title: Involvement of IL-2 in homeostasis of regulatory T cells: the IL-2 cycle.
abstract: A large body of evidence on the activity of regulatory T (Treg) cells was gathered during the last decade, and a similar number of reviews and opinion papers attempted to integrate the experimental findings. The abundant literature clearly delineates an exciting area of research but also underlines some major controversies. A linear cause-result interpretation of experimental maneuvers often ignores the fact that the activity of Treg cells is orchestrated with the effector T (Teff) cells within an intricate network of physiological immune homeostasis. Every modulation of the activity of the effector (cytotoxic) immune system revolves to affect the activity of regulatory (suppressive) cells through elaborate feedback loops of negative and positive regulation. The lack of IL-2 production by innate Treg cells makes this cytokine a prime coupler of the effector and suppressive mechanisms. Here we attempt to integrate evidence that delineates the involvement of IL-2 in primary and secondary feedback loops that regulate the activity of suppressive cells within the elaborate network of physiological immune homeostasis.
authors.affiliation: Target-In Ltd, Petach Tikva, Israel.
authors.forename: Shai
authors.initials: S
authors.lastname: Yarkoni
authors.forename: Ayelet
authors.initials: A
authors.lastname: Kaminitz
authors.forename: Yuval
authors.initials: Y
authors.lastname: Sagiv
authors.forename: Isaac
authors.initials: I
authors.lastname: Yaniv
authors.forename: Nadir
authors.initials: N
authors.lastname: Askenasy
mesh_terms: D000818:Animals; D006706:Homeostasis / Q000276:immunology*; D006801:Humans; D016753:Interleukin-10 / Q000276:immunology; D007376:Interleukin-2 / Q000276:immunology*; D053645:Interleukin-2 Receptor alpha Subunit / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D008822:Mice, Transgenic; D018448:Models, Immunological; D015375:Receptors, Interleukin-2 / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D016212:Transforming Growth Factor beta / Q000276:immunology
chemical_list: D007376:Interleukin-2; D053645:Interleukin-2 Receptor alpha Subunit; D015375:Receptors, Interleukin-2; D016212:Transforming Growth Factor beta; D016753:Interleukin-10