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目的：运用网络药理学和分子对接技术探讨罗汉果治疗糖尿病的作用机制。方法：通过TCMSP平台和Swiss Target Prediction数据库筛选出罗汉果的活性成分及其靶点;利用GeneCard、TTD、OMIM数据库筛选出糖尿病潜在靶点;采用Cytoscape 3.7.2软件构建药物-活性成分-疾病-靶点的可视化网络;通过STRING数据库对关键靶点构建蛋白质-蛋白质相互作用（PPI）网络;利用Metascape数据库进行基因本体（GO）功能以及京都基因与基因组百科全书（KEGG）通路富集分析;利用Autodock4和Pymol软件对关键活性成分和关键靶点进行分子对接分析和可视化。结果：筛选出有效成分18种,糖尿病靶点146个。GO功能富集分析得到GO条目572条,KEGG通路富集分析得到信号通路167条。分子对接结果显示β-谷甾醇、山柰酚、罗汉果醇等关键活性成分与原癌基因酪氨酸蛋白激酶（SRC）等关键靶点的亲和力较高。结论：罗汉果通过多靶点、多通路发挥抗糖尿病的作用,其关键活性成分通过与SRC、丝氨酸/苏氨酸蛋白激酶1（AKT1）、丝裂原活化蛋白激酶3（MAPK-3）等靶点调节晚期糖基化终末产物-糖基化终末产物受体（AGE-RAGE）、缺氧诱导因子1（HIF-1）、磷脂酰肌醇-3-激酶/蛋白激酶（PI3K-Akt）等信号通路起到治疗糖尿病的作用。 相似文献
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目的：基于网络药理学探讨肾复舒颗粒治疗慢性肾衰竭的相关靶点及其作用机制。方法：采用多个数据库获取肾复舒颗粒的化学成分、活性成分靶点及慢性肾衰竭的疾病靶点，获取药物-疾病的共同靶点，构建药物靶点-疾病靶点的蛋白质-蛋白质相互作用（PPI）网络以及核心靶点；对潜在作用靶点进行基因本体（GO）功能、京都基因与基因组百科全书（KEGG）通路富集分析；蛋白质免疫印迹实验检测5/6肾切除模型大鼠肾脏组织中磷酸化信号转录活化因子3（p-stat3）/信号转录活化因子3（stat3）以及抑癌基因（p53）蛋白的表达。结果：肾复舒颗粒共含有122个潜在活性成分，其对应872个药物靶点；共获得慢性肾衰竭的疾病靶点1159个；二者取交集后获得药物-疾病共同靶点137个。拓扑分析结果显示非受体酪氨酸激酶（SRC）、信号传导和转录激活因子3（STAT3）、p53、磷脂酰肌醇-4，5-二磷酸肌醇-3-激酶（PIK3CA）、丝裂原活化蛋白激酶1（MAPK1）等蛋白为核心靶点。GO功能富集分析结果显示肾复舒颗粒的作用靶点与基因表达的正向调控、MAPK激酶活性的正向调控、负调节凋亡过程有关。KEGG通路富集分析结果显示肾复舒颗粒的作用靶点与糖尿病并发症的晚期糖基化终产物及其受体（AGE-RAGE）信号通路、低氧诱导因子-1（HIF-1）信号通路、流体剪切应力和MAPK信号通路有关。动物实验结果表明肾复舒颗粒可抑制p-stat3/stat3以及p53的表达。结论：肾复舒颗粒可通过多成分、多靶点和多通路治疗慢性肾衰竭。 相似文献
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目的：通过网络药理学方法结合分子对接技术研究半夏泻心汤治疗反流性食管炎（RE）的潜在有效成分及分子作用机制。方法：利用中药系统药理学数据库和分析平台（TCMSP）查找半夏泻心汤活性成分和药物潜在靶点。基于GeneCards、OMIM、DrugBank和TTD数据库获取RE疾病靶点,使用R语言4.0.4得到药物和疾病的交集靶点。采用Cytoscape 3.8.0分析软件筛选并构建“中药-活性成分-靶点”网络,结合STRING数据库对交集靶点进行蛋白互作网络分析,使用R软件进行GO功能富集分析和KEGG通路富集分析。利用AutoDock Vina 1.1.2对关键活性成分与作用靶点进行分子对接验证。结果：半夏泻心汤治疗RE共收集到162个活性化学成分和151个靶点,Cytoscape 3.8.0软件筛选出Jun激酶（JUN）、信号传导与转录激活因子3（STAT3）、MYC基因（MYC）、丝裂原活化蛋白激酶3（MAPK3）、肿瘤蛋白p53（TP53）、丝裂原活化蛋白激酶14（MAPK14）、蛋白激酶（AKT1）、丝裂原活化蛋白激酶8（MAPK8）、核转录因子-κB/p65（RELA）、丝裂原活化蛋白激酶1（MAPK1）、肿瘤坏死因子（TNF）、细胞周期蛋白D1（CCND1）等核心靶点和槲皮素、山柰酚、汉黄芩素、柚皮素、黄芩素等关键活性成分。GO富集条目2740个,包括2470个生物过程、84个细胞组成和186个分子功能;KEGG通路富集得到糖尿病并发症中的晚期糖基化终产物-晚期糖基化终产物受体、白细胞介素17、TNF、p53和缺氧诱导因子-1等信号通路。分子对接结果显示半夏泻心汤的关键活性成分可以对JUN、STAT3、MYC、MAPK3、TP53、MAPK14、AKT1、MAPK8等核心靶点产生调控作用。结论：半夏泻心汤可以通过多成分、多靶点、多通路治疗RE,为半夏泻心汤治疗RE作用机制的进一步阐明提供了指引。 相似文献
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目的：运用网络药理学和分子对接技术探析养心活血通脉汤治疗稳定性冠心病的作用机制。方法：应用TCMSP、Herb、TCMID平台检索养心活血通脉汤成分及作用靶点;经GeneCards、OMIM、DisGeNET平台获取稳定性冠心病靶点;运用Cytoscape 3.9.1建立“药物-活性成分-靶点”网络及蛋白质-蛋白质相互作用（PPI）网络,筛选核心靶点。由Metascape平台进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析。利用Auto Dock Tools软件进行有效成分与和核心靶点分子对接。结果：养心活血通脉汤治疗稳定性冠心病主要成分为槲皮素、山柰酚、β-谷甾醇、芒柄花黄素、黄芩素、丹参酮ⅡA,关键靶点为肿瘤坏死因子（TNF）、白细胞介素-6（IL-6）、丝氨酸/苏氨酸激酶1（AKT1）、白细胞介素-1β（IL-1β）、血管内皮生长因子（VEGFA）,关键通路为脂质和动脉粥样硬化（Lipid and atherosclerosis）、磷脂酰肌醇3激酶-丝氨酸/苏氨酸蛋白激酶1信号通路（PI3K-Akt信号通路）、肿瘤坏死因子信号通路（TNF信号通路）、丝裂原活化蛋白激酶信号通路（MAPK信号通路）、糖基化终产物/受体信号通路（AGE-RAGE信号通路）等。分子对接结果显示各有效成分与各核心靶点结合活性较好。结论：养心活血通脉汤治疗稳定性冠心病作用机制主要为降脂、抗动脉粥样硬化、抗炎、抗心肌损伤。 相似文献
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目的：通过网络药理学及分子对接技术探讨全真一气汤治疗慢性阻塞性肺疾病（COPD）的作用机制。方法：通过TCMSP、ETCM筛选全真一气汤活性成分,利用TCMSP和Swiss Target Prediction数据库预测潜在靶点,通过GeneCards、DisGeNET、DrugBank数据库收集COPD靶点,并取疾病及药物靶点交集。利用Cytoscape 3.9.1软件构建药物-成分-靶点可视化网络,利用STRING平台构建交集靶点的蛋白质-蛋白质相互作用（PPI）网络图并筛选核心靶点,利用Metascape平台对交集靶点进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析。关键成分和核心靶点蛋白采用Auto Dock Vina进行分子对接。结果：筛选得到全真一气汤有效成分44种,作用靶点295个,疾病靶点1865个,核心靶点为转录激活因子3（STAT3）、肉瘤基因（SRC）、丝氨酸/苏氨酸蛋白激酶1（AKT1）、肿瘤蛋白p53（TP53）、丝裂原活化蛋白激酶1（MAPK1）、染色体基因（JUN）、人雌激素受体α（ESR1）;GO功能主要涉及对无机物的反应、蛋白激酶活性、膜筏等,KEGG信号通路主要涉及磷脂酰肌醇-3-激酶-蛋白激酶B（PI3K-Akt）、丝裂原活化蛋白激酶（MAPK）、肿瘤坏死因子（TNF）等;分子对接结果显示关键成分与核心靶点结合较好。结论：全真一气汤可通过多成分、多靶点、多途径治疗COPD,本研究结果为中医药治疗COPD的实验研究提供了参考。 相似文献
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目的：基于网络药理学和分子对接研究加减蠲痰方治疗多囊卵巢综合征（PCOS）的作用机制。方法：通过TCMSP数据库获取加减蠲痰方的药物有效成分及作用靶点;利用GeneCards、OMIM等数据库筛选PCOS相关靶点;通过微生信平台获得加减蠲痰方与PCOS的交集靶点。利用Cytoscape 3.7.1软件构建药物、靶点与疾病之间的关系网络。应用STRING数据库构建交集靶点的蛋白质-蛋白质相互作用（PPI）网络,并运用Metascape数据库进行基因本体（GO）功能、京都基因与基因组百科全书（KEGG）通路富集分析。利用分子对接技术验证关键成分与核心靶点的对接能力。结果：获得山柰酚、豆甾醇、异鼠李素、汉黄芩、柚皮素等96种活性成分,有丝分裂激活蛋白激酶3（MAPK3）、细胞肿瘤抗原p53（TP53）、有丝分裂激活蛋白激酶1（MAPK1）、转录因子AP-1、蛋白激酶B1等126个交集靶点以及磷脂酰肌醇3-激酶/蛋白激酶B、丝裂原激活的蛋白激酶、肿瘤坏死因子、转录因子、糖尿病并发症中的晚期糖基化终产物及其受体（AGE-RAGE）信号通路。槲皮素与9个关键靶点均可良好结合,结果排前3位的靶点为MAPK3、TP53、MAPK1。结论：加减蠲痰方治疗PCOS具有多成分、多靶点、多通路的特点,可能通过改善胰岛素抵抗、抑制颗粒细胞自噬并促进卵泡发育、减轻排卵障碍、促进细胞凋亡、调控血糖稳态、调节激素水平、抗炎等药理作用来调治PCOS,为后期进一步研究提供理论依据。 相似文献
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目的：通过网络药理学和分子对接技术对“蒲黄-姜黄”抗动脉粥样硬化的作用机制进行探讨。方法：基于TCMSP数据库获取“蒲黄-姜黄”的有效活性成分及靶点,通过OMIM、GeneCards、DisGeNet、DrugBank数据库挖掘动脉粥样硬化的潜在靶点,将药物与疾病靶点取交集后,利用STRING数据库进行蛋白质-蛋白质相互作用（PPI）分析,使用R语言进行基因本体（GO）功能及京都基因与基因组百科全书（KEGG）通路富集分析,最后使用PyMOL、AutoDock Vina进行分子对接。结果：共筛选出“蒲黄-姜黄”有效成分9个,与动脉粥样硬化相关靶点190个,核心靶点为转录因子激活蛋白1（JUN）、肿瘤蛋白P53（IP53）、丝裂原激活蛋白激酶1（MAPK1）、苏氨酸蛋白激酶（AKT1）等。GO功能富集分析显示生物过程有2438个、细胞组分有97个、分子功能有252个,共计2787个GO功能条目。KEGG通路富集筛选得到信号通路170条,主要涉及血脂和动脉粥样硬化、流体剪切应力和动脉粥样硬化等。分子对接显示各个成分与靶点均能较好地结合,其中AKT1靶点与这些成分的结合强度最佳。结论：“蒲黄-姜黄”可以多成分、多靶点、多通路地抗动脉粥样硬化。 相似文献
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目的：通过网络药理学和分子对接技术,探讨黄芪-白花蛇舌草抗非小细胞肺癌（NSCLC）的潜在活性成分和作用机制。方法：利用TCMSP和Uniprot数据库获取黄芪-白花蛇舌草的主要活性成分及靶点基因;GeneCards、OMIM数据库获取NSCLC靶点基因;绘制韦恩图得到疾病和活性成分共同靶点;STRING数据库构建中药成分靶蛋白-疾病靶蛋白的蛋白质-蛋白质相互作用（PPI）网络;Cytoscape 3.9.1软件绘制成分-靶点网络图,通过网络拓扑分析筛选出关键靶点及成分;DAVID数据库及Bioinformatics平台进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析;PyMol软件和AotoDock软件绘制相应的分子对接图。结果：经筛选共得到653个黄芪-白花蛇舌草活性成分靶点和6178个疾病靶点,两者交集靶点154个。GO功能富集到747个生物过程、83个分子功能和150个细胞组分,KEGG通路富集分析得到167条信号通路。分子对接结果显示,PTGS1蛋白与活性成分槲皮素、山柰酚、芒柄花黄素均结合稳定。结论：黄芪-白花蛇舌草可能通过槲皮素、山柰酚、芒柄花黄素等成分,PTGS1、丝氨酸/苏氨酸蛋白激酶（AKT1）、白细胞介素-6（IL-6）等靶点,丝裂原激活的蛋白激酶（MAPK）、磷脂酰肌醇3 激酶-蛋白激酶 B（PI3K-Akt）等信号通路治疗NSCLC,初步预测了黄芪-白花蛇舌草对NSCLC的作用机制,为深入揭示其治疗NSCLC的分子机制提供了理论基础。 相似文献
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目的：运用网络药理学与分子对接技术探究六味地黄丸治疗肾阴亏虚型老年性便秘的作用机制。方法：通过TCMSP、TCMID、SwissTargetPrediction获取药物的活性成分并筛选,在Genecards、OMIM、TTD、DisGeNET数据库检索与该疾病相关的主要靶点;运用韦恩图获取六味地黄丸与老年性便秘的交集靶点。将以上数据通过STRING获得交集靶点的蛋白网络,构建药物-活性成分-靶点及蛋白质-蛋白质相互作用（PPI）网络图,进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析,并对药物有效成分和核心靶点进行分子对接验证。结果：共获得58个有效活性成分和675个对应靶点,主要有效成分有槲皮素、羟基芫花素、泽泻醇B等;药物-疾病交集靶点296个,包括丝氨酸/ 苏氨酸蛋白激酶 1 (AKT1)、肿瘤坏死因子（TNF）、白细胞介素-6（IL-6）等。GO功能富集共有3175个条目,KEGG通路富集得到215条通路,主要有癌症通路、磷脂酰肌醇3-激酶/苏氨酸蛋白激酶信号通路、癌症中的蛋白聚糖、丝裂原活化蛋白激酶信号通路等。分子对接显示该药物主要有效成分和核心靶点蛋白有较好的结合力。结论：该研究在总体上预测了六味地黄丸治疗肾阴亏虚型老年性便秘的活性成分、靶点和信号通路,表明了其多成分-多靶点-多途径的治疗特点。 相似文献
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目的：通过网络药理学方法探析板蓝根-山豆根-白茅根治疗银屑病的作用机制。方法：应用 TCMSP 平台检索板蓝根-山豆根-白茅根的化学成分,利用GeneCards等数据库检索银屑病的相关靶点基因,将药物靶点与疾病靶点取交集绘制韦恩图。运用Cytoscape 3.8.2软件构建药物-成分-靶点网络图,构建蛋白质-蛋白质相互作用（PPI）网络图,对交集靶点进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析。结果：共获有效成分52种,如β-谷甾醇、槲皮素、山柰酚等;与银屑病相关靶点90个,其中白细胞介素-6、肿瘤坏死因子、肿瘤蛋白p53、白细胞介素-1β、活化蛋白-1等为核心基因;GO功能富集分析中共确定了614条GO条目,其中生物过程480条、细胞组分52条、分子功能82条;KEGG富集分析中共确定了102条通路,涉及多种癌症通路、肝炎、磷脂酰肌醇3-激酶（PI3K）-丝氨酸-苏氨酸-激酶（Akt）信号、肿瘤坏死因子信号、丝裂原活化蛋白激酶等信号通路。结论：板蓝根-山豆根-白茅根可通过多种活性成分、多个靶点、多条通路抑制炎症因子的表达及角质细胞增殖、分化而发挥治疗作用。 相似文献
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《中国海洋工程》2021,(3)
Wave forces acting on a vertical cylinder at different locations on a slope beach in the near-shore region are investigated considering solitary waves as incoming waves. Based on the Reynolds-averaged Navier-Stokes equations and the k-ε turbulence model, wave forces due to the interaction between the solitary wave and cylinder are simulated and analyzed with different incident wave heights and cylinder locations. The numerical results are first compared with previous theoretical and experimental results to validate the model accuracy. Then, the wave forces and characteristics around the cylinder are studied, including the velocity field, wave surface elevation and pressure. The effects of relative wave height, Keulegan-Carpenter(KC) number and cylinder locations on the wave forces are also discussed. The results show that the wave forces exerted on a cylinder exponentially increase with the increasing incident wave height and KC number. Before the wave force peaks, the growth rate of the wave force shows an increasing trend as the cylinder moves onshore. The cylinder location has a notable effect on the wave force on the cylinder in the near-shore region. As the cylinder moves onshore, the wave force on the cylinder initially increases and then decreases. For the cases considered here, the maximum wave force appears when the cylinder is located one cylinder diameter below the still-water shoreline. Furthermore, the fluid velocity peaks when the maximum wave force appears at the same location. 相似文献
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A New Model for Ice Forces on A Conical Structure 总被引：1，自引：0，他引：1
The ice force is an important factor to be taken into account for offshore structures in cold regions, and the calculation method of the ice force is meaningful for the offshore structure design. The cone is now used as an optimal ice-resistant structure because it can cause bending failure of the ice sheet. The interaction between an ice sheet and a conical structure is studied in this paper and Croasdale‘s model is modified based on field observations. The newly built model separates the ice sheet into the emersed part and the floating part, and the equilibrium analyses are canied out respectively. The bending moment distribution of the ice sheet is analyzed for the determination of the position of bending failure, which serves as a supplementary restraint. The analytic solution of the ice foree on a conical structure is obtained it is verified with the experimental data of previous researches. 相似文献
14.
An edge wave is a kind of surface gravity wave basically travelling along a shoaling beach. Based on the periodic assumption in the longshore direction, a second order ordinary differential equation is obtained for numerical simulation of the cross-shore surface elevation. Given parameters at the shoreline, a cross-shore elevation profile is obtained through integration with fourth-order Runge-Kutta technique. For a compound slope, a longshore wavenumber is obtained by following a geometrical approach and solving a transcendental equation with an asymptotic method. Numerical results on uniform and compound sloping beaches with different wave periods, slope angles, modes and turning point positions are presented. Some special scenarios, which cannot be predicted by analytical models are also discussed. 相似文献
15.
Two kinds of the empirical orthogonal function analysis method for decomposing the mean-field are developed and a comparison is made between them. It is proved that the mean-field can be decomposed using eigenvectors obtained from anomaly-field decomposition, and that more information can be obtained. An example of sea bottom mean temperature analysis shows its remarkable effect in depicting the distribution features of various factors, such as cold water mass, currents and radiation.A few problems concerning the efficiency of the method are discussed and two matrices of relationship which represent the space-time characteristics of the field are derived. The formulae of space-time transformation are obtained conveniently. 相似文献
16.
Makoto Kashiwai 《Journal of Oceanography》1985,41(1):11-24
Tidal exchange through a narrow entrance channel was studied experimentally with the use of a simplified hydraulic model. The inflowing water mass, visualized with dye solution, exhibits the shape of a starting plume with a starting vortex pair at its head. Because of their periodical formation by the tide, these are called the tidal plume and tidal vortex pair. The axis of the tidal plume deflects and undulates with a period 2 to 9 times that of the tide. Together with this undulation, the vortex pair becomes asymmetric. A circulating flow is formed in the bay which affects the shape of the inflowing and outflowing water masses. A part of the inflowing water mass flows out during the subsequent ebb, and this outflowing portion can be divided into two parts. One is the water remaining in the entrance channel at high water which flows out during the first half of the subsequent ebb and the other is the water flowing round the bay in the circulating flow during flood that flows out during the latter half of the subsequent ebb. Both contribute to the exchange ratio, but we can estimate an upper limit for the exchange ratio by neglecting the latter outflow. This neglected portion is considered in the concept of the age composition of outflowing water. The age composition of the bay water shows the existence of intermittent effluence superposed on a trend in the age composition that is similar to that of the well-mixed case. From the analysis of a model consisting of a number of mixing tanks connected in series with a recycle flow, it is concluded that this intermittent effluence occurs in the case of weak mixing due to the effect of circulating flow in the bay but is negligible in the case of strong mixing. 相似文献
17.
18.
沿岸水深测量技术方法的探讨 总被引：4，自引：3，他引：4
对沿岸水深测量各种技术方法进行了探讨，对各种技术方法的特点进行了阐述，根据海岸带图测量水域为沿岸浅水区的特点和当前测深技术及装备的情况，对水深测量方案的选择给出结论。 相似文献
19.
Joseph M. Bishop 《Ocean Engineering》1979,6(3):273-284
A simple operationally oriented model of surface wind-driven currents is presented in which Lagrangian surface drift is assumed to be composed of a linear combination of a wave-induced Stokes drift plus a wind-driven Ekman drift. Using this approach, Stokes drift accounts for as much as half the total surface current magnitude. The Lagrangian current is predicted to be about 3.5% of the 10 m wind magnitude directed in the sense of an Ekman spiral about a 20° deviation angle. For comparison to this model, a second model is proposed that accounts for the interaction of Stokes current and Coriolis force. An inference drawn from this model is that there is only weak coupling between Coriolis force and Stokes drift. Such a conclusion, if correct, leads one to focus attention on the Lagrangian model for operationally oriented current estimates. Results of the Lagrangian model agree with observations of investigators for currents at the air-sea interface and may have application in the movement f oil slicks or surface drifters at sea under fetch or duration limited sea states. 相似文献