title: Negative regulation of T cell proliferation and interleukin 2 production by the serine threonine kinase GSK-3.
abstract: Glycogen synthase kinase (GSK)-3 is a protein serine/threonine kinase that regulates differentiation and cell fate in a variety of organisms. This study examined the role of GSK-3 in antigen-specific T cell responses. Using resting T cells from P14 T cell receptor (TCR)-transgenic mice (specific for the lymphocytic choriomeningitis virus and H-2D(b)), we demonstrated that GSK-3beta was inactivated by serine phosphorylation after viral peptide-specific stimulation in vitro. To further investigate the role of GSK-3, we have generated a retroviral vector that expresses a constitutively active form of GSK-3beta that has an alanine substitution at the regulatory amino acid, serine 9 (GSK-3betaA9). Retroviral transduction of P14 TCR-transgenic bone marrow stem cells, followed by reconstitution, led to the expression of GSK-3betaA9 in bone marrow chimeric mice. T cells from chimeric mice demonstrate a reduction in proliferation and interleukin (IL)-2 production. In contrast, in vitro assays done in the presence of the GSK-3 inhibitor lithium led to dramatically prolonged T cell proliferation and increased IL-2 production. Furthermore, in the presence of lithium, we show that nuclear factor of activated T cells (NF-AT)c remains in the nucleus after antigen-specific stimulation of T cells. Together, these data demonstrate that GSK-3 negatively regulates the duration of T cell responses.
authors.affiliation: Ontario Cancer Institute, Department of Medical Biophysics, Toronto, Ontario M5G 2M9, Canada.
authors.forename: T
authors.initials: T
authors.lastname: Ohteki
authors.forename: M
authors.initials: M
authors.lastname: Parsons
authors.forename: A
authors.initials: A
authors.lastname: Zakarian
authors.forename: R G
authors.initials: RG
authors.lastname: Jones
authors.forename: L T
authors.initials: LT
authors.lastname: Nguyen
authors.forename: J R
authors.initials: JR
authors.lastname: Woodgett
authors.forename: P S
authors.initials: PS
authors.lastname: Ohashi
mesh_terms: D016475:3T3 Cells; D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology; D001854:Bone Marrow Cells / Q000166:cytology / Q000276:immunology; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D038362:Glycogen Synthase Kinase 3; D038341:Glycogen Synthase Kinases; D007376:Interleukin-2 / Q000096:biosynthesis*; D008213:Lymphocyte Activation / Q000276:immunology*; D008217:Lymphocytic choriomeningitis virus / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics / Q000276:immunology*; D011994:Recombinant Proteins / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014162:Transfection
chemical_list: D007376:Interleukin-2; D016693:Receptors, Antigen, T-Cell, alpha-beta; D011994:Recombinant Proteins; D038341:Glycogen Synthase Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D038362:Glycogen Synthase Kinase 3