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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 Endocrinology
2014 ; 155
(6
): 2077-88
Nephropedia Template TP
gab.com Text
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English Wikipedia
The sonic hedgehog-induced type 3 deiodinase facilitates tumorigenesis of basal
cell carcinoma by reducing Gli2 inactivation
#MMPMID24693967
Luongo C
; Ambrosio R
; Salzano S
; Dlugosz AA
; Missero C
; Dentice M
Endocrinology
2014[Jun]; 155
(6
): 2077-88
PMID24693967
show ga
Thyroid hormone (TH) is an important regulator of growth, development, and
metabolism. Most of the active TH T3 is generated by peripheral TH metabolism
mediated by the iodothyronine deiodinases. Type 3 deiodinase (D3) inactivates T3
via specific deiodination reactions. It is an oncofetal protein frequently
expressed in neoplastic tissues and is a direct target of the sonic hedgehog
(Shh) pathway in basal cell carcinomas (BCCs). However, the molecular mechanisms
triggered by T3 in BCC are still mostly unrevealed. Here, we demonstrate that D3
action is critical in the proliferation and survival of BCC cells. D3 depletion
or T3 treatment induce apoptosis of BCC cells and attenuate Shh signaling. This
is achieved through a direct impairment of Gli2 protein stability by T3. T3
induces protein kinase A, which in turn destabilizes Gli2 protein via its
C-terminal degron. Finally, in a mouse model of BCC, T3-topical treatment
significantly reduces tumor growth. These results demonstrate the existence of a
previously unrecognized cross talk between TH and Gli2 oncogene, providing
functional and mechanistic evidence of the involvement of TH metabolism in
Shh-induced cancer. TH-mediated Gli2 inactivation would be beneficial for
therapeutically purposes, because the inhibition of Shh-Gli2 signaling is an
attractive target for several anticancer drugs, currently in clinical trials.