1887

Abstract

Oropouche virus (OROV) is the aetiological agent of Oropouche fever, the symptoms of which are common to most arboviruses, such as fever, headache, malaise, nausea and vomiting. More than half a million people have been infected with OROV since its isolation in 1955. Although Oropouche fever is classified as a neglected and emerging disease, to date, there are no antiviral drugs or vaccines available against the infection and little is known about its pathogenicity. Therefore, it is essential to elucidate the possible mechanisms involved in its pathogenesis. Since oxidative stress plays a pivotal role in the progression of various viral diseases, in this study, redox homeostasis in the target organs of OROV infection was evaluated using an animal model. Infected BALB/c mice exhibited reduced weight gain, splenomegaly, leukopenia, thrombocytopenia, anaemia, development of anti-OROV neutralizing antibodies, increased liver transaminases, and serum levels of pro-inflammatory cytokines tumour necrosis factor (TNF-α) and interferon-γ (IFN-γ). The OROV genome and infectious particles were detected in the liver and spleen of infected animals, with liver inflammation and an increase in the number and total area of lymphoid nodules in the spleen. In relation to redox homeostasis in the liver and spleen, infection led to an increase in reactive oxygen species (ROS) levels, increased oxidative stress biomarkers malondialdehyde (MDA) and carbonyl protein, and decreased activity of the antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT). Taken together, these results help elucidate some important aspects of OROV infection that may contribute to the pathogenesis of Oropouche.

Funding
This study was supported by the:
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Award 001)
    • Principle Award Recipient: MaríliaBueno da Silva Menegatto
  • Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade Federal de Ouro Preto (Award PROPPI/UFOP No. 03/2023)
    • Principle Award Recipient: CintiaLopes de Brito Magalhães
  • Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade Federal de Ouro Preto (Award 3109.000928/2020-33)
    • Principle Award Recipient: CintiaLopes de Brito Magalhães
  • Pró-Reitoria de Pesquisa e Pós-Graduação, Universidade Federal de Ouro Preto (Award 3109.004080/2019-88)
    • Principle Award Recipient: CintiaLopes de Brito Magalhães
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/content/journal/jgv/10.1099/jgv.0.001857
2023-05-16
2024-12-09
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