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2017 ; 7
(ä): 43206
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Pentabromophenol suppresses TGF-? signaling by accelerating degradation of type
II TGF-? receptors via caveolae-mediated endocytosis
#MMPMID28230093
Chen CL
; Yang PH
; Kao YC
; Chen PY
; Chung CL
; Wang SW
Sci Rep
2017[Feb]; 7
(ä): 43206
PMID28230093
show ga
Pentabromophenol (PBP), a brominated flame retardant (BFR), is widely used in
various consumer products. BFRs exert adverse health effects such as neurotoxic
and endocrine-disrupting effects. In this study, we found that PBP suppressed
TGF-? response by accelerating the turnover rate of TGF-? receptors. PBP
suppressed TGF-?-mediated cell migration, PAI-1 promoter-driven reporter gene
activation, and Smad2/3 phosphorylation in various cell types. Furthermore, PBP
abolished TGF-?-mediated repression of E-cadherin expression, in addition to the
induction of vimentin expression and N-cadherin and fibronectin upregulation,
thus blocking TGF-?-induced epithelial-mesenchymal transition in A549 and NMuMG
cells. However, this inhibition was not observed with other congeners such as
tribromophenol and triiodophenol. TGF-? superfamily members play key roles in
regulating various biological processes including cell proliferation and
migration as well as cancer development and progression. The results of this in
vitro study provide a basis for studies on the detailed relationship between PBP
and modulation of TGF-? signalling. Because PBP is similar to other BFRs such as
polybrominated diphenyl ethers (PBDEs), additional laboratory and mechanistic
studies should be performed to examine BFRs as potential risk factors for
tumorigenesis and other TGF-?-related diseases.