乙型肝炎病毒多聚酶末端蛋白重链可变区抗体体外抑制病毒的复制

目的用蛋白片段互补法(PCA)选择HBV多聚酶末端蛋白(TP)重链可变区(VH)抗体,研究特异性VH抗体体外抑制HBV的复制与分泌。方法以HBV多聚酶TP区为抗原,用PCA法进行特异性VH抗体筛选。特异性VH抗体基因定向亚克隆人真核表达载体pZeoSV2( ),构建pZeoSV2( )-VH重组质粒,用脂质体介导的转染技术,将其导入HepG 2.2.15细胞,观察特异性抗体的生物学活性。结果用PCA法从抗体库中选择出3个特异性抗体:VH1、VH2和VH3,其中与抗原亲和力最高的是VH1。转染pZeoSV2( )-VH1的HepG 2.2.15细胞比未转染pZeoSV2 ( )-VH1或只转染空载体pZeoSV2( )的HepG 2.2.15细胞病毒颗粒分泌明显减少,上清液内为2.978 7±0.276 1比5.150 4±0.276 1和5.295 1±0.241 0(P<0.05);细胞内为5.283 9±0.162 9比8.300 4±0.323 2和8.532 1±0.138 3(P<0.05)。结论用PCA法可从抗体库中选择出HBV多聚酶TP区特异性VH抗体,该抗体在体外可抑制HBV的复制与分泌。     

3种人血清白蛋白降解多肽片段的血液相容性研究

目的 研究3种人血清白蛋白降解多肽片段(PF1-123、PF124-298、PF299-585)的血液相容性.方法 分别考察3种多肽片段对新鲜人血的溶血率、对血细胞形态的影响、全血凝固时间以及血浆复钙时间,测试其血液相容性.结果 PF1-123、PF124-298和PF299-585对新鲜人血的溶血率分别为0.52％±0.47％、0.39％±0.33％、0.32％±0.23％,对血细胞形态均无不良影响,说明3种多肽片段均符合医用材料的溶血率要求;3种多肽片段的全血凝固时间曲线以及血浆复钙时间曲线与人血清白蛋白相似,说明其与血液接触后不会激活相关因子而促成凝血.结论 PF1-123、PF124-298和PF299-585具有良好的血液相容性.     

Clinical effects of antiplatelet drugs and statins on D‐dimer levels

Background

Acute pulmonary embolism may be ruled out by combining nonhigh clinical probability and a normal D‐dimer level. Both antiplatelet drugs and HMG‐CoA reductase inhibitors (statins) have been associated with effects on thrombus formation, potentially influencing D‐dimer levels in this setting, leading to a higher rate of false‐negative tests. Therefore, we determined whether D‐dimer levels in patients with suspected pulmonary embolism are affected by concomitant use of antiplatelet drugs and/or statins and evaluated whether the effect of antiplatelet drugs or statins might affect diagnostic accuracy.

Materials and methods

We performed a posthoc analysis in the YEARS diagnostic study, comparing age‐ and sex‐adjusted D‐dimer levels among users of antiplatelet drugs, statins and nonusers. We then reclassified patients within the YEARS algorithm by developing a model in which we adjusted D‐dimer cut‐offs for statin use and evaluated diagnostic accuracy.

Results

We included 156 statins users, 147 antiplatelet drugs users and 726 nonusers of either drugs, all with suspected pulmonary embolism . Use of antiplatelet drugs did not have a significant effect, whereas statin use was associated with 15% decrease in D‐dimer levels (95% CI, ?28% to ?0.6%). An algorithm with lower D‐dimer thresholds in statin users yielded lower specificity (0.42 compared to 0.33) with no difference in false‐negative tests.

Conclusions

We conclude that use of statins but not of antiplatelet agents is associated with a modest decrease in D‐dimer levels. Adjusting D‐dimer cut‐offs for statin use did, however, not result in a safer diagnostic strategy in our cohort.

     

冠心病病变范围与载脂蛋白E基因多态性及血脂分布的关系

目的 :探讨冠心病 (CHD)病变范围与载脂蛋白E(apoE)基因多态性及血脂分布的关系。 方法 :用酚氯仿抽提核酸法从凝血块中分离DNA ,用多聚酶链式反应 限制性片段长度多态性 (PCR RFLP)方法对新疆乌鲁木齐地区维、汉两民族人群中 10 2例CHD患者和 5 1例对照组人群进行apoE基因多态性 (由ε2、ε3和ε4决定的E2 / 2、E3/ 3、E4 / 4、E4 / 2、E4 / 3和E3/ 2 )HhaI酶切研究。结果 :①CHD组apoE之ε2 ,ε3和ε4等位基因频率分别为 0 .0 735± 0 .2 15 7,0 .774 5± 0 .3117和 0 .15 2 0± 0 .2 4 16 ,1支病变组apoE之ε2 ,ε3和ε4等位基因频率分别为 0 .10 6 1± 0 .2 4 2 3,0 .75 76± 0 .35 6 2和 0 .136 4± 0 .2 2 6 1,2支病变组apoE之ε2 ,ε3和ε4等位基因频率分别为 0 .0 5 5 6± 0 .1992 ,0 .80 5 6± 0 .2 995和 0 .1389± 0 .2 5 6 7,3支病变组apoE之ε2 ,ε3和ε4等位基因频率分别为 0 .0 6 0 6± 0 .2 0 76 ,0 .75 76± 0 .2 82 9和 0 .1818± 0 .2 4 4 3,与正常对照组 (0 .196 1± 0 .30 13,0 .6 6 6 7±0 .36 97和 0 .1373± 0 .2 2 5 4 )比较 ,ε2明显减低 (P <0 .0 5 ) ,病变范围越大 ,ε2越低 ,但病变范围大小之间统计学无差异 ,ε3和ε4随着病变范围增大逐渐升高但统计学无显著差别 (P >0     

Restriction fragment length polymorphism (RFLP) of the human insulin receptor gene in Japanese: its possible usefulness as a genetic marker

Summary Restriction fragment length polymorphism of the human insulin receptor gene was analyzed with a 4.2 Kb cDNA probe in Japanese normal subjects and Type 2 (nonsulin-dependent) diabetic patients. Restriction endonuclease Rsa I digestion showed polymorphism of the human insulin receptor gene, with a band at 6.7 Kb, 6.2 Kb or 3.6 Kb. The frequency of the 6.7 Kb band was less than that in Caucasians. the Japanese subjects examined lacked a 3.6 Kb band, which is commonly found in Caucasians. We have also detected restriction fragment length polymorphism in the human insulin receptor gene by Pvu II or Stu I digestion. Although no significant association of restriction fragment length polymorphism with Type 2 diabetes was found in the present study, our results suggest that the restriction fragment length polymorphism in the human insulin receptor gene varies among ethnic groups, and that the restriction fragment length polymorphism linked to the human insulin receptor gene might be a useful marker for the linkage study of the genes located close to the human insulin receptor gene on chromosome 19.     

我国部分地区蜱中莱姆病螺旋体的检测与基因分型研究

目的 对我国部分地区的多种蜱类进行莱姆病螺旋体的检测和基因分型。方法 选择我国黑龙江、吉林和浙江省部分林区为调查点，采集当地蜱类，用巢式PCR法进行检测，阳性产物进行限制性片段长度多态性（RFLP）分析和单链构象多态性（SSCP）分析，确定莱姆病螺旋体的基因型。结果 共检测蜱512只，阳性126只，阳性率24．61％。其中吉林全沟硬蜱带菌率为37．00％，黑龙江全沟硬蜱带菌率为20．87％，浙江长角血蜱带菌率为28．07％。RFLP分析表明，蜱中莱姆病螺旋体包括B．garinii和B．afzelii两种基因型。SSCP分析显示为7种亚型，其中B．garinii分为5个亚型，B．afzelii分为2个亚型。发现有3只蜱同时感染不同基因（亚）型莱姆病螺旋体。结论 证实B．garinii和B．afzelii基因型为我国莱姆病螺旋体的优势基因型，并在我国蜱中发现莱姆病螺旋体不同基因（亚）型的混合感染。     

Association of IL-8 gene polymorphisms with non small cell lung cancer in Tunisia: A case control study

Interleukin 8 (IL-8), is a proinflammatory chemokine, has been reported to have angiogenic activity and to be responsible for tumor-associated angiogenesis in several cancers. In this study, we aimed to study the (IL-8) gene polymorphism in relation with risk development of non small cell lung cancer in Tunisian patient. Two single nucleotide polymorphisms (−251T/A [rs4073], +781C/T [rs2227306]) of the IL-8 gene were screened in 170 patients with NSCLC and 225 healthy controls by PCR–RFLP.     

用分子生物学技术分析国内六株旋毛虫分离株

本文首次对来自我国不同地区、不同宿主来源有代表性的6个旋毛虫分离株从基因组DNA的限制性酸切长度多态性、同工酶及可溶性蛋白进行综合研究。核酸结果显示：长春株与其余各地域株的限制性酶切困话间存在着差异，用长春株特异性DNA片段（1．12kb）制成探针，与各株DNA进行Southern杂交，发现各虫株的杂交带型不一，且仅长春株出现1．12kb杂交带。同工酶结果显示：长春株与其余各珠在5种同工酶（GPI、G6PD、HK、6PGDH及AK）酶谱中有显著不同。等电聚焦电泳结果显示：长春株具有一条约4.1PI的特异带。上述结果提示：我国6株旋毛虫分离株间存在着差异，长春株与其余各株差异显著，从而推断我国旅毛虫虫株至少存在2种不同的生物学类型，其间的差异主要与不同的地理分布和／或不同宿主来源有关。     

A model for the role of HLA-DQ molecules in the pathogenesis of juvenile chronic arthritis

Summary Restriction fragment length polymorphism (RFLP) typing of MHC-class II loci DRB, DQA1, DQB1, DQA2 and DPB1 was performed in 94 patients with seronegative juvenile chronic arthritis (JCA) and 184 random controls. Analysis of allele frequencies and MHC-class II 4-loci haplotypes indicate: (1) Susceptibility to JCA is more strongly associated with the HLA-DQ subregion than with the HLA-DR subregion, especially in early onset pauciarticular JCA (EOPA-JCA). (2) Haplotype and sequence analysis show two independent MHC-class II associations for susceptibility to EOPA-JCA, one located in DQA1, the other in DPB1. (3) Two RFLP defined patterns of the DQA1 locus, DQA1.5 (DQA1^*0501) and DQA1.8 (DQA1^*0401, ^*0601) are strongly associated with the disease. (4) Analysis of amino-acid (AA) sequences coded in exon 2 of DQA1 reveals an AA sequence of six AAs common to all three associated DQA1 alleles. This suggests a model that includes a functional role for HLA-DQ molecules in the pathogenesis of JCA.Most of the data covered in this article are from the doctoral thesis of Haas [39]. Supported by SFB 217 To whom ffprint requests should be sent     

CYPl7、CYPlA2酶基因多态性与子宫内膜异位症的关系

目的探讨CYPl7 T-34C、CYPIA2 G-2964A基因多态性与子宫内膜异位症遗传易感性的关系。方法抽取108例确诊为子宫内膜异位症患者及84例对照组女性的静脉血,提取全基因组DNA,分别用聚合酶链式反应（PCR）技术扩增CYPl7 T-34C、CYPIA2 G-2964A多态位点的基因片段,并对其进行酶切,根据酶切结果计算出各等位基因的表型频率,用X2检验及OR值分析其多态性与子宫内膜异位症的关系。结果病例组和对照组CYPl7基因的基因型及等位基因的频率分布比较差异有统计学意义（P〈O.05）。病例组和对照组CYPIA2基因型、等位基因频率的比较差异无统计学意义（P〉0.05）。结论CYPl7 T-34C可能与III、IV期子宫内膜异位症发病风险相关。CYPlA2 G-2964A多态性可能不是子宫内膜异位症独立的危险因素。