Brain tumors are a diverse group of malignancies that remain refractory to conventional treatment approaches.Molecular neuro-oncologyhas now begun to clarify the transformed phenotype of brain tumors and identify onco...Brain tumors are a diverse group of malignancies that remain refractory to conventional treatment approaches.Molecular neuro-oncologyhas now begun to clarify the transformed phenotype of brain tumors and identify oncogenic pathways that might be amenable to targetedtherapy.Activity of the phosphoinositide 3;kinase(PI3K)/Akt pathway is often upregulated in brain tumors due to excessive stimu-lation by growth factor receptors and Ras.Loss of function of the tumor suppressor gene PTEN also frequently contributesto展开更多
Photoacoustic technology in combination with molecular imaging is a highly effective method for accurately diagnosing brain glioma. For glioma detection at a deeper site, contrast agents with higher photoacoustic imag...Photoacoustic technology in combination with molecular imaging is a highly effective method for accurately diagnosing brain glioma. For glioma detection at a deeper site, contrast agents with higher photoacoustic imaging sensitivity are needed. Herein, we report a MoS_2–ICG hybrid with indocyanine green(ICG) conjugated to the surface of MoS_2 nanosheets. The hybrid significantly enhanced photoacoustic imaging sensitivity compared to MoS_2 nanosheets. This conjugation results in remarkably high optical absorbance across a broad near-infrared spectrum, redshifting of the ICG absorption peak and photothermal/photoacoustic conversion efficiency enhancement of ICG. A tumor mass of 3.5 mm beneath the mouse scalp was clearly visualized by using MoS_2–ICG as a contrast agent for the in vivo photoacoustic imaging of orthotopic glioma, which is nearly twofold deeper than the tumors imaged in our previous report using MoS_2 nanosheet. Thus, combined with its good stability and high biocompatibility, the MoS_2–ICG hybrid developed in this study has a great potential for high-efficiency tumor molecular imaging in translational medicine.展开更多
Objective Expressing the human matured brain-derived neurotrophic factor (mBDNF) gene in E. Coli and determining its bioactivity. Methods The resulting gene of mBDNF was subcloned into the EcoRI-BamHI site or the expr...Objective Expressing the human matured brain-derived neurotrophic factor (mBDNF) gene in E. Coli and determining its bioactivity. Methods The resulting gene of mBDNF was subcloned into the EcoRI-BamHI site or the expression vector plasmid pBV220. The ligation products were used to transform the competent E. Coli DH5a. The proteins or mBDNF were experessed by temperature inducing. The expression products were dealed with solubilizing inclusion bodies and refolding protein. It was introduced into the embryonic chicken DRG to test whether the expressed mBDNF is a biologically active protein. Results The recombinant plasmid pBV/mBDNF was success- fully constructed. By temperature inducing, under the control of the bacteriophage λPL promoter, the experessed mBDNF protein was a 14Kd non-fusion protein,which existed in E. Coli as inclusion bodies. The size or expressed mBDNF is identical to the prediction. Bioactivity of the products was proved that it could support the cell survival and neurite growth in the primary cultures of embryonic 8-day-old chicken DRG neurons as compared to control. Conclusion Tke mBDNF gene can be expressed bioactively in E. Coli.展开更多
The ability to use induced pluripotent stem cells（i PSC）to model brain diseases is a powerful tool for unraveling mechanistic alterations in these disorders.Rodent models of brain diseases have spurred understanding...The ability to use induced pluripotent stem cells（i PSC）to model brain diseases is a powerful tool for unraveling mechanistic alterations in these disorders.Rodent models of brain diseases have spurred understanding of pathology but the concern arises that they may not recapitulate the full spectrum of neuron disruptions associated with human neuropathology.iPSC derived neurons,or other neural cell types,provide the ability to access pathology in cells derived directly from a patient＇s blood sample or skin biopsy where availability of brain tissue is limiting.Thus,utilization of iPSC to study brain diseases provides an unlimited resource for disease modelling but may also be used for drug screening for effective therapies and may potentially be used to regenerate aged or damaged cells in the future.Many brain diseases across the spectrum of neurodevelopment,neurodegenerative and neuropsychiatric are being approached by iPSC models.The goal of an iPSC based disease model is to identify a cellular phenotype that discriminates the disease-bearing cells from the control cells.In this mini-review,the importance of iPSC cell models validated for pluripotency,germline competency and function assessments is discussed.Selected examples for the variety of brain diseases that are being approached by iPSC technology to discover or establish the molecular basis of the neuropathology are discussed.展开更多
A thermodynamic integration dual-transform method was firstly applied to calculating the relative hydration free energies of 99m TcO-N 2S 2 complexes. The relationship between the brain uptakes(B.U.) of ...A thermodynamic integration dual-transform method was firstly applied to calculating the relative hydration free energies of 99m TcO-N 2S 2 complexes. The relationship between the brain uptakes(B.U.) of 99m TcO-N 2S 2 complexes with different substituted functional groups and their relative hydration free energies was investigated. The simulation results show that the experiment brain uptake(B.U.) data are strongly influenced by the relative hydration free energies of 99m TcO-N 2S 2 complexes, thus the simulations can provide the useful information for the medicine design of 99m Tc brain imaging agents.展开更多
目的:利用中医传承辅助平台分析侯炜教授治疗脑胶质瘤的用药规律,并通过网络药理学方法探讨核心药组多成分-多靶点-多通路治疗脑胶质瘤的作用机制。方法:严格按照疗效判定标准筛选处方,利用关联规则分析显效及有效处方,在TCMSP数据库筛...目的:利用中医传承辅助平台分析侯炜教授治疗脑胶质瘤的用药规律,并通过网络药理学方法探讨核心药组多成分-多靶点-多通路治疗脑胶质瘤的作用机制。方法:严格按照疗效判定标准筛选处方,利用关联规则分析显效及有效处方,在TCMSP数据库筛选核心药组的有效成分及靶点,并与OMIM、TTD、GeneCard、DisGeNET数据库筛选所得脑胶质瘤基因取交集,得到候选靶点。借助Cytoscape 3.8.0构建“化合物-靶点-疾病”网络,在STRING平台构建PPI网络,设置拓扑参数筛选核心靶点。利用Metascape平台进行基因本体(gene ontology,GO)分析和京都基因与基因组百科全书(kyoto encyclopedia of genes and genomes,KEGG)富集分析,通过AutoDock Vina软件和Python脚本将核心化合物与核心靶点进行分子对接。结果:共纳入方剂249首,挖掘得到核心药物组合,并筛选活性成分227个,候选靶点30个,KEGG通路165条和GO功能739个。KEGG通路主要为丝裂原活化蛋白激酶(mitogen activated protein kinase,MAPK)信号通路、低氧诱导因子1(hypoxia inducible factor-1,HIF-1)信号通路、癌症相关信号通路。分子对接显示靶点与成分结合活性良好。结论:核心药组可能通过肿瘤蛋白P53、肿瘤坏死因子、MAPK1、MAPK8等靶标作用于MAPK信号通路、HIF-1信号通路及癌症相关信号通路等发挥作用。展开更多
文摘Brain tumors are a diverse group of malignancies that remain refractory to conventional treatment approaches.Molecular neuro-oncologyhas now begun to clarify the transformed phenotype of brain tumors and identify oncogenic pathways that might be amenable to targetedtherapy.Activity of the phosphoinositide 3;kinase(PI3K)/Akt pathway is often upregulated in brain tumors due to excessive stimu-lation by growth factor receptors and Ras.Loss of function of the tumor suppressor gene PTEN also frequently contributesto
基金National Natural Science Foundation of China (NSFC) Grants 91739117, 81522024, 81427804, 61405234, 81430038 and 61475182National Key Basic Research (973) Program of China Grant 2014CB744503 and 2015CB755500+3 种基金Guangdong Natural Science Foundation Grant 2014B050505013 and 2014A030312006Shenzhen Science and Technology Innovation Grant JCYJ20170413153129570, JCYJ20160531175040976, JCYJ 20150521144321005, JCYJ20160608214524052, JCYJ201604221 53149834 JCYJ20150731154850923SIAT Innovation Program for Excellent Young Researchers 201510
文摘Photoacoustic technology in combination with molecular imaging is a highly effective method for accurately diagnosing brain glioma. For glioma detection at a deeper site, contrast agents with higher photoacoustic imaging sensitivity are needed. Herein, we report a MoS_2–ICG hybrid with indocyanine green(ICG) conjugated to the surface of MoS_2 nanosheets. The hybrid significantly enhanced photoacoustic imaging sensitivity compared to MoS_2 nanosheets. This conjugation results in remarkably high optical absorbance across a broad near-infrared spectrum, redshifting of the ICG absorption peak and photothermal/photoacoustic conversion efficiency enhancement of ICG. A tumor mass of 3.5 mm beneath the mouse scalp was clearly visualized by using MoS_2–ICG as a contrast agent for the in vivo photoacoustic imaging of orthotopic glioma, which is nearly twofold deeper than the tumors imaged in our previous report using MoS_2 nanosheet. Thus, combined with its good stability and high biocompatibility, the MoS_2–ICG hybrid developed in this study has a great potential for high-efficiency tumor molecular imaging in translational medicine.
文摘Objective Expressing the human matured brain-derived neurotrophic factor (mBDNF) gene in E. Coli and determining its bioactivity. Methods The resulting gene of mBDNF was subcloned into the EcoRI-BamHI site or the expression vector plasmid pBV220. The ligation products were used to transform the competent E. Coli DH5a. The proteins or mBDNF were experessed by temperature inducing. The expression products were dealed with solubilizing inclusion bodies and refolding protein. It was introduced into the embryonic chicken DRG to test whether the expressed mBDNF is a biologically active protein. Results The recombinant plasmid pBV/mBDNF was success- fully constructed. By temperature inducing, under the control of the bacteriophage λPL promoter, the experessed mBDNF protein was a 14Kd non-fusion protein,which existed in E. Coli as inclusion bodies. The size or expressed mBDNF is identical to the prediction. Bioactivity of the products was proved that it could support the cell survival and neurite growth in the primary cultures of embryonic 8-day-old chicken DRG neurons as compared to control. Conclusion Tke mBDNF gene can be expressed bioactively in E. Coli.
文摘The ability to use induced pluripotent stem cells（i PSC）to model brain diseases is a powerful tool for unraveling mechanistic alterations in these disorders.Rodent models of brain diseases have spurred understanding of pathology but the concern arises that they may not recapitulate the full spectrum of neuron disruptions associated with human neuropathology.iPSC derived neurons,or other neural cell types,provide the ability to access pathology in cells derived directly from a patient＇s blood sample or skin biopsy where availability of brain tissue is limiting.Thus,utilization of iPSC to study brain diseases provides an unlimited resource for disease modelling but may also be used for drug screening for effective therapies and may potentially be used to regenerate aged or damaged cells in the future.Many brain diseases across the spectrum of neurodevelopment,neurodegenerative and neuropsychiatric are being approached by iPSC models.The goal of an iPSC based disease model is to identify a cellular phenotype that discriminates the disease-bearing cells from the control cells.In this mini-review,the importance of iPSC cell models validated for pluripotency,germline competency and function assessments is discussed.Selected examples for the variety of brain diseases that are being approached by iPSC technology to discover or establish the molecular basis of the neuropathology are discussed.
基金Supported by the NationalNaturalScience Foundation of China( No.30 170 2 30 ,10 174 0 0 5 and2 0 0 710 0 5 ) and BeijingNatural Science Foundation( No.5 0 32 0 0 2)
文摘A thermodynamic integration dual-transform method was firstly applied to calculating the relative hydration free energies of 99m TcO-N 2S 2 complexes. The relationship between the brain uptakes(B.U.) of 99m TcO-N 2S 2 complexes with different substituted functional groups and their relative hydration free energies was investigated. The simulation results show that the experiment brain uptake(B.U.) data are strongly influenced by the relative hydration free energies of 99m TcO-N 2S 2 complexes, thus the simulations can provide the useful information for the medicine design of 99m Tc brain imaging agents.
文摘目的:利用中医传承辅助平台分析侯炜教授治疗脑胶质瘤的用药规律,并通过网络药理学方法探讨核心药组多成分-多靶点-多通路治疗脑胶质瘤的作用机制。方法:严格按照疗效判定标准筛选处方,利用关联规则分析显效及有效处方,在TCMSP数据库筛选核心药组的有效成分及靶点,并与OMIM、TTD、GeneCard、DisGeNET数据库筛选所得脑胶质瘤基因取交集,得到候选靶点。借助Cytoscape 3.8.0构建“化合物-靶点-疾病”网络,在STRING平台构建PPI网络,设置拓扑参数筛选核心靶点。利用Metascape平台进行基因本体(gene ontology,GO)分析和京都基因与基因组百科全书(kyoto encyclopedia of genes and genomes,KEGG)富集分析,通过AutoDock Vina软件和Python脚本将核心化合物与核心靶点进行分子对接。结果:共纳入方剂249首,挖掘得到核心药物组合,并筛选活性成分227个,候选靶点30个,KEGG通路165条和GO功能739个。KEGG通路主要为丝裂原活化蛋白激酶(mitogen activated protein kinase,MAPK)信号通路、低氧诱导因子1(hypoxia inducible factor-1,HIF-1)信号通路、癌症相关信号通路。分子对接显示靶点与成分结合活性良好。结论:核心药组可能通过肿瘤蛋白P53、肿瘤坏死因子、MAPK1、MAPK8等靶标作用于MAPK信号通路、HIF-1信号通路及癌症相关信号通路等发挥作用。
