Ku70对HTLV-1阳性T细胞中HTLV-1病毒蛋白表达的影响

目的:探讨Ku70对人嗜T淋巴细胞病毒1(HTLV-1)阳性T细胞中HTLV-1病毒蛋白表达的影响。方法:Western blot实验检测不同的HTLV-1阳性T细胞系中Ku70的表达水平;构建Ku70基因沉默siRNA并通过Western blot实验检测其敲减Ku70表达的效率;采用siRNA在HTLV-1阳性的T细胞中敲减Ku70表达后,通过real-time PCR和Western blot实验分别检测HTLV-1病毒蛋白在mRNA和蛋白水平上的表达量,并通过real-time PCR实验检测干扰素和促炎因子的表达量。结果:HTLV-1阳性T细胞系MT2、MT4及C8166中的Ku70均呈高表达;采用siRNA敲减Ku70的表达后,MT2细胞及MT4细胞中的HTLV-1病毒蛋白表达量上升;采用siRNA敲减Ku70的表达后,MT2细胞及MT4细胞中干扰素α、干扰素γ及肿瘤坏死因子α的表达下降。结论:Ku70在HTLV-1阳性T细胞中高表达;在HTLV-1阳性T细胞中,Ku70促进干扰素和促炎因子的表达,抑制HTLV-1病毒蛋白的表达。     

人类白血病病毒Ⅰ型致成人T细胞白血病/淋巴瘤的研究进展

现已证实人类白血病病毒Ⅰ型（human T-cell leukemia virus Type-1,HTLV-Ⅰ）为成人T细胞白血病/淋巴瘤（adult T-cell leukemia/lymphoma,ATLL）的致病病原,在过去的几年中,人们对该肿瘤进行了大量的研究工作并且发现了一些分子遗传学改变,包括结构基因gag,pol,pro和env,调节基因tax和rex以及最近在pX区域的负股发现的hbz基因和Fra-2等。随着人们对成人T细胞白血病/淋巴瘤相关基因功能的不断探索,该肿瘤的发病机制会更加明确,其临床治疗也会得到进一步的改善。本文对HTLV-Ⅰ及成人T细胞白血病/淋巴瘤近年来的分子遗传学研究结果、临床特征、分子机制及遗传倾向的关系作一介绍。     

中国人类嗜T细胞病毒Ⅰ型汕头株前病毒核苷酸序列分析

目的了解中国人类嗜T细胞病毒Ⅰ型(HTLV-Ⅰ)的基因特点,寻找其传播及流行的原因,为进行 HTLV-Ⅰ诊断试剂及疫苗的研制等提供基础资料. 方法设计22条引物,用PCR扩增出中国HTLV-I汕头株(命名为HTLV-ⅠWHP)的前病毒基因进行测序、分析. 结果获得HTLV-ⅠWHP前病毒的核苷酸全序列,共9?034bp.将HTLV-ⅠWHP与HTLV-Ⅰ的原型ATK进行比较,其LTR、gag、pol、env、tax、rex区的核苷酸变异率分别为:2.4%、1.2%、1.1%、2.0%、0.19%、0.79%.进化树的分析结果表明,HTLV-ⅠWHP与来自日本、加勒比海、台湾以及金门岛的部分毒株最接近,同属于世界群a 亚型. 结论 HTLV-ⅠWHP基因结构保守,来自于亚洲东北部沿海地区的HTLV-Ⅰ毒株可能具有共同的起源.     

HTLV-1 Tax 蛋白对T细胞中HMGB1调控的影响

目的探讨人T淋巴细胞白血病1型病毒（human T-cell leukemia virus 1,HTLV-1）Tax蛋白对人高迁移率族蛋白1（ high mobility group box 1,HMGB1）基因转录调控的影响。方法提取TaxN和TaxP细胞总RNA和蛋白质,通过real-time PCR和Western blot分析HMGB1 mRNA和蛋白质的表达情况;利用脂质体介导方法,将6个含有不同长度HMGB1调控序列的pGL3-HMGB1-luc瞬时转染至TaxN 和 TaxP 细胞,观察 HMGB1基因在不同 T 细胞中的转录活性;pCMV-Tax 与 pGL3-HMGB1-luc瞬时共转染至Jurkat细胞,观察Tax蛋白对HMGB1基因的转录调控影响;染色体免疫共沉淀（ ChIP）找寻Tax蛋白影响HMGB1基因转录调控的区段。结果 TaxP细胞中HMGB1 mRNA和蛋白质表达水平高于TaxN细胞。 TaxN和TaxP细胞中HMGB1调控趋势基本相似,均表现出3号质粒（pHLuc3,含有-504～＋83 HMGB1区段）的相对荧光素酶活性（HMGB1/neo）最高,但是6号质粒（含有-1163～＋83 HMGB1区段）却表现出 TaxP 细胞 HMGB1的转录活性明显高于 TaxN 细胞。pCMV-Tax与pGL3-HMGB1-Luc报告基因共转染到Jurkat细胞也显示,6号质粒（pHLuc6）中Tax促进HMGB1基因的转录。 ChIP分析证实了Tax蛋白可能富集在HMGB1的-1163～-1043区段。结论-504～-383可能是HMGB1基因转录激活的关键启动子区,Tax蛋白可能富集在HMGB1的-1163～-1043区段促进HMGB1基因转录。     

重组痘苗病毒诱导小鼠产生IgG抗体的动态观察

检测血清中HIV抗原或其相应的抗体是判断HIV感染的间接指标。HIV感染后 ,随着血清的阳转 ,首先出现抗HIV 1gag抗体 ,然后才是抗HIV 1env蛋白及其它蛋白的抗体 ,根据病程的进展HIV 1gag大量产生 ,HIV 1gag抗体被结合 ,抗体滴度逐渐下降。因此 ,血清中gag抗体和抗env编码蛋白的抗体检测仍然是目前最常用的诊断HIV感染的标志 ,它比单纯的CD4 + 细胞计数可提前 3～ 4年预测AIDS的发生。它不仅对HIV感染的诊断 ,而且对病情的发展和预后的判断也有一定的实际意义。本文研究含有HIV 1env、HIV 1gag的重组病毒诱导小鼠产生HIV 1env…     

蝎素组分Ⅲ对THP1细胞HMGB1表达的影响

目的:研究蝎素组分Ⅲ(Scorpion venom crudeⅢ,SVC-Ⅲ)对THP1细胞HMGB1表达的影响,探讨蝎素与HMGB1相互作用的机制。方法:不同浓度SVC-Ⅲ(0.1、1.0、10和100 ng/ml)刺激培养THP1细胞48小时后,RT-PCR检测HMGB1 RNA水平表达差异;Western blot检测HMGB1蛋白水平表达情况;激光共聚焦检测HMGB1在细胞中的分布情况。结果:1.0 ng/ml SVC-Ⅲ刺激培养THP1细胞,HMGB1 RNA及蛋白表达水平升高最显著,随着SVC-Ⅲ浓度的增加,HMGB1 RNA及蛋白的表达水平反而下降;SVC-Ⅲ刺激培养THP1细胞可引起HMGB1从胞核转移入胞浆。结论:SVC-Ⅲ可以刺激或抑制THP1细胞HMGB1的表达,其作用效果与剂量密切相关。     

HTLV-1病毒Tax蛋白对T淋巴细胞DcR3基因表达的影响

目的 探讨HTLV-1病毒Tax蛋白对T淋巴细胞DcR3基因表达的影响.方法 构建pGL3-DcR3-luc( -1010 bp- +114 bp)荧光素酶报告基因;利用脂质体介导的方法将pGL3 -DcR3 -luc转染到MT-2、TaxP、Jurkat细胞中,48h后检测DcR3荧光素酶报告基因的活性;利用脂质体介导的方法将梯度剂量的pCMV -Tax转染入Jurkat细胞,48 h后提RNA逆转录,real-time PCR检测DcR3 mRNA 的表达的变化;选用流式细胞技术检测MT-2、TaxP、Jurkat细胞表面DcR3蛋白的表达.结果 成功构建DcR3基因调控序列荧光素酶报告基因pGL3-DcR3-luc;荧光素酶活性的检测显示,与对照组相比,MT2细胞荧光素酶活性升高了32.07± 12.43倍,TaxP细胞荧光素酶活性升高了13.27±4.04倍,Jurkat细胞荧光素酶活性升高了1.26±0.49倍.与Jurkat细胞相比,MT2细胞和TaxP细胞的相对荧光素酶活性明显升高(P＜0.01);Real-time PCR结果显示,4组Ct内参/Ct目的基因的值依次是0.40±0.02、0.44±0.01、0.47±0.02、0.53±0.02; DcR3 mRNA的表达与转染pCMV-Tax存在着剂量依赖性(P＜0.05).流式细胞技术检测,MT2和TaxP细胞实验组DcR3蛋白的表达较对照组Jurkat细胞表达的高(P＜0.05).MT2细胞的结果是33.1 ±9.9,TaxP细胞的结果是35.1 ±4.8,Jurkat细胞的结果是16.9±2.3.结论 Tax蛋白能够促进DcR3基因在T细胞中的表达.     

人免疫缺陷病毒1型(HIV-1)gag基因疫苗的免疫原性

目的 :检测人免疫缺陷病毒 1型 (HIV 1)gag基因疫苗的免疫原性。方法 :分别以ELISA、荧光抗体染色和乳酸脱氢酶释放法 ,检测免疫小鼠血清抗体滴度、脾T细胞亚群的数量和淋巴细胞杀伤效应。结果 :血清抗体滴度、脾T细胞亚群的数量及淋巴细胞杀伤效应 ,重组质粒pVAXGAG免疫组与空载体pVAX1对照组相比较差异显著(分别为P <0 .0 5和P <0 .0 1)。结论 :HIV 1DNA疫苗质粒pVAXGAG在BALB/c小鼠中不仅可诱导特异性体液免疫 ,而且可诱导特异性细胞免疫。     

HLA-DRB1, -DQA1, -DQB1, -DPA1 and -DPB1 genes in Japanese multiple sclerosis patients

Japanese MS patients and controls were examined for the distribution of HLA-DRB1, -DQA1, -DQB1, -DPA1 and -DPB1 alleles using in vitro amplification of genomic DNA and probing with sequence-specific oligonucleotides. No significant difference in frequency of the examined alleles was observed among the two groups. This is in contrast to Norwegian MS patients, where an association to a combination of certain DQA1 and DQB1 alleles has previously been demonstrated.     

韩国人CYP450 1A1、CYP450 2E1和GSTM1、GSTT1、GSTP1基因座遗传多态性分析

目的 调查代谢相关的CYP4501A1、CYP4502E1和GSTM1、GSIT1、GSTP1基因座在韩国人群中的遗传多态性分布状况。方法 采用多重聚合酶链式反应、聚合酶链式反应-限制性片段长度多态性技术，分析300名韩国健康大学生的CYP1A1基因3′端限制性内切酶Msp Ⅰ位点、CYP2E1基因5′端转录调节区Pst Ⅰ位点和GSTM1、GSTT1缺失与存在、GSTP1基因第5外显子BsmA Ⅰ位点的基因型，计算基因型和基因频率。结果 CYP1A1基因型频率为ml／ml型39．7％、ml／m2型49．7％、m2／m2型10．7％，基因频率为ml 0．645、m2 0．355。CYP2E1基因型频率为cl／cl型66．7％、cl／c2型30％、c2／c2型3．3％，基因频率为C1 0．818、C2 0．182。GSTM1基因缺失型频率为53．3％。GSTT1基因缺失型频率为54．7％。GSTP1基因型频率为Ile／Ile型62％、Ile／Val型34．3％、VaL／Val型3．7％，基因频率为Ile 0．792、Val 0．208。基因分布符合Hardy-Weirtberg平衡定律。结论 韩国人CYP1A1、CYP2E1、GSTM1、GSTT1基因分布与我国人群较为相近，半数以上人缺乏GSTM1和GSTT1基因，纯合缺失型频率超过印度人的3倍。     

Maternal genetic polymorphisms in CYP1A1, GSTM1 and GSTT1 and the risk of hypospadias

Hypospadias is one of the most common congenital anomalies. Increased exposure to environmental factors (endocrine-disrupting chemicals and smoking) or maternal endogenous estrogen may cause hypospadias because male sexual differentiation is dependent on normal androgen homeostasis. Moreover, interactions between genetic factors and cigarette smoking and other chemicals have been suggested. It has been demonstrated that the CYP1A1 metabolizes not only environmental chemicals but also estrogens, and glutathione-S-transferases (GSTs) are detoxification enzymes that protect cells from toxicants by conjugation with glutathione. In this study, to investigate the association of CYP1A1 (MspI), GSTM1 and GSTT1 polymorphisms with hypospadias, a case-control study of 31 case mothers who had boys with hypospadias and 64 control mothers was performed in Japan. These polymorphisms were investigated by PCR-based methods using DNA from peripheral lymphocytes. We found that the heterozygous CYP1A1 and heterozygous and homozygous CYP1A1 were less frequent in the case mothers than in the control mothers [adjusted odds ratio (OR)=0.17, 95% confidence interval (CI)=0.04-0.74, OR = 0.28, 95% CI = 0.08-0.97, respectively]. We found no effect of maternal smoking on the hypospadias risks among the gene polymorphisms. The results suggest that mothers with the CYP1A1 MspI variant allele may have a decreased risk for hypospadias.     

神经系统RNA结合蛋白Musashi1 RRM1的初步结晶

目的 对Musashi1发挥功能的 RRM1结构域进行结晶,得到可用来衍射的蛋白晶体,为之后的结构解析打基础。方法 通过构建Musashi1RRM1的原核表达载体,并在BL21中表达、纯化高纯度的蛋白质,通过筛选结晶体条件得到蛋白晶体。结果 通过系统筛选和优化晶体生长条件得到了蛋白晶体。结论 Musashi1 RRM1的蛋白晶体质量较好,满足蛋白晶体衍射和数据收集的要求。     

NDE1 and NDEL1: Multimerisation,alternate splicing and DISC1 interaction

Nuclear Distribution Factor E Homolog 1 (NDE1) and NDE-Like 1 (NDEL1) are highly homologous mammalian proteins. However, whereas NDEL1 is well studied, there is remarkably little known about NDE1. We demonstrate the presence of multiple isoforms of both NDE1 and NDEL1 in the brain, showing that NDE1 binds directly to multiple isoforms of Disrupted in Schizophrenia 1 (DISC1), and to itself. We also show that NDE1 can complex with NDEL1. Together these results predict a high degree of complexity of DISC1-mediated regulation of neuronal activity.     

Rb1cc1 is critical for myoblast differentiation through Rb1 regulation

Rb1-inducible coiled-coil 1 (Rb1cc1) expressed at high levels is associated with the maturation of human embryonic musculoskeletal cells. To clarify the molecular role of Rb1cc1 in muscular differentiation, we investigated the expression of Rb1cc1 and other genes that regulate differentiation in murine embryonic tissues and in C2C12 myoblasts. We also evaluated the effects of RNA interference (RNAi)-mediated Rb1cc1 knockdown on C2C12 myoblast differentiation. After Rb1cc1, Rb1 and myosin heavy chain (Myhc) were expressed in mouse embryonic muscles. The synchronous expression of Rb1cc1 and Rb1 predicted Myhc expression during C2C12 myoblast differentiation. RNAi-mediated knockdown of Rb1cc1 led to Rb1 suppression, and C2C12 myoblasts failed to differentiate. These results indicated that Rb1cc1 is a potent regulator of the Rb1 pathway and a novel mediator that plays a crucial role in muscular differentiation. Rb1cc1 expression is, thus, a prerequisite for myogenic differentiation.     

FoxO1在小鼠感染流感病毒H1N1中的作用及机制

目的探讨叉头盒转录因子O1（forkhead box O1,FoxO1）在小鼠抵抗流感病毒H1N1感染中发挥的作用及机制。方法用琼脂糖凝胶电泳鉴定小鼠的基因型后,将小鼠分为2组:条件性敲除NKp46⁺细胞中FoxO1基因的Foxo1^△NK组小鼠,以及对照组WT小鼠;2组小鼠使用滴鼻法同1天感染流感病毒H1N1,每天记录小鼠体质量及2组小鼠的死亡情况;在2组小鼠体质量及状态差异明显的第10天取样,HE染色法观察肺组织病理;Luminex液相芯片技术检测肺组织匀浆上清中36种细胞因子的表达情况;流式细胞术检测肺组织免疫细胞的比例变化。结果与WT组相比,感染流感病毒后Foxo1^△NK组小鼠死亡率增加,体质量下降更加严重;肺组织病理显示炎症反应减弱;肺组织匀浆上清中的细胞因子表达水平下降,ENA-78、IFN-α、IL-4、IL-5显著降低;肺组织免疫细胞中CD3⁺NKp46⁺NKT细胞比例显著下降。结论 FoxO1基因的缺失加重了小鼠流感感染进程,可能是通过抑制依赖FoxO1基因调控...     

Ah receptor, CYP1A1, CYP1A2 and CYP1B1 gene polymorphisms are not involved in the risk of recurrent pregnancy loss

The etiology of recurrent pregnancy loss (RPL) remains unclear, but it may be related to a possible genetic predisposition together with involvement of environmental factors. We examined the relation between RPL and polymorphisms in four genes, human aryl hydrocarbon (Ah) receptor, cytochrome P450 (CYP) 1A1, CYP1A2 and CYP1B1, which are involved in the metabolism of a wide range of environmental toxins and carcinogens. All cases and controls were women resident in Sapporo, Japan and the surrounding area. The Ah receptor, CYP1A1, CYP1A2 and CYP1B1 genotypes were assessed in 113 Japanese women with recurrent pregnancy loss (RPL) and 203 ethnically matched women experiencing at least one live birth and no spontaneous abortion (control). No significant differences in Ah receptor, CYP1A1, CYP1A2 and CYP1B1 genotype frequencies were found between the women with RPL and the controls [Ah receptor: Arg/Arg (reference); Arg/Lys and Lys/Lys, odds ratio (OR)=0.67; 95% confidence interval (CI)=0.40-1.11, CYP1A1: m1m1 (reference); m1m2 and m2m2, OR = 0.86; 95% CI = 0.53-1.40, CYP1A2: C/C and C/A (reference); A/A, OR = 1.16; 95% CI = 0.71-1.88, CYP1B1: Leu/Leu (reference); Leu/Val and Val/Val, OR = 1.18; 95% CI = 0.68-2.02]. The present study suggests that the Ah receptor, CYP1A1, CYP1A2 and CYP1B1 gene polymorphisms are not major genetic regulators in RPL.     

Identification of two new HLA-DRB1 alleles,DRB1*1138 and DRB1*1344

Two new HLA-DRB1 alleles have been identified by sequencing based typing (SBT). HLA-DRB1*1138 and DRB1*1344 were discovered after following up ambiguous results involving unusual alleles after DRB1 generic typing.