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2017 ; 7
(1
): 9033
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Subcellular domain-dependent molecular hierarchy of SFK and FAK in
mechanotransduction and cytokine signaling
#MMPMID28831165
Wan Q
; TruongVo T
; Steele HE
; Ozcelikkale A
; Han B
; Wang Y
; Oh J
; Yokota H
; Na S
Sci Rep
2017[Aug]; 7
(1
): 9033
PMID28831165
show ga
Focal adhesion kinase (FAK) and Src family kinases (SFK) are known to play
critical roles in mechanotransduction and other crucial cell functions. Recent
reports indicate that they reside in different microdomains of the plasma
membrane. However, little is known about their subcellular domain-dependent roles
and responses to extracellular stimuli. Here, we employed fluorescence resonance
energy transfer (FRET)-based biosensors in conjunction with collagen-coupled
agarose gels to detect subcellular activities of SFK and FAK in three-dimensional
(3D) settings. We observed that SFK and FAK in the lipid rafts and nonrafts are
differently regulated by fluid flow and pro-inflammatory cytokines. Inhibition of
FAK in the lipid rafts blocked SFK response to fluid flow, while inhibition of
SFK in the non-rafts blocked FAK activation by the cytokines. Ex-vivo FRET
imaging of mouse cartilage explants showed that intermediate level of
interstitial fluid flow selectively decreased cytokine-induced SFK/FAK
activation. These findings suggest that SFK and FAK exert distinctive molecular
hierarchy depending on their subcellular location and extracellular stimuli.