title: Receptor-stimulated oxidation of SHP-2 promotes T-cell adhesion through SLP-76-ADAP.
abstract: Receptor-stimulated generation of intracellular reactive oxygen species (ROS) modulates signal transduction, although the mechanism(s) is unclear. One potential basis is the reversible oxidation of the active site cysteine of protein tyrosine phosphatases (PTPs). Here, we show that activation of the antigen receptor of T cells (TCR), which induces production of ROS, induces transient inactivation of the SH2 domain-containing PTP, SHP-2, but not the homologous SHP-1. SHP-2 is recruited to the LAT-Gads-SLP-76 complex and directly regulates the phosphorylation of key signaling proteins Vav1 and ADAP. Furthermore, the association of ADAP with the adapter SLP-76 is regulated by SHP-2 in a redox-dependent manner. The data indicate that TCR-mediated ROS generation leads to SHP-2 oxidation, which promotes T-cell adhesion through effects on an SLP-76-dependent signaling pathway to integrin activation.
authors.affiliation: Department of Microbiology and Immunology, University of Maryland School of Medicine, Rockville, MD 20855, USA.
authors.forename: Jaeyul
authors.initials: J
authors.lastname: Kwon
authors.forename: Cheng-Kui
authors.initials: CK
authors.lastname: Qu
authors.forename: Jin-Soo
authors.initials: JS
authors.lastname: Maeng
authors.forename: Rustom
authors.initials: R
authors.lastname: Falahati
authors.forename: Chunghee
authors.initials: C
authors.lastname: Lee
authors.forename: Mark S
authors.initials: MS
authors.lastname: Williams
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism*; D001665:Binding Sites; D002448:Cell Adhesion; D018797:Cell Cycle Proteins / Q000378:metabolism; D003545:Cysteine / Q000378:metabolism; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D019169:Jurkat Cells; D010084:Oxidation-Reduction; D010750:Phosphoproteins / Q000378:metabolism*; D010766:Phosphorylation; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D051567:Proto-Oncogene Proteins c-vav; D017382:Reactive Oxygen Species / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000819:agonists / Q000502:physiology*; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D015398:Signal Transduction; D013601:T-Lymphocytes / Q000502:physiology*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D018797:Cell Cycle Proteins; C106957:FYB1 protein, human; D047908:Intracellular Signaling Peptides and Proteins; D010750:Phosphoproteins; D011518:Proto-Oncogene Proteins; D051567:Proto-Oncogene Proteins c-vav; D017382:Reactive Oxygen Species; D011948:Receptors, Antigen, T-Cell; C092947:SLP-76 signal Transducing adaptor proteins; C496618:VAV1 protein, human; C516724:PTPN11 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D017027:Protein Tyrosine Phosphatases; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D003545:Cysteine