基于网络药理学探讨白花蛇舌草-半枝莲抗肝细胞癌的作用机制

[目的]基于网络药理学探讨白花蛇舌草-半枝莲药对治疗肝细胞癌的潜在靶点及作用机制。[方法]利用中药系统药理学数据库与分析平台(Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform,TCMSP)检索白花蛇舌草和半枝莲活性成分,导入Drugbank数据库进行蛋白靶点匹配,使用GeneCards数据库、人类在线孟德尔遗传(Online Mendelian Inheritance in Man,OMIM)数据库、治疗目标数据库(Therapeutic Target Database,TTD)、Drugbank、肝细胞癌肿瘤数据库(Oncogenomic Database of Hepatocellular Carcinoma,OncoDB.HCC)和Liverome数据库等获取肝细胞癌相关靶点,运用Cytoscape构建“药物-活性成分-靶点”网络,String数据库构建蛋白相互作用(protein-protein interaction,PPI)网络,并通过网络拓扑分析筛选关键成分及核心靶点,最后利用R语言及Cluego对预测得到的核心靶点进行基因本体(gene ontology,GO)和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)富集分析。[结果]白花蛇舌草-半枝莲药治疗肝细胞癌的潜在靶点 89个,通过网络拓扑分析筛选得到6个核心靶点、5种关键成分。GO功能富集分析显示,白花蛇舌草-半枝莲药对主要参与细胞增殖、细胞凋亡、炎症反应和血管生成等生物学途径。KEGG通路富集分析显示,p53抑癌基因通路、磷脂酰肌醇3-激酶/蛋白激酶B(phosphatidylinositol-3-kinase/protein kinase B,PI3K-Akt)通路、缺氧诱导因子-1(hypoxia inducible factor-1,HIF-1)通路、核因子-κB(nuclear factor-κB,NF-κB)通路、血管内皮生长因子(vascular endothelial growth factor,VEGF)通路等是其关键信号通路。[结论]白花蛇舌草-半枝莲药对中有效成分主要是槲皮素、木犀草素、β-谷甾醇等,通过调节p53、PI3K-Akt、HIF-1、NF-κB和VEGF等信号通路抑制肝癌细胞增殖,并促进细胞凋亡,减少炎症反应,抑制血管生成,从而实现对肝细胞癌的治疗作用。     

香兰素衍生物VND3207对不同LET辐射致质粒DNA损伤的防护作用

目的 评价不同LET辐射致DNA损伤以及药物的防护作用.方法 分别以60Co γ射线、质子束、7Li重离子束照射溶液状态超螺旋构象质粒DNA,通过琼脂糖凝胶电泳分析DNA分子构象变化,检测DNA损伤程度及VND3207的防护作用.结果 质子和7Li重离子体外所致质粒DNA损伤明显比γ射线严重.药物VND3207能够有效减轻所观察的3种不同LET辐射对质粒DNA的损伤,加药组与不加药组相比,质粒DNA开环构象显著减少,保护效果随着药物浓度的增加更加明显.200 μmol/L浓度对50 Gy γ射线、质粒和7Li重离子辐照质粒DNA损伤的保护效果(质粒超螺旋构象百分比)分别为85.3%(t=3.70,P=0.033)、73.3%(t=10.58,P=0.017)和80.4%(t=8.57,P=0.008).可见VND3207对重离子辐射损伤的保护效应尤为显著,明显优于质子辐照损伤.结论 药物VND3207对辐射DNA损伤具有较好的保护作用,特别是对γ射线和重离子辐射损伤的保护作用更为明显.

Abstract：

Objective To evaluate the radioprotective effect of vanillin derivative VND3207 on DNA damage induced by different LET ionizing radiation.Methods The plasmid DNA in liquid was irradiated by 60Co γ-rays, proton or 7Li heavy ion with or without VND3207.The conformation changes of plasmid DNA were assessed by agarose gel electrophoresis and the quantification was done using gel imaging system.Results The DNA damage induced by proton and 7Li heavy ion was much more serious as compared with that by 60Co γ-rays, and the vanillin derivative VND3207 could efficiently decrease the DNA damage induced by all three types of irradiation sources, which was expressed as a significantly reduced ratio of open circular form (OC) of plasmid DNA.The radioprotective effect of VND3207 increased with the increasing of drug concentration.The protective efficiencies of 200 μmol/L VND3207 were 85.3% (t =3.70,P =0.033), 73.3% (t = 10.58, P =0.017)and 80.4% (t =8.57,P =0.008)on DNA damage induction by 50 Gy of γ-rays, proton and 7Li heavy ion, respectively.It seemed that the radioprotection of VND3207 was more effective on DNA damage induced by high LET heavy ion than that by proton.Conclusions VND3207 has a protective effect against the genotoxicity of different LET ionizing radiation, especially for γ-rays and 7 Li heavy ion.     

18F-FDG PET/CT显像在胃癌分期鉴别及预后评估中的价值研究

目的:探讨¹⁸F-FDGPET/CT显像在胃癌分期鉴别及预后评估中的临床价值。方法:选取医院收治的53例胃癌患者,均行CT增强和¹⁸F-FDGPET/CT显像检查,将CT图像资料纳入对照组,¹⁸F-FDGPET/CT显像资料纳入观察组。以病理组织学结果为金标准,对比两组显像方法对胃癌分期鉴别和预后评估的准确率,采用卡方检验进行组间差异性比较。结果:临床病理组织学检查结果显示,53例患者中胃癌Ⅰ期、Ⅱ期、Ⅲ期、Ⅳ期分别为5例(占9.43%)、12例(占22.64%)、20例(占37.74%)和16例(占30.19%)。对照组和观察组对胃癌分期的诊断准确率分别为47.17%(25/53)和71.70%(38/53),组间差异有统计学意义(x²=6.613,P<0.05);对照组和观察组对胃癌术后复发的诊断准确率分别为81.13%(43/53)和94.34%(50/53),组间差异有统计学意义(x²=4.296,P<0.05);对照组和观察组对胃癌患者肿瘤转移的诊断准确率分别为66.04%(35/53)和90.57%(48/53),组间差异有统计学意义(x²=9.384,P<0.05)。结论:¹⁸F-FDGPET/CT能够较准确地检测胃癌病灶浸润胃壁深度和识别胃周淋巴结转移程度,并对其他器官组织的转移情况诊断效果好,在胃癌的诊疗中表现出较高的临床价值。     

真武汤中不同附子剂量对肾病综合征大鼠蛋白代谢及疗效影响的研究

目的:探讨真武汤中不同附子剂量对肾病综合征(Nephrotic syndrome,NS)大鼠疗效的影响,并研究其作用机制。方法:50只大鼠随机分成附子高剂量组、附子中剂量组、附子低剂量组、模型组、空白组,每组10只,除空白组外,其余大鼠按5 mg/kg的剂量一次性尾静脉注射阿霉素溶液构建NS模型,第3周末检测造模是否成功。附子高、中、低剂量组大鼠每天给予含附子生药1.52 g/kg、0.92 g/kg、0.52 g/kg的真武汤灌胃,模型组和空白组予等量生理盐水灌胃,均灌胃4周,第7周末检测各组大鼠的24 h尿蛋白、血清白蛋白(Serum albumin,Alb)、尿素氮(Blood urea nitrogen,BUN)、肌酐(Serum creatinine,SCr)含量。结果:与空白组比较,模型组3周后24 h尿蛋白明显升高(P 0.01);与模型组比较,附子高、中剂量组NS大鼠的精神、活动、毛色、摄食量等状况显著改善,24 h尿蛋白、BUN、SCr明显降低,血清白蛋白升高(P 0.05,P 0.01),附子低剂量组效果不明显。结论:附子高、中、低剂量组均能降低NS大鼠24 h尿蛋白、血清BUN、SCr,升高Alb,且附子高剂量组效果更为显著。