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  • 1
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    Defective thymocyte maturation in p44 MAP kinase (Erk 1) knockout mice (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-13
    Description: The p42 and p44 mitogen-activated protein kinases (MAPKs), also called Erk2 and Erk1, respectively, have been implicated in proliferation as well as in differentiation programs. The specific role of the p44 MAPK isoform in the whole animal was evaluated by generation of p44 MAPK-deficient mice by homologous recombination in embryonic stem cells. The p44 MAPK-/- mice were viable, fertile, and of normal size. Thus, p44 MAPK is apparently dispensable and p42 MAPK (Erk2) may compensate for its loss. However, in p44 MAPK-/- mice, thymocyte maturation beyond the CD4+CD8+ stage was reduced by half, with a similar diminution in the thymocyte subpopulation expressing high levels of T cell receptor (CD3high). In p44 MAPK-/- thymocytes, proliferation in response to activation with a monoclonal antibody to the T cell receptor in the presence of phorbol myristate acetate was severely reduced even though activation of p42 MAPK was more sustained in these cells. The p44 MAPK apparently has a specific role in thymocyte development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pages, G -- Guerin, S -- Grall, D -- Bonino, F -- Smith, A -- Anjuere, F -- Auberger, P -- Pouyssegur, J -- New York, N.Y. -- Science. 1999 Nov 12;286(5443):1374-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Centre A. Lacassagne, 33 Avenue de Valombrose, 06189 Nice, France. gpages@unice.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10558995" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Monoclonal ; Antigens, CD/analysis ; Antigens, CD3/immunology ; Cell Differentiation ; Cell Division ; Cells, Cultured ; DNA/biosynthesis ; Enzyme Activation ; Gene Targeting ; Isoenzymes/genetics/metabolism ; Mice ; Mice, Knockout ; Mitogen-Activated Protein Kinase 1/metabolism ; Mitogen-Activated Protein Kinase 3 ; Mitogen-Activated Protein Kinases/deficiency/genetics/*metabolism ; Phosphorylation ; Polymorphism, Restriction Fragment Length ; Receptors, Antigen, T-Cell, alpha-beta/analysis/physiology ; T-Lymphocyte Subsets/*cytology/enzymology/immunology ; Tetradecanoylphorbol Acetate/pharmacology ; Thymus Gland/*cytology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Signal transduction. An arresting start for MAPK (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-02-24
    Description: Exactly how signaling proteins know where they need to be in the cell is one of the intriguing mysteries of signal transduction biology. In a Perspective, Pouyssegur reviews new results that identify b-arrestin 2 as a scaffolding protein that holds together the different components of a MAPK signaling pathway that activates the transcription factor kinase, JNK3.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pouyssegur, J -- New York, N.Y. -- Science. 2000 Nov 24;290(5496):1515-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Signaling, Developmental Biology and Cancer Research, CNRS-UMR 6543, Nice 06189, France. pouysseg@unice.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11185509" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arrestins/*metabolism ; Cell Nucleus/metabolism ; Cells, Cultured ; Cytosol/metabolism ; Endosomes/metabolism ; Enzyme Activation ; JNK Mitogen-Activated Protein Kinases ; MAP Kinase Kinase 7 ; MAP Kinase Kinase Kinase 5 ; MAP Kinase Kinase Kinases/metabolism ; *MAP Kinase Signaling System ; Mitogen-Activated Protein Kinase 1/metabolism ; Mitogen-Activated Protein Kinase 10 ; Mitogen-Activated Protein Kinase Kinases/metabolism ; Mitogen-Activated Protein Kinases/*metabolism ; Models, Biological ; Protein-Tyrosine Kinases/*metabolism ; Proto-Oncogene Proteins c-jun/metabolism ; Receptor, Angiotensin, Type 1 ; Receptor, PAR-2 ; Receptors, Angiotensin/metabolism ; Receptors, Thrombin/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Reduced MAP kinase phosphatase-1 degradation after p42/p44MAPK-dependent phosphorylation (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-05
    Description: The mitogen-activated protein (MAP) kinase cascade is inactivated at the level of MAP kinase by members of the MAP kinase phosphatase (MKP) family, including MKP-1. MKP-1 was a labile protein in CCL39 hamster fibroblasts; its degradation was attenuated by inhibitors of the ubiquitin-directed proteasome complex. MKP-1 was a target in vivo and in vitro for p42(MAPK) or p44(MAPK), which phosphorylates MKP-1 on two carboxyl-terminal serine residues, Serine 359 and Serine 364. This phosphorylation did not modify MKP-1's intrinsic ability to dephosphorylate p44(MAPK) but led to stabilization of the protein. These results illustrate the importance of regulated protein degradation in the control of mitogenic signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brondello, J M -- Pouyssegur, J -- McKenzie, F R -- GM26939/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2514-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Signaling, Developmental Biology and Cancer Research, CNRS UMR 6543, Centre A. Lacassagne, 33 Avenue de Valombrose, Nice 06189, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617468" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood ; *Cell Cycle Proteins ; Cell Division ; Cell Line ; Cricetinae ; Culture Media ; Cysteine Endopeptidases/metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Dual Specificity Phosphatase 1 ; Estradiol/pharmacology ; Humans ; Immediate-Early Proteins/chemistry/*metabolism ; Leucine/analogs & derivatives/pharmacology ; Leupeptins/pharmacology ; MAP Kinase Signaling System ; Mitogen-Activated Protein Kinase 1/*metabolism ; Mitogen-Activated Protein Kinase 3 ; Mitogen-Activated Protein Kinases/*metabolism ; Multienzyme Complexes/metabolism ; Mutation ; Nitrophenols/metabolism ; Organophosphorus Compounds/metabolism ; *Phosphoprotein Phosphatases ; Phosphorylation ; Proteasome Endopeptidase Complex ; Protein Phosphatase 1 ; Protein Tyrosine Phosphatases/chemistry/*metabolism ; Ubiquitins/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Growth factors induce phosphorylation of the Na+/H+ antiporter, glycoprotein of 110 kD (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-09
    Description: The Na+/H+ antiporter, which regulates intracellular pH in virtually all cells, is one of the best examples of a mitogen- and oncogene-activated membrane target whose activity rapidly changes on stimulation. The activating mechanism is unknown. A Na+/H+ antiporter complementary DNA fragment was expressed in Escherichia coli as a beta-galactosidase fusion protein, and a specific antibody to the fusion protein was prepared. Use of this antibody revealed that the Na+/H+ antiporter is a 110-kilodalton glycoprotein that is phosphorylated in growing cells. Mitogenic activation of resting hamster fibroblasts and A431 human epidermoid cells with epidermal growth factor, thrombin, phorbol esters, or serum, stimulated phosphorylation of the Na+/H+ antiporter with a time course similar to that of the rise in intracellular pH.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sardet, C -- Counillon, L -- Franchi, A -- Pouyssegur, J -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):723-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre de Biochimie-CNRS, Nice, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2154036" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood ; Carrier Proteins/genetics/*metabolism ; Cell Line ; Cricetinae ; DNA/genetics ; Epidermal Growth Factor/pharmacology ; Escherichia coli/genetics ; Fibroblasts/metabolism ; Glycosylation ; Growth Substances/*pharmacology ; Humans ; Immunoblotting ; Mammary Tumor Virus, Mouse/genetics ; Molecular Weight ; Phosphorylation ; Promoter Regions, Genetic ; Recombinant Fusion Proteins/metabolism ; Sodium-Hydrogen Antiporter ; Thrombin/pharmacology ; Transfection ; beta-Galactosidase/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Identification of MAP kinase domains by redirecting stress signals into growth factor responses (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-06-14
    Description: Mitogen-activated protein kinase (MAPK) cascades, termed MAPK modules, channel extracellular signals into specific cellular responses. Chimeric molecules were constructed between p38 and p44 MAPKs, which transduce stress and growth factor signals, respectively. A discrete region of 40 residues located in the amono-terminal p38MAPK lobe directed the specificity of response to extracellular signals, whereas the p44MAPK chimera, expressed in vivo, redirected stress signals into early mitogenic responses, demonstrating the functional independence of these domains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brunet, A -- Pouyssegur, J -- New York, N.Y. -- Science. 1996 Jun 14;272(5268):1652-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre de Biochemie-CNRS, UMR134, Parc Valrose, Faculte des Sciences, Nice, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8658140" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Anisomycin/pharmacology ; Binding Sites ; Calcium-Calmodulin-Dependent Protein Kinases/genetics/*metabolism ; Cell Division ; Cell Line ; Cricetinae ; Cricetulus ; Enzyme Activation ; Gene Expression Regulation ; Genes, fos ; Growth Substances/metabolism ; Mice ; Mitogen-Activated Protein Kinase 3 ; *Mitogen-Activated Protein Kinases ; Molecular Sequence Data ; Phosphorylation/drug effects ; Protein Kinases/metabolism ; Protein-Serine-Threonine Kinases/metabolism ; Recombinant Fusion Proteins/genetics/metabolism ; Ribosomal Protein S6 Kinases ; Signal Transduction ; Sorbitol/pharmacology ; Substrate Specificity ; p38 Mitogen-Activated Protein Kinases
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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