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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2015 ; 290
(18
): 11578-90
Nephropedia Template TP
gab.com Text
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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]