The interleukin-15/interleukin-15 receptor system as a model for juxtacrine and reverse signaling



This article is corrected by:

  1. Errata: Expression of concern Volume 33, Issue 8, 647, Article first published online: 19 July 2011


Interleukin-15 (IL-15) is a pleiotropic cytokine of the 4 α-helix bundle family, which binds to a receptor complex that displays common elements with the IL-2 receptor and a unique high-affinity α chain. This review focuses on juxtacrine and reverse signaling levels in the IL-15/IL-15R system. Specifically, we discuss how agonistic stimulation of membrane-bound IL-15 induces phosphorylation of members of the MAP kinase family and of focal adhesion kinase (FAK), thereby upregulating processes including cytokine secretion, cell adhesion and migration. In addition, we explore IL-15 trans-presentation and intracellular signaling, and define promising molecular targets for future pharmacological intervention in infectious diseases and immunological disorders. These frontiers in IL-15/IL-15Rα research serve as highly instructive examples for key concepts, unsolved problems and therapeutic opportunities in juxtacrine and reverse signaling in general. BioEssays 28: 362–377, 2006. © 2006 Wiley Periodicals, Inc.