Cutting Edge: Human 2B4, an Activating NK Cell Receptor, Recruits the Protein Tyrosine Phosphatase SHP-2 and the Adaptor Signaling Protein SAP
1999; American Association of Immunologists; Volume: 162; Issue: 12 Linguagem: Inglês
10.4049/jimmunol.162.12.6981
ISSN1550-6606
AutoresStuart G. Tangye, Sasha Lazetic, Erica Woollatt, Grant R. Sutherland, Lewis L. Lanier, Joseph H. Phillips,
Tópico(s)Galectins and Cancer Biology
ResumoThe genetic defect in X-linked lymphoproliferative syndrome (XLP) is the Src homology 2 domain-containing protein SAP. SAP constitutively associates with the cell surface molecule, signaling lymphocytic activation molecule (SLAM), and competes with SH2-domain containing protein tyrosine phosphatase-2 (SHP-2) for recruitment to SLAM. SLAM exhibits homology with the mouse cell surface receptor 2B4. The human homologue of 2B4 has now been identified. It is recognized by the c1.7 mAb, a mAb capable of activating human NK cells. Human 2B4 became tyrosine phosphorylated following pervanadate-treatment of transfected cells and recruited SHP-2. SAP was also recruited to 2B4 in activated cells. Importantly, the 2B4-SAP interaction prevented the association between 2B4 and SHP-2. These results suggest that the phenotype of XLP may result from perturbed signaling not only through SLAM, but also other cell surface molecules that utilize SAP as a signaling adaptor protein.
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