Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
Acta Trop. 2024 Apr;252:107146. doi: 10.1016/j.actatropica.2024.107146. Epub 2024 Feb 9.
Mayaro virus (MAYV), the etiological agent of Mayaro fever (MAYF), is an emergent arbovirus pathogen belonging to Togaviridae family. MAYF is characterized by high inflammatory component that can cause long-lasting arthralgia that persists for months. Macrophages are viral targets and reservoirs, key components of innate immunity and host response. Given the importance of this pathogen, our aim was to determine the inflammatory and antiviral response of human monocyte-derived macrophages (MDMs) infected with MAYV. First, we established the replication kinetics of the virus. Thereafter, we determined the expression of pattern recognition receptors, NF-ĸB complex, interferons (IFNs), two interleukin 27 (IL27) subunits, IFN-stimulated genes (ISGs), and the production of cytokines/chemokines. We found that human MDMs are susceptible to MAYV infection in vitro, with a peak of viral particles released between 24- and 48-hours post-infection (h.p.i) at MOI 0.5, and between 12 and 24 h.p.i at MOI 1. Interestingly, we observed a significant decline in the production of infectious viral particles at 72 h.p.i that was associated with the induction of antiviral response and high cytotoxic effect of MAYV infection in MDMs. We observed modulation of several genes after MAYV infection, as well, we noted the activation of antiviral detection and response pathways (Toll-like receptors, RIG-I/MDA5, and PKR) at 48 h.p.i but not at 6 h.p.i. Furthermore, MAYV-infected macrophages express high levels of the three types of IFNs and the two IL27 subunits at 48 h.p.i. Moreover, we found higher production of IL6, IL1β, CXCL8/IL8, CCL2, and CCL5 at 48 h.p.i as compared to 6 h.p.i. A robust antiviral response (ISG15, APOBEC3A, IFITM1, and MX2) was observed at 48 but not at 6 h.p.i. The innate and antiviral responses of MAYV-infected MDMs differ at 6 and 48 h.p.i. We conclude that MAYV infection induces robust pro-inflammatory and antiviral responses in human primary macrophages.
马亚罗病毒(MAYV)是马亚罗热(MAYF)的病原体,属于披膜病毒科。MAYF 的特点是炎症成分高,可引起持续数月的关节痛。巨噬细胞是病毒的靶标和储库,是先天免疫和宿主反应的关键组成部分。鉴于该病原体的重要性,我们的目的是确定感染 MAYV 的人单核细胞衍生的巨噬细胞(MDM)的炎症和抗病毒反应。首先,我们建立了病毒的复制动力学。此后,我们测定了模式识别受体、NF-ĸB 复合物、干扰素(IFN)、两种白细胞介素 27(IL27)亚单位、IFN 刺激基因(ISG)和细胞因子/趋化因子的表达。我们发现人 MDM 在体外易受 MAYV 感染,在感染后 24-48 小时(h.p.i)MOI 为 0.5 时病毒粒子释放峰值最高,在感染后 12-24 小时(h.p.i)MOI 为 1 时病毒粒子释放峰值最高。有趣的是,我们观察到在 72 h.p.i 时感染性病毒粒子的产量显著下降,这与抗病毒反应的诱导和 MAYV 在 MDM 中的高细胞毒性作用有关。我们还观察到 MAYV 感染后几个基因的调节,并且在 48 h.p.i 时观察到抗病毒检测和反应途径(Toll 样受体、RIG-I/MDA5 和 PKR)的激活,但在 6 h.p.i 时没有。此外,在 48 h.p.i 时,感染的巨噬细胞表达高水平的三种类型的 IFN 和两种 IL27 亚单位。此外,与 6 h.p.i 相比,我们发现在 48 h.p.i 时产生了更高水平的 IL6、IL1β、CXCL8/IL8、CCL2 和 CCL5。在 48 h.p.i 时观察到强大的抗病毒反应(ISG15、APOBEC3A、IFITM1 和 MX2),而在 6 h.p.i 时则没有。在 6 和 48 h.p.i,感染 MAYV 的 MDM 的先天和抗病毒反应不同。我们得出结论,MAYV 感染诱导人原代巨噬细胞中强烈的促炎和抗病毒反应。
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