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Endocrinology, Vol 135, 2228-2239, Copyright © 1994 by Endocrine Society
ARTICLES |
SJ Frank, G Gilliland, AS Kraft and CS Arnold
Department of Medicine, University of Alabama, Birmingham 35294.
An early step in GH action involves tyrosine phosphorylation of various cellular proteins. Recently, it has been shown in murine preadipocytes that GH promotes the association of its receptor (the GHR) with and the activation of the JAK2 tyrosine kinase. In this study, we confirmed the human (h) GH-induced association of JAK2 with hGHR in IM-9 cells by coimmunoprecipitation experiments using anti-hGHR serum. We further examined the interaction of JAK2 with the GHR cytoplasmic domain by two lines of investigation. For in vitro studies, we assayed by immunoblotting the ability of cell-derived JAK2 to interact with glutathione S-transferase fusion proteins containing elements of the hGHR cytoplasmic domain. A fusion protein containing the entire hGHR cytoplasmic domain (residues 271-620) specifically associated with JAK2 independent of prior stimulation of cells with hGH. This interaction was not dependent on tyrosine phosphorylation of either partner. Mutational analysis of the hGHR cytoplasmic domain component of the fusions indicated that a membrane-proximal 20-residue region that includes the proline-rich box 1 was necessary for the interaction. This region appeared to cooperate with another region(s), largely in the N- terminal one third of the cytoplasmic domain, to promote full interaction with JAK2. For in vivo reconstitution experiments, wild- type (WT) and mutant rabbit GHRs (rGHRs) along with murine JAK2 were expressed by transient transfection in COS-7 cells. rGHR mutations were confined to the cytoplasmic domain and included C-terminal truncations as well as internal deletions of residues 297-406 and 278-292 (the latter contains box 1). All mutant rGHRs were expressed at the cell surface and bound hGH to a degree similar to the WT rGHR. Receptors were tested for their ability to mediate the hGH-induced immunoprecipitability of JAK2 with phosphotyrosine (APT) antibodies. A rGHR truncated to residue 275 [rGHR-(1-275)], which contains only five cytoplasmic residues, failed to mediate JAK2 APT precipitability in response to hGH. In contrast, WT rGHR; the C-terminal truncations rGHR- (1-542), rGHR-(1-390), and rGHR-(1-317); and the rGHR-(d297-406) deletion mutant maintained this ability. Deletion of the 278-292 box 1- containing region in the context of either rGHR-(d297-406) or WT rGHR eliminated detectable hGH-induced JAK2 APT precipitability. Interestingly, rGHR-(1-292), which includes box 1, was not able to mediate significant hGH-induced JAK2 APT precipitability.(ABSTRACT TRUNCATED AT 400 WORDS)
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S.-O. Kim, J. Jiang, W. Yi, G.-S. Feng, and S. J. Frank Involvement of the Src Homology 2-containing Tyrosine Phosphatase SHP-2 in Growth Hormone Signaling J. Biol. Chem., January 23, 1998; 273(4): 2344 - 2354. [Abstract] [Full Text] [PDF] |
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L. S. Argetsinger, G. Norstedt, N. Billestrup, M. F. White, and C. Carter-Su Growth Hormone, Interferon-gamma , and Leukemia Inhibitory Factor Utilize Insulin Receptor Substrate-2 in Intracellular Signaling J. Biol. Chem., November 15, 1996; 271(46): 29415 - 29421. [Abstract] [Full Text] [PDF] |
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R. H. Hackett, Y.-D. Wang, and A. C. Larner Mapping of the Cytoplasmic Domain of the Human Growth Hormone Receptor Required for the Activation of Jak2 and Stat Proteins J. Biol. Chem., September 8, 1995; 270(36): 21326 - 21330. [Abstract] [Full Text] [PDF] |
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L. S. Argetsinger, G. W. Hsu, M. G. Myers Jr., N. Billestrup, M. F. White, and C. Carter-Su Growth Hormone, Interferon-[IMAGE], and Leukemia Inhibitory Factor Promoted Tyrosyl Phosphorylation of Insulin Receptor Substrate-1 J. Biol. Chem., June 16, 1995; 270(24): 14685 - 14692. [Abstract] [Full Text] [PDF] |
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S. J. Frank, W. Yi, Y. Zhao, J. F. Goldsmith, G. Gilliland, J. Jiang, I. Sakai, and A. S. Kraft Regions of the JAK2 Tyrosine Kinase Required for Coupling to the Growth Hormone Receptor J. Biol. Chem., June 16, 1995; 270(24): 14776 - 14785. [Abstract] [Full Text] [PDF] |
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Y. Zhao, F. Wagner, S. J. Frank, and A. S. Kraft The Amino-terminal Portion of the JAK2 Protein Kinase Is Necessary For Binding and Phosphorylation of the Granulocyte-Macrophage Colony-stimulating Factor Receptor [IMAGE][IMAGE] Chain J. Biol. Chem., June 9, 1995; 270(23): 13814 - 13818. [Abstract] [Full Text] [PDF] |
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J. VanderKuur, G. Allevato, N. Billestrup, G. Norstedt, and C. Carter-Su Growth Hormone-promoted Tyrosyl Phosphorylation of SHC Proteins and SHC Association with Grb2 J. Biol. Chem., March 31, 1995; 270(13): 7587 - 7593. [Abstract] [Full Text] [PDF] |
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C. M. A. dos Santos, P. van Kerkhof, and G. J. Strous The Signal Transduction of the Growth Hormone Receptor Is Regulated by the Ubiquitin/Proteasome System and Continues After Endocytosis J. Biol. Chem., March 30, 2001; 276(14): 10839 - 10846. [Abstract] [Full Text] [PDF] |
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Y. Zhang, R. Guan, J. Jiang, J. J. Kopchick, R. A. Black, G. Baumann, and S. J. Frank Growth Hormone (GH)-induced Dimerization Inhibits Phorbol Ester-stimulated GH Receptor Proteolysis J. Biol. Chem., June 29, 2001; 276(27): 24565 - 24573. [Abstract] [Full Text] [PDF] |
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C. M. Alves dos Santos, T. ten Broeke, and G. J. Strous Growth Hormone Receptor Ubiquitination, Endocytosis, and Degradation Are Independent of Signal Transduction via Janus Kinase 2 J. Biol. Chem., August 24, 2001; 276(35): 32635 - 32641. [Abstract] [Full Text] [PDF] |
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