RAD001 targeted HUVECs reverses 12-lipoxygenase-induced angiogenesis in oesophageal squamous cell carcinoma.

Journal of Cellular and Molecular Medicine
Xue ChenYufeng Cheng

Abstract

12-LOX plays an important role in the progression of various malignancies. However, the underlying mechanisms of the action of 12-LOX and tumour treatment strategies remain not fully defined. In this study, we investigated the possible roles of 12-LOX in ESCC and explored the new therapeutic target. Approximately 73% of ESCC tissues showed marked up-regulation of 12-LOX, which was associated with poor prognosis. 12-LOX overexpression was positively correlated with the malignant progression of ESCC as demonstrated both in vitro and in vivo. Up-regulation of 12-LOX significantly increased the proliferation of ESCC cells and the xenograft volume. Moreover, 12-LOX up-regulation promoted tube formation of HUVECs and tumour angiogenesis in xenografts. Mechanism investigation indicated that 12-LOX overexpression led to activation of the PI3K/AKT/mTOR pathway and the up-regulation of VEGF in ESCC cells. Subsequent analysis indicated that the RAD001 could reverse the 12-LOX-induced promoting effect on ESCC. Specifically, the application of RAD001 inhibited the proliferation of ESCC cells and the tube-forming ability of HUVECs. In the drug group, the xenografts exhibited significant volume reduction and angiogenesis inhibition. We demons...Continue Reading

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