Objective To explore the role of extracellular vesicles(EVs)in the pathogenesis of glaucoma caused by E50K mutation.Methods A photoreceptor cell line,RGC-5,was transfected with empty plasmids and plasmids expressing w...Objective To explore the role of extracellular vesicles(EVs)in the pathogenesis of glaucoma caused by E50K mutation.Methods A photoreceptor cell line,RGC-5,was transfected with empty plasmids and plasmids expressing wild-type(WT)optineurin(OPTN)or E50K OPTN to investigate the effects of OPTN glaucoma as well as to identify the role of EVs in glaucoma pathology.The RGC-5 cells were also stimulated with glutamate,and their viability was evaluated using flow cytometry or CCK-8 assay.EVs were extracted,labeled with PKH-26,and added into the medium for normal RGC-5 culture,and the status of the cells was observed thereafter.Results WT OPTN overexpression,E50K OPTN,and glutamate stimulation induced apoptosis of RGC-5 cells.However,when glutamate stimulation was used as an add-on treatment,the degree of apoptosis in WT OPTN-overexpressing RGC-5 cells was significantly lower than that in E50K OPTN-expressing and normal RGC-5 cells.The viability of normal RGC-5 cells was reduced when co-cultured with WT OPTN-overexpressing RGC-5 or E50K OPTN-overexpressing RGC-5.EVs released by the latter two transfected lines similarly reduced normal RGC-5 survival.Conclusion Our results indicate that WT OPTN overexpression may lead to photoreceptor apoptosis.However,overexpression also confers a degree of protection against high concentrations of extracellular glutamate.Additionally,EVs released by transfected RGC-5 cells may regulate the cell state.These findings may improve our understanding of the mechanisms of cell-cell interactions in pathological conditions,providing a basis for the use of EVs as novel targets for early diagnosis and treatment of glaucoma.展开更多
Aim: A recent study found that the Optineurin (OPTN) gene was mutated in families with primary open angle glaucoma (POAG), A misense mutation E50K was present in 13.5% of families studied, and the M98K risk-associated...Aim: A recent study found that the Optineurin (OPTN) gene was mutated in families with primary open angle glaucoma (POAG), A misense mutation E50K was present in 13.5% of families studied, and the M98K risk-associated change was identified in 13.6% of POAG subjects. The aim of this study was to investi-展开更多
Glaucoma is a common neurodegenerative disease that can cause blindness and occurs worldwide. Currently, lowering intraocular pressure is the only therapy available to protect retinal ganglion cells (RGCs). However, t...Glaucoma is a common neurodegenerative disease that can cause blindness and occurs worldwide. Currently, lowering intraocular pressure is the only therapy available to protect retinal ganglion cells (RGCs). However, this therapy does not prevent RGC death in all patients. Therefore, new therapeutic approaches for glaucoma are urgently required, and neuroprotection of RGCs is a focus for many researchers. Optineurin (OPTN) is one of the normal tension glaucoma (NTG) relative genes, while mutant OPTN can form a characteristic aggregation, causing RGC death. Hence, elucidation of the mechanism of OPTN aggregation might provide a clue to help understand RGC death. To examine whether non-mutant OPTN could also aggregate, we pharmacologically induced some glaucoma-related stresses, such as endoplasmic reticulum (ER) stress, glutamate toxicity, activation of TNF-α signaling, mitochondrial dysfunction, and autophagic flux impairment. Our results showed that ER stress, TNF-α signaling, and autophagic flux are involved in OPTN aggregation. Furthermore, our data indicated that increased ER stress, activation of TNF-α signaling, and impaired autophagic flux induce OPTN aggregation, suggesting that OPTN aggregation might be an important therapeutic target not only for familial NTG with mutated OPTN but also for patients with glaucoma more generally.展开更多
Background:Amyotrophic lateral sclerosis(ALS)is irreversible and fatal within 3-5 years,with limited options for treatment.It is imperative to develop a symptom-based treatment that may increase the survival of ALS pa...Background:Amyotrophic lateral sclerosis(ALS)is irreversible and fatal within 3-5 years,with limited options for treatment.It is imperative to develop a symptom-based treatment that may increase the survival of ALS patients and improve their quality of life.Inflammation status,especially elevated interleukin 1β(IL1β),has been reported to play a critical role in ALS progression.Our study determined that neutralizing circulating IL1βslows down the progression of ALS in an ALS mouse model.Methods:The ALS mouse model was developed by microinjection of lentivirus-carrying OPTN^(E478G)(optineurin,a mutation from ALS patients)into the intra-motor cortex of mice.Peripheral circulating IL1βwas neutralized by injecting anti-IL1βan-tibody into the tail vein.Enzyme-linked immunosorbent assay(ELISA)and real-time polymerase chain reaction(RT-PCR)were carried out to determine the protein and gene expression levels of IL1β.TUNEL assay was used to assess the neural cell death.Immunofluorescent staining of MAP2 and CASP3 was accomplished to evaluate neuronal cell apoptosis.Glial fibrillary acidic protein staining was performed to ana-lyze the number of astrocytes.Rotarod test,grip strength test,balance beam test,and footprint test were conducted to assess the locomotive function after anti-IL1βtreatment.Results:The model revealed that neuroinflammation contributes to ALS progression.ALS mice exhibited elevated neuroinflammation and IL1βsecretion.After anti-IL1βtreatment,ALS mice revealed decreased neural cell death and astrogliosis and gained improved muscle strength and motor ability.Conclusions:Blocking IL1βis a promising strategy to slow down the progression of ALS.展开更多
Amyotrophic lateral sclerosis（ALS）is a devastating neurodegenerative disorder characterized by loss of upper and lower motor neurons.Different mechanisms contribute to the disease initiation and progression,includin...Amyotrophic lateral sclerosis（ALS）is a devastating neurodegenerative disorder characterized by loss of upper and lower motor neurons.Different mechanisms contribute to the disease initiation and progression,including mitochondrial dysfunction which has been proposed to be a central determinant in ALS pathogenesis.Indeed,while mitochondrial defects have been mainly described in ALS-linked SOD1 mutants,it is now well established that mitochondria become also dysfunctional in other ALS conditions.In such context,the mitochondrial quality control system allows to restore normal functioning of mitochondria and to prevent cell death,by both eliminating and replacing damaged mitochondrial components or by degrading the entire organelle through mitophagy.Recent evidence shows that ALS-related genes interfere with the mitochondrial quality control system.This review highlights how ineffective mitochondrial quality control may render motor neurons defenseless towards the accumulating mitochondrial damage in ALS.展开更多
Background:The association between optineurin(OPTN)M98K variant and primary open angle glaucoma(POAG)has been widely investigated.However,the results remain controversial among published meta-analyses.Therefore,we con...Background:The association between optineurin(OPTN)M98K variant and primary open angle glaucoma(POAG)has been widely investigated.However,the results remain controversial among published meta-analyses.Therefore,we conducted an updated meta-analysis to further explore the association between M98K and POAG and its subgroups.Methods:PubMed,Embase,Web of Science,and China National Knowledge Infrastructure(CNKI)databases were searched to find all articles describing the relationships between the M98K variant and POAG,which were published from the inception to 31 December,2019.The associations between M98K and overall POAG,normal tension glaucoma(NTG),high tension glaucoma(HTG),POAG in Asian and non-Asian populations,juvenile open angle glaucoma(JOAG)and adult-onset POAG were evaluated by calculating the pooled odds ratio(OR)and 95%confidence interval(CI).The Bonferroni correction was used to determine the statistically significant genetic models.Results:A total of 34 eligible articles involving 7,310 POAG patients and 5,173 controls were identified in the present meta-analysis.The articles achieved an average of 6.21 stars for quality assessment by the Newcastle-Ottawa Scale(NOS).Evidence from the pooled results indicated significant association between M98K and overall POAG susceptibility under the dominant model(OR=1.30,95%CI,1.12-1.52;P<0.001).In the subgroup analyses,no significant associations were found between M98K and the risks of NTG,HTG,JOAG,adult-onset POAG,Asian POAG or non-Asian POAG.Conclusions:The updated meta-analysis revealed that OPTN M98K was significantly associated with the susceptibility to overall POAG.展开更多
Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disorder with phenotypic and genetic heterogeneity.Recent studies have suggested an oligogenic basis of ALS,in which the co-occurrence of two or more gene...Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disorder with phenotypic and genetic heterogeneity.Recent studies have suggested an oligogenic basis of ALS,in which the co-occurrence of two or more genetic variants has additive or synergistic deleterious effects.To assess the contribution of possible oligogenic inheritance,we profiled a panel of 43 relevant genes in 57 sporadic ALS(sALS)patients and eight familial ALS(fALS)patients from five pedigrees in east China.We filtered rare variants using the combination of the Exome Aggregation Consortium,the 1000 Genomes and the HuaBiao Project.We analyzed patients with multiple rare variants in 43 known ALS causative genes and the genotype–phenotype cor-relation.Overall,we detected 30 rare variants in 16 different genes and found that 16 of the sALS patients and all the fALS patients examined harbored at least one variant in the investigated genes,among which two sALS and four fALS patients harbored two or more variants.Of note,the sALS patients with one or more variants in ALS genes had worse survival than the patients with no variants.Typically,in one fALS pedigree with three variants,the family member with three variants(Superoxide dismutase 1(SOD1)p.V48A,Optineurin(OPTN)p.A433V and TANK binding kinase 1(TBK1)p.R573H)exhibited much more severe disease phenotype than the member carrying one variant(TBK1 p.R573H).Our findings suggest that rare variants could exert a negative prognostic effect,thereby supporting the oligogenic inheritance of ALS.展开更多
基金supported by grants from the Wuhan Science and Technology Bureau(No.02.07.17040008.05)the Fundamental Research Funds for the Central Universities(2042020kf0099)the Opening Foundation of Hubei Key Laboratory(No.2021KFY054).
文摘Objective To explore the role of extracellular vesicles(EVs)in the pathogenesis of glaucoma caused by E50K mutation.Methods A photoreceptor cell line,RGC-5,was transfected with empty plasmids and plasmids expressing wild-type(WT)optineurin(OPTN)or E50K OPTN to investigate the effects of OPTN glaucoma as well as to identify the role of EVs in glaucoma pathology.The RGC-5 cells were also stimulated with glutamate,and their viability was evaluated using flow cytometry or CCK-8 assay.EVs were extracted,labeled with PKH-26,and added into the medium for normal RGC-5 culture,and the status of the cells was observed thereafter.Results WT OPTN overexpression,E50K OPTN,and glutamate stimulation induced apoptosis of RGC-5 cells.However,when glutamate stimulation was used as an add-on treatment,the degree of apoptosis in WT OPTN-overexpressing RGC-5 cells was significantly lower than that in E50K OPTN-expressing and normal RGC-5 cells.The viability of normal RGC-5 cells was reduced when co-cultured with WT OPTN-overexpressing RGC-5 or E50K OPTN-overexpressing RGC-5.EVs released by the latter two transfected lines similarly reduced normal RGC-5 survival.Conclusion Our results indicate that WT OPTN overexpression may lead to photoreceptor apoptosis.However,overexpression also confers a degree of protection against high concentrations of extracellular glutamate.Additionally,EVs released by transfected RGC-5 cells may regulate the cell state.These findings may improve our understanding of the mechanisms of cell-cell interactions in pathological conditions,providing a basis for the use of EVs as novel targets for early diagnosis and treatment of glaucoma.
文摘Aim: A recent study found that the Optineurin (OPTN) gene was mutated in families with primary open angle glaucoma (POAG), A misense mutation E50K was present in 13.5% of families studied, and the M98K risk-associated change was identified in 13.6% of POAG subjects. The aim of this study was to investi-
文摘Glaucoma is a common neurodegenerative disease that can cause blindness and occurs worldwide. Currently, lowering intraocular pressure is the only therapy available to protect retinal ganglion cells (RGCs). However, this therapy does not prevent RGC death in all patients. Therefore, new therapeutic approaches for glaucoma are urgently required, and neuroprotection of RGCs is a focus for many researchers. Optineurin (OPTN) is one of the normal tension glaucoma (NTG) relative genes, while mutant OPTN can form a characteristic aggregation, causing RGC death. Hence, elucidation of the mechanism of OPTN aggregation might provide a clue to help understand RGC death. To examine whether non-mutant OPTN could also aggregate, we pharmacologically induced some glaucoma-related stresses, such as endoplasmic reticulum (ER) stress, glutamate toxicity, activation of TNF-α signaling, mitochondrial dysfunction, and autophagic flux impairment. Our results showed that ER stress, TNF-α signaling, and autophagic flux are involved in OPTN aggregation. Furthermore, our data indicated that increased ER stress, activation of TNF-α signaling, and impaired autophagic flux induce OPTN aggregation, suggesting that OPTN aggregation might be an important therapeutic target not only for familial NTG with mutated OPTN but also for patients with glaucoma more generally.
基金National Natural Science Foundation of China(grant numbers:82172502 and 81974127).
文摘Background:Amyotrophic lateral sclerosis(ALS)is irreversible and fatal within 3-5 years,with limited options for treatment.It is imperative to develop a symptom-based treatment that may increase the survival of ALS patients and improve their quality of life.Inflammation status,especially elevated interleukin 1β(IL1β),has been reported to play a critical role in ALS progression.Our study determined that neutralizing circulating IL1βslows down the progression of ALS in an ALS mouse model.Methods:The ALS mouse model was developed by microinjection of lentivirus-carrying OPTN^(E478G)(optineurin,a mutation from ALS patients)into the intra-motor cortex of mice.Peripheral circulating IL1βwas neutralized by injecting anti-IL1βan-tibody into the tail vein.Enzyme-linked immunosorbent assay(ELISA)and real-time polymerase chain reaction(RT-PCR)were carried out to determine the protein and gene expression levels of IL1β.TUNEL assay was used to assess the neural cell death.Immunofluorescent staining of MAP2 and CASP3 was accomplished to evaluate neuronal cell apoptosis.Glial fibrillary acidic protein staining was performed to ana-lyze the number of astrocytes.Rotarod test,grip strength test,balance beam test,and footprint test were conducted to assess the locomotive function after anti-IL1βtreatment.Results:The model revealed that neuroinflammation contributes to ALS progression.ALS mice exhibited elevated neuroinflammation and IL1βsecretion.After anti-IL1βtreatment,ALS mice revealed decreased neural cell death and astrogliosis and gained improved muscle strength and motor ability.Conclusions:Blocking IL1βis a promising strategy to slow down the progression of ALS.
文摘Amyotrophic lateral sclerosis（ALS）is a devastating neurodegenerative disorder characterized by loss of upper and lower motor neurons.Different mechanisms contribute to the disease initiation and progression,including mitochondrial dysfunction which has been proposed to be a central determinant in ALS pathogenesis.Indeed,while mitochondrial defects have been mainly described in ALS-linked SOD1 mutants,it is now well established that mitochondria become also dysfunctional in other ALS conditions.In such context,the mitochondrial quality control system allows to restore normal functioning of mitochondria and to prevent cell death,by both eliminating and replacing damaged mitochondrial components or by degrading the entire organelle through mitophagy.Recent evidence shows that ALS-related genes interfere with the mitochondrial quality control system.This review highlights how ineffective mitochondrial quality control may render motor neurons defenseless towards the accumulating mitochondrial damage in ALS.
基金This work was supported by Major Project of National Natural Science Foundation of China(NSFC)-Guangdong Province Joint Fund(grant number 3030902113080)the Science and Technology Planning Project of Guangdong Province(grant number 303090100502050-18)+2 种基金Guangzhou Science and Technology Plan Project(grant number 2018-1202-SF-0019)Research Funds of the State Key Laboratory of Ophthalmology(grant number 30306020240020153,30306020240020192,3030902113058,3030902113118,PT1001022)Fundamental Research Funds of Sun Yat-sen University(grant number 16ykjc31).
文摘Background:The association between optineurin(OPTN)M98K variant and primary open angle glaucoma(POAG)has been widely investigated.However,the results remain controversial among published meta-analyses.Therefore,we conducted an updated meta-analysis to further explore the association between M98K and POAG and its subgroups.Methods:PubMed,Embase,Web of Science,and China National Knowledge Infrastructure(CNKI)databases were searched to find all articles describing the relationships between the M98K variant and POAG,which were published from the inception to 31 December,2019.The associations between M98K and overall POAG,normal tension glaucoma(NTG),high tension glaucoma(HTG),POAG in Asian and non-Asian populations,juvenile open angle glaucoma(JOAG)and adult-onset POAG were evaluated by calculating the pooled odds ratio(OR)and 95%confidence interval(CI).The Bonferroni correction was used to determine the statistically significant genetic models.Results:A total of 34 eligible articles involving 7,310 POAG patients and 5,173 controls were identified in the present meta-analysis.The articles achieved an average of 6.21 stars for quality assessment by the Newcastle-Ottawa Scale(NOS).Evidence from the pooled results indicated significant association between M98K and overall POAG susceptibility under the dominant model(OR=1.30,95%CI,1.12-1.52;P<0.001).In the subgroup analyses,no significant associations were found between M98K and the risks of NTG,HTG,JOAG,adult-onset POAG,Asian POAG or non-Asian POAG.Conclusions:The updated meta-analysis revealed that OPTN M98K was significantly associated with the susceptibility to overall POAG.
基金This work was supported by 2020 Central Transfer Payment Medical Siege Institutions Capacity Building Project(National and Provincial Multi-scientific Cooperation Diagnosis and Treatment of Major Diseases Capacity Building Project)Shanghai Fudan University Education Development Foundation and State Key Laboratory of Genetic Engineering,Human Phenome Institute,Zhangjiang Fudan International Innovation Center,Fudan UniversityShanghai Municipal Science and Technology Major Project 2017HZDZX01.
文摘Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disorder with phenotypic and genetic heterogeneity.Recent studies have suggested an oligogenic basis of ALS,in which the co-occurrence of two or more genetic variants has additive or synergistic deleterious effects.To assess the contribution of possible oligogenic inheritance,we profiled a panel of 43 relevant genes in 57 sporadic ALS(sALS)patients and eight familial ALS(fALS)patients from five pedigrees in east China.We filtered rare variants using the combination of the Exome Aggregation Consortium,the 1000 Genomes and the HuaBiao Project.We analyzed patients with multiple rare variants in 43 known ALS causative genes and the genotype–phenotype cor-relation.Overall,we detected 30 rare variants in 16 different genes and found that 16 of the sALS patients and all the fALS patients examined harbored at least one variant in the investigated genes,among which two sALS and four fALS patients harbored two or more variants.Of note,the sALS patients with one or more variants in ALS genes had worse survival than the patients with no variants.Typically,in one fALS pedigree with three variants,the family member with three variants(Superoxide dismutase 1(SOD1)p.V48A,Optineurin(OPTN)p.A433V and TANK binding kinase 1(TBK1)p.R573H)exhibited much more severe disease phenotype than the member carrying one variant(TBK1 p.R573H).Our findings suggest that rare variants could exert a negative prognostic effect,thereby supporting the oligogenic inheritance of ALS.
