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2015 ; 6
(32
): 33237-52
Nephropedia Template TP
gab.com Text
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English Wikipedia
An epigenetic auto-feedback loop regulates TGF-? type II receptor expression and
function in NSCLC
#MMPMID26356817
Yang S
; Cho YJ
; Jin L
; Yuan G
; Datta A
; Buckhaults P
; Datta PK
Oncotarget
2015[Oct]; 6
(32
): 33237-52
PMID26356817
show ga
The downregulation of transforming growth factor-? (TGF-?) type II receptor
(T?RII) expression and function plays a pivotal role in the loss of the
TGF-?-induced tumor suppressor function that contributes to lung cancer
progression. The aberrant expression of miRNAs has been shown to be involved in
the regulation of oncogenes and tumor suppressor genes. Our current study
involving miRNA microarray, northern blot and QRT-PCR analysis shows an inverse
correlation between miR-20a and T?RII expression in non-small cell lung cancer
(NSCLC) tissues and cell lines. Stable expression of miR-20a downregulates T?RII
in lung epithelial cells which results in an inhibition of TGF-? signaling and
attenuation of TGF-?-induced cell growth suppression and apoptosis. Stable knock
down of miR-20a increases T?RII expression and inhibits tumorigenicity of lung
cancer cells in vivo. Oncogene c-Myc promotes miR-20a expression by activating
its promoter leading to downregulation of T?RII expression and TGF-ß signaling.
MiR-145, which is upregulated by TGF-?, inhibits miR-20a expression by targeting
c-Myc and upregulates T?RII expression. These correlations among miRNAs and
cellular proteins are supported by TCGA public database using NSCLC specimens.
These results suggest a novel mechanism for the loss of T?RII expression and
TGF-?-induced tumor suppressor functions in lung cancer through a complex
auto-feedback loop TGF-?/miR-145/c-Myc/miR-20a/T?RII.