人巨细胞病毒

疱疹病毒科巨细胞病毒属病毒

人巨细胞病毒(英语:Human cytomegalovirusHCMV)或称人类疱疹病毒第五型(英语:Human betaherpesvirus 5HHV-5),属于β疱疹病毒亚科,是巨细胞病毒(CMV)中以人类为宿主的一种DNA病毒[2]HCMV因其细胞病变效应而得名,感染后可引发核周细胞质包涵体的产生以及细胞肿胀。在人类疱疹病毒(HHV)中,HCMV具有最大的基因组长度,约240kbp。[3]尽管HCMV的增殖周期较慢,它的基因表达调控类似于α疱疹病毒,会产生IE、E和L等基因产物呈序列性出现。[4]若基于病毒的基因组或表型进行分析,HCMV中可含有无数独特的毒株。利用限制性酶切分析,可从流行病学角度上区分亚型。在实验室环境中培养的毒株一般会损失10-15kbp的基因,因此对病毒屈性有一定限制作用。[2]

人巨细胞病毒
图为被HCMV感染的肺细胞
病毒分类 编辑
(未分级) 病毒 Virus
域: 双链DNA病毒域 Duplodnaviria
界: 香港病毒界 Heunggongvirae
门: 衣壳病毒门 Peploviricota
纲: 疱疹病毒纲 Herviviricetes
目: 疱疹病毒目 Herpesvirales
科: 疱疹病毒科 Herpesviridae
种:
人巨细胞病毒 Human cytomegalovirus
异名[1]
  • 人类疱疹病毒第五型
    Human herpesvirus 5

病毒学

HCMV属于疱疹病毒中的一种,是现今被发现的最大的DNA病毒和蛋白嵌合体,蛋白种类繁多。[5]1956年,HCMV病毒首次从人体样本中分离而出。[6][7]其DNA由线状双链分子组成,长度可达240kbp。其病毒颗粒一般直径为150-200nm,有单层或双层的类脂蛋白套膜。[3][8]在脂质层外有多种糖蛋白,负责对宿主细胞的粘附与入侵。[9]HCMV病毒至少具有165种编码蛋白,不同的毒株内可能会有更多开放阅读框。[10][11]这些编码蛋白绝大部分是高度保守的,分布在病毒的衣壳、被膜以及包膜中。[12]其基因表达因而非常复杂,其中包括蛋白转录、非编码RNA和asRNA的多腺苷酸化等,且现有研究对HCMV绝大多数转录本的功能依旧不了解。[13]

受HCMV感染的细胞种类包括成纤维细胞内皮细胞上皮细胞髓细胞,不同的细胞种类决定了HCMV进入宿主细胞是基于膜融合或pH介导的胞吞作用[14][15]其中,膜融合适用于成纤维细胞,这一过程由gH/gL/gO蛋白复合体介导。另一种方式则常见于内皮及上皮细胞,需要利用一种由gH/gL/UL128/UL130/UL131组成的五聚体来介导。[16][17]

流行病学

HCMV属于一种流行普遍的病毒,但它具有种属特异性,只会感染人类群体。[18]HCMV的主要宿主细胞是人类血管内皮细胞以及白细胞,但只有在前者中会呈现独特的细胞核包涵体,一般会俗称为“猫头鹰眼睛”。[2][19]在全世界范围内有至少50%以上的人群体内存在相应的抗体,一些较落后地区的感染率更高。[2]受HCMV感染后的主要特征是会抑制宿主的免疫应答,这导致它成为艾滋病人最常具有的伺机性感染。[20][21]

对HCMV的传播模式至今没有准确的定论,现今的共识为它可通过感染者的体液进行传染,包括常规的体液交换、性行为、输血以及器官移植等多种方式。[22][23]

参考文献

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