NDLI: Distinct pathways involving the FK506-binding proteins 12 and 12.6 underlie IL-2-versus IL-15-mediated proliferation of T cells

Content Provider	PubMed Central
Author	Dubois, Sigrid Shou, Weinian Haneline, Laura S. Fleischer, Sidney Waldmann, Thomas A. Müller, Jürgen R.
Copyright Year	2003
Abstract	The molecular basis for the different roles of IL-2 and IL-15 in lymphocyte function has been poorly defined. Searching for differences that underlie the distinct T cell responses to the two cytokines, we observed a marked susceptibility of the IL-15-induced but not of the IL-2-induced proliferation to rapamycin despite a decrease of p70S6 kinase (p70S6K) activation by the drug in response to both cytokines. Activated splenic T lymphocytes deficient in the FK506-binding protein (FKBP) 12, a target of rapamycin activity, had reduced proliferation in response to IL-15 but not to IL-2. This decreased proliferation was accompanied by reduced activation of p70S6K and of the extracellular signal-regulated kinases (ERK) after IL-15 treatment. In contrast to FKBP12 –/– cells, splenic FKBP12.6 –/– T cells exhibited a decreased proliferative response to IL-2 in the presence of rapamycin without affecting p70S6K or ERK activation. Thus, IL-15 induces T cell proliferation mainly via FKBP12-mediated p70S6K activation. In contrast, IL-2 signaling involves multiple pathways that include at least one additional pathway that depends on FKBP12.6.
Related Links	http://dx.doi.org/10.1073/pnas.2335979100
Ending Page	14174
Page Count	6
Starting Page	14169
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	24
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-11-25
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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