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Joint position optimization,user association,and resource allocation for load balancing in UAV-assisted wireless networks
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作者 Daosen Zhai Huan Li +2 位作者 Xiao Tang ruonan zhang Haotong Cao 《Digital Communications and Networks》 SCIE CSCD 2024年第1期25-37,共13页
Unbalanced traffic distribution in cellular networks results in congestion and degrades spectrum efficiency.To tackle this problem,we propose an Unmanned Aerial Vehicle(UAV)-assisted wireless network in which the UAV ... Unbalanced traffic distribution in cellular networks results in congestion and degrades spectrum efficiency.To tackle this problem,we propose an Unmanned Aerial Vehicle(UAV)-assisted wireless network in which the UAV acts as an aerial relay to divert some traffic from the overloaded cell to its adjacent underloaded cell.To fully exploit its potential,we jointly optimize the UAV position,user association,spectrum allocation,and power allocation to maximize the sum-log-rate of all users in two adjacent cells.To tackle the complicated joint optimization problem,we first design a genetic-based algorithm to optimize the UAV position.Then,we simplify the problem by theoretical analysis and devise a low-complexity algorithm according to the branch-and-bound method,so as to obtain the optimal user association and spectrum allocation schemes.We further propose an iterative power allocation algorithm based on the sequential convex approximation theory.The simulation results indicate that the proposed UAV-assisted wireless network is superior to the terrestrial network in both utility and throughput,and the proposed algorithms can substantially improve the network performance in comparison with the other schemes. 展开更多
关键词 Load balance Unmanned aerial vehicle Userassociation Resource management
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华北雨季降水年代际变化与水汽输送的联系 被引量:11
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作者 崔童 张若楠 +1 位作者 郝立生 孙丞虎 《大气科学》 CSCD 北大核心 2022年第4期903-920,共18页
本文基于1961~2018年华北地区均一化逐日降水资料和ECMWF(欧洲中期天气预报中心)ERA5全球再分析环流资料,采用一种综合考虑降水量和西太平洋副热带高压脊线影响的雨季监测标准,计算了华北雨季起讫日期和降水量,在此基础上讨论了华北雨... 本文基于1961~2018年华北地区均一化逐日降水资料和ECMWF(欧洲中期天气预报中心)ERA5全球再分析环流资料,采用一种综合考虑降水量和西太平洋副热带高压脊线影响的雨季监测标准,计算了华北雨季起讫日期和降水量,在此基础上讨论了华北雨季季节内进程的水汽输送特征。重点分析了降水量与水汽收支的年代际变化关系,揭示了水汽输送的时空变化规律及其对华北雨季降水的影响。研究结果表明:(1)华北雨季每年的起讫日期不同,从而每年雨季发生时段和季节内进程不同。(2)降水的形成与水汽输送及其辐合密切相关,有四个水汽通道维持华北雨季降水,即印度季风水汽、东亚季风水汽、110°E~120°E之间越赤道气流向北的水汽输送和40°N附近中纬度西风带水汽。(3)华北雨季降水和净水汽收支具有相似的年代际变化特征,分别在1977、1987、1999年发生突变,总体呈现“减—增—减”的阶段性变化趋势,两者位相转变相关性很强。(4)水汽输送的强弱和到达华北时间的早晚均对雨季降水多寡有重要影响。华北多雨年代与少雨年代水汽通量有明显的差异,主要表现在:在多雨年代,西北太平洋为反气旋式环流异常,偏南水汽强盛,并且与中高纬西风带异常偏西水汽汇聚于华北,华北地区水汽辐合偏强;考虑季节内进程,水汽到达华北的时间早、强度大,停留时间长、辐合强,减弱的时间晚;而在少雨年代,我国东北地区、朝鲜半岛及日本海附近为气旋式环流异常,华北地区由南向北的水汽输送偏弱,水汽辐散明显加强;季节内进程表现出与多雨年代相反的特征。(5)考虑华北地区四个边界的水汽收支,南边界和西边界有最大、次大水汽输入,二者的年代际变化是影响雨季降水年代际变化的重要因素。在多雨年代,南边界和西边界水汽净输入很强,但北边界的输出也很强;在少雨年代,南边界和西边界水汽净输入很弱,但北边界转为输入,这是区别于多雨年代的重要特征。 展开更多
关键词 华北雨季 水汽输送 水汽收支 年代际变化
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Preparation, characterization, pharmacokinetics and anticancer effects of PEGylated β-elemene liposomes 被引量:6
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作者 Bingtao Zhai Qibiao Wu +15 位作者 Wengang Wang Mingming zhang Xuemeng Han Qiujie Li Peng Chen Xiaying Chen Xingxing Huang Guohua Li Qin zhang ruonan zhang Yu Xiang Shuiping Liu Ting Duan Jianshu Lou Tian Xie Xinbing Sui 《Cancer Biology & Medicine》 SCIE CAS CSCD 2020年第1期60-75,共16页
Objective:This study aimed to develop a new polyethylene glycol(PEG)ylatedβ-elemene liposome(PEG-Lipo-β-E)and evaluate its characterization,pharmacokinetics,antitumor effects and safety in vitro and in vivo.Methods:... Objective:This study aimed to develop a new polyethylene glycol(PEG)ylatedβ-elemene liposome(PEG-Lipo-β-E)and evaluate its characterization,pharmacokinetics,antitumor effects and safety in vitro and in vivo.Methods:The liposomes were prepared by ethanol injection and high-pressure micro-jet homogenization.Characterization of the liposomes was conducted,and drug content,entrapment efficiency(EE),in vitro release and stability were studied by ultra-fast liquid chromatography(UFLC)and a liquid surface method.Blood was drawn from rats to establish the pharmacokinetic parameters.The anticancer effect was evaluated in a KU-19-19 bladder cancer xenograft model.Histological analyses were performed to evaluate safety.Results:The PEG-Lipo-β-E showed good stability and was characterized as 83.31±0.181 nm in size,0.279±0.004 in polydispersity index(PDI),-21.4±1.06 mV in zeta potential,6.65±0.02 in pH,5.024±0.107 mg/mL inβ-elemene(β-E)content,and 95.53±1.712%in average EE.The Fourier transform infrared spectroscopy(FTIR)and differential scanning calorimetry(DSC)indicated the formation of PEG-Lipo-β-E.Compared to elemene injection,PEG-Lipo-β-E demonstrated a 1.75-fold decrease in clearance,a 1.62-fold increase in half-life,and a 1.76-fold increase in area under the concentration-time curves(AUCs)from 0 hour to 1.5 hours(P<0.05).PEG-Lipo-β-E also showed an enhanced anticancer effect in vivo.Histological analyses showed that there was no evidence of toxicity to the heart,kidney,liver,lung or spleen.Conclusions:The present study demonstrates PEG-Lipo-β-E as a new formulation with ease of preparation,high EE,good stability,improved bioavailability and antitumor effects. 展开更多
关键词 Β-ELEMENE PEGylated liposome PHARMACOKINETICS antitumor effect bladder cancer
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An ATF24 peptide-functionalized β-elemene-nanostructured lipid carrier combined with cisplatin for bladder cancer treatment 被引量:5
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作者 Bingtao Zhai Peng Chen +18 位作者 Wengang Wang Shuiping Liu Jiao Feng Ting Duan Yu Xiang ruonan zhang Mingming zhang Xuemeng Han Xiaying Chen Qiujie Li Guohua Li Ying Liu Xingxing Huang Wenzheng zhang Ting Pan Lili Yan Ting Jin Tian Xie Xinbing Sui 《Cancer Biology & Medicine》 SCIE CAS CSCD 2020年第3期676-692,共17页
Objective:In this study,we aimed to develop an amino-terminal fragment(ATF)peptide-targeted liposome carryingβ-elemene(ATF24-PEG-Lipo-β-E)for targeted delivery into urokinase plasminogen activator receptor-overexpre... Objective:In this study,we aimed to develop an amino-terminal fragment(ATF)peptide-targeted liposome carryingβ-elemene(ATF24-PEG-Lipo-β-E)for targeted delivery into urokinase plasminogen activator receptor-overexpressing bladder cancer cells combined with cisplatin(DDP)for bladder cancer treatment.Methods:The liposomes were prepared by ethanol injection and high-pressure microjet homogenization.The liposomes were characterized,and the drug content,entrapment efficiency,andin vitro release were studied.The targeting efficiency was investigated using confocal microscopy,ultra-fast liquid chromatography,and an orthotopic bladder cancer model.The effects of ATF24-PEG-Lipo-β-E combined with DDP on cell viability and proliferation were evaluated by a Cell Counting Kit-8(CCK-8)assay,a colony formation assay,and cell apoptosis and cell cycle analyses.The anticancer effects were evaluated in a KU-19-19 bladder cancer xenograft model.Results:ATF24-PEG-Lipo-β-E had small and uniform sizes(~79 nm),high drug loading capacity(~5.24 mg/mL),high entrapment efficiency(98.37±0.95%),and exhibited sustained drug release behavior.ATF24-PEG-Lipo-β-E had better targeting efficiency and higher cytotoxicity than polyethylene glycol(PEG)ylatedβ-elemene liposomes(PEG-Lipo-β-E).DDP,combined with ATF24-PEG-Lipo-β-E,exerted a synergistic effect on cellular apoptosis and cell arrest at the G2/M phase,and these effects were dependent on the caspase-dependent pathway and Cdc25C/Cdc2/cyclin B1 pathways.Furthermore,thein vivo antitumor activity showed that the targeted liposomes effectively inhibited the growth of tumors,using the combined strategy.Conclusions:The present study provided an effective strategy for the targeted delivery ofβ-elemene(β-E)to bladder cancer,and a combined strategy for bladder cancer treatment. 展开更多
关键词 UPAR Β-ELEMENE active targeting liposome bladder cancer DDP
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A judicious approach to induce large size growth of hydroxyapatite via applying graphene modified silicon nitride nanowires
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作者 Lina Sun Leilei zhang +1 位作者 ruonan zhang Hejun Li 《Journal of Materiomics》 SCIE CSCD 2024年第2期490-498,共9页
Mimicking the structure of natural bone collagen fibers/hydroxyapatite(HA)to synthesize large size of HA for accelerated bone repair remains a challenge.Herein,silicon nitride nanowires(SN)-graphene(GE)was designed by... Mimicking the structure of natural bone collagen fibers/hydroxyapatite(HA)to synthesize large size of HA for accelerated bone repair remains a challenge.Herein,silicon nitride nanowires(SN)-graphene(GE)was designed by the chemical vapor deposition,forming SN-GE(SG)similar to collagen fibers.Then,the large size HA was assembled onto SG by pulsed electrochemical deposition,the SG/HA(SGH)mimics the collagen fibers/HA structure of bone.The introduction of SG induces HA to large size grow in the form of coral-like.HA can be grown on a large size inextricably with the existence of GE modified layers.On the one hand,the upright GE sheets effectively increases the surface roughness which enhances the nucleation site of HA.On the other hand,the C=O provides chemical bonding and induces HA nucle-ation.Compared with SN/HA(SH),the porosity of SGH decreased by 71%.The average diameter of the SGH is(9.76±0.25)mm.Compared with SH,the diameter of SGH is 22 times larger than the diameter of SH.Indicating that SG induces large size growth of HA.Our work can provide a general strategy for the efficient preparation of biological scaffolds with large size HA that can be used in bone tissue engineering. 展开更多
关键词 HYDROXYAPATITE GRAPHENE Large size Silicon nitride nanowires Bone tissue engineering
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Thermal insulating and fire-retardant Si_(3)N_(4) nanowire membranes resistant to high temperatures up to 1300℃ 被引量:1
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作者 Yeye Liu Leilei zhang +4 位作者 ruonan zhang Siqi Shao Lina Sun Xinyi Wan Tiantian Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第24期82-88,共7页
Superior thermal insulating and fire-retardant ceramic membranes are urgently demanded in the aerospace,construction,and chemical engineering industries.However,the generic characteristics of ceramic membranes,such as... Superior thermal insulating and fire-retardant ceramic membranes are urgently demanded in the aerospace,construction,and chemical engineering industries.However,the generic characteristics of ceramic membranes,such as brittleness,structural collapse,and crystallization-induced pulverization behavior,present a great plague to their practical applications.Herein,we report a highly flexible,mechanically stable,fire-retardant,and high-temperature-resistant ceramic membrane based on the interlocked Si_(3)N_(4) nanowires formed by the precursor pyrolysis method.The Si_(3)N_(4) nanowire membrane(SNM)has excellent high-temperature resistance under alcohol lamps and butane spray lance.The thermal insulation with a thermal conductivity as low as 0.056 W m^(-1)K^(-1)can be attributed to the high porosity of SNM,which makes it a desirable candidate for heat insulators under harsh conditions.More importantly,SNM exhibits thermal stability and robust mechanical properties in the range of 25 to 1300℃.The high-temperature resistance of SNM up to 1300℃is achieved by the four stages:Si3 N4 nanowires,Si_(3)N_(4)@SiO_(2) nanowires,SiO_(2) nanowires,and bead-like SiO_(2) nanowires.After heat-treated at 1300℃,the macroscopic size of SNM does not change significantly,and the interlocked structure is still maintained.Furthermore,SNM still maintains excellent mechanical properties,with tensile strength as high as 0.26 MPa.This work provides a facile method for fabricating excellent thermal insulating and fire-retardant ceramic membranes,showing prospective application prospects in the era of thermal insulating materials. 展开更多
关键词 Silicon nitride nanowires Thermal insulation Fire-resistance High-temperature resistance
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BmMD-2A responds to 20-hydroxyecdysone and regulates Bombyx mori silkworm innate immunity in larva-to-pupa metamorphosis
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作者 ruonan zhang Xue Chen +6 位作者 Yuan Wang Xu Bai Qiong Yang Yangjin Zhong Xiao-Qiang Yu Fengliang Jin Wanying Yang 《Insect Science》 SCIE CAS CSCD 2023年第2期411-424,共14页
20E-hydroxyecdysone(20E)plays important roles in larval molting and metamorphosis in insects and is also involved in the insect innate immune response.Insect metamorphosis is a highly successful strategy for environme... 20E-hydroxyecdysone(20E)plays important roles in larval molting and metamorphosis in insects and is also involved in the insect innate immune response.Insect metamorphosis is a highly successful strategy for environmental adaptation and is the most vulnerable stage during which the insect is susceptible to various pathogens.20E regulates a series of antimicrobial peptides(AMPs)through the immunodeficiency(IMD)pathway activation in Drosophila;nevertheless,whether other immune pathways are involved in 20E-regulated insect immunity is unknown.Our previous studies showed that BmMD-2A is a member of the MD-2-related lipid recognition(ML)family of proteins that are involved in the Bombyx mori innate immunity Toll signaling pathway.In this study,we further demonstrate that BmMD-2A is also positively regulated by 20E,and the BmMD-2A neutralization experiment suggested that 20E activates some downstream immune effect factors,the AMP genes against Escherichia coli and Staphylococcus aureus,through the regulation of BmMD-2A in larval metamorphosis,implying that B.mori may use the Toll-ML signaling pathway to maintain innate immune balance in the larval-pupal metamorphosis stage,which is a different innate immunity pathway regulated by 20E compared to the IMD pathway in Drosophila. 展开更多
关键词 AMPs BmMD-2A 20E innate immune METAMORPHOSIS
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温和光热疗法在肿瘤治疗中的研究进展 被引量:7
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作者 黄星星 刘颖 +12 位作者 张若男 冯娇 刘水平 段婷 张明明 项煜 陈碧 陈夏颖 陈鹏 张文政 谢恬 欧阳晓平 隋新兵 《科学通报》 EI CAS CSCD 北大核心 2020年第32期3538-3550,共13页
癌症是目前世界上发病率和死亡率最高的疾病之一.光热疗法(photothermal therapy,PTT)是一种无创的癌症治疗新策略,即把具有较高光热转化效率的材料(photothermal agent,PTA)注入人体内部,利用靶向性聚集在肿瘤组织附近,再在近红外(near... 癌症是目前世界上发病率和死亡率最高的疾病之一.光热疗法(photothermal therapy,PTT)是一种无创的癌症治疗新策略,即把具有较高光热转化效率的材料(photothermal agent,PTA)注入人体内部,利用靶向性聚集在肿瘤组织附近,再在近红外(near-infrared,NIR)等外部光源的照射下,将光能转化为热能来杀死癌细胞.然而,光热治疗所需要达到的高温可能对正常组织损伤较大,因此,相对低温的温和光热疗法(mild photothermal therapy,MPTT)备受关注.温和光热疗法本身的抗肿瘤作用有限,通常需与其他疗法联合以构建协同治疗体系,达到治疗肿瘤的目的.近期,本团队合成了一种二维锗量子点光热转换材料,突破了既往无法得到二维材料以及传统材料光热转换效率低的重大难题.本文从温和光热疗法常用光热转换剂的类型及特点、主要障碍及其解决策略、抗肿瘤作用机制、与其他疗法联合的效果等方面对温和光热疗法在肿瘤治疗中的研究现状进行系统性总结,并对未来的发展方向进行展望和讨论,旨在为肿瘤治疗提供一种新思路和新方法. 展开更多
关键词 温和光热疗法 肿瘤 纳米材料 联合疗法
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中西医结合防治肿瘤耐药的研究进展 被引量:10
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作者 张文政 黄星星 +11 位作者 陈碧 刘颖 冯娇 刘水平 张若男 项煜 段婷 张明明 陈夏颖 陈鹏 隋新兵 谢恬 《科学通报》 EI CAS CSCD 北大核心 2020年第18期1845-1856,共12页
化疗和靶向治疗是晚期恶性肿瘤的主要治疗方法之一,而其耐药性是导致肿瘤治疗失败的重要原因.引起肿瘤耐药的原因有肿瘤细胞的异质性、药物外排及代谢失活、肿瘤微环境变化、DNA损伤修复失调、表观遗传改变等多种因素.当前,临床上主要... 化疗和靶向治疗是晚期恶性肿瘤的主要治疗方法之一,而其耐药性是导致肿瘤治疗失败的重要原因.引起肿瘤耐药的原因有肿瘤细胞的异质性、药物外排及代谢失活、肿瘤微环境变化、DNA损伤修复失调、表观遗传改变等多种因素.当前,临床上主要采取更换联合化疗用药或更换新的抗肿瘤药物的策略来克服肿瘤耐药,但由于该方法作用靶点单一,且治疗耐药过程中容易产生新的耐药甚至多药耐药,导致肿瘤治疗的难度增大.因此,寻找高效、低毒、广谱的逆转肿瘤耐药方法或药物已成为当今肿瘤领域的研究热点及难点.中医药由于成分复杂,可以通过多组分、多靶点呈现多方面抗肿瘤作用,因而在增强抗肿瘤药物敏感性或克服肿瘤耐药方面具有巨大潜能.本文系统阐述了肿瘤耐药的发生机制,分析了现代医学和传统中医学在克服肿瘤耐药方面的最新研究进展,旨在为增强抗肿瘤药物的敏感性或克服肿瘤耐药提供一种新的思路和策略. 展开更多
关键词 中医 西医 中西医结合 化疗耐药 化疗抵抗
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Baicalin induces ferroptosis in bladder cancer cells by downregulating FTH1 被引量:42
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作者 Na Kong Xiaying Chen +20 位作者 Jiao Feng Ting Duan Shuiping Liu Xueni Sun Peng Chen Ting Pan Lili Yan Ting Jin Yu Xiang Quan Gao Chengyong Wen Weirui Ma Wencheng Liu Mingming zhang Zuyi Yang Wengang Wang ruonan zhang Bi Chen Tian Xie Xinbing Sui Wei Tao 《Acta Pharmaceutica Sinica B》 SCIE CAS CSCD 2021年第12期4045-4054,共10页
Ferroptosis is a non-apoptotic regulated cell death caused by iron accumulation and subsequent lipid peroxidation.Currently,the therapeutic role of ferroptosis on cancer is gaining increasing interest.Baicalin an acti... Ferroptosis is a non-apoptotic regulated cell death caused by iron accumulation and subsequent lipid peroxidation.Currently,the therapeutic role of ferroptosis on cancer is gaining increasing interest.Baicalin an active component in Scutellaria baicalensis Georgi with anticancer potential various cancer types;however,the effects of baicalein on bladder cancer and the underlying molecular mechanisms remain largely unknown.In the study,we investigated the effect of baicalin on bladder cancer cells5637 and KU-19-19.As a result,we show baicalin exerted its anticancer activity by inducing apoptosis and cell death in bladder cancer cells.Subsequently,we for the first time demonstrate baicalin-induced ferroptotic cell death in vitro and in vivo,accompanied by reactive oxygen species(ROS) accumulation and intracellular chelate iron enrichment.The ferroptosis inhibitor deferoxamine but not necrostatin-1,chloroquine(CQ),N-acetyl-L-cysteine,L-glutathione reduced,or carbobenzoxy-valyl-alanyl-aspartyl-[O-methyl]-fluoromethylketone(Z-VAD-FMK) rescued baicalin-induced cell death,indicating ferroptosis contributed to baicalin-induced cell death.Mechanistically,we show that ferritin heavy chain1(FTH1) was a key determinant for baicalin-induced ferroptosis.Overexpression of FTH1 abrogated the anticancer effects of baicalin in both 5637 and KU19-19 cells.Taken together,our data for the first time suggest that the natural product baicalin exerts its anticancer activity by inducing FTH1-dependent ferroptosis,which will hopefully provide a prospective compound for bladder cancer treatment. 展开更多
关键词 BAICALIN Ferroptosis Bladder cancer FTH1 DEFEROXAMINE
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Erianin,a novel dibenzyl compound in Dendrobium extract,inhibits lung cancer cell growth and migration via calcium/calmodulin-dependent ferroptosis 被引量:57
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作者 Peng Chen Qibiao Wu +32 位作者 Jiao Feng Lili Yan Yitian Sun Shuiping Liu Yu Xiang Mingming zhang Ting Pan Xiaying Chen Ting Duan Lijuan Zhai Bingtao Zhai Wengang Wang ruonan zhang Bi Chen Xuemeng Han Yicong Li Liuxi Chen Ying Liu Xingxing Huang Ting Jin Wenzheng zhang Hong Luo Xiaohui Chen Yongqiang Li Qiujie Li Guohua Li Qin zhang Lvjia Zhuo Zuyi Yang Huifen Tang Tian Xie Xiaoping Ouyang Xinbing Sui 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2020年第1期1882-1892,共11页
Ferroptosis,a novel form of programmed cell death,is characterized by iron-dependent lipid peroxidation and has been shown to be involved in multiple diseases,including cancer.Stimulating ferroptosis in cancer cells m... Ferroptosis,a novel form of programmed cell death,is characterized by iron-dependent lipid peroxidation and has been shown to be involved in multiple diseases,including cancer.Stimulating ferroptosis in cancer cells may be a potential strategy for cancer therapy.Therefore,ferroptosis-inducing drugs are attracting more attention for cancer treatment.Here,we showed that erianin,a natural product isolated from Dendrobium chrysotoxum Lindl,exerted its anticancer activity by inducing cell death and inhibiting cell migration in lung cancer cells.Subsequently,we demonstrated for the first time that erianin induced ferroptotic cell death in lung cancer cells,which was accompanied by ROS accumulation,lipid peroxidation,and GSH depletion.The ferroptosis inhibitors Fer-1 and Lip-1 but not Z-VAD-FMK,CQ,or necrostatin-1 rescued erianin-induced cell death,indicating that ferroptosis contributed to erianin-induced cell death.Furthermore,we demonstrated that Ca^(2+)/CaM signaling was a critical mediator of erianin-induced ferroptosis and that blockade of this signaling significantly rescued cell death induced by erianin treatment by suppressing ferroptosis.Taken together,our data suggest that the natural product erianin exerts its anticancer effects by inducing Ca^(2+)/CaMdependent ferroptosis and inhibiting cell migration,and erianin will hopefully serve as a prospective compound for lung cancer treatment. 展开更多
关键词 PEROXIDATION lung drugs
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Curcumenol triggered ferroptosis in lung cancer cells via lncRNA H19/miR-19b-3p/FTH1 axis 被引量:15
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作者 ruonan zhang Ting Pan +20 位作者 Yu Xiang Mingming zhang Han Xie Zimao Liang Bi Chen Cong Xu Jing Wang Xingxing Huang Qianru Zhu Ziming Zhao Quan Gao Chengyong Wen Wencheng Liu Weirui Ma Jiao Feng Xueni Sun Ting Duan Elaine Lai-Han Leung Tian Xie Qibiao Wu Xinbing Sui 《Bioactive Materials》 SCIE 2022年第7期23-36,共14页
Curcumenol,an effective ingredient of Wenyujin,has been reported that exerted its antitumor potential in a few cancer types.However,the effect and molecular mechanism of curcumenol in lung cancer are largely unknown.H... Curcumenol,an effective ingredient of Wenyujin,has been reported that exerted its antitumor potential in a few cancer types.However,the effect and molecular mechanism of curcumenol in lung cancer are largely unknown.Here,we found that curcumenol induced cell death and suppressed cell proliferation in lung cancer cells.Next,we demonstrated that ferroptosis was the predominant method that contributed to curcumenol-induced cell death of lung cancer in vitro and vivo for the first time.Subsequently,using RNA sequencing,we found that the long non-coding RNA H19(lncRNA H19)was significantly downregulated in lung cancer cells treated with curcumenol,when compared to untreated controls.Overexpression of lncRNA H19 eliminated the anticancer effect of curcumenol,while lncRNA H19 knockdown promoted ferroptosis induced by curcumenol treatment.Mechanistically,we showed that lncRNA H19 functioned as a competing endogenous RNA to bind to miR-19b-3p,thereby enhanced the transcription activity of its endogenous target,ferritin heavy chain 1(FTH1),a marker of ferroptosis.In conclusion,our data show that the natural product curcumenol exerted its antitumor effects on lung cancer by triggering ferroptosis,and the lncRNA H19/miR-19b-3p/FTH1 axis plays an essential role in curcumenol-induced ferroptotic cell death.Therefore,our findings will hopefully provide a valuable drug for treating lung cancer patients. 展开更多
关键词 Curcumenol Ferroptosis Lung cancer lncRNA H19 miRNA-19b-3p FTH1
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Simultaneously enhancing mechanical and tribological properties of carbon fiber composites by grafting SiC hexagonal nanopyramids for brake disk application 被引量:5
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作者 Yao Guo Leilei zhang +6 位作者 Qiang Song ruonan zhang Fei Zhao Wei Li Hongchao Sheng Xianghui Hou Hejun Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第26期1-8,共8页
Extensive attention has been drawn to the development of carbon fiber composites for their application in brake disks due to the increasing demand for brake disks with high mechanical strength and better tribological ... Extensive attention has been drawn to the development of carbon fiber composites for their application in brake disks due to the increasing demand for brake disks with high mechanical strength and better tribological properties.Herein,we design SiC hexagonal nanopyramids modified carbon/carbon(SiCNPsC/C)composites,in which SiCNPs are radially grafted on the carbon fibers by the combined sol-gel and carbothermal reduction method,and pyrolytic carbon(Py C)matrix is deposited on nucleation sites including carbon fibers and SiCNPs by isothermal chemical vapor infiltration(ICVI).Benefiting from the special structure,SiCNPs-C/C composites exhibit superior mechanical and frictional performance.Compared with C/C composites,SiCNPs-C/C composites have 147%,90.3%,70.6%,and 117.9%improvement in the hardness,interlaminar shear strength,and out-of-plane and in-plane compressive strength,respectively,which is attributed to the optimized fiber/matrix(F/M)interfaces bonding and the enhanced cohesion strength of Py C matrix.In addition,the friction coefficient of SiCNPs-C/C composites increases by 25.5%,and the wear rate decreases by 38.0%.This work provides an optional design thought for the nanomaterials and enlightens the mechanical and frictional modification of composites in the field of the brakes. 展开更多
关键词 SiC hexagonal nanopyramids Carbon/carbon composites Microstructure Mechanical properties Tribological properties
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PCDH17 increases the sensitivity of colorectal cancer to 5-fluorouracil treatment by inducing apoptosis and autophagic cell death 被引量:7
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作者 Shuiping Liu Haoming Lin +31 位作者 Da Wang Qiang Li Hong Luo Guoxiong Li Xiaohui Chen Yongqiang Li Peng Chen Bingtao Zhai Wengang Wang ruonan zhang Bi Chen Mingming zhang Xuemeng Han Qiujie Li Liuxi Chen Ying Liu Xiaying Chen Guohua Li Yu Xiang Ting Duan Jiao Feng Jianshu Lou Xingxing Huang Qin zhang Ting Pan Lili Yan Ting Jin Wenzheng zhang Lvjia Zhuo Yitian Sun Tian Xie Xinbing Sui 《Signal Transduction and Targeted Therapy》 SCIE CSCD 2019年第1期176-185,共10页
5-Fluorouracil(5-FU)is known as a first-line chemotherapeutic agent against colorectal cancer(CRC),but drug resistance occurs frequently and significantly limits its clinical success.Our previous study showed that the... 5-Fluorouracil(5-FU)is known as a first-line chemotherapeutic agent against colorectal cancer(CRC),but drug resistance occurs frequently and significantly limits its clinical success.Our previous study showed that the protocadherin 17(PCDH17)gene was frequently methylated and functioned as a tumor suppressor in CRC.However,the relationship between PCDH17 and 5-FU resistance in CRC remains unclear.Here,we revealed that PCDH17 was more highly expressed in 5-FU-sensitive CRC tissues than in 5-FU-resistant CRC tissues,and high expression of PCDH17 was correlated with high BECN1 expression.Moreover,this expression profile contributed to superior prognosis and increased survival in CRC patients.Restoring PCDH17 expression augmented the 5-FU sensitivity of CRC in vitro and in vivo by promoting apoptosis and autophagic cell death.Furthermore,autophagy played a dominant role in PCDH17-induced cell death,as an autophagy inhibitor blocked cell death to a greater extent than the pancaspase inhibitor Z-VAD-FMK.PCDH17 inhibition by siRNA decreased the autophagy response and 5-FU sensitivity.Mechanistically,we showed that c-Jun NH2-terminal kinase(JNK)activation was a key determinant in PCDH17-induced autophagy.The compound SP600125,an inhibitor of JNK,suppressed autophagy and 5-FU-induced cell death in PCDH17-reexpressing CRC cells.Taken together,our findings suggest for the first time that PCDH17 increases the sensitivity of CRC to 5-FU treatment by inducing apoptosis and JNK-dependent autophagic cell death.PCDH17 may be a potential prognostic marker for predicting 5-FU sensitivity in CRC patients. 展开更多
关键词 DEATH TREATMENT APOPTOSIS
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Energy-efficient data collection for UAV-assisted IoT: Joint trajectory and resource optimization 被引量:3
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作者 Xiao TANG Wei WANG +1 位作者 Hongliang HE ruonan zhang 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第9期95-105,共11页
Internet of Things(IoT) can be conveniently deployed while empowering various applications, where the IoT nodes can form clusters to finish certain missions collectively. As energyefficient operations are critical to ... Internet of Things(IoT) can be conveniently deployed while empowering various applications, where the IoT nodes can form clusters to finish certain missions collectively. As energyefficient operations are critical to prolong the lifetime of the energy-constrained IoT devices, the Unmanned Aerial Vehicle(UAV) can be dispatched to geographically approach the IoT clusters towards energy-efficient IoT transmissions. This paper intends to maximize the system energy efficiency by considering both the IoT transmission energy and UAV propulsion energy, where the UAV trajectory and IoT communication resources are jointly optimized. By applying largesystem analysis and Dinkelbach method, the original fractional optimization is approximated and reformulated in the form of subtraction, and further a block coordinate descent framework is employed to update the UAV trajectory and IoT communication resources iteratively. Extensive simulation results are provided to corroborate the effectiveness of the proposed method. 展开更多
关键词 Block coordinate descent Data collection Dinkelbach method Energy efficiency Internet of Things(IoT) Unmanned aerial vehicle
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Ultrafast and real-time physical random bit extraction with all-optical quantization 被引量:4
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作者 Ya Guo Qiang Cai +4 位作者 Pu Li ruonan zhang Bingjie Xu K.Alan Shore Yuncai Wang 《Advanced Photonics》 SCIE EI CAS CSCD 2022年第3期83-89,共7页
Optical chaos generated by perturbing semiconductor lasers has been viewed,over recent decades,as an excellent entropy source for fast physical random bit generation(RBG)owing to its high bandwidth and large random fl... Optical chaos generated by perturbing semiconductor lasers has been viewed,over recent decades,as an excellent entropy source for fast physical random bit generation(RBG)owing to its high bandwidth and large random fluctuations.However,most optical-chaos-based random bit generators perform their quantization process in the electrical domain using electrical analog-to-digital converters,so their real-time rates in a single channel are severely limited at the level of Gb/s due to the electronic bottleneck.Here,we propose and experimentally demonstrate an all-optical method for RBG where chaotic pulses are quantized into a physical random bit stream in the all-optical domain by means of a length of highly nonlinear fiber.In our proof-of-concept experiment,a 10-Gb/s random bit stream is successfully generated on-line using our method.Note that the single-channel real-time rate is limited only by the chaos bandwidth.Considering that the Kerr nonlinearity of silica fiber with an ultrafast response of few femtoseconds is exploited for composing the key part of quantizing laser chaos,this scheme thus may operate potentially at much higher real-time rates than 100 Gb/s provided that a chaotic entropy source of sufficient bandwidth is available. 展开更多
关键词 CHAOS random number generation semiconductor lasers optical signal processing.
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Genome-wide identification and characterization of basic helix-loop-helix transcription factors in Spodoptera litura upon pathogen infection 被引量:1
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作者 Jie zhang Mengyao Zhu +6 位作者 Qilin Li Ting Tang Liang Wen Jielai Zhong ruonan zhang Xiao-Qiang Yu Yuzhen Lu 《Insect Science》 SCIE CAS CSCD 2022年第4期977-992,共16页
Basic helix-loop-helix(bHLH)transcription factors play an important role in a wide range of metabolic and developmental processes in eukaryotes,and bHLH proteins also participate in immune responses,especially in plan... Basic helix-loop-helix(bHLH)transcription factors play an important role in a wide range of metabolic and developmental processes in eukaryotes,and bHLH proteins also participate in immune responses,especially in plants.However,their roles in insects upon entomopathogen infection are unknown.In this study,54 bHLH genes in 41 families were identified in a polyphagous pest,Spodoptera litura,including a new bHLH gene in group B,which is specifically present in Lepidoptera and was thus named Lep.The conserved amino acids in the bHLH domain,structural architecture,and chromosomal distribution of bHLH genes in S.litura were analyzed.The bHLH genes in Plutella xylostella and Apis mellifera were also updated,and genome-wide comparison and phylogenetic analysis of bHLH members in 5 holometabolous insects were performed.The expression profiles of S.litura bHLH(SlbHLH)genes in 3 tissues at different developmental stages and their responses to S.litura nucleopolyhedrovirus(SpltNPV),Nomuraea rileyi(Nr),and Bacillus thuringiensis(Bt)infection were investigated.More SlbHLHs in group B were expressed and differentially expressed during pathogen infections,and SlbHLHs tended to be downregulated in the midgut of S.litura larvae after B.thuringiensis treatment.Our study provides an overview of bHLH family members in S.litura and their responses to different pathogens used for pest biocontrol.These findings on bHLH members may contribute to uncovering the mechanism of host-pathogen interaction. 展开更多
关键词 basic helix-loop-helix ENTOMOPATHOGEN INFECTION pest biocontrol Spodoptera liura
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Genome-wide identification and comparative analysis of Cry toxin receptor families in 7 insect species with a focus on Spodoptera litura 被引量:1
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作者 Qilin Li Mengge Li +7 位作者 Mengyao Zhu Jielai Zhong Liang Wen Jie zhang ruonan zhang Qiang Gao Xiao-Qiang Yu Yuzhen Lu 《Insect Science》 SCIE CAS CSCD 2022年第3期783-800,共18页
Cadherin,aminopeptidase N(APN)and alkaline phosphatase(ALP)have been characterized as Cry receptors.In this study,comparative genomic analysis of the 3 receptor families was performed in 7 insects.ALPs and APNs are di... Cadherin,aminopeptidase N(APN)and alkaline phosphatase(ALP)have been characterized as Cry receptors.In this study,comparative genomic analysis of the 3 receptor families was performed in 7 insects.ALPs and APNs are divided into three and eight clades in phylogenetic trees,respectively.ALPs in clade 3 and APNs in clade 1 contain multiple paralogs within each species and most paralogs are located closely in chromosomes.Drosophila melanogaster has expanded APNs in clade 5 and were lowly expressed in midgut.Cadherins are divided into 16 clades;they may diverge before holometabolous insect speciation except for BtR and Cad89D-like clades.Eight insects from different orders containing BtR orthologs are sensitive to Cryl A or Cry3A,while five species without BtR are insensitive to both toxins.Most APNs in clade 1,several ALPs in clade 3,BtR and Cad89D-like genes were highly or moderately expressed in larval midgut of Spodoptera litura and the other six species,and several members in these clades have been identi-•fied as Cry receptors.Expressions of putative 5.litura Cry receptors in the midgut after exposing to Bt toxins were also analyzed. 展开更多
关键词 alkaline phosphatase aminopeptidase N Bacillus thuringiensis CADHERIN Cry toxin
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From borophosphate to fluoroborophosphate:a rational design of fluorine-induced birefringence enhancement 被引量:1
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作者 Wenyao zhang Zhizhong zhang +4 位作者 Wenqi Jin ruonan zhang Meng Cheng Zhihua Yang Shilie Pan 《Science China Chemistry》 SCIE EI CSCD 2021年第9期1498-1503,共6页
The introduction of oxofluoride anion into anionic group assists to tune optical properties owing to the change of coordination,electronegativity,and according anionic framework.Here,we proposed a rational design of n... The introduction of oxofluoride anion into anionic group assists to tune optical properties owing to the change of coordination,electronegativity,and according anionic framework.Here,we proposed a rational design of new compounds by fluorine-driven structure and optical property evolution.A new borophosphate Ba_(2)BP_(3)O_(11)with the monoclinic space group P2_(1/c) has been synthesized in the sealed system.Ba_(2)BP_(3)O_(11)exhibits a rare P-O-P bridge formation,which is the first example in alkaline-earth metal borophosphates.By further substituting[BO_(4)]^(3-)with[BO_(3)F]^(4-),the first alkaline-earth metal/lead fluoroborophosphates M_(2)BP_(2)O_(8)F(M=Ba and Pb)with the same space group were designed.Since the scissors effect of fluorine,in M_(2)BP_(2)O_(8)F(M=Ba and Pb),a BO_(3)F tetrahedron corner-sharing with three PO_(4)tetrahedra forms 1D chains along the b-axial direction,which are filled by MO_(n)(M=Ba/Pb,n=5,6,8)distorted polyhedra.The first principles calculation shows that the borophosphate Ba_(2)BP_(3)O_(11)has a birefringence about 0.013@1,064 nm,while the fluoroborophosphates M_(2)BP_(2)O_(8)F(M=Ba and Pb)have the values of 0.035 and 0.043@1,064 nm,respectively.Such an apparent enhancement in birefringence is derived from synergies of the oxyfluoride and cation.The introduction of fluorine-containing heteroanionic groups provides a feasible strategy to design novel promising optical materials. 展开更多
关键词 BOROPHOSPHATE fluoroborophosphates P-O-P bridges formation BIREFRINGENCE
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The inflammatory microenvironment and the urinary microbiome in the initiation and progression of bladder cancer 被引量:1
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作者 Xingxing Huang Ting Pan +13 位作者 Lili Yan Ting Jin ruonan zhang Bi Chen Jiao Feng Ting Duan Yu Xiang Mingming zhang Xiaying Chen Zuyi Yang Wenzheng zhang Xia Ding Tian Xie Xinbing Sui 《Genes & Diseases》 SCIE 2021年第6期781-797,共17页
Accumulating evidence suggests that chronic inflammation may play a critical role in various malignancies,including bladder cancer.This hypothesis stems in part from inflammatory cells observed in the urethral microen... Accumulating evidence suggests that chronic inflammation may play a critical role in various malignancies,including bladder cancer.This hypothesis stems in part from inflammatory cells observed in the urethral microenvironment.Chronic inflammation may drive neoplastic transformation and the progression of bladder cancer by activating a series of in-flammatory molecules and signals.Recently,it has been shown that the microbiome also plays an important role in the development and progression of bladder cancer,which can be mediated through the stimulation of chronic inflammation.In effect,the urinary microbiome can play a role in establishing the inflammatory urethral microenvironment that may facilitate the development and progression of bladder cancer.In other words,chronic inflammation caused by the urinary microbiome may promote the initiation and progression of bladder cancer.Here,we provide a detailed and comprehensive account of the link between chronic inflammation,the microbiome and bladder cancer.Finally,we highlight that targeting the urinary microbiome might enable the development of strategies for bladder cancer prevention and personalized treatment. 展开更多
关键词 Bladder cancer Carcinogenesis Inflammatory microenvironment Pathogenesis PROGRESSION Urinary microbiome
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