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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(13
): 6936-45
Nephropedia Template TP
Johnson JJ
; Miller DL
; Jiang R
; Liu Y
; Shi Z
; Tarwater L
; Williams R
; Balsara R
; Sauter ER
; Stack MS
J Biol Chem
2016[Mar]; 291
(13
): 6936-45
PMID26839311
show ga
Oral cancer is the sixth most common cause of death from cancer with an estimated
400,000 deaths worldwide and a low (50%) 5-year survival rate. The most common
form of oral cancer is oral squamous cell carcinoma (OSCC). OSCC is highly
inflammatory and invasive, and the degree of inflammation correlates with tumor
aggressiveness. The G protein-coupled receptor protease-activated receptor-2
(PAR-2) plays a key role in inflammation. PAR-2 is activated via proteolytic
cleavage by trypsin-like serine proteases, including kallikrein-5 (KLK5), or by
treatment with activating peptides. PAR-2 activation induces G protein-?-mediated
signaling, mobilizing intracellular calcium and Nf-?B signaling, leading to the
increased expression of pro-inflammatory mRNAs. Little is known, however, about
PAR-2 regulation of inflammation-related microRNAs. Here, we assess PAR-2
expression and function in OSCC cell lines and tissues. Stimulation of PAR-2
activates Nf-?B signaling, resulting in RelA nuclear translocation and enhanced
expression of pro-inflammatory mRNAs. Concomitantly, suppression of the
anti-inflammatory tumor suppressor microRNAs let-7d, miR-23b, and miR-200c was
observed following PAR-2 stimulation. Analysis of orthotopic oral tumors
generated by cells with reduced KLK5 expression showed smaller, less aggressive
lesions with reduced inflammatory infiltrate relative to tumors generated by
KLK5-expressing control cells. Together, these data support a model wherein
KLK5-mediated PAR-2 activation regulates the expression of
inflammation-associated mRNAs and microRNAs, thereby modulating progression of
oral tumors.