title: Role of the chemokine receptors CCR1, CCR2 and CCR4 in the pathogenesis of experimental dengue infection in mice.
abstract: 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-1α 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-γ, and leukocyte activation were attenuated. However, thrombocytopenia, hemoconcentration and systemic TNF-α 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.
authors.affiliation: Immunopharmacology, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Guabiraba
authors.forename: Rafael Elias
authors.initials: RE
authors.lastname: Marques
authors.forename: Anne-Gaëlle
authors.initials: AG
authors.lastname: Besnard
authors.forename: Caio T
authors.initials: CT
authors.lastname: Fagundes
authors.forename: Danielle G
authors.initials: DG
authors.lastname: Souza
authors.forename: Bernhard
authors.initials: B
authors.lastname: Ryffel
authors.forename: Mauro M
authors.initials: MM
authors.lastname: Teixeira
mesh_terms: D000410:Alanine Transaminase / Q000378:metabolism; D000818:Animals; D001219:Aspartate Aminotransferases / Q000378:metabolism; D003715:Dengue / Q000378:metabolism*; D003716:Dengue Virus / Q000378:metabolism*; D007371:Interferon-gamma / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D008024:Ligands; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009195:Peroxidase / Q000378:metabolism; D054389:Receptors, CCR1 / Q000378:metabolism*; D054390:Receptors, CCR2 / Q000378:metabolism*; D054398:Receptors, CCR4 / Q000378:metabolism*
chemical_list: D015850:Interleukin-6; D008024:Ligands; D054389:Receptors, CCR1; D054390:Receptors, CCR2; D054398:Receptors, CCR4; D007371:Interferon-gamma; D009195:Peroxidase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase