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2017 ; 17
(1
): 350
Nephropedia Template TP
gab.com Text
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English Wikipedia
Cleavage of the urokinase receptor (uPAR) on oral cancer cells: regulation by
transforming growth factor - ?1 (TGF-?1) and potential effects on migration and
invasion
#MMPMID28526008
Magnussen SN
; Hadler-Olsen E
; Costea DE
; Berg E
; Jacobsen CC
; Mortensen B
; Salo T
; Martinez-Zubiaurre I
; Winberg JO
; Uhlin-Hansen L
; Svineng G
BMC Cancer
2017[May]; 17
(1
): 350
PMID28526008
show ga
BACKGROUND: Urokinase plasminogen activator (uPA) receptor (uPAR) is up-regulated
at the invasive tumour front of human oral squamous cell carcinoma (OSCC),
indicating a role for uPAR in tumour progression. We previously observed elevated
expression of uPAR at the tumour-stroma interface in a mouse model for OSCC,
which was associated with increased proteolytic activity. The tumour
microenvironment regulated uPAR expression, as well as its glycosylation and
cleavage. Both full-length- and cleaved uPAR (uPAR (II-III)) are involved in
highly regulated processes such as cell signalling, proliferation, migration,
stem cell mobilization and invasion. The aim of the current study was to analyse
tumour associated factors and their effect on uPAR cleavage, and the potential
implications for cell proliferation, migration and invasion. METHODS: Mouse uPAR
was stably overexpressed in the mouse OSCC cell line AT84. The ratio of
full-length versus cleaved uPAR as analysed by Western blotting and its
regulation was assessed by addition of different protease inhibitors and
transforming growth factor - ?1 (TGF-?1). The role of uPAR cleavage in cell
proliferation and migration was analysed using real-time cell analysis and
invasion was assessed using the myoma invasion model. RESULTS: We found that when
uPAR was overexpressed a proportion of the receptor was cleaved, thus the cells
presented both full-length uPAR and uPAR (II-III). Cleavage was mainly performed
by serine proteases and urokinase plasminogen activator (uPA) in particular. When
the OSCC cells were stimulated with TGF-?1, the production of the uPA inhibitor
PAI-1 was increased, resulting in a reduction of uPAR cleavage. By inhibiting
cleavage of uPAR, cell migration was reduced, and by inhibiting uPA activity,
invasion was reduced. We could also show that medium containing soluble uPAR
(suPAR), and cleaved soluble uPAR (suPAR (II-III)), induced migration in OSCC
cells with low endogenous levels of uPAR. CONCLUSIONS: These results show that
soluble factors in the tumour microenvironment, such as TGF-?1, PAI-1 and uPA,
can influence the ratio of full length and uPAR (II-III) and thereby potentially
effect cell migration and invasion. Resolving how uPAR cleavage is controlled is
therefore vital for understanding how OSCC progresses and potentially provides
new targets for therapy.