用聚合酶链反应检测T细胞白血病／淋巴瘤中HTLV－I前病毒DNA

用聚合酶链反应检测Ｔ细胞白血病／淋巴瘤中ＨＴＬＶ－Ｉ前病毒ＤＮＡ陈国敏,何士勤,王柠,张永利,曾毅（中国预防医学科学院病毒学研究所北京１０００５２）关键词聚合酶链反应（ＰＣＲ）,人Ｔ淋巴细胞病毒Ｉ型（ＨＴＬＶ－Ｉ）,前病毒,基因整合目前,国内对人Ｔ淋...     

人嗜T淋巴细胞白血病病毒I型(HTLV-Ⅰ)核心蛋白(p24)基因的克隆及在大肠杆菌中的表达

人嗜Ｔ淋巴细胞白血病病毒Ｉ型（ＨＴＬＶ－Ⅰ）核心蛋白（ｐ２４）基因的克隆及在大肠杆菌中的表达段震峰,滕志平,纪志武,陈国敏,张永利,曾毅（中国预防医学科学院病毒学研究所,北京１０００５２）关键词人嗜Ｔ淋巴细胞白血病病毒Ｉ型（ＨＴＬＶ－Ｉ）,聚合酶链反...     

人类T细胞白血病病毒I型pX基因反式调节和致白血病机理的研究进展

人类Ｔ细胞白血病病毒Ｉ型（ＨＴＬＶ－Ｉ）是成人Ｔ细胞白血病（ＡＴＬ）的病因。ＨＴＬＶ－Ｉ基因组中的ｐＸ基因区域编码ｐ４０＾ｔａｘ和ｐ２７＾ｒｅｘ蛋白,前者可反式激活病毒的ＬＴＲ和ＩＬ－２Ｒ及ｃ－ｆｏｓ、ＴＧＦβ１等细胞基因,加强转录过程,在白血病发生中发挥重要作用。ｐ２７＾ｒｅｘ蛋白则在转录后水平进行反馈性调节。白血病的发生机理是多因子参加的多步骤过程。     

我国福建省福清地区HTLV－Ⅰ无症状携带者体内HTLV－Ⅰ病毒核酸的检测

我国福建省福清地区ＨＴＬＶ－Ⅰ无症状携带者体内ＨＴＬＶ－Ⅰ病毒核酸的检测陈国敏,薛守贵,张永利,林惠添,董德华,林星,魏礼康,陈武,曾毅（中国预防医学科学院病毒学研究所,北京１０００５２）关键词嗜人Ｔ细胞病毒Ⅰ型,无症状携带者,聚合酶链反应,核酸杂交...     

持续性病毒感染免疫应答的群体动力学

本文以数学模式来探讨抗病毒免疫应答、病毒含量以及病毒变异性间的关系。由数学模式表明的结果并与人血病病毒Ｉ型（ＨＴＬＶ－Ｉ）和人类免疫缺陷病毒Ｉ型（ＨＩＶ－１）感染中杀伤性Ｔ细胞反应和病毒变异性研究的研究资料进行比较,获得较为一致的结果。     

人T细胞白血病病霉Ⅰ型env基因的克隆与表达

本文通过聚合酶链式反应（ＰＣＲ）,从整合有人Ｔ细胞白血病病毒Ⅰ型（ＨＴＬＶ－Ｉ）的ＭＴ－２细胞株中,扩增出ＨＴＬＶ－Ｉ外膜蛋白（ｅｎｖ）的全基因（１．４５ｋｂ）,并成功地克隆入ｐＵＣ１９载体,构建成ｅｎｖ基因克隆ｅｎｖ／ｐＵＣ１９．利用原核高效表达载体ｐＧＥＸ－２Ｔ,在大肠杆菌中有效地表达了与谷胱甘肽Ｓ－转移酶（ＧＳＴ）融合的ｅｎｖ羧基末端抗原的重组蛋白,融合基因的转录由ｔａｃ启动子调控。ＳＤＳ－ＰＡＧＥ结果表明,有一约５２ｋＤ的目的蛋白带,表达量占菌体总蛋白的１０％;ＷｅｓｔｅｒＮｂｌｏｔｔ及ＥＬＩＳＡ结果显示,表达产物能与ＨＴＬＶ－Ｉ多抗血清结合。本研究为研制ＨＴＬＶ－Ｉ的诊断试剂及进一步了解ｅｎｖ的免疫学和生物学性质打下了基础。     

人类嗜T细胞白血病Ⅰ型病毒TAX蛋白对NF—kB转录因子的作用

人类嗜Ｔ细胞白血病Ⅰ型病毒（ＨＴＬＶ－Ⅰ）是成人Ｔ细胞白血病（ＡＴＬ）的致病因子,其编码的ＴＡＸ蛋白的反式激活在白血病形成中有重要作用。ＮＦ－ｋＢ是细胞活化和产生细胞因子的重要转录调控因子。正常情况下,ＮＦ－ｋＢ因子与抑制性蛋白ＩＫＢ结合,形成复合物存在于胞质中。ＴＡＸ蛋白可与ＩＫＢ激酶γ（ＩＫＫγ）直接结合,而后启动ＴＡＸ对ＩＫＫα和ＩＫＫβ的结合,并使之发生磷酸化。后者使ＩＫＢ蛋白降解,ＮＦ－     

福建沿海地区人T淋巴细胞白血病病毒1型膜基因的克隆和系统树分析

人Ｔ淋巴细胞白血病病毒１型（ＨＴＬＶ－１）是最早发现的一种ＲＮＡ肿瘤病毒。利用ＨＴＬＶ－１基因组长末重复区（ＬＴＲ）或膜基因（ｅｍｖ）序列进行系统树分析,可分为Ｃ、Ｊ、ＷＡ、ＣＡ和Ｍ５个亚型。为了解我国ＨＴＬＶ－１流行区毒株的主要基因型别,从福建莆田地区克隆出３株ＨＴＬＶ－１的ｅｎｖ基因。其序列与已知各亚型代表株进行系统树分析,结果表明均为Ｃ亚型。首次证实了中国大陆ＨＴＬＶ－１Ｃ亚型的存在。该地区     

HTLV流行病学,遗传学和检测方法研究进展

ＨＴＬＶ是成人Ｔ细胞白血病和热带痉挛性麻痹症等疾病的致病因子,具有复杂的调控机制。由于所致疾病的危害性,及具有血液传播的特性,受到了广泛的重视。本文仅就ＨＴＬＶ流行病学,遗传学和检测方法方面的最新研究进展作一介绍。     

应用核酶的RNA修复功能治疗遗传疾病

十多年前 ,人们即已利用核酶 (ｒｉ ｂｏｚｙｍｅ)定点切割ＲＮＡ分子的特性 ,开始设计核酶进行抗病毒、抗肿瘤和针对某些疾病的研究 ,取得了不少进展。目前 ,针对乙肝病毒 (ＨＢＶ)和丙肝病毒 (ＨＣＶ)的核酶治疗进入了预临床 ,而针对人免疫缺损病毒 (ＨＩＶ)的核酶治疗正在进行Ｉ期 /ＩＩ期临床试验。此外 ,核酶抗病毒研究的对象有 :Ａ型流感病毒、人乳头状瘤病毒 (ＨＰＶ)、人Ｔ细胞白血病病毒 (ＨＴＬＶ)、昆虫核多角体病毒 (ＮＰＶ)等。依据同样原理 ,在了解肿瘤发病的分子机制的基础上 ,可设计核酶进行抗肿瘤研究 ,如切割ＢＣＲ/ＡＢ…     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

Enterovirus 71 3C proteolytically processes the histone H3 N-terminal tail during infection

Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions.     

Detection of EBV and HHV6 in the Brain Tissue of Patients with Rasmussen’s Encephalitis

Rasmussen’s encephalitis (RE) is a rare pediatric neurological disorder, and the exact etiology is not clear. Viral infection may be involved in the pathogenesis of RE, but conflicting results have reported. In this study, we evaluated the expression of both Epstein-Barr virus (EBV) and human herpes virus (HHV) 6 antigens in brain sections from 30 patients with RE and 16 control individuals by immunohistochemistry. In the RE group, EBV and HHV6 antigens were detected in 56.7% (17/30) and 50% (15/30) of individuals, respectively. In contrast, no detectable EBV and HHV6 antigen expression was found in brain tissues of the control group. The co-expression of EBV and HHV6 was detected in 20.0% (6/30) of individuals. In particular, a 4-year-old boy had a typical clinical course, including a medical history of viral encephalitis, intractable epilepsy, and hemispheric atrophy. The co-expression of EBV and HHV6 was detected in neurons and astrocytes in the brain tissue, accompanied by a high frequency of CD8⁺ T cells. Our results suggest that EBV and HHV6 infection and the activation of CD8⁺ T cells are involved in the pathogenesis of RE.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.