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Polymyxin resistance caused by large-scale genomic inversion due to IS26 intramolecular translocation in Klebsiella pneumoniae

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药学学报:英文版 2023年第9期13卷 3678-3693页

作者： Haibin Li Lang Sun Han Qiao Zongti Sun Penghe Wang chunyang xie Xinxin Hu Tongying Nie Xinyi Yang Guoqing Li Youwen Zhang Xiukun Wang Zhuorong Li Jiandong Jiang Congran Li Xuefu You Beijing Key Laboratory of Antimicrobial Agents Institute of Medicinal BiotechnologyChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China Institute of Medicinal Biotechnology Chinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100050China State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100050China

Polymyxin B and polymyxin E(colistin)are presently considered the last line of defense against human infections caused by multidrug-resistant Gram-negative organisms such as carbapenemase-producer Enterobacterales,Acinetobacter baumannii,and Klebsiella pneumoniae.Yet resistance to this last-line drugs is a major public health threat and is rapidly increasing.Polymyxin S2(S2)is a polymyxin B analogue previously synthesized in our institute with obviously high antibacterial activity and lower toxicity than polymyxin B and colistin.To predict the possible resistant mechanism of S2for wide clinical application,we experimentally induced bacterial resistant mutants and studied the preliminary resistance mechanisms.Mut-S,a resistant mutant of K.pneumoniae ATCC BAA-2146(Kpn2146)induced by S2,was analyzed by whole genome sequencing,transcriptomics,mass spectrometry and complementation experiment.Surprisingly,large-scale genomic inversion(LSGI)of approximately 1.1 Mbp in the chromosome caused by IS26mediated intramolecular transposition was found in Mut-S,which led to mgrB truncation,lipid A modification and hence S2resistance.The resistance can be complemented by plasmid carrying intact mgrB.The same mechanism was also found in polymyxin B and colistin induced drug-resistant mutants of Kpn2146(Mut-B and Mut-E,respectively).This is the first report of polymyxin resistance caused by IS26 intramolecular transposition mediated mgrB truncation in chromosome in K.pneumoniae.The findings broaden our scope of knowledge for polymyxin resistance and enriched our understanding of how bacteria can manage to survive in the presence of antibiotics.

关键词： Klebsiella pneumoniae Polymyxin resistance mgrB IS26 Whole genome sequencing Structural variation Inversion

加权基因共表达网络分析结合机器学习算法筛选与腹主动脉瘤免疫相关的关键基因

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血管与腔内血管外科杂志 2024年第3期10卷 296-302页

作者：杨树张娣谢春杨哈尔滨医科大学附属第四医院血管外科黑龙江哈尔滨150000 黑龙江中医药大学附属第二医院妇科黑龙江哈尔滨150000

目的探讨腹主动脉瘤(AAA)免疫相关的关键基因。方法从基因表达综合数据库(GEO)中获取AAA组织与健康人群正常腹主动脉组织的转录组数据,通过单样本基因集富集分析(ssGSEA)计算免疫细胞浸润分数,使用加权基因共表达网络分析(WGCNA)结合... 详细信息

目的探讨腹主动脉瘤(AAA)免疫相关的关键基因。方法从基因表达综合数据库(GEO)中获取AAA组织与健康人群正常腹主动脉组织的转录组数据,通过单样本基因集富集分析(ssGSEA)计算免疫细胞浸润分数,使用加权基因共表达网络分析(WGCNA)结合机器学习算法筛选与AAA免疫浸润相关的关键基因,使用STRING数据库进行蛋白-蛋白互作分析,采用受试者工作特征(ROC)曲线分析目的基因对于AAA的诊断能力。结果与健康人群腹主动脉组织相比,AAA组织中活化的CD4^(+)T细胞浸润分数升高,差异有统计学意义(P﹤0.05)。WGCNA分析获得1215个与活化的CD4^(+)T细胞浸润相关的基因,差异基因表达分析得出990个AAA组织和健康人群正常腹主动脉组织表达差异的基因,将差异基因表达分析得到的基因与WGCNA中所得的基因进行交集后得到282个与CD4^(+)T细胞浸润相关的差异基因。将282个差异基因进行基因本体论(GO)、京都基因与基因组百科全书(KEGG)富集分析,生物过程(BP)富集分析表明,这些基因与有机化合物氧化的能量衍生、细胞呼吸、线粒体呼吸链复合物组装、烟酰胺腺嘌呤二核苷酸(NADH)脱氢酶复合物装配和线粒体呼吸链复合体I装配等生物过程有关;分子功能(MF)富集分析表明,这些基因与氧化还原相关的分子学功能有关;细胞成分(CC)富集分析表明这些分子表达与线粒体组分相关。KEGG富集分析显示,这些基因与神经系统疾病、非酒精性脂肪肝、氧化磷酸化等信号通路有关。通过向量机-相对误差过滤(SVM-REF),LASSO逻辑回归和随机森林模型3种机器学习算法从282个与活化的CD4^(+)T细胞浸润相关的差异基因中获得了4个Hub基因(VCAN、CUTL1、TRAPPC4和LOC646782)。ROC曲线分析表明这些Hub基因具备诊断AAA的潜力。结论通过WGCNA结合机器学习算法分析鉴定出与AAA发病相关的4个Hub基因(VCAN、CUTL1、TRAPPC4和LOC646782),以上4个Hub基因为临床早期诊断AAA提供帮助,并且为进一步研究AAA的发病机制奠定了基础。

关键词：腹主动脉瘤免疫微环境 CD4^(+)T细胞生物信息学

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四川省樟科一新记录种——红楠

四川林业科技 2024年第1期45卷 133-134页

作者：高刚蔡义平谢纯洋手木晓英陈绪言宜宾学院农林与食品工程学部四川宜宾644000

报道了四川樟科植物新记录种——红楠(Machilus thunbergii Sieb.et Zucc.)。凭证标本存于宜宾学院植物标本室(KQ-1-012)。此次发现拓宽了该植物的分布区域,进一步丰富了四川省樟科植物物种多样性。

关键词：红楠樟科新记录四川省

In-situ One-pot Preparation of LiFePO_4/Carbon-Nanofibers Composites and Their Electrochemical Performance

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Journal of Materials Science & Technology 2011年第11期27卷 1001-1005页

作者： Jiaohui Zhang Jian xie chunyang Wu Gaoshao Cao Xinbing Zhao Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

A novel in-situ route was employed to synthesize LiFePO4/carbon-nanofibers （CNFs） composites. The route combined high-temperature solid phase reaction with chemical vapor deposition （CVD） using Fe2O3 and LiH2PO4 as the precursors for LiFePO4 growth and acetylene （C2H2） as the carbon source for CNFs growth. The composites were characterized by X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET） specific surface area, field emission scanning electron microscopy （FE-SEM）, and transmission electron microscopy （TEM）. The electrochemical performance of the composites was studied by galvanostatic cycling and cyclic voltammetry （CV）. The results showed that the in-situ CNFs growth could be realized by the catalytic effect of the Fe2O3 precursor. The sample after 80 min CVD reaction showed the best electrochemical performance, indicating a promising application in high-power Li-ion batteries.

关键词： LiFePO4/carbon-nanofibers In-situ catalytic growth 3D conductive network Electrochemical performance

Mass extinctions, their causes and consequences: an interview with Douglas H.Erwin and Shuzhong Shen

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National Science Review 2024年第1期11卷 66-70页

作者： Shucheng xie State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences at Wuhan

‘Mass extinctions’ have been a hot topic for several decades. What triggers a mass extinction? How does a mass extinction impact the evolution of life? How does our ecosystem recover after a mass extinction? These questions attracted the interest of both scientists and the public alike.NSR spoke to two renowned researchers in the field of mass extinctions: Prof. Douglas H. Erwin from the National Museum of Natural History of the USA, and Prof. Shuzhong Shen from Nanjing University, China.

关键词： Stratigraphy

Effects of Aromatherapy on Physical and Mental Health of Cancer Patients Undergoing Radiotherapy and/or Chemotherapy: A Meta-Analysis

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Chinese Journal of Integrative Medicine 2024年第5期30卷 449-457页

作者： xie Shuang-ran MA Liang XU Xin-yu ZHOU Shu xie Hui-miao xie Chang-sheng The First Clinical Medical College Zhejiang Chinese Medical UniversityHangzhou 310053China Department of Medical Oncology Hangzhou Traditional Chinese Medicine Hospital Affiliated to Zhejiang Chinese Medical UniversityHangzhou 310007China Department of Dermatology the Third Xiangya HospitalCentral South UniversityChangsha 410013China Department of Famous Chinese Medicine Clinic the Second Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou 310005China Department of Medical Oncology the First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou 310006China

Backgroup:Currently,aromatherapy is being increasingly utilized in clinical practice,particularly in managing the side effects associated with radiotherapy and chemoradiotherapy.However,it remains to be established whether aromatherapy can effectively alleviate these symptoms.Objective:To investigate the effects of aromatherapy on the physical and mental health of patients with cancer undergoing radiotherapy and chemotherapy.Methods:Seven databases were researched from inception until September 29,2023,including PubMed,Scopus,and Web of Science,Chinese National Knowledge Infrastructure,Wanfang database,China Biology Medicine disc and VIP Chinese Medical Journal Database.Review Manager version 5.3 was utilized for data analysis.The Cochrane Risk of Bias tool RoB2 was employed to evaluate the quality of the literature included in the study.Evidence quality rating was assessed using the Grading of Recommendations Assessment,Development,and Evaluation(GRADE) approach through the GRADEpro GDT online tool.Results:Nineteen studies involving 1,541 patients were included.Aromatherapy can alleviate nausea [relative risk(RR)=0.64,95% confidence interval(CI):0.53 to 0.78,Pxiety.The risk of bias was high in the included studies using the Cochrane Risk of Bias tool RoB2,and no studies were considered to be of high grade according to the GRADE system.Conclusions:Aromatherapy is an efficacious,safe and economic adjunctive therapy for cancer patien

关键词： aromatherapy cancer chemoradiotherapy physical psychological

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

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Journal of Thermal Science 2024年第1期33卷 126-137页

作者： SUN Feng xie Gongnan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection method.The existence of buoyancy force would lead to strongly anisotropic flow and thermal transport characteristics.It is closely related to the cooling performance of the engine.To elucidate the mechanisms of turbulent transport,the large eddy simulation(LES) was performed to assess turbulence statistics within different turbulence scales.The results indicated that the buoyancy and inertial force together dominated the change of turbulent structure.Moreover,the spatial thermal buoyancy effect significantly suppressed the vertical velocity fluctuation.This is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal transport.For the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,respectively.For the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more attention.The thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer deterioration.The results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LES) buoyancy force turbulence statistics

Output feedback stabilization of stochastic high-order planar nonlinear systems with stochastic inverse dynamics and output-constraint

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Science China(Information Sciences) 2024年第3期67卷 182-196页

作者： Ruiming xie Shengyuan XU School of Automation Nanjing University of Science and Technology

In this paper, we solve the output feedback control problem of stochastic high-order planar nonlinear systems with output constraint and stochastic integral input-to-state stability(SiISS) inverse dynamics. By employing a key coordinate transformation, a stochastic nonlinear system with output constraint and SiISS inverse dynamics is converted into an unconstrained system. By skillfully constructing an observer and adopting SiISS small-gain conditions, we develop a new output feedback control design and analysis method, and prove that all the closed-system signals are bounded almost surely, the output constraint is not violated almost surely, and the equilibrium point of the closed-loop system is stochastically asymptotically stable.

关键词： stochastic high-order planar nonlinear system outputconstraint stochastic inverse dynamics output feedbackstabilization stochastic integral input-to-state stability(SiISS)

Building the toolbox for in vivo glia-to-neuron reprogramming

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Neural Regeneration Research 2024年第6期19卷 1171-1172页

作者： Ye xie Bo Chen Departments of Ophthalmology and Neuroscience Icahn School of Medicine at Mount Sinai

Unlike regenerative-competent species that possess a remarkable intrinsic capacity to replenish lost neurons and restore neurocircuits spontaneously, the central nervous system in adult mammals lacks the ability to compensate for the neuronal loss caused by neurodegenerative diseases or traumatic injuries resulting in permanent loss of functionality. Inspired by earlier discoveries that radial glia or astrocytes isolated from the postnatal cortex can generate neurons,

关键词： CONVERSION DISEASE