用套式RT-PCR法检测肝细胞癌中丙型肝炎病毒基因型

目的　检测人肝细胞癌（ＨＣＣ）组织中丙型肝炎病毒（ＨＣＶ）基因型。方法　用ＲＴＰＣＲ法常规检测ＨＣＣ组织和部分患者血清ＨＣＶ,再以巢式ＲＴＰＣＲ法对ＨＣＶ阳性标本中５种ＨＣＶ基因型进行鉴别。对多数标本中ＨＢｓＡｇ和ＨＢＶＤＮＡ也进行了免疫组化和原位杂交检测。结果　ＨＣＣ组织中ＨＣＶ阳性率为５０％（３９／７８）,与ＨＢＶ者（６４．４％）差异无显著性意义（Ｐ＞０．０５）,两者重叠感染率３４％（２０／５９）。在１０例血清ＨＣＶ阴性ＨＣＣ患者中,３例ＨＣＣ冰冻组织检出ＨＣＶＲＮＡ。在ＨＣＣ组织中共检出３种ＨＣＶ基因型,其中２ａ、１ｂ、３ａ和混合型分别为１７例（４３．６％）、９例（２３．１％）、４例（１０．３％）和２例（５．１％）,各基因型间差异有极显著性意义（Ｐ＜０．０１）,但２ａ型与１ｂ型间差异无显著性（Ｐ＞０．０５）,２ａ型与ＨＢＶ的重叠感染明显较其他ＨＣＶ基因型者常见（Ｐ＜０．０５）。结论　２ａ型ＨＣＶ是ＨＣＣ组织中最常见的基因型并易与ＨＢＶ重叠感染率,ＨＣＣ患者血清ＨＣＶ检测不一定能准确反映ＨＣＣ组织中的ＨＣＶ感染率,其所示基因型也有所不同。     

心脑通对大鼠凝血功能的影响

目的　观察心脑通对大鼠凝血功能的影响。方法　心脑通给大鼠连续灌胃８ｄ 后,观察其对大鼠的出血时间、凝血酶时间、凝血酶原时间、部分凝血活酶时间、血小板聚集以及血浆中ＴＸＢ２ 与６ － 酮－ ＰＧＦ１α含量的影响。结果　心脑通０．４ｇ／ｋｇ、０．６ｇ／ｋｇ、０ ．８ｇ／ｋｇ 剂量组的出血时间、凝血酶时间、凝血酶原时间、部分凝血活酶时间均较生理盐水组明显延长（ Ｐ＜ ０．０５） ;且对ＡＤＰ诱导的血小板聚集有明显抑制作用;血浆中ＴＸＢ２ 与生理盐水组相比含量下降。结论　心脑通有良好的活血化瘀作用。     

酵母重组乙型肝炎疫苗在中小学生中接种效果评价

目的 评价中小学生大规模乙型肝炎疫苗接种效果。方法 随机选取来实行乙型肝炎疫苗计划免疫管理的6－18岁中小学生1829名,采用血清流行病学方法观测大规模酵母重组乙型肝炎疫苗接种效果。结果 对HBsAg、抗－HBs和抗－HBc全阴性者,接种疫苗1年后,抗－HBs阳性率为70．55％,HBsAg和抗-HBc阳性率分别为0．56％和1．96％;该人群接种前HBVM阳性率为63．31％,接种后为85．51％,抗－HBs阳性率显著增高,且以6－12岁低年龄组人群更明显,而HBsAg和抗－HBc阳性率在接种后1年无明显变化。结论 酵母重组乙型肝炎疫苗大规模接种后,在中小学生中形成了乙型肝炎高保护性、低感染状态。     

乙型肝炎患者血清可溶性Fas和可溶性Fas配体水平的研究

目的 研究可溶性Ｆａｓ（ｓＦａｓ）和可溶怀Ｆａｓ配体（ｓＦａｓＬ）在乙型肝炎发病中的意义。方法 用ＥＬＩＳＡ双抗体夹心法检测３９例各种类型地乙型肝炎患者血清ｓＦａｓ和ｓＦａｓＬ含量及其与病变的关系。并以８例健康献血员血清作对照。结果 慢性肝炎（中～重型）血清中ｓＦａｓ含量较高,与其它各组比较有显著性差异（Ｐ〈０．０１）;重型肝炎血清中ｓＦａｓＬ含量较高,与其它各组比较亦有显著性差异（Ｐ〈０．０１）     

共刺激分子CD28和B7在关节炎发病中的作用

目的：探讨Ｂ７;ＣＤ２８共刺激信号在关节炎发病机制中的作用。方法：经牛Ⅱ型的（ＢⅡＣ）诱导ＳＤ大鼠建立关节炎动物模型,分析抗Ｂ７－１和抗Ｂ７－２抗体对关节炎大鼠临床症状和特异性免疫反应的影响。结果：抗Ｂ７－１抗体可阻止ＳＤ大鼠发生胶原诱地性关节炎,降低大鼠对ＢⅡＣ的体液免疫反应。结论：Ｂ７;ＣＤ２８共刺激信号在诱发Ｔ细胞介导的自身免疫疾病中起作用,抗Ｂ７－１抗体具有潜在的治疗作用。     

Detection of hepatitis B virus polymerase variations resistant to lamivudine therapy

Objective To investigate variations in hepatitis B virus (HBV) polymerase gene in chronic HBV infected patients resistant to lamivudine therapy. Methods Specimens were obtained from nine patients with chronic HBV infection, who were resistant to lamivudine therapy. Partial segments of the HBV DNA polymerase gene we re amplified by polymerase chain reaction (PCR). Nucleotide sequence was performed using an applied 373 automated sequencer. Titre of HBV DNA was measured by branched DNA assay (Chiron). Results Of nine patients with HBV DNA positive after 64 weeks of treatment, five (56%) had variations in the highly conserved YMDD motif in domain C of the HBV polymerase, three of those were substitutions of isoleucine for methionine(M), and two were substitutions of valine(V) for methionine. Additionally, in two patients with variations characterized by substitutions of V for M, one had a simultaneous amino acid change from the first aspartic acid to glycine and this pattern of variation was not reported in other literatures. With respect to viremia, in two subjects with low titre of HBV DNA (<100 MEq/ml), no variation was found in the YMDD motif, whereas in seven patients with high titre of HBV DBA (>300 MEq/ml), five (71%) had variations in the YMDD motif. Conclusions Lamivudine is a potent anti-viral agent for treatment of chronic HBV infection. Resistance to lamivudine is likely caused by the variations in the YMDD motif of the HBV polymerase gene.     

EB病毒转化的丙型肝炎病人外周血B淋巴细胞中丙型肝炎Ⅱ型？…

目的 观察丙型肝炎病人外周血Ｂ细胞长期存活状态下其中是否仍有丙型肝炎病毒（ＨＣＶ）存在。方法 用ＥＢ病毒感染并使ＨＣＶ阳性外周血Ｂ细胞转化,获得含ＨＣＶ的外周血永生化Ｂ细胞（ＬＣＬ）。而后,每月应用套式ＲＴ－ＰＣＲ检测一次培养细胞和上清中的ＨＣＶ－ＲＮＡ,并用酶切法进行ＨＣＶ基因分型,电镜和免疫电镜观察ＨＣＶ在该细胞中存在的部位及其形态结构特征。结果 经连续１年检测,ＨＣＶ在传代细胞中持续存在,培     

Bacterially produced human B7-1 protein encompassing its complete extracellular domain maintains its costimulatory activity in vitro

Ｏｂｊｅｃｔｉｖｅ　Ｔｏｉｎｖｅｓｔｉｇａｔｅｗｈｉｃｈｏｆｔｈｅｔｗｏｉｍｍｕｎｏｇｌｏｂｕｌｉｎ (Ｉｇ ) ｌｉｋｅｄｏｍａｉｎｓ ,ｉｍｍｕｎｏｇｌｏｂｕｌｉｎｖａｒｉａｂｌｅｒｅｇｉｏｎｈｏｍｏｌｏｇｏｕｓｄｏｍａｉｎＩｇＶ (ｈＢ7 1ＩｇＶ) ,ｏｒｉｍｍｕｎｏｇｌｏｂｕｌｉｎｃｏｎｓｔａｎｔｒｅｇｉｏｎｈｏｍｏｌｏｇｏｕｓｄｏｍａｉｎＩｇＣ (ｈＢ7 1ＩｇＣ)ｏｎｈｕｍａｎＢ7 1ｍｏｌｅｃｕｌｅｃｏｎｔａｉｎｔｈｅｒｅｃｅｐｔｏｒｂｉｎｄｉｎｇｓｉｔｅｓ ,ａｎｄｔｏｅｖａｌｕａｔｅｉｆｔｈｅＢ7 1ｍ…     

Expression of the human multidrug resistance gene mdr1 in leukemic cells and its application in studying P-glycoprotein antagonists

Objective To explore the role of endothelin (ET) in the pathogenesis of exercise-induced asthma (EIA), we investigated the effects of ET(B) receptor antagonists, ET-1 (11-21)fragment and N-cis-2,6-dimethylpi-peridinocardonyl-L-γ-methylleucyl-D-1-methoxycarbonyl tryptophanyl-D-norleucine (BQ788) on broncho-constriction elicited by isocapnic hyperpnea in guinea pigs. Methods Eighteen pathogen-free Hartley guinea pigs were randomly divided into three groups. A: normal saline (NS) inhalation control group (n=6), B: BQ788 group (n=6), and C: ET-1(11-21) fragment group (n=6). Guinea pigs were anesthetized with pentobarbital sodium. After measuring the basal value of lung resistance (R[L]) and dynamic compliance of the respiratory system (Cdyn), NS (0.96 ml), BQ788 (9 nmol) and ET-1(11-21)fragment (9 nmol) were inhaled. A rodent respirator with a dry 5%CO(2)-95%O(2) mixture at room temperature provided mechanical ventilation (V[T] 8 ml/animal, 100 breaths/min) for 5 min. R[L] and Cdyn of the 3 groups were measured again after isocapnic hyperpnea challenge. Results In the control group, isocapnic hyperpnea of dry gas elicited a marked increase in R[L] and decrease in Cdyn. R[L] and Cdyn of the guinea pigs from BQ788 group and ET-1(11-21)fragment group did not change significantly. Conclusion It was demonstrated that selective ET(B) receptor antagonists, ET-1(11-21) fragment and BQ788, inhibited the bronchoconstriction induced by isocapnic hyperpnea in guinea pigs. The data showed that ETs are potent constrictors of guinea pig airway smooth muscle via a direct effect on ET receptors. It was suggested that ET receptor antagonists, especially ET(B) receptor antagonist, might be beneficial in preventing EIA.     

联合抗过敏疗法对急性乙型肝炎病人的疗效观察

[目的 ]阐明Ⅰ型变态反应与急性乙型肝炎关系 .[方法 ]将 42例急性乙型肝炎病人随机分为治疗组和对照组 ,并观察了联合抗过敏疗法对急性乙型肝炎的疗效 .[结果 ]治疗组行联合抗过敏疗法后血清内谷丙转氨酶和总胆红素均比治疗前明显降低 ,而对照组治疗前后无明显变化 ;治疗组谷丙转氨酶及总胆红素复常天数明显短于对照组 .[结论 ]联合抗过敏疗法对急性乙型肝炎疗效显著 ,从而间接证明了免疫球蛋白E及其介导的Ⅰ型变态反应在急性乙型肝炎发病机理中的致病作用 .