title: In vivo significance of ITK-SLP-76 interaction in cytokine production.
abstract: In vitro data have suggested that activation of the inducible T-cell kinase (ITK) requires an interaction with the adaptor protein SLP-76. One means for this interaction involves binding of the ITK SH3 domain to the polyproline-rich (PR) region of SLP-76. However, the biological significance of this association in live cells and the consequences of its disruption have not been demonstrated. Here, we utilized a polyarginine-rich, cell-permeable peptide that represents the portion of the SLP-76 PR region that interacts with the ITK SH3 domain as a competitive inhibitor to disrupt the association between ITK and SLP-76 in live cells. We demonstrate that treatment of cells with this peptide, by either in vitro incubation or intraperitoneal injection of the peptide in mice, inhibits the T-cell receptor (TCR)-induced association between ITK and SLP-76, recruitment and transphosphorylation of ITK, actin polarization at the T-cell contact site, and expression of Th2 cytokines. The inhibition is specific, as indicated by lack of effects by the polyarginine vehicle alone or a scrambled sequence of the cargo peptide. In view of the role of ITK as a regulator of Th2 cytokine expression, the data underscore the significance of ITK as a target for pharmacological intervention.
authors.affiliation: Department of Biology, San Diego State University, San Diego, CA 92182-4614, USA.
authors.forename: Juris A
authors.initials: JA
authors.lastname: Grasis
authors.forename: David M
authors.initials: DM
authors.lastname: Guimond
authors.forename: Nicholas R
authors.initials: NR
authors.lastname: Cam
authors.forename: Krystal
authors.initials: K
authors.lastname: Herman
authors.forename: Paola
authors.initials: P
authors.lastname: Magotti
authors.forename: John D
authors.initials: JD
authors.lastname: Lambris
authors.forename: Constantine D
authors.initials: CD
authors.lastname: Tsoukas
mesh_terms: D000199:Actins / Q000378:metabolism; D048868:Adaptor Proteins, Signal Transducing / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D001667:Binding, Competitive; D016207:Cytokines / Q000096:biosynthesis*; D006801:Humans; D019169:Jurkat Cells; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism; D010750:Phosphoproteins / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*; D054730:Protein Interaction Domains and Motifs; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011948:Receptors, Antigen, T-Cell / Q000378:metabolism; D015398:Signal Transduction; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism
chemical_list: D000199:Actins; D048868:Adaptor Proteins, Signal Transducing; D016207:Cytokines; D010446:Peptide Fragments; D010750:Phosphoproteins; D011948:Receptors, Antigen, T-Cell; C092947:SLP-76 signal Transducing adaptor proteins; D011505:Protein-Tyrosine Kinases; C080813:emt protein-tyrosine kinase
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