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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 FEBS+Open+Bio
2016 ; 6
(4
): 317-25
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gab.com Text
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mTOR inhibition by rapamycin increases ceramide synthesis by promoting
transforming growth factor-?1/Smad signaling in the skin
#MMPMID27239444
Yamane T
; Muramatsu A
; Yoshino S
; Matsui S
; Shimura M
; Tsujii Y
; Iwatsuki K
; Kobayashi-Hattori K
; Oishi Y
FEBS Open Bio
2016[Apr]; 6
(4
): 317-25
PMID27239444
show ga
Although mammalian target of rapamycin (mTOR) mediates a wide variety of
biological functions, little information is available on the effect of mTOR on
the functions of skin cells. In this study, we investigated effects of mTOR
inhibition by rapamycin on ceramide synthesis in the skin of rats and human
keratinocytes and its regulatory mechanisms. The phosphorylation of p70 S6
kinase, which indicates mTOR activation, was induced in the skin of rats fed a
high-fat diet, but this abnormality was reversed by supplementation with
rapamycin. Ceramide levels and the mRNA levels of serine palmitoyltransferase
(SPT) and transforming growth factor (TGF)-?1 were suppressed in the skin of rats
fed high-fat diets, but this abnormality was reversed by supplementation with
rapamycin. TGF-?1-induced SPT mRNA expression was blocked by SB525334, an
inhibitor of TGF-?1-induced Smad2/3 nuclear localization, in human keratinocytes.
Rapamycin-induced SPT mRNA expression was blocked by an anti-TGF-?1 antibody or
SB525334 in human keratinocytes. These results show that mTOR inhibition by
rapamycin increases ceramide synthesis by promoting TGF-?1/Smad signaling in the
skin.