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2017 ; 8
(12
): 19137-19155
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English Wikipedia
Hyaluronan activates Hyal-2/WWOX/Smad4 signaling and causes bubbling cell death
when the signaling complex is overexpressed
#MMPMID27845895
Hsu LJ
; Hong Q
; Chen ST
; Kuo HL
; Schultz L
; Heath J
; Lin SR
; Lee MH
; Li DZ
; Li ZL
; Cheng HC
; Armand G
; Chang NS
Oncotarget
2017[Mar]; 8
(12
): 19137-19155
PMID27845895
show ga
Malignant cancer cells frequently secrete significant amounts of transforming
growth factor beta (TGF-?), hyaluronan (HA) and hyaluronidases to facilitate
metastasizing to target organs. In a non-canonical signaling, TGF-? binds
membrane hyaluronidase Hyal-2 for recruiting tumor suppressors WWOX and Smad4,
and the resulting Hyal-2/WWOX/Smad4 complex is accumulated in the nucleus to
enhance SMAD-promoter dependent transcriptional activity. Yeast two-hybrid
analysis showed that WWOX acts as a bridge to bind both Hyal-2 and Smad4. When
WWOX-expressing cells were stimulated with high molecular weight HA, an increased
formation of endogenous Hyal-2/WWOX/Smad4 complex occurred rapidly, followed by
relocating to the nuclei in 20-40 min. In WWOX-deficient cells, HA failed to
induce Smad2/3/4 relocation to the nucleus. To prove the signaling event, we
designed a real time tri-molecular FRET analysis and revealed that HA induces the
signaling pathway from ectopic Smad4 to WWOX and finally to p53, as well as from
Smad4 to Hyal-2 and then to WWOX. An increased binding of the Smad4/Hyal-2/WWOX
complex occurs with time in the nucleus that leads to bubbling cell death. In
contrast, HA increases the binding of Smad4/WWOX/p53, which causes membrane
blebbing but without cell death. In traumatic brain injury-induced neuronal
death, the Hyal-2/WWOX complex was accumulated in the apoptotic nuclei of neurons
in the rat brains in 24 hr post injury, as determined by immunoelectron
microscopy. Together, HA activates the Hyal-2/WWOX/Smad4 signaling and causes
bubbling cell death when the signaling complex is overexpressed.