| First Author | Dubois S | Year | 2003 |
| Journal | Proc Natl Acad Sci U S A | Volume | 100 |
| Issue | 24 | Pages | 14169-74 |
| PubMed ID | 14605212 | Mgi Jnum | J:86699 |
| Mgi Id | MGI:2681350 | Doi | 10.1073/pnas.2335979100 |
| Citation | Dubois S, et al. (2003) Distinct pathways involving the FK506-binding proteins 12 and 12.6 underlie IL-2-versus IL-15-mediated proliferation of T cells. Proc Natl Acad Sci U S A 100(24):14169-74 |
| abstractText | 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. |
