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Akt-centered amplification loop plays a critical role in vascular endothelial growth factor/stromal cell-derived factor 1-αcross-talk and cardioprotection

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Chinese Medical Journal 2011年第22期124卷 3800-3805页

作者： GUO Wen-yi zhang dian-xin LI Wei-jie ZHAO Zhi-jing LIU Bing WANG Hai-chang LI Fei Department of Cardiology Xijing Hospital Fourth Military Medical University Xi＇an Shaanxi 710032 China

Background Vascular endothelial growth factor （VEGF） is one of major mediators of angiogenesis and survival factor in some tissue, however, its direct effects on cardiomyocytes remain poorly understood. Methods Rat neonatal ventricular myocytes were cultured in vitro. Akt phosphorylation was measured by Western blotting; the expression of stromal cell-derived factor α（SDF-1α）/CXCR4 axis was evaluated by real-time PCR and Western blotting. LY294002 and AMD3100 were used to interfere with the signaling of VEGF and SDF-1α/CXCR4 axis. Cardiac myocytes viability and injury were evaluated by trypan blue staining and lactate dehydrogenase （LDH） release. Results Treatment of neonatal rat ventricular myocytes with VEGF induced phosphorylation of Akt in a dose and FIk-1 dependent manner. VEGF attenuated H202 induced cardiac myocyte death. The phosphoinositol-3-kinase （PI3K） inhibitor, LY294002 and FIk-1 antibody abolished the beneficial effects of VEGF on H202 induced cell death. In the mean time SDF-1α-CXCR4 axis was up-regulated by VEGF through PI3K-Akt signaling and contributed to the protective effects of VEGF on H202 induced cell death. Interestingly, SDF-1α also promoted production of VEGF in cultured cardiac myocytes and LY294002 reversed the up-reguLation of VEGF induced by SDF-1α. Conclusion VEGF has direct protective effects on cardiomyocytes; a crosstalk between VEGF and SDF-1α through PI3K-Akt serves a survival role in cardiomvocvtes in vitro.

关键词： vascular endothelial growth factor cardiomyocyte, stromal cell-derived factor a survival PI3K-Akt

一种改善了非线性和色散性的Boussinesq方程模型

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应用数学和力学 2008年第7期29卷 813-824页

作者：张殿新陶建华天津大学机械工程学院力学系天津300072

推导了一种在不平底上的新的Boussinesq方程.在不增加方程的最高导数项的阶数的情况下提高了模型方程的非线性.为了提高模型的色散性,引入长波近似,通过调节待定系数来使模型的色散性达到Padé(2,2).对模型方程进行了非线性、线性色散... 详细信息

推导了一种在不平底上的新的Boussinesq方程.在不增加方程的最高导数项的阶数的情况下提高了模型方程的非线性.为了提高模型的色散性,引入长波近似,通过调节待定系数来使模型的色散性达到Padé(2,2).对模型方程进行了非线性、线性色散性和线性浅化性分析,分析表明此模型在非线性、色散性和浅化性上都有所提高.将计算结果与实验数据做了比较,结果显示模型更好的符合了实验数据.

关键词： Boussinesq方程改进非线性色散性

Bilevel Optimal Scheduling of Island Integrated Energy System Considering Multifactor Pricing

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Energy Engineering 2025年第1期122卷 349-378页

作者： xin zhang Mingming Yao Daiwen He Jihong zhang Peihong Yang Xiaoming zhang School of Automation and Electrical Engineering Inner Mongolia University of Science and TechnologyBaotou014010China

In this paper,a bilevel optimization model of an integrated energy operator(IEO)–load aggregator(LA)is constructed to address the coordinate optimization challenge of multiple stakeholder island integrated energy system(IIES).The upper level represents the integrated energy operator,and the lower level is the electricity-heatgas load *** to the benefit conflict between the upper and lower levels of the IIES,a dynamic pricing mechanism for coordinating the interests of the upper and lower levels is proposed,combined with factors such as the carbon emissions of the IIES,as well as the lower load interruption *** price of selling energy can be dynamically adjusted to the lower LA in the mechanism,according to the information on carbon emissions and load interruption *** benefits and win-win situations are achieved between the upper and lower ***,CPLEX is used to iteratively solve the bilevel optimization *** optimal solution is selected according to the joint optimal discrimination *** results indicate that the sourceload coordinate operation can reduce the upper and lower operation *** the proposed pricingmechanism,the carbon emissions and load interruption power of IEO-LA are reduced by 9.78%and 70.19%,respectively,and the capture power of the carbon capture equipment is improved by 36.24%.The validity of the proposed model and method is verified.

关键词： Bilevel optimal scheduling load aggregator integrated energy operator carbon emission dynamic pricing mechanism

Gradient‑Layered MXene/Hollow Lignin Nanospheres Architecture Design for Flexible and Stretchable Supercapacitors

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Nano-Micro Letters 2025年第2期17卷 447-462页

作者： Haonan zhang Cheng Hao Tongtong Fu dian Yu Jane Howe Kaiwen Chen Ning Yan Hao Ren Huamin Zhai Jiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass Materials NanJing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering and Applied Chemistry University of Toronto200 College StreetTorontoON M5S 3E5Canada Department of Materials Science and Engineering University of Toronto184 College StreetTorontoON M5S 3E4Canada College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China

With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has *** this work,a novel gradient-layered architecture was design based on single-pore hollow lignin nanospheres(HLNPs)-intercalated two-dimensional transition metal carbide(Ti_(3)C_(2)T_(x) MXene)for fabricating highly stretchable and durable *** depositing and inserting HLNPs in the MXene layers with a bottom-up decreasing gradient,a multilayered porous MXene structure with smooth ion channels was constructed by reducing the overstacking of MXene ***,the micro-chamber architecture of thin-walled lignin nanospheres effectively extended the contact area between lignin and MXene to improve ion and electron accessibility,thus better utilizing the pseudocapacitive property of *** these strategies effectively enhanced the capacitive performance of the *** addition,HLNPs,which acted as a protective phase for MXene layer,enhanced mechanical properties of the wrinkled stretchable electrodes by releasing stress through slip and deformation during the stretch-release cycling and greatly improved the structural integrity and capacitive stability of the *** electrodes and symmetric flexible all-solid-state supercapacitors capable of enduring 600%uniaxial tensile strain were developed with high specific capacitances of 1273 mF cm^(−2)(241 F g^(−1))and 514 mF cm^(−2)(95 F g^(−1)),***,their capacitances were well preserved after 1000 times of 600%stretch-release *** study showcased new possibilities of incorporating biobased lignin nanospheres in energy storage devices to fabricate stretchable devices leveraging synergies among various two-dimensional nanomaterials.

关键词： Hollow lignin nanospheres MXene Gradient-layered architecture Wrinkled electrodes Stretchable supercapacitors

Nitric oxide induces heat shock protein 72 production and delayed protection against myocardial ischemia in rabbits via activating protein kinase C

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Chinese Medical Journal 2008年第12期121卷 1109-1113页

作者： LI Wei-jie ZHAO Zhi-jing LIU Bing zhang dian-xin LI Fei WANG Hai-chang GUO Wen-yi JIA Guo-liang Masafumi Kitakaze Masatsugu Hori Department of Cardiology Xijing Hospital Fourth Military Medical University Xi'an Shaanxi 710033 China First Department of Medicine Osaka University School of Medicine Suita 565 Japan

Background Nitric oxide （NO） is a biologically active molecule which has been reported to protect the heart against ischemia and reperfusion injury in different species. This study aimed to test the hypothesis that nitric oxide may induce the expression of heat shock protein 72 （HSP72） which may protect the heart against ischemia.Methods Rabbits were given intravenous saline or S-nitroso-N-acetylpenicillamine （SNAP）, a nitric oxide donor, or Zaprinast, an inhibitor of cyclic guanosine monophosphate （GMP）-phosphodiesterase, which may increase myocardial cyclic GMP content. Twenty-four hours later, the rabbits were either sampled to measure HSP72, or induced with a 30-minute coronary occlusion followed by a 120-minute reperfusion, and then the infarct size was measured. Meanwhile, chelerythrine （CHE, an inhibitor of protein kinase C） was given intravenously 5 minutes before SNAP injection and the effect on HSP72 expression and infarct size was determined.Results Twenty-four hours after pretreatment, immunoblotting showed HSP72 expression increased in the SNAP group compared with control groups, and this was blocked by CHE. Myocardial infarct size in the SNAP group was smaller than that of the control group （（32.4±5.8）% vs （51.1±4.7）%, P 〈0.05）. Pretreated with CHE abolished the infarct size-limiting effect of SNAP （（46.0±5.1）%）. Pretreatment with Zaprinast neither induced HSP72 expression nor reduced infarct size （（55.4±5.4）%）.Conclusion NO induced HSP72 expression and a delayed protection to the heart via the activities of protein kinase C by a cyclic GMP-independent pathway.

关键词： nitric oxide heat shock protein 72 protein kinase C myocardial infarction

Defect Engineering:Can it Mitigate Strong Coulomb Effect of Mg^(2+)in Cathode Materials for Rechargeable Magnesium Batteries?

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Nano-Micro Letters 2025年第1期17卷 135-159页

作者： Zhengqing Fan Ruimin Li xin zhang Wanyu Zhao Zhenghui Pan Xiaowei Yang School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China School of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China School of Materials Science and Engineering Tongji UniversityShanghai 201804People’s Republic of China

Rechargeable magnesium batteries(RMBs)have been considered a promising“post lithium-ion battery”system to meet the rapidly increasing demand of the emerging electric vehicle and grid energy storage ***,the sluggish diffusion kinetics of bivalent Mg^(2+)in the host material,related to the strong Coulomb effect between Mg^(2+)and host anion lattices,hinders their further development toward practical *** engineering,regarded as an effective strategy to break through the slow migration puzzle,has been validated in various cathode materials for *** this review,we first thoroughly understand the intrinsic mechanism of Mg^(2+)diffusion in cathode materials,from which the key factors affecting ion diffusion are further ***,the positive effects of purposely introduced defects,including vacancy and doping,and the corresponding strategies for introducing various defects are *** applications of defect engineering in cathode materials for RMBs with advanced electrochemical properties are also ***,the existing challenges and future perspectives of defect engineering in cathode materials for the overall high-performance RMBs are described.

关键词： Rechargeable magnesium battery Sluggish diffusion kinetic Defect engineering Cathode materials Ion migration

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后进生转化之探究与实践

教育教学论坛 2017年第10期 163-164页

作者：张店新山东省青岛市黄岛区滨海中学山东青岛266404

不管是城市还是乡镇,不管是小学还是初中,都会在发展过程中出现不同类型的后进生,因此后进生的转化是学校教育工作的主题,能否快速有效地转化后进生是改善教学质量的关键环节。转化后进生工作是实施素质教育的内容之一,是学校工作的重... 详细信息

不管是城市还是乡镇,不管是小学还是初中,都会在发展过程中出现不同类型的后进生,因此后进生的转化是学校教育工作的主题,能否快速有效地转化后进生是改善教学质量的关键环节。转化后进生工作是实施素质教育的内容之一,是学校工作的重中之重。教师全面做好转化后进生工作,班主任规范转化后进生工作管理,不但关系到一个班良好学习氛围的形成,也关系到全班的合格率,所以如何转化后进生工作,是摆在我们面前的最突出、最应该注意的问题。本文从后进生含义简述的基础上,结合实际分析了对后进生转化的一些方法。

关键词：后进生温暖自信

α-SMA与瓣膜性心房颤动患者心房纤维化的关系

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西安交通大学学报（医学版） 2017年第2期38卷 242-246页

作者：潘军强张殿新孙超峰杨进西北大学生命科学学院预防基因组医学研究所陕西西安710069 第四军医大学附属西京医院心血管内科陕西西安710032 西安交通大学第一附属医院心血管内科陕西西安710061

目的研究α-SMA在瓣膜性心房颤动(AF)患者心房组织中的表达及其与心房纤维化的关系。方法选择因风湿性心脏瓣膜病住院并行瓣膜置换手术的患者84例(AF组39例、窦性心律组45例),收集整理患者的临床资料,并于手术中获取右心房组织(0.3~0.5c... 详细信息

目的研究α-SMA在瓣膜性心房颤动(AF)患者心房组织中的表达及其与心房纤维化的关系。方法选择因风湿性心脏瓣膜病住院并行瓣膜置换手术的患者84例(AF组39例、窦性心律组45例),收集整理患者的临床资料,并于手术中获取右心房组织(0.3~0.5cm3)。Masson染色观察两组患者右心房纤维化程度;Western blot及RTqPCR技术测定心房组织中α-SMA蛋白及mRNA的表达,相关分析探讨α-SMA与心房纤维化的关系。结果两组患者的性别构成比、年龄、血压、血常规、生化指标等差异无统计学意义(P>0.05),AF组左、右心房直径明显大于窦性心律组(P<0.05);Masson染色结果提示,AF组心房组织存在明显纤维化,且胶原容积分数与胶原含量显著高于窦性心律组(P<0.05);AF组患者心房组织α-SMA的mRNA及蛋白表达均显著高于窦性心律组(P<0.05);84例患者右心房组织中α-SMA的mRNA及蛋白表达量均与胶原含量呈正相关(相关系数分别为0.587、0.607;P值分别为0.029、0.014)。结论瓣膜性AF患者心房组织存在明显的心房纤维化,与α-SMA基因转录水平上调密切相关。

关键词：风湿性心脏瓣膜病心房颤动心房纤维化心房重塑 α-平滑肌肌动蛋白(α-SMA)

Comparative proteomic analysis of plasma exosomes reveals the functional contribution of N-acetyl-alpha-glucosaminidase to Parkinson’s disease

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Neural Regeneration Research 2025年第10期20卷 2998-3012页

作者： Yuan Zhao Yidan zhang xin Liu Jian zhang Ya Gao Shuyue Li Cui Chang Xiang Liu Guofeng Yang Department of Geriatrics Second Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Department of Neurosurgery The Second Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina

Parkinson’s disease is the second most common progressive neurodegenerative disorder,and few reliable biomarkers are available to track disease *** proteins,DNA,mRNA,and lipids carried by exosomes reflect intracellular changes,and thus can serve as biomarkers for a variety of *** this study,we investigated alterations in the protein content of plasma exosomes derived from patients with Parkinson’s disease and the potential therapeutic roles of these proteins in Parkinson’s *** a tandem mass tag-based quantitative proteomics approach,we characterized the proteomes of plasma exosomes derived from individual patients,identified exosomal protein signatures specific to patients with Parkinson’s disease,and identified N-acetyl-alpha-glucosaminidase as a differentially expressed protein.N-acetyl-alpha-glucosaminidase expression levels in exosomes from the plasma of patients and healthy controls were validated by enzyme-linked immunosorbent assay and western *** results demonstrated that the exosomal N-acetyl-alpha-glucosaminidase concentration was not only lower in Parkinson’s disease,but also decreased with increasing Hoehn-Yahr stage,suggesting that N-acetyl-alpha-glucosaminidase could be used to rapidly evaluate Parkinson’s disease ***,western blot and immunohistochemistry analysis showed that N-acetyl-alpha-glucosaminidase levels were markedly reduced both in cells treated with 1-methyl-4-phenylpyridinium and cells overexpressingα-synuclein compared with control ***,N-acetyl-alpha-glucosaminidase overexpression significantly increased cell viability and inhibitedα-synuclein expression in 1-methyl-4-phenylpyridinium-treated *** together,our findings demonstrate for the first time that exosomal N-acetyl-alpha-glucosaminidase may serve as a biomarker for Parkinson’s disease diagnosis,and that N-acetyl-alpha-glucosaminidase may reduceα-synuclein expression and 1-methyl-4-phenylpyridinium-induced n

关键词： biomarker diagnosis exosomes N-acetyl-alpha-glucosaminidase Parkinson’s disease proteomic α-synuclein