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2018 ; 16
(1
): 10
Nephropedia Template TP
gab.com Text
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Ras enhances TGF-? signaling by decreasing cellular protein levels of its type II
receptor negative regulator SPSB1
#MMPMID29534718
Liu S
; Iaria J
; Simpson RJ
; Zhu HJ
Cell Commun Signal
2018[Mar]; 16
(1
): 10
PMID29534718
show ga
BACKGROUND: Transformation by oncogene Ras overcomes TGF-? mediated growth
inhibition in epithelial cells. However, it cooperates with each other to mediate
epithelial to mesenchymal transition (EMT). The mechanism of how these two
pathways interact with each other is controversial. METHODS: Molecular techniques
were used to engineer expression plasmids for Ras, SPRY, TGF-? receptors, type I
and II and ubiquitin. Immunoprecipitation and western blots were employed to
determine protein-protein interactions, preotein levels, protein phosphorylation
while immunofluorecesent staining for molecular co-localization. TGF-? signalling
activities is also determined by its luciferase reporter assay. Trans-well assays
were used to measure cell migration and invasion. RESULTS: Ras interacts with the
SPSB1's SPRY domain to enhance TGF-? signaling. Ras interacts and colocalizes
with the TGF-? type II receptor's (T?RII) negative regulator SPSB1 on the cell
membrane, consequently promoting SPSB1 protein degradation via enhanced mono- and
di-ubiquitination. Reduced SPSB1 levels result in the stablization of T?RII, in
turn the increase of receptor levels significantly enhance Smad2/3
phosphorylation and signaling. Importantly, forced expression of SPSB1 in Ras
transformed cells suppresses TGF-? signaling and its mediated migration and
invasion. CONCLUSION: Ras positively cooperates with TGF-? signaling by reducing
the cellular protein levels of T?RII negative regualtor SPSB1.
|Animals
[MESH]
|B30.2-SPRY Domain
[MESH]
|Cell Movement/drug effects
[MESH]
|Cycloheximide/pharmacology
[MESH]
|Dogs
[MESH]
|Down-Regulation/drug effects
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Leupeptins/pharmacology
[MESH]
|Madin Darby Canine Kidney Cells
[MESH]
|Mutagenesis, Site-Directed
[MESH]
|Phosphorylation/drug effects
[MESH]
|Protein Binding
[MESH]
|Receptor, Transforming Growth Factor-beta Type II/metabolism
[MESH]
|Signal Transduction/drug effects
[MESH]
|Smad2 Protein/metabolism
[MESH]
|Suppressor of Cytokine Signaling Proteins/chemistry/genetics/*metabolism
[MESH]