Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain.
Ragon Institute of MGH, MIT, and Harvard, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States.
Front Immunol. 2019 Jun 6;10:1306. doi: 10.3389/fimmu.2019.01306. eCollection 2019.
Dendritic cells (DCs) are professional antigen-presenting cells that link innate and adaptive immunity and are critical for the induction of protective immune responses against pathogens. Proportions of these cells are markedly decreased in the blood of untreated HIV-1-infected individuals, suggesting they might be intrinsically involved in HIV-1 pathogenesis. However, despite several decades of active research, the precise role and contribution of these cells to protective or detrimental host responses against HIV-1 are still remarkably unclear. Recent studies have shown that DCs possess a fine-tuned machinery to recognize HIV-1 replication products through a variety of innate pathogen sensing mechanisms, which may be instrumental for generating both cellular and humoral protective immune responses in persons who naturally control HIV-1 replication. Yet, dysregulated and abnormal activation of DCs might also contribute to sustained inflammation and immune activation accelerating disease progression during chronic progressive infection. Emerging data also suggest that DCs can influence the induction of potent broadly-neutralizing antibodies, and may, for this reason, have to be considered as important components of future HIV-1 vaccination strategies. Apart from their involvement in antiviral host immunity, at least a subgroup of DCs seem intrinsically susceptible to HIV-1 infection and may serve as a viral target cell population. Indeed recent studies suggest that specific DC subpopulations residing in the genital mucosa are preferentially infected by HIV-1 and play an active role in sexual transmission; therefore, DCs may contribute to viral dissemination and possible persistence of the viral reservoirs through either direct or indirect mechanisms. Here, we analyze the distinct and partially opposing roles of DCs during HIV-1 disease pathogenesis, with a focus on implications of DC biology natural immune control and HIV cure research efforts.
树突状细胞 (DCs) 是专业的抗原呈递细胞,连接先天免疫和适应性免疫,对诱导针对病原体的保护性免疫反应至关重要。未经治疗的 HIV-1 感染个体血液中的这些细胞比例明显下降,表明它们可能内在参与 HIV-1 发病机制。然而,尽管经过几十年的积极研究,这些细胞在保护性或有害宿主对 HIV-1 的反应中的精确作用和贡献仍然非常不清楚。最近的研究表明,DC 通过多种先天病原体感应机制,拥有识别 HIV-1 复制产物的精细调控机制,这可能对于在自然控制 HIV-1 复制的个体中产生细胞和体液保护性免疫反应至关重要。然而,DC 的失调和异常激活也可能导致持续的炎症和免疫激活,加速慢性进行性感染中的疾病进展。新出现的数据还表明,DC 可以影响强效广谱中和抗体的诱导,并且可能因此被视为未来 HIV-1 疫苗接种策略的重要组成部分。除了它们在抗病毒宿主免疫中的参与外,至少有一组 DC 似乎容易受到 HIV-1 的感染,并且可以作为病毒靶细胞群。事实上,最近的研究表明,生殖器黏膜中存在的特定 DC 亚群更容易被 HIV-1 感染,并在性传播中发挥积极作用;因此,DC 可能通过直接或间接机制导致病毒传播和病毒储存库的可能持续存在。在这里,我们分析了 DC 在 HIV-1 发病机制中的不同且部分相反的作用,重点关注 DC 生物学自然免疫控制和 HIV 治愈研究努力的影响。