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Interleukin 15: Its Role in Inflammation and Immunity

  • Liyanage P. Perera
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Abstract

Interleukin 15 (IL-15) is a 14–15 kDa polypeptide that belongs to the 4 α-helix-bundle family of cytokines and was originally discovered due to its T cell proliferative activity. It utilizes the signal-transducing β/γ polypeptides of the IL-2 receptor complex, thus sharing many biological activities with IL-2, in addition to its high-affinity private receptor subunit IL-15Rα. Accumulating evidence indicates that the biological relevance of IL-15 may not solely be confined to T lymphocytes, but to a variety of cell populations within the immune system as well as outside the immune system of the host. The expression of both IL-15 and its high-affinity receptor component, IL-15Rα, are readily demonstrable in a wide variety of tissues and appear to be augmented in response to environmental/stress stimuli and infectious agents. There is increasing evidence to suggest that IL-15 may play an important role in protective immune responses, allograft rejection and the pathogenesis of autoimmune diseases, where mononuclear cell infiltration is a hallmark feature. Herein, the effects of IL-15 on cells associated with host defense, immunity and inflammation are reviewed and support a central role for this cytokine in orchestrating multiple aspects of effector functions in immunity and inflammation.

Key words

interleukin 15 natural killer cells monocytes dendritic cells. 

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© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • Liyanage P. Perera
    • 1
  1. 1.Metabolism Branch, Division of Clinical SciencesNational Cancer InstituteBethesdaUSA

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