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2016 ; 7
(46
): 76062-76075
Nephropedia Template TP
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Hedgehog and TGF? signaling converge on Gli2 to control bony invasion and bone
destruction in oral squamous cell carcinoma
#MMPMID27738315
Cannonier SA
; Gonzales CB
; Ely K
; Guelcher SA
; Sterling JA
Oncotarget
2016[Nov]; 7
(46
): 76062-76075
PMID27738315
show ga
Oral Squamous Cell Carcinoma (OSCC) is the sixth most common cancer worldwide.
OSCC invasion into the lymph nodes and mandible correlates with increased rates
of recurrence and lower overall survival. Tumors that infiltrate mandibular bone
proliferate rapidly and induce bone destruction. While survival rates have
increased 12% over the last 20 years, this improvement is attributed to general
advances in prevention, earlier detection, and updated treatments. Additionally,
despite decades of research, the molecular mechanisms of OSCC invasion into the
mandible are not well understood. Parathyroid Hormone-related Protein (PTHrP),
has been shown to be essential for mandibular invasion in OSCC animal models, and
our previous studies demonstrate that the transcription factor Gli2 increases
PTHrP expression in tumor metastasis to bone. In OSCC, we investigated regulators
of Gli2, including Hedgehog, TGF?, and Wnt signaling to elucidate how PTHrP
expression is controlled. Here we show that canonical Hedgehog and TGF? signaling
cooperate to increase PTHrP expression and mandibular invasion in a
Gli2-dependent manner. Additionally, in an orthotopic model of mandibular
invasion, inhibition of Gli2 using shRNA resulted in a significant decrease of
both PTHrP expression and bony invasion. Collectively, our findings demonstrate
that multiple signaling pathways converge on Gli2 to mediate PTHrP expression and
bony invasion, highlighting Gli2 as a therapeutic target to prevent bony invasion
in OSCC.
|Animals
[MESH]
|Bone and Bones/diagnostic imaging/*pathology
[MESH]