腘窝淋巴结免疫细胞多种表面分子在PLNA评价致敏性中的综合分析

目的利用腘窝淋巴结实验(popliteal lymph node as-say,PLNA)分析腘窝淋巴结免疫细胞多个表面分子在PLNA评价致敏性中的综合变化,旨在提高PLNA的可靠性和灵敏性。方法选用♀BALB/c小鼠,选取具有致敏潜能物质氯化汞(HgCl2)、链脲佐菌素(STZ)、2,4,6-三硝基苯磺酸(TN-BS)和D-青霉胺(D-pen)为供试品,后肢足趾部注射免疫动物1次,5 d后处死动物,取注射侧腘窝淋巴结制备细胞悬液,流式细胞术检测腘窝淋巴结淋巴细胞、效应T细胞、抗原提呈细胞及其MHCⅡ、协同刺激和早期活化等十余种表面分子的变化,探讨这些表面分子在供试品致敏后的综合改变。结果 HgCl2和TNBS引起腘窝免疫细胞多种表面分子明显变化,D-pen和STZ所致的相应变化不明显。结论腘窝淋巴结免疫细胞表面分子变化的综合分析可以判断供试品的致敏潜能;不同供试品引起表面分子变化的种类和强弱有所不同,在致敏性评价中应综合考察各细胞表面分子的变化。     

香菇多糖对免疫抑制小鼠肠道派氏结T细胞的影响

目的研究香菇多糖对环磷酰胺免疫抑制小鼠的肠道派氏结T细胞的影响。方法通过胸腺指数,脾脏淋巴细胞的增殖转化和迟发型超敏反应情况观察香菇多糖对免疫抑制小鼠系统免疫功能的影响;在迟发型超敏反应条件下,通过肠道派氏结T细胞比例、亚群和活化的情况观察香菇多糖对免疫抑制小鼠肠道派氏结T细胞的影响。结果香菇多糖对环磷酰胺诱导的小鼠胸腺指数降低,脾淋巴细胞增殖和迟发型超敏反应能力下降表现出明显的恢复作用;对环磷酰胺诱导的DTH小鼠小肠派氏结数目减少,派氏结中T淋巴细胞比例升高、活化水平降低等肠道黏膜免疫系统抑制状态同样具有明显改善作用。结论香菇多糖可以正向调节免疫抑制小鼠肠道派氏结的T细胞功能,提示香菇多糖对肠道黏膜免疫系统具有一定的免疫调节作用。     

5-氟尿嘧啶-N-琥珀酰壳聚糖纳米粒在荷瘤小鼠体内组织分布分析方法

目的:建立5-氟尿嘧啶-N-琥珀酰壳聚糖纳米粒(5-FU-Suc-Chi/NPs)在荷瘤小鼠血浆和组织中高效液相色谱(HPLC)分析方法。方法:生物样品经甲醇沉淀蛋白质并提取药物,采用HPLC法测定药物含量。色谱柱:Hypersil ODS C18(4.6mm×200mm,5μm);流动相:水-甲醇(99∶1)以磷酸调pH值6.2;流速:0.8mL.min-1;紫外检测波长:266nm;柱温:室温;进样量:20μL;内标:利巴韦林。结果:该方法线性范围为0.1~10mg.L-1,线性关系良好(r2=0.993 2~0.997 9),方法回收率、日内和日间精密度的RSD均小于15%。结论:该分析方法灵敏性、准确性较高,适用于5-FU-Suc-Chi/NPs荷瘤小鼠肿瘤靶向性及药动学研究。     

Assessment of the Chinese-version SF-36 in the Chinese opiate addicts

This study was designed to assess the reliability and validity of the Chinese version of the Medical Outcomes Study Short Form 36 (SF-36) assessed with opiate addicts in China. The sample was composed of 442 questionnaires from three regions in China, in 2004. The reliability of Chinese-version SF-36 was obtained using Cronbach's α and split-half coefficients and the validity was calculated using correlation analysis and confirmatory factor analysis method. The results of reliability and validity provide the first evidence that Chinese-version SF-36 is validated for Chinese addicts. The study's limitations are noted.     

Antiproliferative and antimetastatic effects of emodin on human pancreatic cancer

Emodin (1, 3, 8-trihydroxy-6-methylanthraquinone) is an active constituent isolated from the root of Rheum palmatum L and is the main effective component of some Chinese herbs and plants. Pharmacological studies have demonstrated that emodin exhibits anti-cancer effects on several human cancers. However, the molecular mechanisms of emodin-mediated tumor regression have not been fully defined. This study was performed to investigate the antiproliferative and antimetastatic effects of emodin on pancreatic cancer in vitro and in vivo. Our results showed that emodin induced a higher percentage of growth inhibition and apoptosis in the pancreatic cancer cell line SW1990 compared to that of control, and emodin suppressed the migration and invasion of SW1990 cells in a dose-dependent manner. To investigate the possible mechanisms involved in these events, we performed electrophoretic mobility shift assay (EMSA) and Western blot analysis, and found that emodin significantly down-regulated NF-κB DNA-binding activity, survivin and MMP-9 in SW1990 cells. Moreover, the expression of cleaved caspase-3 was up-regulated in SW1990 cells after treatment with emodin. In addition, a metastatic model simulating human pancreatic cancer was established by orthotopic implantation of histologically intact human tumor tissue into the pancreatic wall of nude mice. Oral administration of emodin significantly decreased tumor weight and metastasis compared to control. Furthermore, the expression of NF-κB, survivin and MMP-9 were also suppressed in tumor tissues after treatment with emodin. Collectively, our results indicated that emodin exerts antiproliferative and antimetastatic activity on pancreatic cancer both in?vitro and in?vivo, which may be related to down-regulation of NF-κB and its regulated molecules such as survivin and MMP-9 proteins. Consequently, these results provide important insights into emodin as an anti-invasive agent for the therapy of human pancreatic cancer.     

新型医用钛合金生物相容性评价

目的:评价新型医用钛合金Ti12.5Zr2.5Nb2.5Ta (TZNT)的生物相容性,并和3 种标准医用钛材料Ti6Al4V、Ti6Al7Nb和TA2进行对比.方法:通过细胞毒性试验观察细胞在TZNT、Ti6Al4V和Ti6Al7Nb合金离子析出培养液中的生长情况,计算在不同时间组的相对细胞增殖率,评价其毒性等级;通过皮下埋植试验观察4 种材料植入白鼠体内4 周和8 周的组织变化情况,计算炎细胞密度和纤维膜厚度的变化情况,评价其引起的组织反应程度.结果:TZNT、Ti6Al4V和Ti6Al7Nb在3 个时间组(2、 4、 6 d)的相对细胞增殖率均不低于100%,细胞毒性等级评定为0 级.和Ti6Al4V和Ti6Al7Nb相比,TZNT和TA2植入白鼠体内4 周和8 周后,无论是炎细胞密度还是植入物周围的纤维膜厚度均有所降低,引起的组织反应程度较低.结论:TZNT具有良好的生物相容性,是一种理想的生物医用钛合金.     

金-瓷结合界面与瓷-瓷结合界面的元素扩散

目的:比较研究金-瓷、瓷-瓷2种结合界面微观形貌以及结合机制.方法:制作15 mm×5 mm× 1 mm金-瓷与瓷-瓷双层结构试样各1个,将以上2试样均从中一分为二,自凝塑料包埋,断面经高度打磨抛光并表面喷金,做扫描电子显微镜和能谱分析.结果:扫描电镜发现瓷-瓷界面较金-瓷界面结合更加紧密,无明显间隙.能谱分析显示金-瓷结合界面发生Cr、O、Si元素的扩散,瓷-瓷界面发生Si、Al、K元素的扩散.结论:金-瓷界面与瓷-瓷界面均能达到化学结合,瓷-瓷界面较金-瓷界面结合更紧密.     

复合型先天性心脏病的介入治疗

目的研究复合型先天性心脏病经导管介入治疗策略并评价其疗效。方法共6例适合经导管介入治疗的复合型先天性心脏病,复合类型为：房间隔缺损（ASD）伴动脉导管未闭（PDA）5例,VSD伴PDA1例。经导管介入治疗原则为：先行PDA封堵,再行ASD或VSD封堵。术后第1个月、3个月、6个月、1年分别行经胸超声心动图、X线及心电图检查,以后每年定期随访。结果6例复合型先天性心脏病经导管介入治疗均获成功。术后即刻均无残余分流,无任何并发症发生。结论复合型先天性心脏病经导管介入治疗较单纯型复杂,但如指征掌握恰当,治疗策略合理,操作规范,同样可获良好的治疗效果。