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2016 ; 6
(ä): 128
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Cap-Independent Translational Control of Carcinogenesis
#MMPMID27252909
Walters B
; Thompson SR
Front Oncol
2016[]; 6
(ä): 128
PMID27252909
show ga
Translational regulation has been shown to play an important role in cancer and
tumor progression. Despite this fact, the role of translational control in cancer
is an understudied and under appreciated field, most likely due to the
technological hurdles and paucity of methods available to establish that changes
in protein levels are due to translational regulation. Tumors are subjected to
many adverse stress conditions such as hypoxia or starvation. Under stress
conditions, translation is globally downregulated through several different
pathways in order to conserve energy and nutrients. Many of the proteins that are
synthesized during stress in order to cope with the stress use a non-canonical or
cap-independent mechanism of initiation. Tumor cells have utilized these
alternative mechanisms of translation initiation to promote survival during tumor
progression. This review will specifically discuss the role of cap-independent
translation initiation, which relies on an internal ribosome entry site (IRES) to
recruit the ribosomal subunits internally to the messenger RNA. We will provide
an overview of the role of IRES-mediated translation in cancer by discussing the
types of genes that use IRESs and the conditions under which these mechanisms of
initiation are used. We will specifically focus on three well-studied examples:
Apaf-1, p53, and c-Jun, where IRES-mediated translation has been demonstrated to
play an important role in tumorigenesis or tumor progression.