Objective We previously reported that mutations in inner mitochondrial membrane peptidase 2-like(Immp2l)increase infarct volume,enhance superoxide production,and suppress mitochondrial respiration after transient cere...Objective We previously reported that mutations in inner mitochondrial membrane peptidase 2-like(Immp2l)increase infarct volume,enhance superoxide production,and suppress mitochondrial respiration after transient cerebral focal ischemia and reperfusion injury.The present study investigated the impact of heterozygous Immp2l mutation on mitochondria function after ischemia and reperfusion injury in mice.Methods Mice were subjected to middle cerebral artery occlusion for 1 h followed by 0,1,5,and 24 h of reperfusion.The effects of Immp2l^(+/−)on mitochondrial membrane potential,mitochondrial respiratory complex III activity,caspase-3,and apoptosis-inducing factor(AIF)translocation were examined.Results Immp2l^(+/−)increased ischemic brain damage and the number of TUNEL-positive cells compared with wild-type mice.Immp2l^(+/−)led to mitochondrial damage,mitochondrial membrane potential depolarization,mitochondrial respiratory complex III activity suppression,caspase-3 activation,and AIF nuclear translocation.Conclusion The adverse impact of Immp2l^(+/−)on the brain after ischemia and reperfusion might be related to mitochondrial damage that involves depolarization of the mitochondrial membrane potential,inhibition of the mitochondrial respiratory complex III,and activation of mitochondria-mediated cell death pathways.These results suggest that patients with stroke carrying Immp2l^(+/−)might have worse and more severe infarcts,followed by a worse prognosis than those without Immp2l mutations.展开更多
Protein complexes are important for almost all biological processes.Hence,to fully understand how cells work,it is also necessary to characterize protein complexes and their dynamics in response to various cellular cu...Protein complexes are important for almost all biological processes.Hence,to fully understand how cells work,it is also necessary to characterize protein complexes and their dynamics in response to various cellular cues.Moreover,the dynamics of protein interaction play crucial roles in regulating the(dis)association of protein complexes and,in turn,regulating biological processes such as metabolism.Here,mitochondrial protein complexes were investigated by blue native PAGE and size-exclusion chromatography under conditions of oxidative stress in order to monitor their dynamic(dis)associations.Rearrangements of enzyme interactions and changes in protein complex abundance were observed in response to oxidative stress induced by menadione treatment.These included changes in enzymatic protein complexes involving g-amino butyric acid transaminase(GABA-T),D-ornithine aminotransferase(D-OAT),or proline dehydrogenase 1(POX1)that are expected to affect proline metabolism.Menadione treatment also affected interactions between several enzymes of the tricarboxylic acid(TCA)cycle and the abundance of complexes of the oxidative phosphorylation pathway.In addition,we compared the mitochondrial complexes of roots and shoots.Considerable differences between the two tissues were observed in the mitochondrial import/export apparatus,the formation of super-complexes in the oxidative phosphorylation pathway,and specific interactions between enzymes of the TCA cycle that we postulate may be related to the metabolic/energetic requirements of roots and shoots.展开更多
Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disease characterized by progressive degeneration of motor neurons,and it demonstrates high clinical heterogeneity and complex genetic architecture.A vari...Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disease characterized by progressive degeneration of motor neurons,and it demonstrates high clinical heterogeneity and complex genetic architecture.A variation within TRMT2B(c.1356G>T;p.K452N)was identified to be associated with ALS in a family comprising two patients with juvenile ALS(JALS).Two missense variations and one splicing variation were identified in 10 patients with ALS in a cohort with 910 patients with ALS,and three more variants were identified in a public ALS database including 3317 patients with ALS.A decreased number of mitochondria,swollen mitochondria,lower expression of ND1,decreased mitochondrial complex I activities,lower mitochondrial aerobic respiration,and a high level of ROS were observed functionally in patient-originated lymphoblastoid cell lines and TRMT2B interfering HEK293 cells.Further,TRMT2B variations overexpression cells also displayed decreased ND1.In conclusion,a novel JALS-associated gene called TRMT2B was identified,thus broadening the clinical and genetic spectrum of ALS.展开更多
Sulfonylureas are widely used oral anti-diabetic drugs.However,its long-term usage effects on patients’lifespan remain controversial,with no reports of influence on animal longevity.Hence,the anti-aging effects of ch...Sulfonylureas are widely used oral anti-diabetic drugs.However,its long-term usage effects on patients’lifespan remain controversial,with no reports of influence on animal longevity.Hence,the anti-aging effects of chlorpropamide along with glimepiride,glibenclamide,and tolbutamide were studied with special emphasis on the interaction of chlorpropamide with mitochondrial ATP-sensitive K+(mito K-ATP)channels and mitochondrial complex II.Chlorpropamide delayed aging in Caenorhabditis elegans,human lung fibroblast MRC-5 cells and reduced doxorubicin-induced senescence in both MRC-5 cells and mice.In addition,the mitochondrial membrane potential and ATP levels were significantly increased in chlorpropamide-treated worms,which is consistent with the function of its reported targets,mito K-ATP channels.Increased levels of mitochondrial reactive oxygen species(mt ROS)were observed in chlorpropamide-treated worms.Moreover,the lifespan extension by chlorpropamide required complex II and increased mt ROS levels,indicating that chlorpropamide acts on complex II directly or indirectly via mito K-ATP to increase the production of mt ROS as a pro-longevity signal.This study provides mechanistic insight into the anti-aging effects of sulfonylureas in C.elegans.展开更多
The mitochondrial respiratory complex Ⅱ or succinate:ubiquinone oxidoreductase(SQR)is a key membrane complex in both the tricarboxylic acid cycle and aerobic respiration.Five disinfectant compounds were investigated ...The mitochondrial respiratory complex Ⅱ or succinate:ubiquinone oxidoreductase(SQR)is a key membrane complex in both the tricarboxylic acid cycle and aerobic respiration.Five disinfectant compounds were investigated with their potent inhibition effects on the ubiquinone reduction activity of the porcine mitochondrial SQR by enzymatic assay and crystallography.Crystal structure of the SQR bound with thiabendazole(TBZ)reveals a different inhibitor-binding feature at the ubiquinone binding site where a water molecule plays an important role.The obvious inhibitory effect of TBZ based on the biochemical data(IC50~100μmol/L)and the significant structure-based binding affinity calculation(~94μmol/L)draw the suspicion of using TBZ as a good disinfectant compound for nematode infections treatment and fruit storage.展开更多
Parkinson’s disease(PD)is the second most common neurodegenerative disease,which is characterized by loss of dopaminergic(DA)neurons in the substantia nigra pars compacta and the formation of Lewy bodies and Lewy neu...Parkinson’s disease(PD)is the second most common neurodegenerative disease,which is characterized by loss of dopaminergic(DA)neurons in the substantia nigra pars compacta and the formation of Lewy bodies and Lewy neurites in surviving DA neurons in most cases.Although the cause of PD is still unclear,the remarkable advances have been made in understanding the possible causative mechanisms of PD pathogenesis.Numerous studies showed that dysfunction of mitochondria may play key roles in DA neuronal loss.Both genetic and environmental factors that are associated with PD contribute to mitochondrial dysfunction and PD pathogenesis.The induction of PD by neurotoxins that inhibit mitochondrial complex I provides direct evidence linking mitochondrial dysfunction to PD.Decrease of mitochondrial complex I activity is present in PD brain and in neurotoxin-or genetic factorinduced PD cellular and animal models.Moreover,PINK1 and parkin,two autosomal recessive PD gene products,have important roles in mitophagy,a cellular process to clear damaged mitochondria.PINK1 activates parkin to ubiquitinate outer mitochondrial membrane proteins to induce a selective degradation of damaged mitochondria by autophagy.In this review,we summarize the factors associated with PD and recent advances in understanding mitochondrial dysfunction in PD.展开更多
The treatment of microglial BV-2 cells with sodium arsenate(As(V):0.1-400 μmol/L — 48 hr)induces a dose-dependent response.The neurotoxic effects of high concentrations of As(V)(100,200 and 400 μmol/L) are...The treatment of microglial BV-2 cells with sodium arsenate(As(V):0.1-400 μmol/L — 48 hr)induces a dose-dependent response.The neurotoxic effects of high concentrations of As(V)(100,200 and 400 μmol/L) are characterized by increased levels of mitochondrial complexesⅠ,Ⅱ,and Ⅳ followed by increased superoxide anion generation.Moreover,As(V) triggers an apoptotic mode of cell death,demonstrated by an apoptotic SubG1 peak,associated with an alteration of plasma membrane integrity.There is also a decrease in transmembrane mitochondrial potential and mitochondrial adenosine triphosphate ATP.It is therefore tempting to speculate that As(V) triggers mitochondrial dysfunction,which may lead to defective oxidative phosphorylation subsequently causing mitochondrial oxidative damage,which in turn induces an apoptotic mode of cell death.展开更多
基金This study was supported by the National Natural Science Foundation of China(Nos.81360196,81760240the Natural Science Foundation of Ningxia(No.2022AAC03159)the Ningxia Innovation Team of the Foundation and Clinical Research of Diabetes and Its Complications(No.NXKJT2019010).
文摘Objective We previously reported that mutations in inner mitochondrial membrane peptidase 2-like(Immp2l)increase infarct volume,enhance superoxide production,and suppress mitochondrial respiration after transient cerebral focal ischemia and reperfusion injury.The present study investigated the impact of heterozygous Immp2l mutation on mitochondria function after ischemia and reperfusion injury in mice.Methods Mice were subjected to middle cerebral artery occlusion for 1 h followed by 0,1,5,and 24 h of reperfusion.The effects of Immp2l^(+/−)on mitochondrial membrane potential,mitochondrial respiratory complex III activity,caspase-3,and apoptosis-inducing factor(AIF)translocation were examined.Results Immp2l^(+/−)increased ischemic brain damage and the number of TUNEL-positive cells compared with wild-type mice.Immp2l^(+/−)led to mitochondrial damage,mitochondrial membrane potential depolarization,mitochondrial respiratory complex III activity suppression,caspase-3 activation,and AIF nuclear translocation.Conclusion The adverse impact of Immp2l^(+/−)on the brain after ischemia and reperfusion might be related to mitochondrial damage that involves depolarization of the mitochondrial membrane potential,inhibition of the mitochondrial respiratory complex III,and activation of mitochondria-mediated cell death pathways.These results suggest that patients with stroke carrying Immp2l^(+/−)might have worse and more severe infarcts,followed by a worse prognosis than those without Immp2l mutations.
基金supported by funding from the Max Planck Society(S.M.J.,A.G.,A.R.F.,and Y.Z.)the European Union’s Horizon 2020 research and innovation program,project PlantaSYST(SGA-CSA no.739582 under FPA no.664620)for supporting their researchfinancial support from the IMPRS-PMPG program.
文摘Protein complexes are important for almost all biological processes.Hence,to fully understand how cells work,it is also necessary to characterize protein complexes and their dynamics in response to various cellular cues.Moreover,the dynamics of protein interaction play crucial roles in regulating the(dis)association of protein complexes and,in turn,regulating biological processes such as metabolism.Here,mitochondrial protein complexes were investigated by blue native PAGE and size-exclusion chromatography under conditions of oxidative stress in order to monitor their dynamic(dis)associations.Rearrangements of enzyme interactions and changes in protein complex abundance were observed in response to oxidative stress induced by menadione treatment.These included changes in enzymatic protein complexes involving g-amino butyric acid transaminase(GABA-T),D-ornithine aminotransferase(D-OAT),or proline dehydrogenase 1(POX1)that are expected to affect proline metabolism.Menadione treatment also affected interactions between several enzymes of the tricarboxylic acid(TCA)cycle and the abundance of complexes of the oxidative phosphorylation pathway.In addition,we compared the mitochondrial complexes of roots and shoots.Considerable differences between the two tissues were observed in the mitochondrial import/export apparatus,the formation of super-complexes in the oxidative phosphorylation pathway,and specific interactions between enzymes of the TCA cycle that we postulate may be related to the metabolic/energetic requirements of roots and shoots.
基金supported by the Program of the National Natural Science Foundation of China(Nos.82171431 and 31972886)the Natural Science Fund for Distinguished Young Scholars of Hunan Province,China(Nos.2020JJ2057 and 2021JJ10074)+6 种基金Natural Science Foundation of Changsha City(No.kq2208402)the Program of the National Natural Science Foundation of Hunan Province(No.2021JJ40989)the Project Program of National Clinical Research Center for Geriatric Disorders at Xiangya Hospital(No.2020LNJJ13)the Science and Technology Innovation 2030(STI2030-Major Projects,No.2021ZD0201803)the National Key R&D Program of China(No.2021YFA0805202)the Innovation Team Project of Hunan Province(No.2019RS1010)the Innovation Team Project of Central South University(No.2020CX016).
文摘Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disease characterized by progressive degeneration of motor neurons,and it demonstrates high clinical heterogeneity and complex genetic architecture.A variation within TRMT2B(c.1356G>T;p.K452N)was identified to be associated with ALS in a family comprising two patients with juvenile ALS(JALS).Two missense variations and one splicing variation were identified in 10 patients with ALS in a cohort with 910 patients with ALS,and three more variants were identified in a public ALS database including 3317 patients with ALS.A decreased number of mitochondria,swollen mitochondria,lower expression of ND1,decreased mitochondrial complex I activities,lower mitochondrial aerobic respiration,and a high level of ROS were observed functionally in patient-originated lymphoblastoid cell lines and TRMT2B interfering HEK293 cells.Further,TRMT2B variations overexpression cells also displayed decreased ND1.In conclusion,a novel JALS-associated gene called TRMT2B was identified,thus broadening the clinical and genetic spectrum of ALS.
基金Financial support for this research provided by the National Natural Science Foundation of China(22037002 and 81772689)the Program for Professor of Special Appointment(Eastern Scholar TP2018025,China)at Shanghai Institutions of Higher Learning+2 种基金the Innovative Research Team of High-level Local Universities in Shanghaithe Chinese Special Fund for State Key Laboratory of Bioreactor Engineering(2060204,China)Strains of Caenorhabditis elegans were provided by the CGC,which is funded by NIH Office of Research Infrastructure Programs(P40 OD010440)。
文摘Sulfonylureas are widely used oral anti-diabetic drugs.However,its long-term usage effects on patients’lifespan remain controversial,with no reports of influence on animal longevity.Hence,the anti-aging effects of chlorpropamide along with glimepiride,glibenclamide,and tolbutamide were studied with special emphasis on the interaction of chlorpropamide with mitochondrial ATP-sensitive K+(mito K-ATP)channels and mitochondrial complex II.Chlorpropamide delayed aging in Caenorhabditis elegans,human lung fibroblast MRC-5 cells and reduced doxorubicin-induced senescence in both MRC-5 cells and mice.In addition,the mitochondrial membrane potential and ATP levels were significantly increased in chlorpropamide-treated worms,which is consistent with the function of its reported targets,mito K-ATP channels.Increased levels of mitochondrial reactive oxygen species(mt ROS)were observed in chlorpropamide-treated worms.Moreover,the lifespan extension by chlorpropamide required complex II and increased mt ROS levels,indicating that chlorpropamide acts on complex II directly or indirectly via mito K-ATP to increase the production of mt ROS as a pro-longevity signal.This study provides mechanistic insight into the anti-aging effects of sulfonylureas in C.elegans.
基金supported by grants from the National Basic Research Program(973 Program)(Nos.2011CB910301,2011CB910900,and 2006CB806506)the National Natural Science Foundation of China(Grant No.31021062).
文摘The mitochondrial respiratory complex Ⅱ or succinate:ubiquinone oxidoreductase(SQR)is a key membrane complex in both the tricarboxylic acid cycle and aerobic respiration.Five disinfectant compounds were investigated with their potent inhibition effects on the ubiquinone reduction activity of the porcine mitochondrial SQR by enzymatic assay and crystallography.Crystal structure of the SQR bound with thiabendazole(TBZ)reveals a different inhibitor-binding feature at the ubiquinone binding site where a water molecule plays an important role.The obvious inhibitory effect of TBZ based on the biochemical data(IC50~100μmol/L)and the significant structure-based binding affinity calculation(~94μmol/L)draw the suspicion of using TBZ as a good disinfectant compound for nematode infections treatment and fruit storage.
基金This work was supported by the National Basic Research Program of China(2012CB947602)the National Natural Sciences Foundation of China(No.31300887)+2 种基金Natural Science Foundation of Jiangsu Province(BK20130299)Suzhou Clinical Research Center of Neurological Disease(Szzx201503)Jiangsu Provincial Special Program of Medical Science(BL2014042).
文摘Parkinson’s disease(PD)is the second most common neurodegenerative disease,which is characterized by loss of dopaminergic(DA)neurons in the substantia nigra pars compacta and the formation of Lewy bodies and Lewy neurites in surviving DA neurons in most cases.Although the cause of PD is still unclear,the remarkable advances have been made in understanding the possible causative mechanisms of PD pathogenesis.Numerous studies showed that dysfunction of mitochondria may play key roles in DA neuronal loss.Both genetic and environmental factors that are associated with PD contribute to mitochondrial dysfunction and PD pathogenesis.The induction of PD by neurotoxins that inhibit mitochondrial complex I provides direct evidence linking mitochondrial dysfunction to PD.Decrease of mitochondrial complex I activity is present in PD brain and in neurotoxin-or genetic factorinduced PD cellular and animal models.Moreover,PINK1 and parkin,two autosomal recessive PD gene products,have important roles in mitophagy,a cellular process to clear damaged mitochondria.PINK1 activates parkin to ubiquitinate outer mitochondrial membrane proteins to induce a selective degradation of damaged mitochondria by autophagy.In this review,we summarize the factors associated with PD and recent advances in understanding mitochondrial dysfunction in PD.
基金supported by grants from the University of Bourgogne(Dijon,France)the University of Monastir(Monastir,Tunisia)
文摘The treatment of microglial BV-2 cells with sodium arsenate(As(V):0.1-400 μmol/L — 48 hr)induces a dose-dependent response.The neurotoxic effects of high concentrations of As(V)(100,200 and 400 μmol/L) are characterized by increased levels of mitochondrial complexesⅠ,Ⅱ,and Ⅳ followed by increased superoxide anion generation.Moreover,As(V) triggers an apoptotic mode of cell death,demonstrated by an apoptotic SubG1 peak,associated with an alteration of plasma membrane integrity.There is also a decrease in transmembrane mitochondrial potential and mitochondrial adenosine triphosphate ATP.It is therefore tempting to speculate that As(V) triggers mitochondrial dysfunction,which may lead to defective oxidative phosphorylation subsequently causing mitochondrial oxidative damage,which in turn induces an apoptotic mode of cell death.