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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
2016 ; 291
(15
): 8140-9
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Regulation of Ligand and Shear Stress-induced Insulin-like Growth Factor 1 (IGF1)
Signaling by the Integrin Pathway
#MMPMID26865633
Tahimic CG
; Long RK
; Kubota T
; Sun MY
; Elalieh H
; Fong C
; Menendez AT
; Wang Y
; Vilardaga JP
; Bikle DD
J Biol Chem
2016[Apr]; 291
(15
): 8140-9
PMID26865633
show ga
Mechanical loading of the skeleton, as achieved during daily movement and
exercise, preserves bone mass and stimulates bone formation, whereas skeletal
unloading from prolonged immobilization leads to bone loss. A functional
interplay between the insulin-like growth factor 1 receptor (IGF1R), a major
player in skeletal development, and integrins, mechanosensors, is thought to
regulate the anabolic response of osteogenic cells to mechanical load. The
mechanistic basis for this cross-talk is unclear. Here we report that integrin
signaling regulates activation of IGF1R and downstream targets in response to
both IGF1 and a mechanical stimulus. In addition, integrins potentiate
responsiveness of IGF1R to IGF1 and mechanical forces. We demonstrate that
integrin-associated kinases, Rous sarcoma oncogene (SRC) and focal adhesion
kinase (FAK), display distinct actions on IGF1 signaling; FAK regulates IGF1R
activation and its downstream effectors, AKT and ERK, whereas SRC controls
signaling downstream of IGF1R. These findings linked to our observation that IGF1
assembles the formation of a heterocomplex between IGF1R and integrin ?3 subunit
indicate that the regulation of IGF1 signaling by integrins proceeds by direct
receptor-receptor interaction as a possible means to translate biomechanical
forces into osteoanabolic signals.