Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/109741
Title: γ-tocotrienol inhibits angiogenesis-dependent growth of human hepatocellular carcinoma through abrogation of AKT/mTOR pathway in an orthotopic mouse model
Authors: Siveen, K.S.
Ahn, K.S.
Ong, T.H.
Shanmugam, M.K. 
Li, F.
Yap, W.N.
Kumar, A.P. 
Fong, C.W.
Tergaonkar, V.
Hui, K.M. 
Sethi, G.
Keywords: AKT/mTOR
Angiogenesis
HCC
Orthotopic model
γ-tocotrienol
Issue Date: 2014
Citation: Siveen, K.S.,Ahn, K.S.,Ong, T.H.,Shanmugam, M.K.,Li, F.,Yap, W.N.,Kumar, A.P.,Fong, C.W.,Tergaonkar, V.,Hui, K.M.,Sethi, G. (2014). γ-tocotrienol inhibits angiogenesis-dependent growth of human hepatocellular carcinoma through abrogation of AKT/mTOR pathway in an orthotopic mouse model. Oncotarget 5 (6) : 1897-1911. ScholarBank@NUS Repository.
Abstract: Angiogenesis is one of the key hallmarks of cancer. In this study, we investigated whether γ-tocotrienol can abrogate angiogenesis-mediated tumor growth in hepatocellular carcinoma (HCC) and if so, through what molecular mechanisms. We observed that γ-tocotrienol inhibited vascular endothelial growth factor (VEGF)-induced migration, invasion, tube formation and viability of HUVECs in vitro. Moreover, γ-tocotrienol reduced the number of capillary sprouts from matrigel embedded rat thoracic aortic ring in a dose-dependent manner. Also, in chick chorioallantoic membrane assay, γ-tocotrienol significantly reduced the blood vessels formation. We further noticed that γ-tocotrienol blocked angiogenesis in an in vivo matrigel plug assay. Furthermore, γ-tocotrienol inhibited VEGF-induced autophosphorylation of VEGFR2 in HUVECs and also suppressed the constitutive activation of AKT/mammalian target of rapamycin (mTOR) signal transduction cascades in HUVECs as well as in HCC cells. Interestingly, γ-tocotrienol was also found to significantly reduce the tumor growth in an orthotopic HCC mouse model and inhibit tumor-induced angiogenesis in HCC patient xenografts through the suppression of various biomarkers of proliferation and angiogenesis. Taken together, our findings strongly suggest that γ-tocotrienol might be a promising anti-angiogenic drug with significant antitumor activity in HCC.
Source Title: Oncotarget
URI: http://scholarbank.nus.edu.sg/handle/10635/109741
ISSN: 19492553
Appears in Collections:Staff Publications

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