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2016 ; 7
(41
): 66728-66739
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Coupling of LETM1 up-regulation with oxidative phosphorylation and
platelet-derived growth factor receptor signaling via YAP1 transactivation
#MMPMID27556512
Lee J
; Lee WK
; Seol MY
; Lee SG
; Kim D
; Kim H
; Park J
; Jung SG
; Chung WY
; Lee EJ
; Jo YS
Oncotarget
2016[Oct]; 7
(41
): 66728-66739
PMID27556512
show ga
Persistent cellular proliferation and metabolic reprogramming are essential
processes in carcinogenesis. Here, we performed Gene Set Enrichment Analysis
(GSEA) and found that that LETM1, a mitochondrial calcium transporter, is
associated with cellular growth signals such as platelet-derived growth factor
(PDGF) receptor signaling and insulin signaling pathways. These results were then
verified by qRT-PCR and immnunoblotting. Mechanistically, up-regulation of LETM1
induced YAP1 nuclear accumulation, increasing the expression of PDGFB, PDGFRB and
THBS4. Consistent with this, LETM1 silencing caused loss of YAP1 nuclear signal,
decreasing the expression of PDGFB, PDGFRB and THBS4. Immunohistochemical
staining consistently indicated a positive association between LETM1
up-regulation, YAP1 nuclear localization and high PDGFB expression. In clinical
data analysis, LETM1 up-regulation in thyroid cancer was found to be related to
aggressive tumor features such as lymphovascular invasion (LVI, P < 0.001) and
lymph node metastasis (LNM, P = 0.011). Multivariate analysis demonstrated that
LETM1 up-regulation increases the risk of LVI and LNM (OR = 3.455, 95% CI =
1.537-7.766 and OR = 3.043, 95% CI = 1.282-7.225, respectively). Collectively,
these data suggest that up-regulation of LETM1 induces sustained activation of
proliferative signaling pathways, such as PDGF signal pathway by AKT induced YAP1
transactivation, resulting in aggressive thyroid cancer phenotypes.
|*Oxidative Phosphorylation
[MESH]
|*Up-Regulation
[MESH]
|Adaptor Proteins, Signal Transducing/genetics/*metabolism
[MESH]