Alzheimer's disease is characterized by deposition of amyloid-β,which forms extracellular neuritic plaques,and accumulation of hyperphosphorylated tau,which aggregates to form intraneuronal neurofibrillary tangle...Alzheimer's disease is characterized by deposition of amyloid-β,which forms extracellular neuritic plaques,and accumulation of hyperphosphorylated tau,which aggregates to form intraneuronal neurofibrillary tangles,in the brain.The NLRP3 inflammasome may play a role in the transition from amyloid-βdeposition to tau phosphorylation and aggregation.Because NLRP3 is primarily found in brain microglia,and tau is predominantly located in neurons,it has been suggested that NLRP3 expressed by microglia indirectly triggers tau phosphorylation by upregulating the expression of pro-inflammatory cytokines.Here,we found that neurons also express NLRP3 in vitro and in vivo,and that neuronal NLRP3 regulates tau phosphorylation.Using biochemical methods,we mapped the minimal NLRP3 promoter and identified FUBP3 as a transcription factor regulating NLRP3 expression in neurons.In primary neurons and the neuroblastoma cell line Neuro2A,FUBP3 is required for endogenous NLRP3 expression and tau phosphorylation only when amyloid-βis present.In the brains of aged wild-type mice and a mouse model of Alzheimer's disease,FUBP3 expression was markedly increased in cortical neurons.Transcriptome analysis suggested that FUBP3 plays a role in neuron-mediated immune responses.We also found that FUBP3 trimmed the 5′end of DNA fragments that it bound,implying that FUBP3 functions in stress-induced responses.These findings suggest that neuronal NLRP3 may be more directly involved in the amyloid-β-to–phospho-tau transition than microglial NLRP3,and that amyloid-βfundamentally alters the regulatory mechanism of NLRP3 expression in neurons.Given that FUBP3 was only expressed at low levels in young wild-type mice and was strongly upregulated in the brains of aged mice and Alzheimer's disease mice,FUBP3 could be a safe therapeutic target for preventing Alzheimer's disease progression.展开更多
In order to study the molecular mechanism of the inhibitory effect of 1,25-dihydroxyvitamin D3 on dendritic cells, experiments were performed using Atlas cDNA expression arrays from Clonetech to identify the different...In order to study the molecular mechanism of the inhibitory effect of 1,25-dihydroxyvitamin D3 on dendritic cells, experiments were performed using Atlas cDNA expression arrays from Clonetech to identify the differentially expressed genes of dendritic cells by 1,25-dihydroxyvitamin D3. Analysis of cDNA arrays revealed changes in the expression of 9 genes, including those involved in DNA binding and transcription, extracellular cell signaling and communication, intracellular transducers, as well as cell adhesions. The results indicated that a multiple molecular network is involved in the inhibitory role of 1,25-dihydroxyvitamin D3 on dendritic cells. The Atlas Array technology may facilitate the elucidation of complex pharmacological process of 1,25-dihydroxyvitamin D3 on dendritic cells.展开更多
利用SMART（switching mechanism at 5’end of the RNA transcript）技术构建了红肉猕猴桃品种‘红阳’（Actinidia chinesis cv‘Hongyang’）内果皮组织的全长cDNA文库，此文库的构建有助于克隆与次生代谢相关的基因，特别是红肉猕...利用SMART（switching mechanism at 5’end of the RNA transcript）技术构建了红肉猕猴桃品种‘红阳’（Actinidia chinesis cv‘Hongyang’）内果皮组织的全长cDNA文库，此文库的构建有助于克隆与次生代谢相关的基因，特别是红肉猕猴桃花青素特异合成代谢的基因。文库滴度为6．7×10^4cfu／mL，库容为2．72×10^8cfu／mL，文库重组率99．8％，插入片段多数分布在700～1000bp。随机挑选1014个克隆进行测序，测序成功963个，经过序列拼接去除低质量序列后获得632个unigenes，包括92个contigs和540个singletons，获得已知功能unigenes共441个。从所测克隆中得到一个花青素途径的结构基因AcF3H，其cDNA序列长1369bp（GenBank登录号：FJ542819），CDS区为1101bp，编码366个氨基酸的多肽。与拟南芥、葡萄及龙胆已知乃日氨基酸序列比对，发现该基因十分保守。通过RT—PCR技术对苍溪栽培的不同发育时期‘红阳’猕猴桃果实AcF3H基因的表达进行了分析。结果表明，果肉转色前AcF3H基因表达量较高，而转色初期表达量降低，此后随着果实着色加深表达量维持在较高水平。展开更多
基金supported by a grant from Key Laboratory of Alzheimer's Disease of Zhejiang Province,Institute of Aging,Wenzhou Medical University,No.ZJAD-2021002(to ZW)。
文摘Alzheimer's disease is characterized by deposition of amyloid-β,which forms extracellular neuritic plaques,and accumulation of hyperphosphorylated tau,which aggregates to form intraneuronal neurofibrillary tangles,in the brain.The NLRP3 inflammasome may play a role in the transition from amyloid-βdeposition to tau phosphorylation and aggregation.Because NLRP3 is primarily found in brain microglia,and tau is predominantly located in neurons,it has been suggested that NLRP3 expressed by microglia indirectly triggers tau phosphorylation by upregulating the expression of pro-inflammatory cytokines.Here,we found that neurons also express NLRP3 in vitro and in vivo,and that neuronal NLRP3 regulates tau phosphorylation.Using biochemical methods,we mapped the minimal NLRP3 promoter and identified FUBP3 as a transcription factor regulating NLRP3 expression in neurons.In primary neurons and the neuroblastoma cell line Neuro2A,FUBP3 is required for endogenous NLRP3 expression and tau phosphorylation only when amyloid-βis present.In the brains of aged wild-type mice and a mouse model of Alzheimer's disease,FUBP3 expression was markedly increased in cortical neurons.Transcriptome analysis suggested that FUBP3 plays a role in neuron-mediated immune responses.We also found that FUBP3 trimmed the 5′end of DNA fragments that it bound,implying that FUBP3 functions in stress-induced responses.These findings suggest that neuronal NLRP3 may be more directly involved in the amyloid-β-to–phospho-tau transition than microglial NLRP3,and that amyloid-βfundamentally alters the regulatory mechanism of NLRP3 expression in neurons.Given that FUBP3 was only expressed at low levels in young wild-type mice and was strongly upregulated in the brains of aged mice and Alzheimer's disease mice,FUBP3 could be a safe therapeutic target for preventing Alzheimer's disease progression.
文摘In order to study the molecular mechanism of the inhibitory effect of 1,25-dihydroxyvitamin D3 on dendritic cells, experiments were performed using Atlas cDNA expression arrays from Clonetech to identify the differentially expressed genes of dendritic cells by 1,25-dihydroxyvitamin D3. Analysis of cDNA arrays revealed changes in the expression of 9 genes, including those involved in DNA binding and transcription, extracellular cell signaling and communication, intracellular transducers, as well as cell adhesions. The results indicated that a multiple molecular network is involved in the inhibitory role of 1,25-dihydroxyvitamin D3 on dendritic cells. The Atlas Array technology may facilitate the elucidation of complex pharmacological process of 1,25-dihydroxyvitamin D3 on dendritic cells.
文摘利用SMART（switching mechanism at 5’end of the RNA transcript）技术构建了红肉猕猴桃品种‘红阳’（Actinidia chinesis cv‘Hongyang’）内果皮组织的全长cDNA文库，此文库的构建有助于克隆与次生代谢相关的基因，特别是红肉猕猴桃花青素特异合成代谢的基因。文库滴度为6．7×10^4cfu／mL，库容为2．72×10^8cfu／mL，文库重组率99．8％，插入片段多数分布在700～1000bp。随机挑选1014个克隆进行测序，测序成功963个，经过序列拼接去除低质量序列后获得632个unigenes，包括92个contigs和540个singletons，获得已知功能unigenes共441个。从所测克隆中得到一个花青素途径的结构基因AcF3H，其cDNA序列长1369bp（GenBank登录号：FJ542819），CDS区为1101bp，编码366个氨基酸的多肽。与拟南芥、葡萄及龙胆已知乃日氨基酸序列比对，发现该基因十分保守。通过RT—PCR技术对苍溪栽培的不同发育时期‘红阳’猕猴桃果实AcF3H基因的表达进行了分析。结果表明，果肉转色前AcF3H基因表达量较高，而转色初期表达量降低，此后随着果实着色加深表达量维持在较高水平。
