Inflammation associated with monocyte/macrophage activation and recruitment corresponds with lethal outcome in a mouse model of Crimean-Congo haemorrhagic fever

作者：Teresa E. Sorvillo, Jana M. Ritter, Stephen R. Welch, JoAnn D. Coleman-McCray, Katherine Davies, Heather M. Hayes, Scott D. Pegan, Joel M. Montgomery, Éric Bergeron, Christina F. Spiropoulou, Jessica R. Spengler · 发表于：Emerging Microbes & Infections · 年份：2024 · DOI：10.1080/22221751.2024.2427782 · 被引用次数：7 · 研究领域：Viral Infections and Vectors、Mosquito-borne diseases and control、Viral Infections and Outbreaks Research

Crimean-Congo hemorrhagic fever virus (CCHFV) causes human disease ranging from subclinical to a fatal hemorrhagic syndrome. Determinants of CCHF pathogenesis are largely unknown and animal models that recapitulate human disease are limited. A recently described mouse model uses a monoclonal antibody (mAb 5A3) targeting the interferon (IFN) alpha/beta receptor to suppress type I IFN responses, making animals transiently susceptible to infection. To advance utility of this model, we investigated effects of challenge route, timing of 5A3 delivery, mouse sex and age, and virus strain on clinical course and outcome. C57BL/6J mice received mAb 5A3 -1, 0, or -1/+1 days post-infection (dpi). Subsets were challenged with CCHFV strain Turkey04 or IbAr10200 subcutaneously or intraperitoneally, and serially euthanized 3- and 7-dpi, when meeting euthanasia criteria or at study completion (14 dpi). CCHFV-IbAr10200-infected mice almost uniformly succumbed to infection, whereas CCHFV-Turkey04-infected mice transiently lost weight but survived. These results were consistent regardless of mAb timing or route of challenge. Viral replication and dissemination were comparable between the two strains at 3 dpi. However, in the plasma and livers of non-survivors, expression of proinflammatory cytokines/chemokines that correspond with macrophage activation and recruitment were significantly elevated. Lethal disease was also associated with elevated levels of macrophage activation marker CD163 in pla...