15-HETE对肺动脉平滑肌细胞钙离子浓度的影响

目的 通过阻断细胞外钙离子 (Ca2+ )内流,观察 15 羟化二十烷四烯酸 ( 15 HETE)对兔肺动脉环收缩张力和肺动脉平滑肌细胞内游离钙浓度 ( [Ca2+ ]i)的影响,探讨缺氧时 15 HETE引起细胞钙动员的机制。方法 采用组织浴槽血管环方法观察L 型钙通道阻断剂硝苯地平和无钙液对15 HETE诱导的兔肺动脉环收缩力的影响;酶法分离培养兔肺动脉平滑肌细胞,激光扫描共聚焦显微镜测定 15 HETE对细胞内 [Ca2+ ]i的作用。结果 在正常组和缺氧组, 10μmol·L-1硝苯地平和无钙液对 1μmol·L-1 15 HETE引起的肺动脉环收缩均没有影响;培养的 15 HETE组细胞 (正常培养的细胞暴露于 1 μmol·L-1 15 HETE下继续孵育 8min)与正常对照组相比,细胞内 [Ca2+ ]i明显增加 (P<0 05)。结论 15 HETE可引起肺动脉平滑肌细胞 [Ca2+ ]i增加,且此钙来源于细胞内贮钙库的释放。

盐酸椒苯酮胺对豚鼠耳蜗缺血再灌注损伤后细胞凋亡的影响

目的：探讨盐酸椒苯酮胺（piperphentonamine hydrochloride，PPTA）对豚鼠耳蜗缺血再灌注损伤（ischemia-reperfusion injury，I/RI）后凋亡细胞的保护。方法将24只豚鼠随机分为正常组、假手术组、I/RI组、PPTA组4组，每组6只。采用TUNEL法观察耳蜗细胞凋亡情况，计算凋亡指数（apoptotic index，AI），组间比较检测结果。结果正常组、假手术组和PPTA组耳蜗没有或仅个别部位有凋亡细胞，I/RI组凋亡细胞明显多于其它3组。结论细胞凋亡是耳蜗I/RI的一种损伤形式，PPTA可能通过减少细胞凋亡对I/RI耳蜗起保护作用。

Protective effect and mechanism of lithium chloride pretreatment on myocardial ischemia-reperfusion injury in rats

Objective:To investigate the protective effect and mechanism of lithium chloride pretreatment on myocardial ischemia-reperfusion injury(I-RI)in rats.Methods:A total of 60 SD rats were randomly divided into control group,model group,lithium chloride intervention group and L-arginine methyl ester+lithium chloride intervention group with 15 in each.The I-RI model was established in model group,the Utliium chloride intervention group and L-arginine methyl ester+lithium chloride intervention group by method of seaming along left anterior descending coronary artery myocardial,control group was only opened the chest without seaming,STelevation within 2 min was regarded as modeling success.Model group did not adopted any intervention,lithium chloride intervention group was treated with lithium chloride injection15 mg/kg by jugular venipuncture preoperatively,L-arginine methyl ester+lithium chloride intervention group was treated with intraperitoneal injection of 30mg·kg～(-1)·d～(-1)(L—arginine methyl ester 7 d before the test,and intravenous catheter of 15 mg/kg lithium chloride preoperatively.The hydroxybulyric acid dehydrogenase(HBDH),creatine kinase isoenzyme(CK-MB),superoxide dismutase(SOD),malondialdehyde(MDA)level and nitric oxide synthase(NOS)activites were tested.Each large area of myocardial ischemia tissue was extracted for determination of the MDA content,SOD activity in tissue and serum,and morphological changes of myocardial tissue.Results:SOD activity was highest in lithium chloride intervention group,followed by L-arginine methyl ester+lithium chloride intervention group,control group and model group(P<0.05);SOD activity was highest in L-arginine methyl ester+lithium chloride intervention group intervention group,followed by lithium chloride intervention group,control group and model group(P<0.05).MDA content of myocardial tissue was highest in model group,followed by L-arginine methyl ester+lithium chloride intervention group,the lithium chloride intervention group and control group(P<0.05);serum MDA content was highest in L-arginine methyl ester+lithium chloride intervention group,followed by model group,lithium chloride intervention group and control group(P<0.05).Compared with the control group,serum NOS was significantly higher in model group,lithium chloride intervention group and L-arginine methyl ester+lithium chloride intervention group(P<0.05),there was no statistical difference of serum NOS activity between the three groups(P>0.05);HBDH and CK-MB of plasma were highest in model group,followed by L-arginine methyl ester+lithium chloride intervention group,lithium chloride intervention group and control group(P<0.05).A significantly lighter myocardial damage was observed microscopically in lithium chloride intervention group than that in L-arginine methyl ester+lithium chloride intervention group and model group.Conclusions:lithium chloride pretreatment can significandy reduce the myocardial I-RI,maintain structure and function of myocardial cells,improve the antioxidant ability of myocardial tissue,play an effective role on protecting myocardial I-RI.

TGFβ_1及其受体TGFβ RI在唾液腺腺样囊腺癌组织中的表达

目的 :研究TGFβ1 及其TGFβRI在唾液腺腺样囊腺癌中的作用。方法 :应用免疫组化SP法检测唾液腺腺样囊腺癌中TGFβ1 和TGFβRI的蛋白表达 ,并与正常唾液腺及唾液腺多形性腺瘤作定量比较。结果 :①TGFβ1 和TGFβRI蛋白在正常唾液腺组织中主要表达于各级导管上皮细胞和肌上皮细胞中 ,腺泡细胞无表达 ;②TGFβ1和TGFβRI蛋白在唾液腺多形性腺瘤组织中主要表达于呈腺管状、条索状及团块状排列的肿瘤上皮细胞中 ,其表达水平与正常唾液腺差异无显著性 (P >0 .0 5 ) ;③唾液腺腺样囊腺癌组织中TGFβ1 蛋白表达水平显著增高 (P <0 .0 1) ;TGFβRI蛋白表达水平显著降低 (P <0 .0 1)。结论 :TGFβRI蛋白的低表达在唾液腺腺样囊腺癌的发生发展中起重要作用 ,腺样囊腺癌独特的不良生物学行为可能与TGFβ1 蛋白的过度表达以及TGFβRI蛋白的低表达有关。

ATP敏感性钾通道在降钙素基因相关肽心肌保护中作用的研究进展

降钙素基因相关肽(calcitonin gene-relatedpe ptide,CGRP)是一种可强烈舒张血管的感觉神经肽,具有减轻心肌缺血/再灌注损伤(myocardial ischemia/reperfusion injury,MI/RI)的作用,但其具体机制仍不清楚。心肌三磷酸腺苷(ATP)敏感性钾通道(KATP)具有联系细胞新陈代谢与细胞膜的兴奋性的作用,涉及对心率失常及心衰的保护。而KATP可能是CGRP减轻MI/RI作用通路中的关键节点。该文就KATP在CGRP心肌保护中的作用作一综述,阐述CGRP减轻MI/RI的作用机制。

半群上的富足Rees矩阵半群

引入半群上的λ-行L*-关系和i-列R*-关系,讨论了半群上的这类*-关系和通常的Green′s关系中L*和R*之间的联系,得到了一系列判断半群上的Rees矩阵半群是否为富足半群或是哪一类具有充足断面的富足半群的方法,并给出了这类富足Rees矩阵半群的例子及其结构.

舒芬太尼后处理对大鼠心肌缺血再灌注中IL-6、IL-10的影响

目的通过观察舒芬太尼后处理对大鼠心肌缺血再灌注中IL-6、IL-10的影响,探讨舒芬太尼后处理对心肌的保护作用。方法 40只Wistar大鼠随即分为假手术组(A组):只穿线,不结扎;缺血再灌注组(B组):缺血30min后,再灌注120min;缺血后处理组(C组):缺血30min末行缺血30s,再灌注30s,重复3次,再灌注120min;舒芬太尼后处理组(D组):缺血30min再灌注前5min静脉滴注舒芬太尼0.1μg/kg,再灌注120min。结扎大鼠心脏冠状动脉左前降支制备心肌缺血再灌注损伤模型,用ELISA方法观察各组在各采血时间点血清中IL-6、IL-10的含量,并计算心肌梗死面积。结果与假手术组相比,缺血再灌注组IL-6、IL-10含量均增高;与缺血再灌注组相比,缺血后处理组IL-6含量降低,IL-10含量增高;与缺血后处理组相比,舒芬太尼后处理组IL-6含量降低,IL-10含量增高,且4组含量数据差异均有统计学意义(P<0.05)。结论舒芬太尼后处理对大鼠心肌缺血再灌注具有保护作用,舒芬太尼后处理可能通过调控对大鼠心肌缺血再灌注血清中的IL-6、IL-10含量来发挥对心肌细胞的保护作用。

基于启动者策略的改进型负载调度方法

针对目前分布式系统中负载均衡策略普遍存在效率低,准确度不高等问题,提出了一种SI策略的最佳条件匹配和递增式任务量转移方法,并优化了RI策略的检索方式,加快了负载转移速度,提高了目标节点选择和转移任务量的准确性。在此基础上给出了两种策略动态切换的一般方法。实验结果表明,该方法能够避免负载处理的不均衡,有效地提高了系统的整体处理能力。

电磁干扰造成PLC总线通信报错的实例分析

论述了安徽平圩电厂可编程控制器总线系统通信异常报错的现象,通过硬件及软件检测分析,确定了通信报错的原因是电磁干扰。分析了产生电磁干扰的原因,给出了具体的解决方法,供处理类似问题时参考。

The interleukin-1 receptor antagonist (IL-1-Ra) and soluble tumor necrosis factor receptor I (sTNF RI) in periodontal disease

The course and severity of periodontitis can be significantly affected by bacterial virulence as well as host immunity dysfunction. Periodontal tissue destruction has been proved to result from cascade of cytokines synthesized by reactive cells upon stimulation by pathogenic bacteria and lipopolysaccharides within their cell membranes. The clinical use of genetically programmed cells, producing substances blocking IL-1, based on recombinant IL-1 antagonist, as well as cytokines activating fibroblasts and osteoblasts to regenerate the destroyed periodontal tissue could prove alternative to the conventional treatment. Another cytokine of interest in respect to periodontitis ethiopathogenesis is soluble tumor necrosis factor receptor I (sTNF RI). Observation of soluble TNF receptors as physiologic inhibitors of TNF led to its administration in therapeutic process as well as in therapy selected cases of aggressive periodontitis.

前列地尔与贝那普利联合治疗糖尿病肾病蛋白尿的临床研究

目的探讨前列地尔与贝那普利联合治疗糖尿病肾病蛋白尿的效果。方法选取2015年3月—2017年3月该院收治的糖尿病肾病蛋白尿患者130例,随机分为2组各65例,观察组给予前列地尔联合贝那普利,对照组给予贝那普利,比较疗效。结果观察组总有效率为86.2%,明显优于对照组73.8%(P<0.05);治疗后观察组24 h尿蛋白定量(153.8±10.4)mg/24 h、24 h尿微量白蛋白排泄率(2.35±0.33)mg/mol.Cr下降显著优于对照组(P<0.05)。结论糖尿病肾病蛋白尿患者运用前列地尔与贝那普利联合治疗,能有效降低蛋白尿水平,改善肾功能,疗效显著。

元明汉藏艺术交融的视觉证据——西藏阿里三围地区的汉式龙凤艺术遗珍

本文首次对西藏传统阿里三围地区十余处遗存中现存的大量汉式龙凤纹样进行梳理和归纳,并对其渊源、背景、传播途径和本土化特征加以分析。元明时期的龙凤纹样主要分布在古格王国中心地区的寺院和石窟,拉达克和贡塘王国也有少量遗存。涉及的艺术种类主要为壁画、建筑彩绘、经书插图、泥塑、擦擦和丝织品,其造型和样式组合丰富,体现出本土化特征。作者通过文本和风格比较发现,这些龙凤纹样大都源于内地,主要通过朝贡赏赐等途径传入西藏和阿里,是元代统一西藏后西藏地方与中央政府在政治、经济和文化等领域大规模频繁交往、交流和交融的视觉证据。