Cellular Immune Activation in Children with Acute Dengue Virus Infections Is Modulated by Apoptosis
1Department of Virology, Armed Forces Research Institute of Medical Sciences, and 2Department of Pediatrics, Queen Sirikit National Institute of Child Health, Bangkok, Thailand; 3Department of Virus Diseases, Walter Reed Army Institute of Research, Silver Spring, Maryland; 4Center for Infectious Disease and Vaccine Research, University of Massachusetts Medical School, Worcester, Massachusetts
Apoptosis is an important modulator of cellular immune responses during systemic viral infections. Peripheral‐blood mononuclear cell (PBMC) apoptosis and plasma soluble levels of CD95, a mediator of apoptosis, were determined in sequential samples from children participating in a prospective study of dengue virus (DV) infections. During the period of defervescence, levels of PBMC apoptosis were higher in children developing dengue hemorrhagic fever (DHF), the most severe form of illness, than in those with dengue fever (DF) and other, nondengue, febrile illnesses. CD8+ T lymphocytes made up approximately half of the peak circulating apoptotic PBMCs in DHF and DF. Maximum plasma levels of soluble CD95 were also higher in children with DHF than in those with DF. The level of PBMC apoptosis correlated with dengue disease severity. Apoptosis appears to be involved in modulation of the innate and adaptive immune responses to DV infection and is likely involved in the evolution of immune responses in other viral hemorrhagic fevers.
Received 11 January 2006; accepted 24 April 2006; electronically published 31 July 2006.
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Online publication date: 3-Jul-2008.
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Online publication date: 15-Apr-2007.
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Potential conflicts of interest: none reported.
Financial support: National Institutes of Health (grant NIH‐P01AI34533); US Army Medical Research and Materiel Command.
The contents of this article are solely the responsibility of the authors and do not necessarily represent the official views of the National Institutes of Health or the Department of Defense.
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Present affiliations: Division of Communicable Diseases and Immunology, Walter Reed Army Institute of Research, Silver Spring, Maryland (T.P.E.); Military Infectious Diseases Research Program, US Army Medical Research and Materiel Command, Fort Detrick, Maryland (D.W.V.).





