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2014 ; 42
(18
): 11589-600
Nephropedia Template TP
gab.com Text
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English Wikipedia
Non-metastatic 2 (NME2)-mediated suppression of lung cancer metastasis involves
transcriptional regulation of key cell adhesion factor vinculin
#MMPMID25249619
Thakur RK
; Yadav VK
; Kumar A
; Singh A
; Pal K
; Hoeppner L
; Saha D
; Purohit G
; Basundra R
; Kar A
; Halder R
; Kumar P
; Baral A
; Kumar MJ
; Baldi A
; Vincenzi B
; Lorenzon L
; Banerjee R
; Kumar P
; Shridhar V
; Mukhopadhyay D
; Chowdhury S
Nucleic Acids Res
2014[Oct]; 42
(18
): 11589-600
PMID25249619
show ga
Tumor metastasis refers to spread of a tumor from site of its origin to distant
organs and causes majority of cancer deaths. Although >30 metastasis suppressor
genes (MSGs) that negatively regulate metastasis have been identified so far, two
issues are poorly understood: first, which MSGs oppose metastasis in a tumor
type, and second, which molecular function of MSG controls metastasis. Herein,
integrative analyses of tumor-transcriptomes (n=382), survival data (n=530) and
lymph node metastases (n=100) in lung cancer patients identified non-metastatic 2
(NME2) as a key MSG from a pool of >30 metastasis suppressors. Subsequently, we
generated a promoter-wide binding map for NME2 using chromatin
immunoprecipitation with promoter microarrays (ChIP-chip), and transcriptome
profiling. We discovered novel targets of NME2 which are involved in focal
adhesion signaling. Importantly, we detected binding of NME2 in promoter of focal
adhesion factor, vinculin. Reduced expression of NME2 led to enhanced
transcription of vinculin. In comparison, NME1, a close homolog of NME2, did not
bind to vinculin promoter nor regulate its expression. In line, enhanced
metastasis of NME2-depleted lung cancer cells was found in zebrafish and nude
mice tumor models. The metastatic potential of NME2-depleted cells was remarkably
diminished upon selective RNA-i-mediated silencing of vinculin. Together, we
demonstrate that reduced NME2 levels lead to transcriptional de-repression of
vinculin and regulate lung cancer metastasis.