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2014 ; 289
(40
): 27386-99
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Epithelial splicing regulatory proteins 1 (ESRP1) and 2 (ESRP2) suppress cancer
cell motility via different mechanisms
#MMPMID25143390
Ishii H
; Saitoh M
; Sakamoto K
; Kondo T
; Katoh R
; Tanaka S
; Motizuki M
; Masuyama K
; Miyazawa K
J Biol Chem
2014[Oct]; 289
(40
): 27386-99
PMID25143390
show ga
ESRP1 (epithelial splicing regulatory protein 1) and ESRP2 regulate alternative
splicing events associated with epithelial phenotypes of cells, and both are
down-regulated during the epithelial-mesenchymal transition. However, little is
known about their expression and functions during carcinogenesis. In this study,
we found that expression of both ESRP1 and ESRP2 is plastic: during oral squamous
cell carcinogenesis, these proteins are up-regulated relative to their levels in
normal epithelium but down-regulated in invasive fronts. Importantly, ESRP1 and
ESRP2 are re-expressed in the lymph nodes, where carcinoma cells metastasize and
colonize. In head and neck carcinoma cell lines, ESRP1 and ESRP2 suppress cancer
cell motility through distinct mechanisms: knockdown of ESRP1 affects the
dynamics of the actin cytoskeleton through induction of Rac1b, whereas knockdown
of ESRP2 attenuates cell-cell adhesion through increased expression of
epithelial-mesenchymal transition-associated transcription factors.
Down-regulation of ESRP1 and ESRP2 is thus closely associated with a motile
phenotype of cancer cells.