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丙型肝炎病毒基因突变与免疫逃逸 总被引:1,自引:0,他引:1
免疫逃逸(Immune evasion)是指病原体逃避机体免疫监控的现象。在宿主和病毒的长期共同进化过程中,病毒形成了各种逃选机制以逃避宿主的免疫监控,其中病毒基因变异是最主要机制。丙型肝炎病毒(Hepatitis C virus,HCV)在感染个体中表现出极高的基因异质性,能有效地逃逸机体免疫识剐和破坏宿主免疫应答的能力,HCV还可侵袭免疫细胞来抑制机体的免疫功能,而建立HCV持续性感染。了解HCV病毒突变与免疫逃逸机制将会为预防和控制丙型肝炎提供依据。 相似文献
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丙型肝炎病毒(HCV)是由约9.6kb个核苷酸组成的单股正链RNA病毒,属于黄病毒科丙型肝炎病毒属,被分为7个基因型及若干亚型。丙型肝炎是由HCV感染引起的常见血液传播型疾病,全球约有1.8亿人感染,引起慢性肝炎、肝硬化、肝癌。至今没有针对HCV的保护性疫苗,目前批准的标准治疗方式主要是聚乙二醇-干扰素(PEG-IFN)和利巴韦林(RBV)的联合疗法。目前这种疗法对不同基因型的感染患者的作用效果差异很大,对HCV基因2型及3型的患者,80%可以获得持续的病毒学应答反应(SVR),然而 相似文献
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丙型肝炎病毒蛋白作用于细胞信号转导途径的研究进展 总被引:1,自引:0,他引:1
细胞信号转导异常往往与人类疾病的发生、发展密切相关。一些病毒致病和感染机制即为病毒抗原蛋白作用宿主细胞信号转导途径,导致宿主细胞内信号转导发生紊乱。丙型肝炎病毒(HCV)是引发慢性丙型肝炎,导致肝硬化和肝细胞癌发生的主要病原体,但目前HCV的致病机制与宿主内持续感染机制尚不清楚。HCV致病机制可能与HCV表达的蛋白质干扰宿主细胞信号转导途径而导致异常的细胞信号转导有关。研究HCV蛋白对宿主细胞信号转导途径的影响不仅有助于阐明其致病机制,还能为新药设计和寻找新的治疗方法提供新思路和新靶点。本文主要综述了近年来国内外有关HCV蛋白作用细胞信号转导途径的研究进展。 相似文献
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目的:分析影响干扰素-α(IFN-α)治疗慢性乙型肝炎(CHB)疗效的因素。方法:选择2006年到2009年青岛市传染病医院住院的CHB患者46例,应用IFN-α治疗48周,根据IFN-α治疗的疗效将其分为应答组与无应答组,评价患者的宿主、病毒载量及生化指标等因素对疗效的影响。结果:两组间的性别比例、年龄和病程无显著差异(P〉0.05),应答组治疗前HBV-DNA载量低于无应答组,ALT水平高于无应答组,HBeAg阳性患者的应答率高于HBeAg阴性患者,差异均具有统计学意义(P〈0.05),应答组在治疗12周时HBV-DNA载量下降〉2log的比例高于无应答组,差异具有统计学意义(P〈0.05)。结论:治疗前HBVDNA载量低、ALT水平高和HBeAg阳性以及治疗12周时的HBVDNA应答可以作为干扰素-α治疗慢性乙型肝炎48周时应答的预测因素。 相似文献
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李小宁 《中国微生态学杂志》2010,22(7):628-630
目的研究皖南地区丙型肝炎病毒治疗前后高变区1(HVR1)碱基变异数量与病情变化和治疗效果之间是否具有相关性。方法应用速率法和荧光定量PCR法,检测皖南地区141例慢性丙型肝炎患者血清ALT水平和HCV RNA的载量。应用RT-PCR法进行HCV基因型和治疗前后的HVR1区域序列的检测。结果 141例患者的血清ALT与HCV RNA两指标间采用Spearman等级相关分析显示,rs=0.213,P=0.011,差异具有统计学意义,存在正相关。通过HCV基因1型、2型和未分型3组的HVR1碱基变异数量的单因素方差分析,显示组与组之间差异具有统计学意义。结论慢性丙型肝炎患者治疗前后的HVR1序列碱基变异数量的分析,对治疗效果、病情变化及预后发展等方面的评估具有重要的指导意义。 相似文献
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丙型肝炎病毒(Hepatitis C virus, HCV)是造成慢性肝炎、肝硬化乃至肝癌的主要原因之一, 严重威胁人类健康。宿主因素可影响HCV的感染、治疗效果和自然清除率。近期, 欧美多个研究组对自愈和经过治疗的慢性丙型肝炎患者进行了全基因组关联分析(Genome-wide association study, GWAS), 证明IL28B基因(编码IFN-λ3)的单核苷酸多态位点(Single nucleotide polymorphism, SNP)影响HCV患者的治疗效果和自然清除率。IFN-λ3通过与其异源二聚受体IFN-λR1·IL-10R2结合进行信号传导, 上调干扰素刺激基因的表达, 进而发挥抗病毒、抑制肿瘤细胞生长以及免疫调节等生物学功能, 有望成为一种新型抗HCV药物。虽然IL28B基因SNP影响病毒清除的机制尚未清楚, 但其关联分析结果可作为HCV患者临床治疗的辅助指导, 对HCV患者进行IL28B基因遗传易感和功能研究将有助于该病的预防和治疗。 相似文献
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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 相似文献
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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. 相似文献
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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. 相似文献
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Meng Miao Gang Deng Xiaobei Xiong Yang Qiu Wenda Huang Meng Yuan Fei Yu Shimei Bai Xi Zhou Xiaolu Zhao 《中国病毒学》2022,37(2):314-317
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. 相似文献
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. 相似文献
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Dong Liu Xin Wang Yisong Wang Peigang Wang Dongying Fan Sichang Chen Yuguang Guan Tianfu Li Jing An Guoming Luan 《中国病毒学》2018,33(5):402-409
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. 相似文献
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Shen Jia-Yuan Li Man Xie Lyu Mao Jia-Rong Zhou Hong-Ning Wang Pei-Gang Jiang Jin-Yong An Jing 《中国病毒学》2021,36(1):145-148
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). 相似文献
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Renfei Lu Xiuming Wu Zhenzhou Wan Yingxue Li Lulu Zuo Jianru Qin Xia Jin Chiyu Zhang 《中国病毒学》2020,35(3):344-347
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. 相似文献