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2015 ; 6
(31
): 31569-92
Nephropedia Template TP
gab.com Text
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English Wikipedia
Decoding c-Myc networks of cell cycle and apoptosis regulated genes in a
transgenic mouse model of papillary lung adenocarcinomas
#MMPMID26427040
Ciribilli Y
; Singh P
; Spanel R
; Inga A
; Borlak J
Oncotarget
2015[Oct]; 6
(31
): 31569-92
PMID26427040
show ga
The c-Myc gene codes for a basic-helix-loop-helix-leucine zipper transcription
factor protein and is reported to be frequently over-expressed in human cancers.
Given that c-Myc plays an essential role in neoplastic transformation we wished
to define its activity in lung cancer and therefore studied its targeted
expression to respiratory epithelium in a transgenic mouse disease model. Using
histological well-defined tumors, transcriptome analysis identified novel c-Myc
responsive cell cycle and apoptosis genes that were validated as direct c-Myc
targets using EMSA, Western blotting, gene reporter and ChIP assays.Through
computational analyses c-Myc cooperating transcription factors emerged for
repressed and up-regulated genes in cancer samples, namely Klf7, Gata3, Sox18,
p53 and Elf5 and Cebp?, respectively. Conversely, at promoters of genes regulated
in transgenic but non-carcinomatous lung tissue enriched binding sites for c-Myc,
Hbp1, Hif1 were observed. Bioinformatic analysis of tumor transcriptomic data
revealed regulatory gene networks and highlighted mortalin and moesin as master
regulators while gene reporter and ChIP assays in the H1299 lung cancer cell line
as well as cross-examination of published ChIP-sequence data of 7 human and 2
mouse cell lines provided strong evidence for the identified genes to be c-Myc
targets. The clinical significance of findings was established by evaluating
expression of orthologous proteins in human lung cancer. Taken collectively, a
molecular circuit for c-Myc-dependent cellular transformation was identified and
the network analysis broadened the perspective for molecularly targeted
therapies.