Endoplasmic reticulum stress and mitochondrial dysfunction play important roles in Parkinson s disease,but the regulato ry mechanism remains elusive.Prohibitin-2(PHB2)is a newly discove red autophagy receptor in the m...Endoplasmic reticulum stress and mitochondrial dysfunction play important roles in Parkinson s disease,but the regulato ry mechanism remains elusive.Prohibitin-2(PHB2)is a newly discove red autophagy receptor in the mitochondrial inner membrane,and its role in Parkinson’s disease remains unclear.Protein kinase R(PKR)-like endoplasmic reticulum kinase(PERK)is a factor that regulates cell fate during endoplasmic reticulum stress.Parkin is regulated by PERK and is a target of the unfolded protein response.It is unclear whether PERK regulates PHB2-mediated mitophagy thro ugh Parkin.In this study,we established a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-induced mouse model of Parkinson’s disease.We used adeno-associated virus to knockdown PHB2 expression.Our res ults showed that loss of dopaminergic neurons and motor deficits were aggravated in the MPTP-induced mouse model of Parkinson’s disease.Ove rexpression of PHB2 inhibited these abnormalities.We also established a 1-methyl-4-phenylpyridine(MPP+)-induced SH-SY5Y cell model of Parkinson’s disease.We found that ove rexpression of Parkin increased co-localization of PHB2 and microtubule-associated protein 1 light chain 3,and promoted mitophagy.In addition,MPP+regulated Parkin involvement in PHB2-mediated mitophagy through phosphorylation of PERK.These findings suggest that PHB2 participates in the development of Parkinson’s disease by intera cting with endoplasmic reticulum stress and Parkin.展开更多
Trail, a tumor necrosis factor-related apoptosis-inducing ligand, is a novel potent endogenous activator of the cell death pathway through the activation of cell surface death receptors Trail-R1 and Trail-R2. Its role...Trail, a tumor necrosis factor-related apoptosis-inducing ligand, is a novel potent endogenous activator of the cell death pathway through the activation of cell surface death receptors Trail-R1 and Trail-R2. Its role, like FasL in activation-induced cell death (AICD), has been demonstrated in immune system. However the mechanism of Trail induced apoptosis remains unclear. In this report, the recombinant Trail protein was expressed and purified. The apoptosis-inducing activity and the regulation mechanism of recombinant Trail on Jurkat T cells were explored in vitro. Trypan blue exclusion assay demonstrated that the recombinant Trail protein actively killed Jurkat T cells in a dose-dependent manner. Trail-induced apoptosis in Jurkat T cells were remarkably reduced by Bcl-2 over expression in Bcl-2 gene transfected cells. Treatment with PMA (phorbol 12-myristate 13-acetate), a PKC activator, suppressed Trail-induced apoptosis in Jurkat T cells. The inhibition of apoptosis by PMA was abolished by pretreatment with Bis, a PKC inhibitor. Taken together, it was suggested that Bcl-2 over-expression and PMA activated PKC actively down-regulated the Trail-mediated apoptosis in Jurkat T cell.展开更多
OBJECTIVE To determine the functional role of hydrogen sulfide(H_2S) in protecting against mitochondrial dysfunction in heart failure through the inhibition of Ca^(2+)/calmodulin-dependent protein kinaseⅡ(Ca MKⅡ) us...OBJECTIVE To determine the functional role of hydrogen sulfide(H_2S) in protecting against mitochondrial dysfunction in heart failure through the inhibition of Ca^(2+)/calmodulin-dependent protein kinaseⅡ(Ca MKⅡ) using wild type and CSE knockout mouse models.METHODS Continuous subcutaneous injection isoprenaline(7.5 mg·kg^(-1) per day),once a day for 4 weeks to induce heart failure in male C57BL/6(6-8 weeks old) mice and CSE-/-mice.150 μmol·L^(-1) H_2O_2 was used to induce oxidative stress in H9c2 cells.Echocardiograph was used to detect cardiac parameters.H&E stain and Masson stain was to observation histopathological changes.Western blot was used to detect protein expression and activity.The si RNA was used to silence protein expression.HPLC was used to detect H_2S level.Biotin assay was used to detect the level of S-sulfhydration protein.RESULTS Treatment with S-propyl-L-cysteine(SPRC) or sodium hydrosulfide(Na HS),modulators of blood H_2S levels,attenuated the development of heart failure in animals,reduced lipid peroxidation,and preserved mitochondrial function.The inhibition Ca MKⅡ phosphorylation by SPRC and Na HS as demonstrated using both in vivo and in vitro models corresponded with the cardioprotective effects of these compounds.Interestingly,Ca MKⅡ activity was found to be elevated in CSE-/-mice as compared to wild type animals and the phosphorylation status of Ca MK Ⅱ appeared to relate to the severity of heart failure.Importantly,in wild type mice SPRC was found to promote S-sulfhydration of Ca MKⅡ leading to reduced activity of this protein however,in CSE-/-mice S-sulfhydration was abolished following SPRC treatment.CONCLUSION A novel mechanism depicting a role of S-sulfhydration in the regulation of Ca MKⅡ is presented.SPRC mediated S-sulfhydration of Ca MKⅡ was found to inhibit Ca MKⅡ activity and to preserve cardiovascular homeostasis.展开更多
目的:通过免疫共沉淀与质谱分析技术从宫颈癌HeLa细胞中获取与S期激酶相关蛋白2(S-phase kinase-associated protein 2,SKP2)结合的蛋白质群体并预测其生物功能。方法:以免疫共沉淀与Western blotting技术建立SKP2免疫共沉淀体系,以SDS-...目的:通过免疫共沉淀与质谱分析技术从宫颈癌HeLa细胞中获取与S期激酶相关蛋白2(S-phase kinase-associated protein 2,SKP2)结合的蛋白质群体并预测其生物功能。方法:以免疫共沉淀与Western blotting技术建立SKP2免疫共沉淀体系,以SDS-PAGE和银染技术获得SKP2结合蛋白的特异条带,通过质谱分析技术获得可能与SKP2结合的蛋白群体,应用生物信息学技术对筛选得到的蛋白进行GO分析与KEGG分析。结果:HeLa细胞内存在一定水平的SKP2蛋白表达,可进行免疫共沉淀反应;成功建立了SKP2免疫共沉淀体系,并获得SKP2结合蛋白样品;针对差异的凝胶条带进行质谱分析,共鉴定出SKP2结合蛋白563个;设定筛选条件后,获得可信度较高的SKP2蛋白270个,进行GO分析与KEGG分析后初步预测了结合蛋白参与的细胞功能和信号通路。结论:从宫颈癌HeLa细胞中成功筛选获取SKP2结合蛋白,为后续筛选靶标结合蛋白和寻找细胞靶向药物奠定了基础。展开更多
背景与目的S期激酶相关蛋白2(Skp2)是细胞周期正性调节因子之一,它能促进周期蛋白依赖性激酶抑制剂p27的泛素化蛋白水解,在肿瘤中过表达,本研究旨在探讨非小细胞肺癌(non-small cell lung cancer NSCLC)中Skp2表达的临床意义及其与p27...背景与目的S期激酶相关蛋白2(Skp2)是细胞周期正性调节因子之一,它能促进周期蛋白依赖性激酶抑制剂p27的泛素化蛋白水解,在肿瘤中过表达,本研究旨在探讨非小细胞肺癌(non-small cell lung cancer NSCLC)中Skp2表达的临床意义及其与p27蛋白表达的关系。方法应用组织芯片和免疫组织化学方法检测Skp2和p27在68例NSCLC组织和17例正常支气管上皮细胞中的表达。结果Skp2仅在肺癌组织中表达,且与患者的组织学类型(P=0.039),肿瘤细胞的分化程度(P=0.016),性别(P=0.012)和吸烟与否(P=0.026)显著相关,而与患者的年龄和TNM分期无关。p27在正常支气管上皮细胞中均有表达,在肺癌组织中表达降低;Skp2阳性表达的患者中p27表达明显降低,两者呈负相关(P=0.021)。结论在NSCLC中,Skp2蛋白表达的增高与p27泛素化依赖的蛋白降解有关,提示Skp2蛋白过表达在NSCLC的发生和发展中可能起重要作用。展开更多
目的探讨人胃癌S期激酶相关蛋白2(S-phase k inase-assoc iated prote in 2,Skp2)表达的意义及与p27表达的关系。方法采用免疫组化方法检测138例原发性胃癌,配对癌旁胃黏膜,102例配对淋巴结转移胃癌组织,30例非典型增生,30例肠上皮化生...目的探讨人胃癌S期激酶相关蛋白2(S-phase k inase-assoc iated prote in 2,Skp2)表达的意义及与p27表达的关系。方法采用免疫组化方法检测138例原发性胃癌,配对癌旁胃黏膜,102例配对淋巴结转移胃癌组织,30例非典型增生,30例肠上皮化生(肠化),10例慢性浅表性胃炎和5例正常胃黏膜Skp2的表达及138例原发性胃癌p27的表达。结果Skp2表达的阳性率(%),肠化(12.68±0.86)及癌旁胃黏膜(19.32±1.22)均明显高于慢性浅表性胃炎(0.53±0.13)及正常胃黏膜(0.47±0.19)(P=0.000),后两者差异无显著性(P=0.716);非典型增生(16.74±0.82)明显高于肠化(P=0.000);原发性胃癌(31.34±2.17)明显高于非典型增生及癌旁胃黏膜(P值均=0.000);淋巴结转移胃癌组织(39.76±2.00)明显高于原发性胃癌(P=0.037)。胃癌Skp2的阳性率与分化程度(rho=0.315,P=0.000)、脉管内瘤栓(rho=0.303,P=0.000)及淋巴结转移(rho=0.254,P=0.000)呈正相关。胃癌Skp2表达与靶蛋白p27表达呈负相关(rho=-0.451,P=0.000)。结论Skp2蛋白过表达与胃癌的发生及转移有关;胃癌Skp2蛋白过表达与p27蛋白降解有关,提示Skp2蛋白过表达在胃癌发生、发展过程中可能起重要作用。展开更多
基金supported by the Key Science and Technology Research of Henan Province,No.222102310351(to JW)Luoyang 2022 Medical and Health Guiding Science and Technology Plan Project,No.2022057Y(to JY)Henan Medical Science and Technology Research Program Province-Ministry Co-sponsorship,No.SBGJ202002099(to JY)。
文摘Endoplasmic reticulum stress and mitochondrial dysfunction play important roles in Parkinson s disease,but the regulato ry mechanism remains elusive.Prohibitin-2(PHB2)is a newly discove red autophagy receptor in the mitochondrial inner membrane,and its role in Parkinson’s disease remains unclear.Protein kinase R(PKR)-like endoplasmic reticulum kinase(PERK)is a factor that regulates cell fate during endoplasmic reticulum stress.Parkin is regulated by PERK and is a target of the unfolded protein response.It is unclear whether PERK regulates PHB2-mediated mitophagy thro ugh Parkin.In this study,we established a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-induced mouse model of Parkinson’s disease.We used adeno-associated virus to knockdown PHB2 expression.Our res ults showed that loss of dopaminergic neurons and motor deficits were aggravated in the MPTP-induced mouse model of Parkinson’s disease.Ove rexpression of PHB2 inhibited these abnormalities.We also established a 1-methyl-4-phenylpyridine(MPP+)-induced SH-SY5Y cell model of Parkinson’s disease.We found that ove rexpression of Parkin increased co-localization of PHB2 and microtubule-associated protein 1 light chain 3,and promoted mitophagy.In addition,MPP+regulated Parkin involvement in PHB2-mediated mitophagy through phosphorylation of PERK.These findings suggest that PHB2 participates in the development of Parkinson’s disease by intera cting with endoplasmic reticulum stress and Parkin.
基金Major State BasicResearch (973) Program of China, (G1999053905).
文摘Trail, a tumor necrosis factor-related apoptosis-inducing ligand, is a novel potent endogenous activator of the cell death pathway through the activation of cell surface death receptors Trail-R1 and Trail-R2. Its role, like FasL in activation-induced cell death (AICD), has been demonstrated in immune system. However the mechanism of Trail induced apoptosis remains unclear. In this report, the recombinant Trail protein was expressed and purified. The apoptosis-inducing activity and the regulation mechanism of recombinant Trail on Jurkat T cells were explored in vitro. Trypan blue exclusion assay demonstrated that the recombinant Trail protein actively killed Jurkat T cells in a dose-dependent manner. Trail-induced apoptosis in Jurkat T cells were remarkably reduced by Bcl-2 over expression in Bcl-2 gene transfected cells. Treatment with PMA (phorbol 12-myristate 13-acetate), a PKC activator, suppressed Trail-induced apoptosis in Jurkat T cells. The inhibition of apoptosis by PMA was abolished by pretreatment with Bis, a PKC inhibitor. Taken together, it was suggested that Bcl-2 over-expression and PMA activated PKC actively down-regulated the Trail-mediated apoptosis in Jurkat T cell.
文摘OBJECTIVE To determine the functional role of hydrogen sulfide(H_2S) in protecting against mitochondrial dysfunction in heart failure through the inhibition of Ca^(2+)/calmodulin-dependent protein kinaseⅡ(Ca MKⅡ) using wild type and CSE knockout mouse models.METHODS Continuous subcutaneous injection isoprenaline(7.5 mg·kg^(-1) per day),once a day for 4 weeks to induce heart failure in male C57BL/6(6-8 weeks old) mice and CSE-/-mice.150 μmol·L^(-1) H_2O_2 was used to induce oxidative stress in H9c2 cells.Echocardiograph was used to detect cardiac parameters.H&E stain and Masson stain was to observation histopathological changes.Western blot was used to detect protein expression and activity.The si RNA was used to silence protein expression.HPLC was used to detect H_2S level.Biotin assay was used to detect the level of S-sulfhydration protein.RESULTS Treatment with S-propyl-L-cysteine(SPRC) or sodium hydrosulfide(Na HS),modulators of blood H_2S levels,attenuated the development of heart failure in animals,reduced lipid peroxidation,and preserved mitochondrial function.The inhibition Ca MKⅡ phosphorylation by SPRC and Na HS as demonstrated using both in vivo and in vitro models corresponded with the cardioprotective effects of these compounds.Interestingly,Ca MKⅡ activity was found to be elevated in CSE-/-mice as compared to wild type animals and the phosphorylation status of Ca MK Ⅱ appeared to relate to the severity of heart failure.Importantly,in wild type mice SPRC was found to promote S-sulfhydration of Ca MKⅡ leading to reduced activity of this protein however,in CSE-/-mice S-sulfhydration was abolished following SPRC treatment.CONCLUSION A novel mechanism depicting a role of S-sulfhydration in the regulation of Ca MKⅡ is presented.SPRC mediated S-sulfhydration of Ca MKⅡ was found to inhibit Ca MKⅡ activity and to preserve cardiovascular homeostasis.
文摘目的:通过免疫共沉淀与质谱分析技术从宫颈癌HeLa细胞中获取与S期激酶相关蛋白2(S-phase kinase-associated protein 2,SKP2)结合的蛋白质群体并预测其生物功能。方法:以免疫共沉淀与Western blotting技术建立SKP2免疫共沉淀体系,以SDS-PAGE和银染技术获得SKP2结合蛋白的特异条带,通过质谱分析技术获得可能与SKP2结合的蛋白群体,应用生物信息学技术对筛选得到的蛋白进行GO分析与KEGG分析。结果:HeLa细胞内存在一定水平的SKP2蛋白表达,可进行免疫共沉淀反应;成功建立了SKP2免疫共沉淀体系,并获得SKP2结合蛋白样品;针对差异的凝胶条带进行质谱分析,共鉴定出SKP2结合蛋白563个;设定筛选条件后,获得可信度较高的SKP2蛋白270个,进行GO分析与KEGG分析后初步预测了结合蛋白参与的细胞功能和信号通路。结论:从宫颈癌HeLa细胞中成功筛选获取SKP2结合蛋白,为后续筛选靶标结合蛋白和寻找细胞靶向药物奠定了基础。
文摘背景与目的S期激酶相关蛋白2(Skp2)是细胞周期正性调节因子之一,它能促进周期蛋白依赖性激酶抑制剂p27的泛素化蛋白水解,在肿瘤中过表达,本研究旨在探讨非小细胞肺癌(non-small cell lung cancer NSCLC)中Skp2表达的临床意义及其与p27蛋白表达的关系。方法应用组织芯片和免疫组织化学方法检测Skp2和p27在68例NSCLC组织和17例正常支气管上皮细胞中的表达。结果Skp2仅在肺癌组织中表达,且与患者的组织学类型(P=0.039),肿瘤细胞的分化程度(P=0.016),性别(P=0.012)和吸烟与否(P=0.026)显著相关,而与患者的年龄和TNM分期无关。p27在正常支气管上皮细胞中均有表达,在肺癌组织中表达降低;Skp2阳性表达的患者中p27表达明显降低,两者呈负相关(P=0.021)。结论在NSCLC中,Skp2蛋白表达的增高与p27泛素化依赖的蛋白降解有关,提示Skp2蛋白过表达在NSCLC的发生和发展中可能起重要作用。
文摘目的探讨人胃癌S期激酶相关蛋白2(S-phase k inase-assoc iated prote in 2,Skp2)表达的意义及与p27表达的关系。方法采用免疫组化方法检测138例原发性胃癌,配对癌旁胃黏膜,102例配对淋巴结转移胃癌组织,30例非典型增生,30例肠上皮化生(肠化),10例慢性浅表性胃炎和5例正常胃黏膜Skp2的表达及138例原发性胃癌p27的表达。结果Skp2表达的阳性率(%),肠化(12.68±0.86)及癌旁胃黏膜(19.32±1.22)均明显高于慢性浅表性胃炎(0.53±0.13)及正常胃黏膜(0.47±0.19)(P=0.000),后两者差异无显著性(P=0.716);非典型增生(16.74±0.82)明显高于肠化(P=0.000);原发性胃癌(31.34±2.17)明显高于非典型增生及癌旁胃黏膜(P值均=0.000);淋巴结转移胃癌组织(39.76±2.00)明显高于原发性胃癌(P=0.037)。胃癌Skp2的阳性率与分化程度(rho=0.315,P=0.000)、脉管内瘤栓(rho=0.303,P=0.000)及淋巴结转移(rho=0.254,P=0.000)呈正相关。胃癌Skp2表达与靶蛋白p27表达呈负相关(rho=-0.451,P=0.000)。结论Skp2蛋白过表达与胃癌的发生及转移有关;胃癌Skp2蛋白过表达与p27蛋白降解有关,提示Skp2蛋白过表达在胃癌发生、发展过程中可能起重要作用。
