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Vitamin C induces periodontal ligament progenitor cell differentiation via activation of ERK pathway mediated by PELP1

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Protein & Cell 2013年第8期4卷 620-627页

作者： Yan Yan Wenfeng Zeng Shujun Song Fayun Zhang Wenxi He Wei Liang zhongying niu Department of Endodontics School of StomatologyFourth Military Medical UniversityXi’an710032China Protein and Peptide Pharmaceutical Laboratory Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Treatment Center of Oral Diseases the 306th Hospital of People’s Liberation ArmyBeijing 100101China Department of Pathology and Experimental Medicine the 306th Hospital of People’s Liberation ArmyBeijing 100101China

The differentiation of periodontal ligament(PDL)progenitor cells is important for maintaining the homeostasis of PDL tissue and alveolar bone.Vitamin C(VC),a water-soluble nutrient that cannot be biosynthesized by humans,is vital for mesenchymal stem cells differentiation and plays an important role in bone remodeling.Therefore,the objective of this study was to determine the function and mechanism of VC in PDL progenitor cells osteogenic differentiation at the molecular level.We demonstrated that VC could induce the osteogenic differentiation and maturation of PDL progenitor cell without other osteogenic agents.During the process,VC preferentially activated ERK1/2 but did not affect JNK or p38.Co-treatment with ERK inhibitor effectively decreased the Vitamin C-induced expression of Runx2.ERK inhibitor also abrogated Vitamin C-induced the minimized nodules formation.PELP1,a nuclear receptor co-regulator,was up-regulated under VC treatment.PELP1 knockdown inhibited ERK phosphorylation.The overexpression of PELP1 had a positive relationship with Runx2 expression.Taken together,we could make a conclude that VC induces the osteogenic differentiation of PDL progenitor cells via PELP1-ERK axis.Our fi nding implies that VC may have a potential in the regeneration medicine and application to periodontitis treatment.

关键词： periodontal ligament progenitor cells Vitamin C PELP1 ERK signaling pathway osteogenic differentiation

Electro-oxidation of Ni(Ⅱ)-citrate complexes at BDD electrode and simultaneous recovery of metallic nickel by electrodeposition

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Journal of Environmental Sciences 2022年第6期34卷 103-113页

作者： Qiongfang Zhuo Xiaofeng Xu Shuibo Xie Xiuwen Ren zhongying Chen Bo Yang Yanliang Li Junfeng niu School of Civil Engineering University of South ChinaHengyang 421001China School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China South China Institute of Environmental Sciences MEEGuangzhou 510655China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518071China

The simultaneous electro-oxidation of Ni(Ⅱ)-citrate and electrodeposition recovery of nickel metal were attempted in a combined electro-oxidation-electrodeposition reactor with a boron-doped diamond(BDD)anode and a polished titanium cathode.Effects of initial nickel citrate concentration,current density,initial p H,electrode spacing,electrolyte type,and initial electrolyte dosage on electrochemical performance were examined.The efficiencies of Ni(Ⅱ)-citrate removal and nickel metal recovery were determined to be 100%and over 72%,respectively,under the optimized conditions(10 m A/cm^(2),pH 4.09,80 mmol/L Na_(2)SO_(4),initial Ni(Ⅱ)-citrate concentration of 75 mg/L,electrode spacing of 1 cm,and 180 min of electrolysis).Energy consumption increased with increased current density,and the energy consumption was 0.032 kWh/L at a current density of 10 m A/cm^(2)(pH 6.58).The deposits at the cathode were characterized by scanning electron microscopy(SEM),energy-dispersive spectrometry(EDS),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).These characterization results indicated that the purity of metallic nickel in cathodic deposition was over 95%.The electrochemical system exhibited a prospective approach to oxidize metal complexes and recover metallic nickel.

关键词： Electrochemical oxidation Electrodeposition BDD anode Metal complexes Metallic nickel recovery

Upcycling PET in parallel with energy-saving H_(2)production via bifunctional nickel-cobalt nitride nanosheets

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Nano Research 2023年第4期16卷 4625-4633页

作者： Xuan Liu zhongying Fang Dengke Xiong Shuaiqi Gong Yanli niu Wei Chen Zuofeng Chen Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

We describe here an electro-reforming strategy to upcycle polyethylene terephthalate(PET)waste with simultaneous hydrogen production by a bifunctional nickel-cobalt nitride nanosheets electrocatalyst.PET plastics are digested in alkaline solution giving an electrochemically active monomer ethylene glycol(EG).The introduction of Co in Co-Ni3N/carbon cloth(CC)promotes the redox behavior of Ni2+/Ni3+,which is beneficial for EG oxidation at an ultra-low potential(1.15 V vs.reversible hydrogen electrode(RHE))and breaks through the limitation of high catalytic potentials of simple Ni-based electrocatalysts(1.30 V).In PET hydrolysate with Co-Ni3N/CC couples,an integrated EG oxidation-hydrogen production system achieves a current density of 50 mA·cm^(−2)at a cell voltage of 1.46 V,which is 370 mV lower than the conventional water splitting.The in-situ Raman and Fourier transform infrared(FTIR)spectroscopies and density functional theory(DFT)calculations identify the catalytic mechanism and point to advantages of heterostructure engineering in optimizing adsorption energies and promoting catalytic activities for EG oxidation.

关键词： nickel-cobalt nitride hydrogen evolution reaction polyethylene terephthalate upcycling ethylene glycol oxidation formic acid

^(64)Cu radiolabeled nanomaterials for positron emission tomography(PET)imaging

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Chinese Chemical Letters 2022年第7期33卷 3349-3360页

作者： Xueqian Chen Wenchao niu zhongying Du Yong Zhang Dongdong Su Xueyun Gao Department of Chemistry and Biology Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

The prevalence of positron emission tomography(PET)imaging has advanced biomedical applications for its ultrahigh sensitivity,deep tissue penetration and quantitative visualization of diseases in vivo.^(64)Cu with ideal half-life and decay characteristics has been designed as radioactive probes for disease diagnosis.The currently reported ^(64)Cu-labeled nanomaterials have the advantages of long circulation time in serum,good biocompatibility and mature preparation methods,and have been used in vivo PET imaging,biodistribution and pharmacokinetic monitoring,and imaging guided therapy.At the same time,suitable carrier characteristics and radiolabeling strategies are particularly important in the ^(64)Cu PET imaging process.In this review,we summarize different imaging probe designs and ^(64)Cu radiolabeling strategies,as well as their eventual applications in biomedicine.The potential challenges and prospects of ^(64)Cu labeled nanomaterials are also described,which provides broad prospects for radiolabeling strategies and further applications.

关键词： ^(64)Cu Positron emission tomography Chelating agent-free Radiolabeling strategies Imaging guided therapy

Paired formate and H_(2) productions via efficient bifunctional Ni-Mo nitride nanowire electrocatalysts

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Journal of Energy Chemistry 2022年第9期31卷 432-441,I0012页

作者： Xuan Liu zhongying Fang Xue Teng Yanli niu Shuaiqi Gong Wei Chen Thomas JMeyer Zuofeng Chen Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina Department of Chemistry University of North Carolina at Chapel HillChapel HillNC 27599United States

Electrocatalytic water splitting provides a potentially sustainable approach for hydrogen production,but is typically restrained by kinetically slow anodic oxygen evolution reaction(OER)which is of lesser value.Here,free-standing,hetero-structured Ni_(3)N-Ni_(0.2)Mo_(0.8)N nanowire arrays are prepared on carbon cloth(CC)electrodes for hydrogen evolution reaction(HER)and glycerol oxidation reaction(GOR)to formate with a remarkably high Faradaic efficiency of 96%.A two-electrode electrolyzer for GOR-assisted hydrogen production operates with a current density of 10 mA cm^(-2)at an applied cell voltage of 1.40 V,220 mV lower than for alkaline water splitting.In-situ Raman measurements identify Ni(Ⅲ)as the active form of the catalyst for GOR rather than Ni(IV)and in-situ Fourier transform infrared(FTIR)spectroscopy measurements reveal pathways for GOR to formate.From density functional theory(DFT)calculations,the Ni_(3)N-Ni_(0.2)Mo_(0.8)N heterostructure is beneficial for optimizing adsorption energies of reagents and intermediates and for promoting HER and GOR activities by charge redistribution across the heterointerface.The same electrode also catalyzes conversion of ethylene glycol from polyethylene terephthalate(PET)plastic hydrolysate into formate.The combined results show that electrolytic H_(2) and formate production from alkaline glycerol and ethylene glycol solutions provide a promising strategy as a cost-effective energy supply.

关键词： Transition metal nitrides Heterostructures Hydrogen evolution reaction Glycerol and ethylene glycol oxidation Formic acid

Broken electron transfer pathway in enzyme:Gold clusters inhibiting TrxR1/Trx via cell studies and theory simulations

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Chinese Chemical Letters 2022年第7期33卷 3488-3491页

作者： Wenchao niu zhongying Du Chunyu Zhang Deting Xu Jiaojiao Li Minghui Sun Liyuan Wu Haodong Yao Lina Zhao Xueyun Gao Department of Chemistry and Biology Beijing University of TechnologyBeijing 100124China CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Thioredoxin reductase 1(TrxR1)is over activity in tumor cell to maintain their redox balance.Although gold clusters have great potential in antitumor drug as they could well inhibit TrxR1,the molecular mechanism has not been disclosed yet.In this work,we revealed gold clusters can well inhibit the activity of TrxR1 in lung tumor cells and further disclosed the inhibition mechanism by using computational simulation methods.We firstly inferred the binding sites of gold in the hydrophobic cavities on TrxR1.The simulation results show that the gold ion(released from Au cluster)interact with–SH of Cys189 in TrxR1,this greatly increase the distance between the C-terminal redox center of TrxR1 and the Trx redox center,thereby destroy the electron transfer pathway between them.Our electron transfer destroying mechanism is different from the previous hypothesis that gold binds to the Sec498 of TrxR1 which has never been proved by experimental and theory studies.This work provides a new understanding of the gold clusters to inhibit TrxR1 activity.

关键词： Enzyme inhibition Electron transfer Thioredoxin reductase 1 Gold clusters Molecular dynamics Density functional theory

Integrating polygenic and clinical risks to improve stroke risk stratification in prospective Chinese cohorts

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Science China(Life Sciences) 2023年第7期66卷 1626-1635页

作者： Qingmei Cui Fangchao Liu Jianxin Li Xiaoge niu zhongying Liu Chong Shen Dongsheng Hu Keyong Huang Shufeng Chen Jie Cao Xiaoqing Liu Ling Yu Fanghong Lu Xianping Wu Liancheng Zhao Jianfeng Huang Ying Li Zhibin Hu Hongbing Shen Dongfeng Gu Xiangfeng Lu Department of Epidemiology Fuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing100037China Key Laboratory of Cardiovascular Epidemiology Chinese Academy of Medical SciencesBeijing100037China Department of Nephrology Henan Provincial Key Laboratory of Kidney Disease and ImmunologyHenan Provincial Clinical Research Center for Kidney DiseaseHenan Provincial People’s Hospital and People’s Hospital of Zhengzhou UniversityZhengzhou450053China Department of Epidemiology and Biostatistics Center for Global HealthSchool of Public HealthNanjing Medical UniversityNanjing211166China Department of Epidemiology and Health Statistics College of Public HealthZhengzhou UniversityZhengzhou450001China Department of Prevention Medicine Shenzhen University School of MedicineShenzhen518060China Division of Epidemiology Guangdong Provincial People’s Hospital and Cardiovascular InstituteGuangzhou510080China Department of Cardiology Fujian Provincial People’s HospitalFuzhou350014China Cardio-Cerebrovascular Control and Research Center Institute of Basic MedicineShandong Academy of Medical SciencesJinan250062China Sichuan Center for Disease Control and Prevention Chengdu610041China Research Units of Cohort Study on Cardiovascular Diseases and Cancers Chinese Academy of Medical SciencesBeijing100730China School of Medicine Southern University of Science and TechnologyShenzhen518055China

The utility of the polygenic risk score(PRS)to identify individuals at higher risk of stroke beyond clinical risk remains unclear,and we clarified this using Chinese population-based prospective cohorts.Cox proportional hazards models were used to estimate the 10-year risk,and Fine and Gray’s models were used for hazard ratios(HRs),their 95%confidence intervals(CIs),and the lifetime risk according to PRS and clinical risk categories.A total of 41,006 individuals aged 30–75 years with a mean follow-up of 9.0 years were included.Comparing the top versus bottom 5%of the PRS,the HR was 3.01(95%CI 2.03–4.45)in the total population,and similar findings were observed within clinical risk strata.Marked gradients in the 10-year and lifetime risk across PRS categories were also found within clinical risk categories.Notably,among individuals with intermediate clinical risk,the 10-year risk for those in the top 5%of the PRS(7.3%,95%CI 7.1%–7.5%)reached the threshold of high clinical risk(≥7.0%)for initiating preventive treatment,and this effect of the PRS on refining risk stratification was evident for ischemic stroke.Even among those in the top 10%and 20%of the PRS,the 10-year risk would also exceed this level when aged≥50 and≥60 years,respectively.Overall,the combination of the PRS with the clinical risk score improved the risk stratification within clinical risk strata and distinguished actual high-risk individuals with intermediate clinical risk.

关键词： stroke polygenic risk score clinical risk score utility stratification

PELP1 protein and the estrogen non-genomic signaling pathway

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Chinese Science Bulletin 2013年第1期58卷 44-47页

作者： WANG Jing SHI Liang SONG ShuJun ZHU Qiang DING Yin niu zhongying Department of Orthodontics Hospital of StomatologyFourth Military Medical University Department of Stomatology 306 Hospital of People's Liberation Army Center for Experimental Medicine 306 Hospital of the People's Liberation Army Department of Urology General Hospital of the Chinese People's Liberation Army

Estrogen exerts its biological effects through two signal pathways,the genomic and non-genomic pathway,both of which contribute to cell homeostasis.The non-genomic pathway has been suggested to be important in estrogen-induced cardio-,neuron-,and osteoprotection,and confers the ability of the cell to rapidly respond to its environment.The effects of the non-genomic pathway are the regulation of different cellular processes,such as proliferation,survival,apoptosis,and other functions in diverse cell-types.The proline-,glutamic acid-,and leucine-rich protein 1(PELP1),is now known as a modulator of the estrogen receptors,and is also a novel coregulator of the non-genomic signal pathway with various functions.Therefore,the evaluation of the molecular crosstalk between PELP1 and the non-genomic pathway may lead to the development of functionally selective estrogen receptor modulators which can participate in the multiple functions of estrogen signaling in reproductive tissues and other organs.

关键词：选择性雌激素受体调节剂信号通路 P1蛋白基因组 PEL 细胞凋亡生物学作用激素诱导

模拟失重及高+Gx暴露对猴腮腺组织腮腺分泌蛋白表达的影响

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航天医学与医学工程 2020年第2期33卷 102-106页

作者：郭杨牛忠英刘彦天津市口腔医院天津300041 战略支援部队特色医学中心口腔科北京100101

目的研究头低位卧床模拟失重30d及高+Gx暴露后猕猴腮腺组织腮腺分泌蛋白(PSP)表达的变化,探讨长时间失重及高+Gx暴露对腮腺分泌功能的影响。方法23只猕猴随机分为4组:正常对照组(A组,3只);模拟失重30d组(B组,3只);+13Gx/230s暴露组(C组,... 详细信息

目的研究头低位卧床模拟失重30d及高+Gx暴露后猕猴腮腺组织腮腺分泌蛋白(PSP)表达的变化,探讨长时间失重及高+Gx暴露对腮腺分泌功能的影响。方法23只猕猴随机分为4组:正常对照组(A组,3只);模拟失重30d组(B组,3只);+13Gx/230s暴露组(C组,3只);模拟失重30d后高+Gx暴露组(D组,14只)。D组依据+Gx值又分为4个亚组,分别是+11Gx/270s暴露组(D1组,3只),+13Gx/230s暴露组(D2组,4只),+15Gx/200s暴露组(D3组,4只),+13Gx/230s暴露后恢复9d组(D4组,3只)。猕猴-10°头低位卧床建立失重模型,使用58型动物离心机建立高+Gx暴露模型。利用实时定量PCR(qRT-PCR)和蛋白印迹法(Western blot)检测猕猴腮腺组织PSP在mRNA及蛋白水平表达变化。结果与对照组相比,各实验组猕猴腮腺组织PSP蛋白和mRNA表达显著减少。失重30d后高+13Gx较单纯高+13Gx组相比,PSP表达显著减少(P<0.01)。模拟失重后再高+Gx暴露,猕猴腮腺组织PSP表达呈现随+Gx值增大而减弱的趋势,而恢复9d后表达回升。结论模拟失重30d及高+Gx暴露导致猕猴腮腺组织PSP表达降低,腮腺分泌免疫因子的功能受到影响。模拟失重降低了腮腺的超重耐受力,腮腺的损伤有可逆性。

关键词：失重模拟超重腮腺腮腺分泌蛋白