基于肠肝轴研究栀子苷对非酒精性脂肪性肝炎大鼠的影响

目的观察栀子苷对非酒精性脂肪性肝炎(non-alcoholic steatohepatitis,NASH)大鼠的影响,并基于肠肝轴探讨栀子苷防治NASH的作用机制。方法将35只大鼠按随机数字表法分为5组,每组7只。即正常组、模型组、栀子苷组、盐酸吡格列酮组及培菲康组。除正常组外,其余28只大鼠采用高脂饮食16周建立大鼠NASH模型,在造模第9周开始给药,共治疗8周。第16周末经腹主动脉取血,生化法检测肝组织甘油三酯(TG)水平,苏木精-伊红(HE)染色观察肝组织、肠组织病理学变化。ELISA法检测肝组织白细胞介素(IL)-1β、IL-6、肿瘤坏死因子-α(TNF-α)等炎症因子的表达水平。终点显色法检测血浆内毒素(LPS)含量。结果与正常组比较,模型组大鼠的肝组织显示出典型的NASH组织学特征,经栀子苷干预后,肝细胞脂肪变性、炎症浸润较模型组减轻。与正常组比较,模型组大鼠肠上皮细胞少量脱落,肠黏膜机械屏障受损。经栀子苷干预后,回肠黏膜结构完整,未见明显肠上皮细胞脱落。与正常组比较,模型组大鼠脂肪重量、肝湿重、肝指数、肝脏TG含量、血浆LPS水平、肝组织IL-1β、IL-6、TNF-α等炎症因子水平均有不同程度增高(P<0.01)。经干预后,栀子苷组大鼠脂肪重量、肝湿重、肝指数、肝脏TG含量、血浆LPS水平、肝组织IL-1β、IL-6、TNF-α等炎症因子水平均较模型组有不同程度的下降(P<0.05,P<0.01)。结论栀子苷能明显改善大鼠肠黏膜组织结构,保持肠黏膜屏障的完整性,显著降低血浆LPS水平,显著降低NASH大鼠肝组织IL-1β、IL-6、TNF-α等炎症因子的表达。提示栀子苷治疗NASH的作用机制与调节肠肝轴、改善肠黏膜屏障、减少内源性LPS产生、降低炎症因子表达有关。国家自然科学基金资助项目(No.81673660)2017、2018厦门大学大学生创新创业训练课题(No.2017X0547; No.201810384230

基于肠肝轴研究栀子苷对非酒精性脂肪性肝炎大鼠的影响

目的 观察栀子苷对非酒精性脂肪性肝炎(non-alcoholic steatohepatitis,NASH)大鼠的影响,并基于肠肝轴探讨栀子苷防治NASH的作用机制。方法 将35只大鼠按随机数字表法分为5组,每组7只。即正常组、模型组、栀子苷组、盐酸吡格列酮组及培菲康组。除正常组外,其余28只大鼠采用高脂饮食16周建立大鼠NASH模型,在造模第9周开始给药,共治疗8周。第16周末经腹主动脉取血,生化法检测肝组织甘油三酯(TG)水平,苏木精-伊红(HE)染色观察肝组织、肠组织病理学变化。ELISA法检测肝组织白细胞介素(IL)-1β、IL-6、肿瘤坏死因子-α(TNF-α)等炎症因子的表达水平。终点显色法检测血浆内毒素(LPS)含量。结果与正常组比较,模型组大鼠的肝组织显示出典型的NASH组织学特征,经栀子苷干预后,肝细胞脂肪变性、炎症浸润较模型组减轻。与正常组比较,模型组大鼠肠上皮细胞少量脱落,肠黏膜机械屏障受损。经栀子苷干预后,回肠黏膜结构完整,未见明显肠上皮细胞脱落。与正常组比较,模型组大鼠脂肪重量、肝湿重、肝指数、肝脏TG含量、血浆LPS水平、肝组织IL-1β、IL-6、TNF-α等炎症因子水平均有不同程度增高(P<0.01)。经干预后,栀子苷组大鼠脂肪重量、肝湿重、肝指数、肝脏TG含量、血浆LPS水平、肝组织IL-1β、IL-6、TNF-α等炎症因子水平均较模型组有不同程度的下降(P<0.05,P<0. 01)。结论栀子苷能明显改善大鼠肠黏膜组织结构,保持肠黏膜屏障的完整性,显著降低血浆LPS水平,显著降低NASH大鼠肝组织IL-1β、IL-6、TNF-α等炎症因子的表达。提示栀子苷治疗NASH的作用机制与调节肠肝轴、改善肠黏膜屏障、减少内源性LPS产生、降低炎症因子表达有关

Recent Advances in Fluorophosphate and Orthosilicate Cathode Materials for Lithium Ion Batteries

Corresponding authors.SHI Zhi-Cong, Email: [email protected]; Tel: +86-411-39893938. YANG Yong, Email: [email protected]; Tel: +86-592-2185753.[中文文摘]综述了用于锂离子电池的氟磷酸盐和正硅酸盐正极材料的研究现状,重点对各种材料的结构及合成方法与性能的关系,特别是对如何改善材料的电化学性能进行了总结和探讨.展望了这两类锂离子电池正极材料的发展趋势.[英文文摘]We review recent research on fluorophosphate and orthosilicate cathode materials for lithium ion batteries.Emphasis is placed on the relationship between structures,methods of preparation and properties of the cathode materials.We especially focus on factors leading to an improvement in their electrochemical performance.Trends of research into fluorophosphate and orthosilicate cathode materials are also discussed.高等学校博士学科点专项科研基金(20090041120020); 中央高校基本科研业务费专项资金(DUT10JN06)资助项

Y型聚乙二醇干扰素琢-2b注射液治疗HCV基因2/3型慢性丙型肝炎患者疗效和安全性的多中心随机对照试验研究

目的以标准剂量的聚乙二醇干扰素(Peg IFN)α-2a联合利巴韦林作为阳性对照,评价新型试验药物Y型Peg IFNα-2b注射液联合利巴韦林治疗2型/3型慢性丙型肝炎(CHC)患者的疗效和安全性。方法采用多中心、随机开放、阳性药对照的Ⅲ期临床试验,筛选符合要求的2型/3型CHC患者,按照2:1的比例随机分配到Y型Peg IFNα-2b组和Peg IFNα-2a组,同时口服利巴韦林,疗程24 w,停药随访24 w。采用Abbott Real Time HCV Genotype II检测HCV基因型,采用Cobas Taq Man实时定量PCR法检测血清HCV RNA水平。详细记录不良事件。主要疗效指标为持续病毒学应答(SVR),并进行非劣效检验。结果本试验实际入组2型/3型CHC患者255例,实际治疗241例。全分析集(FAS)数据显示,158例试验组和83例对照组患者SVR分别为85.4%(95%CI 79.94%~90.94%)和79.5%(95%CI 70.84%~88.20%,P=0.2402);对符合方案分析集(PPS)人群分析显示,试验组和对照组患者SVR分别为87.9%(95%CI 82.45%~93.27%)和85.9%(95%CI 77.82%~94.01%,P=0.7060),率差的95%可置信区间均符合非劣效标准;对PPS人群分析显示,85.8%受试者获得了早期病毒学应答(RVR),RVR的阳性预测值为90.1%;试验组和对照组不良事件发生率相似,分别为95.6%和95.2%,严重不良事件发生率分别为3.8%和3.6%。结论应用Peg IFNα联合利巴韦林治疗2型/3型CHC患者,新型试验药物Y型Peg IFNα-2b具有与对照药物Peg IFNα-2a相似的疗效和安全性。国家科技部“十二五”重大专项(编号:2012ZX10002-003)；“重大新药创制”十二五科技重大专项(编号:2012ZX09303019)

Asymmetric Migration of Human Keratinocytes under Mechanical Stretch and Cocultured Fibroblasts in a Wound Repair Model

Keratinocyte migration during re-epithelization is crucial in wound healing under biochemical and biomechanical microenvironment. However, little is known about the underlying mechanisms whereby mechanical tension and cocultured fibroblasts or keratinocytes modulate the migration of keratinocytes or fibroblasts. Here we applied a tensile device together with a modified transwell assay to determine the lateral and transmembrane migration dynamics of human HaCaT keratinocytes or HF fibroblasts. A novel pattern of asymmetric migration was observed for keratinocytes when they were cocultured with non-contact fibroblasts, i.e., the accumulative distance of HaCaT cells was significantly higher when moving away from HF cells or migrating from down to up cross the membrane than that when moving close to HF cells or when migrating from up to down, whereas HF migration was symmetric. This asymmetric migration was mainly regulated by EGF derived from fibroblasts, but not transforming growth factor alpha or beta_1 production. Mechanical stretch subjected to fibroblasts fostered keratinocyte asymmetric migration by increasing EGF secretion, while no role of mechanical stretch was found for EGF secretion by keratinocytes. These results provided a new insight into understanding the regulating mechanisms of two or three-dimensional migration of keratinocytes or fibroblasts along or across dermis and epidermis under biomechanical microenvironment

聚能射流临界侵彻速度的实验研究

聚能射流侵彻不同强度钢靶板的过程中,临界侵彻速度u_j~*是一个重要的特征量,它反映靶板材料抗侵彻方面的性能。本文提出一个近似确定u_j~*的模拟实验方案,并且由此方案得出五种强度钢靶板的临界侵彻速度值

An Epidemiological Investigation on the Prevalence of Hepatitis E among Blood Donors

为了解献血员戊型肝炎感染情况,对2002年7～8月向北京市血液中心义务献血的所有人员进行整群抽样并抽血,应用ELISA检测戊型肝炎病毒(HEV)IgG的感染率。结果发现:北京献血员HEVIgG总感染率为26 59%,性别、年龄、省份分布存在着差别,男性比女性感染率高,年龄越大感染率越高,来自高感染省份者感染率也高,但ALT与HEVIgG感染无关。因此,男性、年龄大、来自高感染省份具有较高的HEV感染风险,进一步研究献血员的亚临床感染对HEV的输血安全性具有重要意义。In order to investigate the prevalence of HEV infection among blood donors,a cluster sampling strategy was used to sample all blood donors from July to August in 2002 in Beijing.Their blood were tested with HEV IgG ELISA.The total prevalence of HEV IgG among blood donors in Beijing was 26.59%,with statistically significant differences among sexes,ages and provinces.The prevalence was much higher in male andincreased along with their age,also high in persons coming from prevalent provinces.There exist high risks among these blood donors. Further studies aiming at sub-clinical HEV infection among blood donors will provide more meaningful data for blood transfusion safety