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Until recently, adaptive immunity and cytotoxic T cells were considered as the only essential components of the antiviral defence arsenal. Additional data that do not rule out the crucial role of these cells in the clearance of viral pathogens have, however, recently emerged. They indicate that innate immune cells such as macrophages, dendritic cells, gammadelta T cells as well as natural killer (NK) cells play a primordial role in this mechanism. It is now well established that innate immune cells can detect various pathogens (bacteria, viruses, fungi or parasites) very rapidly and respond to their presence through the activation of specific receptors. Once activated, these molecules trigger several signalling cascades that culminate in the establishment of very potent defence mechanisms. In addition, cytokines produced during this initial response are essential for the activation of the adaptive immune response which will add specificity and memory to the system. Among the innate immune receptors, attention has focused on the Toll-like receptors (TLR) and many reports indicate that some of the TLRs are clearly involved in defence against viral pathogens. However, new molecules, acting independently from any TLR, have recently been discovered. They define a second antiviral pathway which is presently the subject of intense research. In this article, we will review the role of the different molecules involved in each pathway within the framework of innate antiviral defence.

Immunité innée antivirale : Rôle des mécanismesToll-dépendants etToll-indépendants