基于eNSP、VirtualBox和Kali的DHCP多层次闯关实验设计

动态主机配置协议(DHCP)是管理和分配IP地址的协议,在企业网中广泛使用。针对学生在学习过程中缺乏动手实践能力的训练以及计算机网络设备硬件有限的问题,提出了一种综合使用eNSP、VirtualBox、Kali软件搭建DHCP多层次实验项目。实验项目的设计涵盖了常见DHCP服务器的配置、DHCP中继、DHCP攻击与防御方面的内容。通过本实验项目的设计能够提升学生的网络工程实践能力,方便教师开展线上教学,提升教学质量。

远隔缺血后适应治疗对急性缺血性卒中超时间窗患者临床预后的影响:一项随机对照试验

背景急性缺血性卒中(AIS)高发,及时恢复脑血流是治疗的关键,超时间窗就诊患者无更多促进脑血流恢复的治疗手段。研究远隔缺血后适应(RIPostC)治疗对AIS超时间窗就诊患者的临床疗效、并发症和预后,具有重要的临床意义。目的探究RIPostC治疗对AIS超时间窗患者干预的影响,为超时间窗就诊的AIS患者寻求安全、有效的脑血流恢复治疗方式。方法本研究采用随机、分组、安慰剂对照法进行试验。选取2021-09-02—2022-08-31于北京航天总医院神经内科病房住院治疗的超溶栓时间窗(发病时间>6 h)的AIS患者为研究对象。依据随机数字表法将患者分为对照组和试验组。试验期+随访期共90 d,均使用同等的一般治疗、脑血管病常规治疗,试验组在此基础上给予RIPostC治疗14 d(28次),对照组给予模拟的RIPostC治疗14 d(28次)。在干预前和干预后30 d、干预后90 d,采用改良Rankin量表(mRS)、美国国立卫生研究院卒中量表(NIHSS)评估两组患者神经功能,简易精神状态检查量表(MMSE)、蒙特利尔认知评估量表(MoCA)评估患者认知功能,工具性日常生活能力量表(IADL)评估日常生活能力,焦虑自评量表(SAS)、抑郁自评量表(SDS)评估精神状态,经颅多普勒超声(TCD)评估脑血流速度,以白介素(IL)-6反映炎症情况。结果122例患者中,最终完成试验及随访99例,其中试验组49例,对照组50例。两组患者性别、年龄、基础疾病(高血压、糖尿病、冠心病)及基线NIHSS评分比较,差异无统计学意义(P>0.05)。重复测量方差分析结果示,时间与组别对MMSE、MoCA、mRS、NIHSS、脑血流速度、IL-6存在交互作用(P<0.05),时间和组别对MMSE、MoCA、NIHSS、脑血流速度、IL-6主效应显著(P<0.05),时间对mRS、SAS、SDS、IADL主效应显著(P<0.05)。试验组干预后30、90 d MMSE、MoCA评分及脑血流速度均高于对照组,mRS、NIHSS评分均低于对照组(P<0.05);试验组干预后30、90 d SDS、IADL评分低于对照组(P<0.05);试验组干预后30 d SAS评分高于对照组,IL-6低于对照组(P<0.05)。99例患者中共有23例患者发生不良反应,其中试验组17例,对照组6例,两组皮肤瘀点、头晕、心慌、胸闷发生率比较,差异无统计学意义(P>0.05);对照组患者皮肤瘀斑发生率[4.00%(2/50)与12.24%(6/49)]、总不良反应发生率[12.00%(6/50)与34.69%(17/49)]低于试验组(P<0.05)。结论RIPostC治疗可降低AIS患者的炎症反应,对神经功能、认知功能抑郁情绪及颅内血流速度可起到积极的改善效果。

医疗机构药品风险管理认知与现状调研

目的了解我国医疗机构药学人员在药品使用过程中对药品风险管理工作的认知和现状,为促进医疗机构药品风险管理体系的完善与发展提供经验和建议。方法采用问卷调查法,面向全国28个省(区、市),采用分层随机抽样,以全国医疗机构的医务工作者、医疗相关药学从业人员群体为研究对象,调查内容包括调查人群信息,医疗机构药品风险管理实施现状,药品风险管理相关概念的认知、含义与流程,医疗机构药品风险管理工作内容及模式;最后,收集完善医疗机构药品风险管理体系建设的建议。采用描述性统计分析对所得数据进行汇总。结果本次调研共回收问卷446份,其中有效问卷420份,无效问卷26份,问卷回收率为100%,有效率为94.17%。51.19%的参研人员对医疗机构药品风险管理认知来源于《药品不良反应报告和监测管理办法》;87.38%的参研人员支持医疗机构药品风险管理的管理范围包括药品使用的全流程。63.33%的参研人员表示自己所在医疗机构设立了医疗机构药品风险管理相关岗位,其中三级甲等及以上医疗机构占比最高(72.17%)。66.43%的参研人员反馈在药品使用全部环节均进行药品风险管理。参研人员针对医疗机构药品风险管理体系发展的建议重点集中在完善制度指导性文件、明确概念内涵、建立信息共享机制等方面。结论目前我国医疗机构药品风险管理总体认知水平较高,其工作正在多环节、多形式地实施开展,但仍需加强相关制度文件、管理规范和体系建设,进一步完善信息共享机制,促进风险管理的社会共治和协作,提高药品管理水平,保障患者用药安全。

High formability Mg-Zn-Gd wire facilitates ACL reconstruction via its swift degradation to accelerate intra-tunnel endochondral ossification

After reconstructing the anterior cruciate ligament(ACL),unsatisfactory bone tendon interface healing may often induce tunnel enlargement at the early healing stage.With good biological features and high formability,Magnesium-Zinc-Gadolinium(ZG21)wires are developed to bunch the tendon graft for matching the bone tunnel during transplantation.Microstructure,tensile strength,degradation,and cytotoxicity of ZG21 wire are evaluated.The rabbit model is used for assessing the biological effects of ZG21 wire by Micro-CT,histology,and mechanical test.The SEM/EDS,immunochemistry,and in vitro assessments are performed to investigate the underlying mechanism.Material tests demonstrate the high formability of ZG21 wire as surgical suture.Micro-CT shows ZG21 wire degradation accelerates tunnel bone formation,and histologically with earlier and more fibrocartilage regeneration at the healing interface.The mechanical test shows higher ultimate load in the ZG21 group.The SEM/EDS presents ZG21 wire degradation triggered calcium phosphate(Ca-P)deposition.IHC results demonstrate upregulation of Wnt3a,BMP2,and VEGF at the early phase and TGFβ3 and Type II collagen at the late phase of healing.In vitro tests also confirmed the Ca-P in the metal extract could elevate the expression of Wnt3a,βcatenin,ocn and opn to stimulate osteogenesis.Ex vivo tests of clinical samples indicated suturing with ZG21 wire did not weaken the ultimate loading of human tendon tissue.In conclusion,the ZG21 wire is feasible for tendon graft bunching.Its degradation products accelerated intra-tunnel endochondral ossification at the early healing stage and therefore enhanced bone-tendon interface healing in ACL reconstruction.

A linkable signature scheme supporting batch verification for privacy protection in crowd-sensing

The maturity of 5G technology has enabled crowd-sensing services to collect multimedia data over wireless network,so it has promoted the applications of crowd-sensing services in different fields,but also brings more privacy security challenges,the most commom which is privacy leakage.As a privacy protection technology combining data integrity check and identity anonymity,ring signature is widely used in the field of privacy protection.However,introducing signature technology leads to additional signature verification overhead.In the scenario of crowd-sensing,the existing signature schemes have low efficiency in multi-signature verification.Therefore,it is necessary to design an efficient multi-signature verification scheme while ensuring security.In this paper,a batch-verifiable signature scheme is proposed based on the crowd-sensing background,which supports the sensing platform to verify the uploaded multiple signature data efficiently,so as to overcoming the defects of the traditional signature scheme in multi-signature verification.In our proposal,a method for linking homologous data was presented,which was valuable for incentive mechanism and data analysis.Simulation results showed that the proposed scheme has good performance in terms of security and efficiency in crowd-sensing applications with a large number of users and data.

Analysis of genes related to xylem cell wall development based on transcriptomics in Populus alba ‘Berolinensis’ tension wood

Populus alba‘Berolinensis’is a fast-growing,high-yielding species with strong biotic and abiotic stress resistance,and widely planted for timber,shelter belts and aesthetic purposes.In this study,molecular development is explored and the important genes regulating xylem forma-tion in P.alba‘Berolinensis’under artificial bending treat-ments was identified.Anatomical investigation indicated that tension wood(TW)was characterized by eccentric growth of xylem and was enriched in cellulose;the degree of ligni-fication was lower than for normal wood(NW)and oppo-site wood(OW).RNA-Seq-based transcriptome analysis was performed using developing xylem from three wood types(TW,OW and NW).A large number of differentially expressed genes(DEGs)were screened and 4889 counted.In GO and KEGG enrichment results,genes involved in plant hormone signal transduction,phenylpropanoid biosynthesis,and cell wall and secondary cell wall biogenesis play major roles in xylem development under artificial bending.Eight expansin(PalEXP)genes were identified from the RNA-seq data;four were differentially expressed during tension wood formation.Phylogenetic analysis indicated that PalEXLB1 belongs to the EXPB subfamily and that the other PalEXPs are members of the EXPA subfamily.A transcriptional regulatory network construction showed 10 transcription factors located in the first and second layers upstream of EXP,including WRKY,ERF and bHLH.RT‒qPCR analy-sis in leaves,stems and roots combined with transcriptome analysis suggests that PalEXPA2,PalEXPA4 and PalEXPA15 play significant regulatory roles in cell wall formation during tension wood development.The candidate genes involved in xylem cell wall development during tension wood formation marks an important step toward identifying the molecular regulatory mechanism of xylem development and wood property improvement in P.alba‘Berolinensis’.

Outstanding proton conductivity over wide temperature and humidity ranges and enhanced mechanical, thermal stabilities for surface-modified MIL-101-Cr-NH_(2)/Nafion composite membranes

High-performance proton exchange membranes are of great importance for fuel cells.Here,we have synthesized polycarboxylate plasticizer modified MIL-101-Cr-NH_(2)(PCP-MCN),a kind of hybrid metal-organic framework,which exhibits a superior proton conductivity.PCP-MCN nanoparticles are used as additives to fabricate PCP-MCN/Nafion composite membranes.Microstructures and characteristics of PCP-MCN and these membranes have been extensively investigated.Significant enhancement in proton conduction for PCP-MCN around 55℃ is interestingly found due to the thermal motion of the PCP molecular chains.Robust mechanical properties and higher thermal decomposition temperature of the composite membranes are directly ascribed to strong intermolecular interactions between PCP-MCN and Nafion side chains,i.e.,the formation of substantial acid–base pairs(-SO_(3)^(-)…^(+)H–NH-),which further improves compatibility between additive and Nafion matrix.At the same humidity and temperature condition,the water uptake of composite membranes significantly increases due to the incorporation of porous additives with abundant functional groups and thus less crystallinity degree in comparison to pristine Nafion.Proton conductivity(σ)over wide ranges of humidities(30-100%RH at 25℃)and temperatures(30-98℃ at 100%RH)for prepared membranes is measured.The s in PCPMCN/Nafion composite membranes is remarkably enhanced,i.e.0.245 S/cm for PCP-MCN-3wt.%/Nafion is twice that of Nafion membrane at 98℃ and 100%RH,because of the establishment of well-interconnected proton transport ionic water channels and perhaps faster protonation–deprotonation processes.The composite membranes possess weak humidity-dependence of proton transport and higher water uptake due to excellent water retention ability of PCP-MCN.In particular,when 3 wt.%PCP-MCN was added to Nafion,the power density of a single-cell fabricated with this composite membrane reaches impressively 0.480,1.098 W/cm^(2) under 40%RH,100%RH at 60℃,respectively,guaranteeing it to be a promising proton exchange membrane.

Synthesis of NO by rotating sliding arc discharge reactor with conical-spiral electrodes

The present work investigates the potential applications of nitrogen oxides(NO_(x)),particularly nitric oxide(NO)and nitrogen dioxide(NO_(2)),generated through discharge plasma in diverse sectors such as medicine,nitrogen fixation,energy,and environmental protection.In this study,a rotating sliding arc discharge reactor was initially employed to produce high concentrations of gaseous NO_(x),followed by the utilization of a molybdenum wire redox reactor for NO_(2)-to-NO conversion.The outcomes reveal that the discharge states and generations of NO_(x) are affected by varying parameters,including the applied energies,frequencies and airflow states(1.3-2.6 m/s are the laminar flow,2.6-5.2 m/s are the transition state,5.2-6.5 m/s are the turbulent flow),and the concentrations of NO_(x) within the arc discharge are higher than that in the spark discharge.Moreover,the concentrations of NO,NO_(2) and NO_(x) gradually increased,and the concentration ratios of NO/NO_(2) and NO_(x)/NO_(2) decreased with increasing the applied energy for one cycle from 14.8 mJ to 24.3 mJ.Meanwhile,the concentrations of NO,NO_(2) and NO_(x) gradually decreased,and the concentration ratios of NO/NO_(2) and NO_(x)/NO_(2) first decreased and then increased with increasing the applied frequencies from 5.0 kHz to 9.0 kHz.Further,the concentrations of NO,NO_(2) and NO_(x) gradually decreased,and the concentration ratios of NO/NO_(2) and NO_(x)/NO_(2) first increased and then decreased with increasing the air flow speeds from 1.3 m/s to 6.5 m/s.Lastly,the concentrations of NO increased and NO_(2) decreased with increasing temperature from 25℃ to 400℃ using molybdenum converted.These findings provide experimental support for the application of plasma in the fields of medicine,nitrogen fixation,energy and environmental protection.

Electronic Communication Between Co and Ru Sites Decorated on Nitrogen-Doped Carbon Nanotubes Boosting the Alkaline Hydrogen Evolution Reaction

Designing highly efficient Pt-free electrocatalysts with low overpotential for an alkaline hydrogen evolution reaction(HER)remains a significant challenge.Here,a novel and efficient cobalt(Co),ruthenium(Ru)bimetallic electrocatalyst composed of CoRu nanoalloy decorated on the N-doped carbon nanotubes(CoRu@N-CNTs),was prepared by reacting fullerenol with melamine via hydrothermal treatment and followed by pyrolysis.Benefiting from the electronic communication between Co and Ru sites,the as-obtained CoRu@N-CNTs catalyst exhibited superior electrocatalytic HER activity.To deliver a current density of 10 mA·cm^(-2),it required an overpotential of merely 19 mV along with a Tafel slope of 26.19 mV·dec^(-1)in 1 mol·L^(-1)potassium hydroxide(KOH)solution,outperforming the benchmark Pt/C catalyst.The present work would pave a new way towards the design and construction of an efficient electrocatalyst for energy storage and conversion.

石羊河下游荒漠区雨养梭梭柠条人工林健康评价

梭梭和柠条作为石羊河下游荒漠区生态安全屏障建设的主要树种,分布面积大,在防风固沙、固碳增汇等方面发挥着重要的作用。近20年来,随着地下水位的下降和气候干旱化,梭梭柠条人工林已出现不同程度的衰败和死亡。选择20 a及以上林龄的梭梭、柠条、梭梭+柠条3种林分,对其生长指标、病态指标、更新指标及多样性指标调查,运用模糊判别法从优势种和林下植被两方面评价林分健康状况。结果表明:(1)石羊河下游梭梭柠条整体处于中等健康及以下水平。(2)梭梭柠条混交林健康状况相对优于柠条林、梭梭林,柠条的病虫害轻于梭梭,发芽指数高于梭梭。(3)土壤含水量与其健康序列有明显的正向相关性,健康序列越高含水量越高,全盐量、有机质、速效P分别明显影响着梭梭柠条的高生长、幼苗更新、盖度、枝条发芽和生活型。

以自我监督和人民监督相结合为推进党的自我革命的强大动力:理论探源与实践创新

以自我监督和人民监督相结合为强大动力,明确了党的自我革命的动力机制、监督形态和实践路径,体现了党性和人民性的高度一致,完善了纪检监察的运行机制,丰富了纪检监察的理论体系。新时代践行习近平总书记关于党的自我革命的重要思想,推进自我监督和人民监督相结合,必须科学把握和落实二者相结合的政治要求、制度机制、方式方法,把党内监督同各类监督贯通起来,健全党的自我革命制度规范体系,构建中国特色社会主义监督体系,形成监督合力,开辟党的自我革命引领伟大社会革命新境界。

Effect of vinegar supplementation on patients with esophageal lesions lightly stained with Lugol’s iodine solution:Prospective single-centre trial

BACKGROUND Esophageal chromoendoscopy with iodine solution is important for detecting early esophageal cancer.The effect of routine treatment for lesions lightly stained with Lugol’s iodine solution is limited,and the addition of natural substances to a regular diet is becoming increasingly common.Vinegar has antitumor effects as reported in previous studies.AIM To evaluate whether vinegar supplementation could improve the prognosis of patients with lightly stained esophageal lesions.METHODSThis prospective single-centre trial included consecutive patients with lightly stained lesions between June 2020 and April 2022.Patients in the experimental group received increased amounts of vinegar for 6 months.The primary outcome of the study was the clinical therapeutic effect.Complications related to vinegar ingestion and adverse events were also recorded in detail.RESULTS A total of 166 patients were included in the final analysis.There was no significant difference in the baseline data between the two groups.Intention-to-treat(ITT)analysis demonstrated that the rates at which endoscopic characteristics improved were 33.72%in the experimental group and 20.00%in the conventional group(P=0.007);and the rates at which biopsy pathology improved were 19.77%and 8.75%,respectively(P=0.011).Additional vinegar consumption had a statistically protective effect on the rate at which endoscopic characteristics improved[hazard ratio(HR)_(ITT)=2.183,95%CI:1.183-4.028;HR_(per-protocol(PP))=2.307,95%CI:1.202-4.426]and biopsy pathology improved(HR_(ITT)=2.931,95%CI:1.212-7.089;HR_(PP)=3.320,95%CI:1.295-8.507).No statistically significant effect of increased vinegar consumption on preventing high-grade intraepithelial neoplasia or early cancer was observed(HR_(ITT)=0.382,95%CI:0.079-1.846;HRPP=0.382,95%CI:0.079-1.846).The subgroup analyses indicated that the overall therapeutic improvement of endoscopic characteristics and biopsy pathology seemed more obvious in older(age>60)male patients with small lesions(lesion size≤0.5 cm).Three patients in the experimental group reported acid regurgitation and heartburn.No adverse event during gastroscopy were recorded during follow-up.CONCLUSION A moderately increased ingestion of vinegar could not directly reduce the risk of esophageal cancer in the mucosa dysplasia population,but it improved the endoscopic characteristics and ameliorated the biopsy pathology to a certain extent.Further research is needed to verify the effect of nutritional intervention on precancerous esophageal lesions.

三种感冒药片微量元素的LIBS检测

利用激光诱导击穿光谱技术(Laser-induced breakdown spectroscopy, LIBS),分析了常见感冒药片复方氨酚烷胺分散片、复方氨酚烷胺片(感康)、四季感冒片中的微量元素。波长532 nm的激光聚焦在药片表面产生等离子,通过采集光纤至光谱仪分光,再由增强型电荷耦合器件(Intensified charge-coupled device, ICCD)摄谱,获得三种感冒药片的LIBS光谱。通过对ICCD采集延时和门宽等实验参数的优化获得最佳光谱,检测到氨酚烷胺分散片和四季感冒药中的微量元素有Ca、Mg、Na,复方氨酚烷胺片(感康)中的微量元素有Ca、Mg。由发射光谱线的强度、激发能量、跃迁上能级的权重因子以及跃迁几率,计算得到等离子体的电子温度,研究了激光诱导三种感冒药片等离子体电子温度的时间演化特性。

解毒活血汤对慢性肾脏病大鼠肾脏Smad2、Smad3表达的影响

目的:观察解毒活血汤通过调控慢性肾脏病(CKD)大鼠Smads蛋白在肾脏组织中的表达对CKD的作用。方法:将72只雄性SD大鼠随机分成六组,空白组、模型组、阳性对照组,中药低剂量组、中药中剂量组以及中药高剂量组,每组各12只。除空白组外,其余组的大鼠均通过腺嘌呤悬浮液灌胃并饲喂高磷饮食以建立CKD大鼠模型,造模8周后开始对大鼠进行为期12周的药物灌胃处理,在第12周末,对大鼠血液样本进行肌酐(Scr)、尿素氮(BUN)、磷(P)和血钙(Ca)的生化检测,并用免疫组化法分析肾组织中Smad2、Smad3蛋白的表达。结果:与空白组相比,其余组大鼠血清中的Scr、BUN、P和Ca含量均有显著性差异(P<0.01或P<0.05);与模型组相比,其余组大鼠血清中的Scr、BUN和P的含量普遍降低(P<0.05或P<0.05),而Ca含量则有所上升(P<0.05);与空白组相比,其余组大鼠肾组织中Smad2和Smad3的表达显著增加(P<0.05)。与模型组相比,其余组肾组织中Smad2和Smad3的表达均有所降低(P<0.05)。相较于解毒活血汤低剂量组,高剂量组、中剂量组及阳性对照组的Smad2蛋白和Smad3蛋白表达量均进一步下降(P<0.05)。结论:解毒活血汤显示出对延缓CKD进程的积极作用,并能有效升高肾组织中Smad2、降低Smad3的表达。相较于其余用药组,解毒活血汤高剂量组展现出更显著的疗效,药物剂量与疗效之间存在正相关关系。

水果中微量元素的LIBS检测

以香蕉、菠萝、猕猴桃三种水果为样品,使用波长为532 nm的激光聚焦到样品表面产生等离子体,然后检测等离子体中原子和离子的发射光谱,分析水果中的微量元素和激光诱导等离子体特性。通过优化实验参数,分析谱线强度和信噪比,得到香蕉、菠萝和猕猴桃的较佳ICCD门延时为500 ns、400 ns和400 ns,较佳门宽为800 ns、600 ns和400 ns;检测到香蕉、菠萝、猕猴桃中含有Mg、Ca、Fe等微量元素,其中菠萝、猕猴桃还检测到微量元素Na;通过Boltzmann斜线法计算电子温度,得到香蕉、菠萝、猕猴桃等离子体的电子温度分别为11606 K、10811 K和10685 K;通过H谱线Stark展宽法,非H谱线Stark展宽法和Saha-Boltzmann方程法计算电子密度,得到的电子密度不相同;分析等离子体的电子温度、电子密度及其数据处理过程中遇到的问题,以期对水果中微量元素的定量分析做参考。

Multisim和Simulink仿真在电力电子技术中的应用

电力电子技术是自动化相关专业的基础课程,为了教与学更好地结合,提高教学质量,增强学生的动手能力,以单相桥式全控整流电路为例,研究了关于Multisim以及Simulink仿真的电力电子教学方法,对于每一种仿真软件应用的特点及使用方法都做了分析,并给出了应用实例,研究目的表明Multisim的仿真软件操作简单,可视性强。Simulink软件功能模块丰富,操作性强,能够更精确地反映出电力电子器件的特性。

颅内支撑导管联合Solitaire FR取栓支架技术治疗急性大脑中动脉闭塞脑梗死临床观察

目的分析颅内支撑导管联合Solitaire FR取栓支架(solitaire FR with intracranial support catheter for mechanical thrombectomy,SWIM)技术治疗急性大脑中动脉闭塞脑梗死的安全性、有效性。方法选取2019-05—2020-05湛江中心人民医院神经外二科收治的50例急性大脑中动脉闭塞脑梗死患者为研究对象,行SWIM技术取栓,回顾性分析其临床及影像学资料。结果50例患者血管再通率92.0%,其中血管完全再通40例,部分再通6例,未通4例。50例患者治疗后NIHSS评分(5.86±2.62)与治疗前(22.09±2.31)比较差异有统计学意义(P<0.05)。50例患者术后90 d mRS与术前比较,差异有统计学意义(t=4.01,P<0.05),其中术后mRS≤2者达60%。结论对急性大脑中动脉闭塞脑梗死患者采用SWIM技术治疗临床疗效良好,安全性高。

Tristetraprolin通过NF-kB通路抑制肺腺癌细胞自噬

目的研究RNA结合蛋白tristetraprolin在肺腺癌中的表达及抑制自噬作用的分子机制。方法瞬时转染tristetraprolin过表达质粒,分别在转染tristetraprolin 24、48及72 h后采用实时荧光定量PCR(RT-qPCR)和Western blot检测肺腺癌细胞中tristetraprolin表达及自噬相关分子Beclin1、LC3II/LCI及p62的表达变化。瞬时转染tristetraprolin过表达质粒及加入TNF-α,将肺腺癌细胞分为空载组、tristetraprolin组、空载+TNF-α组及tristetraprolin+TNF-α组,应用免疫荧光和Western blot检测NF-?B p65、c-rel、p50分子在细胞核中表达情况。共转染tristetraprolin过表达质粒及IκBα-mut质粒,将肺腺癌细胞分为tristetraprolin空载组、IκBα-mut空载组、tristetraprolin组、IκBα-mut组及tristetraprolin+IκBα-mut组,采用RT-qPCR和Western blot检测tristetraprolin表达及自噬相关基因表达变化。结果 Tristetraprolin在肺腺癌细胞中RNA及蛋白水平表达低(P<0.001)。过表达tristetraprolin后,自噬相关基因Beclin1、LC3-Ⅱ/LC3-Ⅰ在RNA及蛋白水平表达均较空载组降低(P<0.001)。同时,过表达tristetraprolin后,细胞核内的p65及c-rel蛋白表达较空载组及空载+TNF-α组减少(P<0.05),但p50表达无明显变化(P>0.05)。过表达tristetraprolin后,p65及c-rel核移位较空载组减少。共转染IκBα突变质粒及tristetraprolin过表达质粒后,NF-κB信号通路被阻断,自噬相关基因Beclin1、LC3-Ⅱ/LC3-Ⅰ在RNA及蛋白水平表达较tristetraprolin过表达组升高(P<0.05),NF-?B信号通路被阻断后tristetraprolin对自噬的抑制作用减弱。结论 Tristetraprolin在肺腺癌细胞中低表达,过表达tristetraprolin可能通过抑制NF-?B p65及c-rel核移位而抑制肺腺癌细胞自噬。

lncRNA ENST00000452996.1通过ERK/GSK-3β/β-catenin信号通路调控肝癌细胞增殖、迁移及侵袭

目的研究一种新的长链非编码RNA ENST00000452996.1对肝癌细胞增殖、迁移及侵袭等的影响及其调控机制。方法TCGA数据集分析肝癌组织ENST00000452996.1表达;构建ENST00000452996.1的shRNA载体,包装病毒感染Huh-7细胞(shENST00000452996.1组),CCK-8法、克隆形成法、流式细胞术、划痕法和Transwell小室法分别检测细胞增殖、凋亡、迁移和侵袭能力;Western blot法检测shENST00000452996.1组、ERK激动剂EGF处理组和GSK-3β抑制剂TDZD-8处理组的ERK/GSK-3β/β-catenin信号分子的表达。结果TCGA分析发现,肝癌组织ENST00000452996.1表达水平明显高于癌旁组织,且与Edmondson-Steiner分级呈正相关,与总生存时间呈负相关;与对照组相比,shENST00000452996.1组细胞增殖、迁移及侵袭能力明显下降,凋亡能力明显增强,p-ERK1/2、p-GSK-3β^(Ser9)和β-catenin表达均下调,GSK-3β和p-β-catenin表达上调,核β-catenin表达下降;与shENST00000452996.1组相比,EGF处理组p-ERK1/2表达升高,EGF处理组和TDZD-8处理组p-GSK-3β^(Ser9)和β-catenin及核β-catenin表达均升高,GSK-3β和p-β-catenin表达均降低。结论干扰ENST00000452996.1表达抑制ERK1/2磷酸化,阻止GSK3β^(Ser9)磷酸化,导致β-catenin磷酸化,抑制β-catenin核转位,推断ENST00000452996.1通过ERK/GSK-3β/β-catenin信号通路增强肝癌细胞增殖、迁移及侵袭能力,抑制细胞凋亡,从而发挥促进肝细胞癌的作用。

福建地震活动与岩石圈热结构的关系初探

利用福建及邻近地区的大地热流值、岩石圈生热率和热导率等资料,绘制了福建地区大地热流与震中分布图,估算了福建地区岩石圈不同深度的温度值。福建地区大地热流与地震震中(2007-2020年,ML≥3.5)、震源深度与地温分布的对比研究表明:(1)福建地区地震主要发生在热应力集中的构造断裂带与热流梯级带交汇处;(2)福建地区地震活动最大震源深度一般位于10~20 km,震源区温度在250~450℃之间,震源的分布范围可能与地壳的脆韧性转换带有关。