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      IL-15 increases the percentage of effector memory CD8 + T cells in rhesus monkeys immunized with HIV vaccine

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          Abstract

          Several studies suggested that interleukin (IL)-15 is a promising adjuvant of human immunodeficiency virus (HIV) vaccine via promoting cellular immunity. Here we evaluated the effect of IL-15 plasmid on HIV specific immune response, especially cellular immunity, in 8 rhesus monkeys. These monkeys were immunized three times with HIV DNA vaccine with or without IL-15 plasmid, and boosted with recombinant Tiantan strain vaccinia virus-based HIV vaccine (rTV) 22 weeks after the first immunization. As the results, the percentages of effector CD8 + memory T cells in the peripheral blood were significantly higher in the group with IL-15 co-immunization (Group T) than those in the group with HIV vaccine alone (Group C) at almost all the time points, while no significant difference in HIV specific CD8 + T cells response was found between Group T and Group C throughout the experiment. The titers of anti-HIV antibodies were higher in Group T than those in Group C after rTV boosting as well. These findings in rhesus monkeys suggest that IL-15 may be used as a cytokine adjuvant for HIV vaccine.

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          Most cited references16

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          Cytokine control of memory T-cell development and survival.

          Evidence has accumulated that cytokines have a fundamental role in the differentiation of memory T cells. Here, we follow the CD8+ T cell from initial activation to memory-cell generation, indicating the checkpoints at which cytokines determine the fate of the T cell. Members of the common cytokine-receptor gamma-chain (gammac)-cytokine family--in particular, interleukin-7 (IL-7) and IL-15--act at each stage of the immune response to promote proliferation and survival. In this manner, a stable and protective, long-lived memory CD8+ T-cell pool can be propagated and maintained.
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            Diverse functions of IL-2, IL-15, and IL-7 in lymphoid homeostasis.

            IL-2, IL-15, and IL-7 are cytokines that are critical for regulating lymphoid homeostasis. These cytokines stimulate similar responses from lymphocytes in vitro, but play markedly divergent roles in lymphoid biology in vivo. Their distinct physiological functions can be ascribed to distinct signaling pathways initiated by proprietary cytokine receptor chains, differential expression patterns of the cytokines or their receptor chains, and/or signals occurring in distinct physiological contexts. Recently, the discovery of a novel mechanism of cytokine signaling, trans-presentation, has provided further insights into the different ways these cytokines function. Trans-presentation also raises several novel cell biological and cellular implications concerning how cytokines support lymphoid homeostasis.
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              Safety and immunologic effects of IL-15 administration in nonhuman primates.

              The administration of cytokines that modulate endogenous or transferred T-cell immunity could improve current approaches to clinical immunotherapy. Interleukin-2 (IL-2) is used most commonly for this purpose, but causes systemic toxicity and preferentially drives the expansion of CD4(+)CD25(+)Foxp3(+) regulatory T cells, which can inhibit antitumor immunity. IL-15 belongs to the gamma(c) cytokine family and possesses similar properties to IL-2, including the ability to induce T-cell proliferation. Whereas IL-2 promotes apoptosis and limits the survival of CD8(+) memory T cells, IL-15 is required for the establishment and maintenance of CD8(+) T-cell memory. However, limited data are available to guide the clinical use of IL-15. Here, we demonstrate in nonhuman primates that IL-15 administration expands memory CD8(+) and CD4(+) T cells, and natural killer (NK) cells in the peripheral blood, with minimal increases in CD4(+)CD25(+)Foxp3(+) regulatory T cells. Daily administration of IL-15 resulted in persistently elevated plasma IL-15 levels and transient toxicity. Intermittent administration of IL-15 allowed clearance of IL-15 between doses and was safe for more than 3 weeks. These findings demonstrate that IL-15 has profound immunomodulatory properties distinct from those described for IL-2, and suggest that intermittent administration of IL-15 should be considered in clinical studies.
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                Author and article information

                Contributors
                Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing 100005, China
                National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China
                National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China
                Division of Virology and Immunology, National Center for AIDS/STD Control and prevention, Chinese Center for Disease Control and Prevention, Beijing 100050, China
                Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, National Key Laboratory of Medical Molecular Biology, Beijing 100005, China
                National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China
                Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, National Key Laboratory of Medical Molecular Biology, Beijing 100005, China
                Journal
                101242872
                32590
                Cell Mol Immunol
                Cellular & Molecular Immunology
                1672-7681
                2042-0226
                15 July 2010
                27 September 2010
                November 2010
                18 June 2012
                : 7
                : 6
                : 491-494
                Affiliations
                Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, Beijing 100005, China
                National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China
                National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China
                Division of Virology and Immunology, National Center for AIDS/STD Control and prevention, Chinese Center for Disease Control and Prevention, Beijing 100050, China
                Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, National Key Laboratory of Medical Molecular Biology, Beijing 100005, China
                National Institute for Viral Disease Control and Prevention, China CDC, Beijing 100052, China
                Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, National Key Laboratory of Medical Molecular Biology, Beijing 100005, China
                Author notes
                Corresponding author: Wei He, Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, National Key Laboratory of Medical Molecular Biology, 5 Dong Dan San Tiao, Beijing 100005, China, Tel: 86-10-65136981; Fax: 86-10-65105909; heweiimu@ 123456public.bta.net.cn
                Article
                NIHMS220070
                10.1038/cmi.2010.44
                3376407
                20871629
                b9b3f48e-7018-406f-86b9-c39482eed34f
                History
                Funding
                Funded by: National Institute of Allergy and Infectious Diseases Extramural Activities : NIAID
                Award ID: U19 AI051915-05 ||AI
                Categories
                Article

                Immunology
                adjuvant,il-15,effector memory cd8+ t cell,hiv vaccine
                Immunology
                adjuvant, il-15, effector memory cd8+ t cell, hiv vaccine

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