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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/09/813/11 $2.00
Volume 186, Number 6, September 15, 1997 813-823

Measles Virus Suppresses Cell-mediated Immunity by Interfering with the Survival and Functions of Dendritic and T Cells

By Isabelle Fugier-Vivier,* Christine Servet-Delprat,Dagger Pierre Rivailler,Dagger Marie-Clotilde Rissoan,* Yong-Jun Liu,* and Chantal Rabourdin-CombeDagger

From the * Laboratory for Immunological Research, Schering-Plough, Dardilly, France; and Dagger  Immunobiologie Moléculaire, Laboratoire de Biologie Cellulaire et Moléculaire de l'Ecole Normale Supérieure de Lyon, Lyon, France

Secondary infections due to a marked immunosuppression have long been recognized as a major cause of the high morbidity and mortality rate associated with acute measles. The mechanisms underlying the inhibition of cell-mediated immunity are not clearly understood but dysfunctions of monocytes as antigen-presenting cells (APC) are implicated. In this report, we demonstrate that measles virus (MV) replicates weakly in the resting dendritic cells (DC) as in lipopolysaccharide-activated monocytes, but intensively in CD40-activated DC. The interaction of MV-infected DC with T cells not only induces syncytia formation where MV undergoes massive replication, but also leads to an impairment of DC and T cell function and cell death. CD40-activated DC decrease their capacity to produce interleukin (IL) 12, and T cells are unable to proliferate in response to MV-infected DC stimulation. A massive apoptosis of both DC and T cells is observed in the MV pulsed DC-T cell cocultures. This study suggests that DC represent a major target of MV. The enhanced MV replication during DC-T cell interaction, leading to an IL-12 production decrease and the deletion of DC and T cells, may be the essential mechanism of immunosuppression induced by MV.


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