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2016 ; 7
(50
): 82273-82288
Nephropedia Template TP
Lombardi O
; Varshney D
; Phillips NM
; Cowling VH
Oncotarget
2016[Dec]; 7
(50
): 82273-82288
PMID27756891
show ga
c-Myc is a potent driver of many human cancers. Since strategies for directly
targeting c-Myc protein have had limited success, upstream regulators and
downstream effectors of c-Myc are being investigated as alternatives for
therapeutic intervention. c-Myc regulates transcription and formation of the mRNA
cap, which is important for transcript maturation and translation. However, the
direct mechanism by which c-Myc upregulates mRNA capping is unclear. mRNA cap
formation initiates with the linkage of inverted guanosine via a triphosphate
bridge to the first transcribed nucleotide, catalysed by mRNA capping enzyme
(CE/RNGTT). Here we report that c-Myc increases the recruitment of catalytically
active CE to RNA polymerase II and to its target genes. c-Myc-induced target gene
expression, cell proliferation and cell transformation is highly dependent on CE,
but only when c-Myc is deregulated. Cells retaining normal control of c-Myc
expression are insensitive to repression of CE. c-Myc expression is also
dependent on CE. Therefore, inhibiting CE provides an attractive route for
selective therapeutic targeting of cancer cells which have acquired deregulated
c-Myc.