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2016 ; 30
(22
): 2459-2474
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English Wikipedia
IMPs: an RNA-binding protein family that provides a link between stem cell
maintenance in normal development and cancer
#MMPMID27940961
Degrauwe N
; Suvā ML
; Janiszewska M
; Riggi N
; Stamenkovic I
Genes Dev
2016[Nov]; 30
(22
): 2459-2474
PMID27940961
show ga
IMPs, also known as insulin-like growth factor 2 (IGF2) messenger RNA
(mRNA)-binding proteins (IGF2BPs), are highly conserved oncofetal RNA-binding
proteins (RBPs) that regulate RNA processing at several levels, including
localization, translation, and stability. Three mammalian IMP paralogs (IMP1-3)
have been identified that are expressed in most organs during embryogenesis,
where they are believed to play an important role in cell migration, metabolism,
and stem cell renewal. Whereas some IMP2 expression is retained in several adult
mouse organs, IMP1 and IMP3 are either absent or expressed at very low levels in
most tissues after birth. However, all three paralogs can be re-expressed upon
malignant transformation and are found in a broad range of cancer types where
their expression often correlates with poor prognosis. IMPs appear to resume
their physiological functions in malignant cells, which not only contribute to
tumor progression but participate in the establishment and maintenance of tumor
cell hierarchies. This review summarizes our current understanding of the
functions of IMPs during normal development and focuses on a series of recent
observations that have provided new insight into how their physiological
functions enable IMPs to play a potentially key role in cancer stem cell
maintenance and tumor growth.