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10.1074/jbc.M114.620237

http://scihub22266oqcxt.onion/10.1074/jbc.M114.620237
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suck abstract from ncbi


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pmid25787077
      J+Biol+Chem 2015 ; 290 (18 ): 11578-90
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  • The coordinate cellular response to insulin-like growth factor-I (IGF-I) and insulin-like growth factor-binding protein-2 (IGFBP-2) is regulated through vimentin binding to receptor tyrosine phosphatase ? (RPTP?) #MMPMID25787077
  • Shen X ; Xi G ; Wai C ; Clemmons DR
  • J Biol Chem 2015[May]; 290 (18 ): 11578-90 PMID25787077 show ga
  • Insulin-like growth factor-binding protein-2 (IGFBP-2) functions coordinately with IGF-I to stimulate cellular proliferation and differentiation. IGFBP-2 binds to receptor tyrosine phosphatase ? (RPTP?), and this binding in conjunction with IGF-I receptor stimulation induces RPTP? polymerization leading to phosphatase and tensin homolog inactivation, AKT stimulation, and enhanced cell proliferation. To determine the mechanism by which RPTP? polymerization is regulated, we analyzed the protein(s) that associated with RPTP? in response to IGF-I and IGFBP-2 in vascular smooth muscle cells. Proteomic experiments revealed that IGF-I stimulated the intermediate filament protein vimentin to bind to RPTP?, and knockdown of vimentin resulted in failure of IGFBP-2 and IGF-I to stimulate RPTP? polymerization. Knockdown of IGFBP-2 or inhibition of IGF-IR tyrosine kinase disrupted vimentin/RPTP? association. Vimentin binding to RPTP? was mediated through vimentin serine phosphorylation. The serine threonine kinase PKC? was recruited to vimentin in response to IGF-I and inhibition of PKC? activation blocked these signaling events. A cell-permeable peptide that contained the vimentin phosphorylation site disrupted vimentin/RPTP? association, and IGF-I stimulated RPTP? polymerization and AKT activation. Integrin-linked kinase recruited PKC? to SHPS-1-associated vimentin in response to IGF-I and inhibition of integrin-linked kinase/PKC? association reduced vimentin serine phosphorylation. PKC? stimulation of vimentin phosphorylation required high glucose and vimentin/RPTP?-association occurred only during hyperglycemia. Disruption of vimetin/RPTP? in diabetic mice inhibited RPTP? polymerization, vimentin serine phosphorylation, and AKT activation in response to IGF-I, whereas nondiabetic mice showed no difference. The induction of vimentin phosphorylation is important for IGFBP-2-mediated enhancement of IGF-I-stimulated proliferation during hyperglycemia, and it coordinates signaling between these two receptor-linked signaling systems.
  • |Amino Acid Sequence [MESH]
  • |Animals [MESH]
  • |Humans [MESH]
  • |Insulin-Like Growth Factor Binding Protein 2/*metabolism/pharmacology [MESH]
  • |Insulin-Like Growth Factor I/*metabolism/pharmacology [MESH]
  • |Mice [MESH]
  • |Molecular Sequence Data [MESH]
  • |Phosphorylation/drug effects [MESH]
  • |Protein Binding/drug effects [MESH]
  • |Protein Multimerization/drug effects [MESH]
  • |Protein Structure, Quaternary [MESH]
  • |Receptor-Like Protein Tyrosine Phosphatases, Class 5/chemistry/*metabolism [MESH]
  • |Signal Transduction/drug effects [MESH]
  • |Swine [MESH]


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