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2015 ; 6
(7
): 4757-72
Nephropedia Template TP
gab.com Text
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English Wikipedia
FAK activation is required for IGF1R-mediated regulation of EMT, migration, and
invasion in mesenchymal triple negative breast cancer cells
#MMPMID25749031
Taliaferro-Smith L
; Oberlick E
; Liu T
; McGlothen T
; Alcaide T
; Tobin R
; Donnelly S
; Commander R
; Kline E
; Nagaraju GP
; Havel L
; Marcus A
; Nahta R
; O'Regan R
Oncotarget
2015[Mar]; 6
(7
): 4757-72
PMID25749031
show ga
Triple negative breast cancer (TNBC) is a highly metastatic disease that
currently lacks effective prevention and treatment strategies. The insulin-like
growth factor 1 receptor (IGF1R) and focal adhesion kinase (FAK) signaling
pathways function in numerous developmental processes, and alterations in both
are linked with a number of common pathological diseases. Overexpression of IGF1R
and FAK are closely associated with metastatic breast tumors. The present study
investigated the interrelationship between IGF1R and FAK signaling in regulating
the malignant properties of TNBC cells. Using small hairpin RNA (shRNA)-mediated
IGF1R silencing methods, we showed that IGF1R is essential for sustaining
mesenchymal morphologies of TNBC cells and modulates the expression of
EMT-related markers. We further showed that IGF1R overexpression promotes
migratory and invasive behaviors of TNBC cell lines. Most importantly,
IGF1R-driven migration and invasion is predominantly mediated by FAK activation
and can be suppressed using pharmacological inhibitors of FAK. Our findings in
TNBC cells demonstrate a novel role of the IGF1R/FAK signaling pathway in
regulating critical processes involved in the metastatic cascade. These results
may improve the current understanding of the basic molecular mechanisms of TNBC
metastasis and provide a strong rationale for co-targeting of IGF1R and FAK as
therapy for mesenchymal TNBCs.