Role of the chemokine receptors CCR1, CCR2 and CCR4 in the pathogenesis of experimental dengue infection in mice
2010
Guabiraba , Rodrigo (INRA (France). UR 1282 Infectiologie Animale et Santé Publique) | Marques , Rafael Elias (Universidade Federal de Minas Gerais, Belo Horizonte(Brésil). Instituto de Ciencias Biologicas - Departamento de Bioquimica e Imunologia - Immunopharmacology) | Besnard , Anne-Gaëlle (Centre National de la Recherche Scientifique, Orléans(France). UMR 6218 Molecular Immunology and Embryology) | Fagundes , Caio T. (Universidade Federal de Minas Gerais, Belo Horizonte(Brésil). Instituto de Ciencias Biologicas - Departamento de Bioquimica e Imunologia - Immunopharmacology) | Souza , Danielle G. (Universidade Federal de Minas Gerais, Belo Horizonte(Brésil). Instituto de Ciencias Biologicas - Departamento de Microbiologia) | Ryffel , Bernhard (Centre National de la Recherche Scientifique, Orléans(France). UMR 6218 Molecular Immunology and Embryology) | Teixeira , Mauro M.(auteur de correspondance) (Universidade Federal de Minas Gerais, Belo Horizonte(Brésil). Instituto de Ciencias Biologicas - Departamento de Bioquimica e Imunologia - Immunopharmacology)
Dengue virus (DENV), a mosquito-borne flavivirus, is a public health problem in many tropical countries. Recent clinical data have shown an association between levels of different chemokines in plasma and severity of dengue. We evaluated the role of CC chemokine receptors CCR1, CCR2 and CCR4 in an experimental model of DENV-2 infection in mice. Infection of mice induced evident clinical disease and tissue damage, including thrombocytopenia, hemoconcentration, lymphopenia, increased levels of transaminases and pro-inflammatory cytokines, and lethality in WT mice. Importantly, infected WT mice presented increased levels of chemokines CCL2/JE, CCL3/MIP-1alpha and CCL5/RANTES in spleen and liver. CCR1(-)/(-) mice had a mild phenotype with disease presentation and lethality similar to those of WT mice. In CCR2(-)/(-) mice, lethality, liver damage, levels of IL-6 and IFN-gamma, and leukocyte activation were attenuated. However, thrombocytopenia, hemoconcentration and systemic TNF-alpha levels were similar to infected WT mice. Infection enhanced levels of CCL17/TARC, a CCR4 ligand. In CCR4(-)/(-) mice, lethality, tissue injury and systemic inflammation were markedly decreased. Despite differences in disease presentation in CCR-deficient mice, there was no significant difference in viral load. In conclusion, activation of chemokine receptors has discrete roles in the pathogenesis of dengue infection. These studies suggest that the chemokine storm that follows severe primary dengue infection associates mostly to development of disease rather than protection.
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