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© Pierre Gounon
Culture de cellules infectées par le virus Ebola, virus isolé sur un malade de Côte d'Ivoire par Leguenno en 1995. Virus de la famille des Filoviridae genre Filovirus. Réservoir naturel et mode de transmission inconnus. Infections secondaires par contact direct avec sang contaminé ou sécrétions corporelles. Mortalité dans 50 à 90% des cas. Soudan, République Démocratique du Congo, Côte d'Ivoire (Grossissement X 40000).
Publication : Microbes and infection

Role of interferons in the control of Lassa virus replication in human dendritic cells and macrophages

Team: Biology of Viral Emerging Infections
Member: Sylvain Baize
Member: Mathieu Mateo
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Microbes and infection - 20 Mar 2006

Baize S, Pannetier D, Faure C, Marianneau P, Marendat I, Georges-Courbot MC, Deubel V

Link to Pubmed [PMID] – 16621649

Microbes Infect. 2006 Apr;8(5):1194-202

Lassa fever is a hemorrhagic fever caused by Lassa virus (LV), which primarily targets human dendritic cells (DC) and macrophages (MP). Massive numbers of viral particles are released with no effect on the viability, activation or maturation of these cells. LV does not inhibit the activation of cells induced by sCD40L or LPS. We report here the consequences of exogenous activation of LV-infected human DC and MP for viral replication. The activation of cells with lipopolysaccharide or exogenous poly(I-C) and the transfection of cells with poly(I-C) strongly inhibited LV replication, at least partly by inducing type I interferon (IFN) synthesis. In contrast, cell stimulation with sCD40L did not induce type I IFN responses or inhibit LV release. Recombinant type I IFNs strongly inhibited LV replication in both cell types, whereas IFNgamma and IFNlambda did not. The modest type I IFN production observed in LV-infected MP, but not in DC, was involved in controlling LV replication in MP. These results provide an explanation for the slower replication of LV in MP than in DC, and suggest that type I IFNs are crucial in the control of LV.