title: T cell proliferation in response to interleukins 2 and 7 requires p38MAP kinase activation.
abstract: Interleukin-2 (IL-2) is a potent T cell mitogen. However, the signaling pathways by which IL-2 mediates its mitogenic effect are not fully understood. One of the members of the mitogen-activated protein kinase (MAPK) family, p42/44MAPK (ERK2/1), is known to be activated by IL-2. We have now investigated the response to IL-2 of two other members of the MAP kinase family, p54MAP kinase (stress-activated protein kinase (SAPK)/Jun-N-terminal kinase (JNK)) and p38MAP kinase (p38/Mpk2/CSBP/RK), which respond primarily to stressful and inflammatory stimuli (e.g. tumor necrosis factor-alpha, IL-1, and lipopolysaccharide). Here we show that IL-2, and another T cell growth factor, IL-7, activate both SAPK/JNK and p38MAP kinase. Furthermore, inhibition of p38MAP kinase activity with a specific pyrinidyl imidazole inhibitor SB203580 that prevents activation of its downstream effector, MAPK-activating protein kinase-2, correlated with suppression of IL-2- and IL-7-driven T cell proliferation. These data indicate that in T cells p38MAP kinase has a role in transducing the mitogenic signal.
authors.affiliation: The Kennedy Institute of Rheumatology, 1 Aspenlea Road, Hammersmith, London W6 8LH, United Kingdom.
authors.forename: J B
authors.initials: JB
authors.lastname: Crawley
authors.forename: L
authors.initials: L
authors.lastname: Rawlinson
authors.forename: F V
authors.initials: FV
authors.lastname: Lali
authors.forename: T H
authors.initials: TH
authors.lastname: Page
authors.forename: J
authors.initials: J
authors.lastname: Saklatvala
authors.forename: B M
authors.initials: BM
authors.lastname: Foxwell
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000737:chemistry / Q000378:metabolism*; D002460:Cell Line; D004789:Enzyme Activation; D004790:Enzyme Induction; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007093:Imidazoles / Q000494:pharmacology; D007376:Interleukin-2 / Q000494:pharmacology*; D015851:Interleukin-7 / Q000494:pharmacology*; D047908:Intracellular Signaling Peptides and Proteins; D048031:JNK Mitogen-Activated Protein Kinases; D008213:Lymphocyte Activation / Q000187:drug effects*; D048670:MAP Kinase Kinase 4; D051379:Mice; D020929:Mitogen-Activated Protein Kinase Kinases; D020928:Mitogen-Activated Protein Kinases; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry / Q000276:immunology; D011494:Protein Kinases / Q000737:chemistry / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000096:biosynthesis; D011725:Pyridines / Q000494:pharmacology; D013601:T-Lymphocytes / Q000187:drug effects / Q000201:enzymology / Q000276:immunology*; D048051:p38 Mitogen-Activated Protein Kinases; D000099190:MAP-Kinase-Activated Kinase 2
chemical_list: D000906:Antibodies; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D004791:Enzyme Inhibitors; D007093:Imidazoles; D007376:Interleukin-2; D015851:Interleukin-7; D047908:Intracellular Signaling Peptides and Proteins; D048031:JNK Mitogen-Activated Protein Kinases; D048670:MAP Kinase Kinase 4; D020929:Mitogen-Activated Protein Kinase Kinases; D020928:Mitogen-Activated Protein Kinases; D010446:Peptide Fragments; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D011725:Pyridines; D048051:p38 Mitogen-Activated Protein Kinases; D000099190:MAP-Kinase-Activated Kinase 2; C482562:Map2k4 protein, mouse; C093642:SB 203580