Department of Microbiology & Cell Biology, Indian Institute of Science, Bengaluru, India.
Centre for Infectious Disease Research, Indian Institute of Science, Bengaluru, India.
Front Cell Infect Microbiol. 2020 Oct 2;10:580096. doi: 10.3389/fcimb.2020.580096. eCollection 2020.
Dengue fever is an mosquito-borne illness caused by any one of the four different dengue virus (DENV) serotypes (1-4) and manifests in the form of symptoms ranging from mild or asymptomatic to severe disease with vascular leakage, leading to shock, and viral hemorrhagic syndrome. Increased risk of severe disease occurs during secondary infection with a virus serotype distinct from that of prior dengue infection. This occurs by antibody dependent enhancement (ADE) of infection, wherein sub-neutralizing antibodies against the virus particles opsonize dengue virus entry via formation of immune complexes that interact with fragment crystallizable gamma receptors (FcγR) on monocytes, dendritic cells, and macrophages. The ADE phenomenon has two components: Extrinsic and Intrinsic ADE. While extrinsic ADE contributes to enhanced virus entry, intrinsic ADE results in heightened virus production by inhibition of type1 interferon and activation of interleukin-10 biosynthesis, thereby favoring a Th2 type immune response. Intrinsic ADE has greater contribution in enhancing Dengue replication as compared to extrinsic ADE. Detailed elucidation of intrinsic ADE during secondary dengue infection can increase our understanding of DENV-pathogenesis and aid in the development of host-targeting antivirals. Here we review literature focusing on intrinsic factors contributing to severe dengue pathology and suggest possible avenues for further research.
登革热是一种由四种不同的登革病毒(DENV)血清型(1-4)引起的蚊媒病,表现为从轻度或无症状到血管渗漏、导致休克和病毒性出血综合征的严重疾病。在继发感染与先前登革热感染的病毒血清型不同的病毒时,发生严重疾病的风险增加。这是通过感染的抗体依赖性增强(ADE)发生的,其中针对病毒颗粒的亚中和抗体通过形成免疫复合物来调理登革病毒进入,该免疫复合物与单核细胞、树突状细胞和巨噬细胞上的片段结晶γ受体(FcγR)相互作用。ADE 现象有两个组成部分:外在 ADE 和内在 ADE。虽然外在 ADE 有助于增强病毒进入,但内在 ADE 通过抑制 1 型干扰素和激活白细胞介素-10 生物合成导致病毒产生增加,从而有利于 Th2 型免疫反应。与外在 ADE 相比,内在 ADE 对增强登革热复制的贡献更大。在二次登革热感染期间对内在 ADE 的详细阐明可以增加我们对 DENV 发病机制的理解,并有助于开发针对宿主的抗病毒药物。在这里,我们回顾了专注于导致严重登革热病理的内在因素的文献,并提出了进一步研究的可能途径。
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