Anti-inflammatory and antiviral effects of minocycline in enterovirus 71 infections - 18/09/19

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Graphical abstract |
Highlights |
• | Cytokines play cardinal roles in the pathogenesis of EV71 brain stem encephalitis. |
• | Anti-inflammatory properties of minocycline are the most important neuroprotective mechanism. |
• | Minocycline treatment after EV71 infection possessed not only anti-inflammatory but also antiviral characteristics in vitro. |
• | Minocycline treatment reduced mortality and disease severity in EV71-infected mice. |
• | This work provides potentials for initiation therapeutic strategies in severe EV71-infected patients. |
Abstract |
Enterovirus 71 (EV71) brainstem encephalitis (BE) is divided into—uncomplicated BE, autonomic nervous system (ANS) dysregulation, and pulmonary edema (PE)—based on cytokine-mediated severe systemic and central nervous system (CNS) inflammatory responses. Minocycline has been found to have anti-inflammatory and immunomodulatory properties in infectious and inflammatory neurological disease models. The effects of minocycline on EV71 infection were studied in vitro and in vivo experiments. The minocycline treatment (100–300 μg/mL) on cytokine expressions and viral replications were investigated in rhabdomyosarcoma (RD), U-87MG, and THP-1 cells. The mouse-adapted-EV71 strain (MP4)-infected 7-day-old ICR mice model was used to explore the anti-inflammatory and antiviral effects of minocycline (1 and 5 μg/g) for the treatment of EV71 infection. In in vitro, minocycline reduced cytopathic effects (CPEs), viral protein expressions, viral titers, the levels of interleukin (IL)-6 and IL-8 and relative mRNA expressions of IL-12p40, IL-1β, and tumor necrosis factor (TNF) after EV71 infection. The levels of TNF, IL-1β, IL-6, and IL-8 decreased with a single dose of minocycline in EV71-infected THP-1 cells. Double-dose minocycline treatment demonstrated more effective reduction in cytokines. In the MP4-infected animal model, clinical scores, mortality rates and viral titers in various brain tissues were decreased evidently after double-dose minocycline treatment. Minocycline inhibited IL-6 and granulocyte colony-stimulating factor (G-CSF) in plasma and TNF in the cerebellum. Minocycline has properties that enable it to function both as an anti-inflammatory and antiviral agent in EV71 infection. These results evidence its potential usefulness in clinical treatment.
Le texte complet de cet article est disponible en PDF.Abbreviations : EV71, BE, ANS, PE, CNS, RD, U-87 MG, THP-1, MP4, CPEs, G-CSF, IP-10, MCP-1, MIG, PMA, HRP, MOI, hpi, PFU, OSBP, HIV, WNV, JEV
Chemical compounds studied in this article : Minocycline hydrochloride (PubChem CID: 54685925), Phorbol 12-myristate 13-acetate (PubChem CID: 27924)
Keywords : Enterovirus 71, Systemic inflammatory response, Minocycline, Anti-inflammatory agent, Antiviral effect
Plan
Vol 118
Article 109271- octobre 2019 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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