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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Oncotarget 2016 ; 7 (4): 4252-64 Nephropedia Template TP
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Upregulation of flotillin-1 promotes invasion and metastasis by activating TGF-? signaling in nasopharyngeal carcinoma #MMPMID26646322
Cao S; Cui Y; Xiao H; Mai M; Wang C; Xie S; Yang J; Wu S; Li J; Song L; Guo X; Lin C
Oncotarget 2016[Jan]; 7 (4): 4252-64 PMID26646322show ga
Metastasis is the main cause of cancer-related deaths. Nasopharyngeal carcinoma (NPC) is characterized by severe local invasion and high incidence of regional lymph node metastasis, which represents poor prognosis. However, the underlying mechanism that induces lymph node metastasis of NPC remains largely unknown. Herein, we report that flotillin-1 (FLOT1), a component of lipid raft, which was reported to be involved in tumor progression, was robustly upregulated in the NPC samples with lymph node metastasis. High FLOT1 expression was significantly associated with N classification as well as poorer overall and disease-free survivals in 169 archived clinical NPC samples. Overexpression of FLOT1 enhanced the migratory and invasive abilities of NPC cells in vitro, and more importantly, promoted invasion into the surrounding tissues and metastasis to lymph nodes in vivo. Whereas silencing of endogenous FLOT1 in NPC cells decreased the local invasion and metastasis to lymph nodes. Furthermore, FLOT1 induced the expression and secretion of TGF-?1, facilitated the activation of TGF-?/Smad3 signaling to effectuate epithelial-mesenchymal transition. Our findings present new evidence that FLOT1 plays an important role in promoting aggressive behavior of NPC and provide new insights into the regulatory mechanism of TGF-? signaling.