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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 Sci+Rep
2015 ; 5
(ä): 18233
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gab.com Text
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Transforming Growth Factor-?1 Induced Epithelial Mesenchymal Transition is
blocked by a chemical antagonist of translation factor eIF4E
#MMPMID26678431
Smith KA
; Zhou B
; Avdulov S
; Benyumov A
; Peterson M
; Liu Y
; Okon A
; Hergert P
; Braziunas J
; Wagner CR
; Borok Z
; Bitterman PB
Sci Rep
2015[Dec]; 5
(ä): 18233
PMID26678431
show ga
The epithelial to mesenchymal transition (EMT) imparts disease-defining
properties to epithelial cells in cancer and organ fibrosis. Prior studies
identify EMT control points at the level of transcription and translation, and
indicate that activation of translation initiation factor 4E (eIF4E) is involved
in the mechanisms coordinating these two levels of control. Here we show that
4Ei-1, a specific chemical antagonist of the eIF4E-mRNA cap interaction, potently
inhibits transforming growth factor beta 1 (TGF-?1) mediated EMT in lung
epithelial cells. Upon treatment with TGF-?1, we observed a rapid recruitment of
Snail1 mRNA into the actively translated polysome pool accompanied by
accumulation of the EMT transcription factor Snail1 in the nucleus. 4Ei-1 blocks
ribosome recruitment to the Snail1 transcript thereby preventing accumulation of
the Snail1 protein in the nucleus. Our findings establish an obligatory role for
upstream translational control of downstream Snail1-mediated transcriptional
events in TGF-?1 induced EMT, and provide proof of concept for efforts to
pharmacologically modulate the eIF4E-cap interaction as a means to inhibit
pathological EMT in the setting of cancer and organ fibrosis.