References
Query Results -- Details
MGI Accession ID: MGI:2388796
J Number: J:79702
Other Accession IDs:
Title: Lymphoproliferative defects in mice lacking the expression of neurofibromin: functional and biochemical consequences of Nf1 deficiency in T-cell development and function.
Authors: Ingram DA; Zhang L; McCarthy J; Wenning MJ; Fisher L; Yang FC; Clapp DW; Kapur R
Journal: Blood
Volume: 100
Issue: 10
Date: 2002 Nov 15
Year: 2002
Pages: 3656-62
Review Status: Peer Reviewed
Abstract:
Ras plays an essential role in lymphocyte development and function. However, in vivo consequence(s) of regulation of Ras activity by guanosine triphosphatase (GTPase)-activating proteins (GAPs) on lymphocyte development and function are not known. In this study we demonstrate that neurofibromin, the protein encoded by the NF1 tumor suppressor gene functions as a GAP for Ras in T cells. Loss of Nf1 in T cells results in enhanced Ras activation, which is associated with thymic and splenic hyperplasia, and an increase in the absolute number of immature and mature T-cell subsets compared with control mice. Interestingly, in spite of a profound T-cell expansion and higher thymidine incorporation in unstimulated Nf1-deficient T cells, T-cell receptor and interleukin-2 receptor-mediated proliferation of thymocytes and mature T cells was substantially reduced compared with control mice. Collectively, these results identify neurofibromin as a GAP for Ras in T cells for maintaining immune homeostasis in vivo.
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