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2017 ; 8
(34
): 56659-56671
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PRPF overexpression induces drug resistance through actin cytoskeleton
rearrangement and epithelial-mesenchymal transition
#MMPMID28915620
Islam SU
; Shehzad A
; Sonn JK
; Lee YS
Oncotarget
2017[Aug]; 8
(34
): 56659-56671
PMID28915620
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Pre-mRNA processing factor (PRPF) 4B kinase belongs to the CDK-like kinase
family, and is involved in pre-mRNA splicing, and in signal transduction. In this
study, we observed that PRPF overexpression decreased the intracellular levels of
reactive oxygen species, and inhibited resveratrol-induced apoptosis by
activating the cell survival signaling proteins NF?B, ERK, and c-MYC in HCT116
human colon cancer cells. PRPF overexpression altered cellular morphology, and
rearranged the actin cytoskeleton, by regulating the activity of Rho family
proteins. Moreover, it decreased the activity of RhoA, but increased the
expression of Rac1. In addition, PRPF triggered the epithelial-mesenchymal
transition (EMT), and decreased the invasiveness of HCT116, PC3 human prostate,
and B16-F10 melanoma cells. The loss of E-cadherin, a hallmark of EMT, was
observed in HCT116 cells overexpressing PRPF. Taken together, these results
indicate that PRPF blocks the apoptotic effects of resveratrol by activating cell
survival signaling pathways, rearranging the actin cytoskeleton, and inducing
EMT. The elucidation of the mechanisms that underlie anticancer drug resistance
and the anti-apoptosis effect of PRPF may provide a therapeutic basis for
inhibiting tumor growth and preventing metastasis in various cancers.