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2017 ; 12
(9
): e0184285
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Direct integrin binding to insulin-like growth factor-2 through the C-domain is
required for insulin-like growth factor receptor type 1 (IGF1R) signaling
#MMPMID28873464
Cedano Prieto DM
; Cheng Y
; Chang CC
; Yu J
; Takada YK
; Takada Y
PLoS One
2017[]; 12
(9
): e0184285
PMID28873464
show ga
We have reported that integrins crosstalk with growth factors through direct
binding to growth factors (e.g., fibroblast growth factor-1, insulin-like growth
factor 1 (IGF1), neuregulin-1, fractalkine) and subsequent ternary complex
formation with cognate receptor [e.g., integrin/IGF1/IGF1 receptor (IGF1R)]. IGF1
and IGF2 are overexpressed in cancer and major therapeutic targets. We previously
reported that IGF1 binds to integrins ???3 and ?6?4, and the R36E/R37E mutant in
the C-domain of IGF1 is defective integrin binding and signaling functions of
IGF1, and acts as an antagonist of IGF1R. We studied if integrins play a role in
the signaling functions of IGF2, another member of the IGF family. Here we
describe that IGF2 specifically binds to integrins ???3 and ?6?4, and induced
proliferation of CHO cells (IGF1R+) that express ???3 or ?6?4 (?3- or ?6?4-CHO
cells). Arg residues to Glu at positions 24, 34, 37 and/or 38 in or close to the
C-domain of IGF2 play a critical role in binding to integrins and signaling
functions. The R24E/R37E/R38E, R34E/R37E/R38E, and R24E/R34E/R37E/R38E mutants
were defective in integrin binding and IGF2 signaling. These mutants suppressed
proliferation induced by WT IGF2, suggesting that they are dominant-negative
antagonists of IGF1R. These results suggest that IGF2 also requires integrin
binding for signaling functions, and the IGF2 mutants that cannot bind to
integrins act as antagonists of IGF1R. The present study defines the role of the
C-domain in integrin binding and signaling.