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Originally published online as doi:10.1189/jlb.0208105 on July 23, 2008

Published online before print July 23, 2008
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(Journal of Leukocyte Biology. 2008;84:1028-1038.)
© 2008 by Society for Leukocyte Biology

Viral replication and paracrine effects result in distinct, functional responses of dendritic cells following infection with dengue 2 virus

Zachary D. Nightingale, Chinmay Patkar and Alan L. Rothman1

Center for Infectious Disease and Vaccine Research, University of Massachusetts Medical School, Worcester, Massachusetts, USA

1 Correspondence: CIDVR, Rm. S6-862, University of Massachusetts Medical School, 55 Lake Avenue, North, Worcester, MA 01655, USA. E-mail: alan.rothman{at}umassmed.edu

ABSTRACT

Dengue virus (DENV), a re-emerging arbovirus, readily infects dendritic cells (DC) in culture and in vivo. However, there have been contradictory reports regarding the effect of DENV infection on DC activation and maturation. DC undergo a series of functional changes following exposure to infectious agents, including cytokine production and costimulatory and MHC molecule induction, culminating in stimulation of adaptive immune responses. Immunological memory to primary DENV infection critically influences disease severity during subsequent infections with heterologous serotypes. To explore these phenomena, we examined DENV infection-dependent and -independent effects on DC secretory, phenotypic, and allostimulatory functions. DENV infection of DC resulted in the secretion of a broad array of cytokines and chemokines. Type I IFN produced by DC inhibited propagation of infection and induced the chemokine IFN-{gamma}-inducible protein 10 (IP-10; CXCL10). Based on intracellular cytokine staining, infected DC produced less IP-10 but more TNF-{alpha} than uninfected bystander cells in the same culture. DENV exposure activated surface molecule expression on infected and bystander cells; infected DC had enhanced programmed death ligand 2 (PD-L2) and MHC II expression but reduced levels of PD-L1, CD80, CD86, and MHC I relative to bystander DC. Dengue-infected DC cultures stimulated resting allogeneic CD4 T cell proliferation, although an increasing multiplicity of infection was associated with decreasing stimulatory capacity of DC. These data demonstrate that functional maturation of DC in response to dengue infection is modified by the presence of virus through IFN-dependent and -independent mechanisms with consequences for the development of adaptive immunity.

Key Words: flavivirus • IFN-{alpha} • IP-10 • PD-L1 • T-lymphocyte