RI/MRI rat model as compared with those in the normal and control groups.Conclusion:Oxidative damage occurred in the remote myocardium after renal I/R and Prx-3 was able to enhance the self-regulatory ability of the myocardium against damage from oxidative stress after RI/MRI.
基金supported by grants from the National Key R&D Program of China(2017YFD0501103)the Key Development and Research Foundation of Yunnan(2018BB004)+1 种基金the Chinese Academy of Agricultural Science and Technology Innovation Project(Y2017JC55)Central Public-interest Scientific Institution Basal Research Fund(1610312016013 and 1610312017003)。
文摘Peroxiredoxin-6(PRDX6)is an antioxidant enzyme with both the activities of peroxidase and phospholipase A2(PLA2),which is involved in regulation of many cellular reactions.However,the function of PRDX6 during virus infection remains unknown.In this study,we found that the abundance of PRDX6 protein was dramatically decreased in foot-and-mouth disease virus(FMDV)infected cells.Overexpression of PRDX6 inhibited FMDV replication.In contrast,knockdown of PRDX6 expression promoted FMDV replication,suggesting an antiviral role of PRDX6.To explore whether the activity of peroxidase and PLA2 was associated with PRDX6-mediated antiviral function,a specific inhibitor of PLA2(MJ33)and a specific inhibitor of peroxidase activity(mercaptosuccinate)were used to treat the cells before FMDV infection.The results showed that incubation of MJ33 but not mercaptosuccinate promoted FMDV replication.Meanwhile,overexpression of PRDX6 slightly enhanced type I interferon signaling.We further determined that the viral 3Cprowas responsible for degradation of PRDX6,and 3Cpro-induced reduction of PRDX6 was independent of the proteasome,lysosome,and caspase pathways.The protease activity of 3Cprowas required for induction of PRDX6 reduction.Besides,PRDX6 suppressed the replication of another porcine picornavirus Senecavirus A(SVA),and the 3Cproof SVA induced the reduction of PRDX6 through its proteolytic activity as well.Together,our results suggested that PRDX6 plays an important antiviral role during porcine picornavirus infection,and the viral 3Cproinduces the degradation of PRDX6 to overcome PRDX6-mediated antiviral function.
