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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43578

Title: Low molecular weight fucoidan inhibits tumor angiogenesis through downregulation of HIF-1α/VEGF signaling under hypoxia
Authors: Meng-Chuan Chen;Wen-Lin Hsu;Pai-An Hwang;Tz-Chong Chou
Contributors: 國立臺灣海洋大學:生命科學系
Keywords: low molecular weight fucoidan;angiogenesis;hypoxia-inducible factor 1 alpha;vascular endothelial growth factor;bladder cancer
Date: 2015-07-17
Issue Date: 2017-10-05T07:23:22Z
Publisher: Mar Drugs
Abstract: Abstract:Activation of hypoxia-induced hypoxia-inducible factors-1 (HIF-1) plays a critical role in promoting tumor angiogenesis, growth and metastasis. Low molecular weight fucoidan (LMWF) is prepared from brown algae, and exhibits anticancer activity. However, whether LMWF attenuates hypoxia-induced angiogenesis in bladder cancer cells and the molecular mechanisms involved remain unclear. This is the first study to demonstrate that LMWF can inhibit hypoxia-stimulated H2O2 formation, HIF-1 accumulation and transcriptional activity vascular endothelial growth factor (VEGF) secretion, and the migration and invasion in hypoxic human bladder cancer cells (T24) cells. LMWF also downregulated hypoxia-activated phosphorylation of PI3K/AKT/mTOR/p70S6K/4EBP-1 signaling in T24 cells. Blocking PI3K/AKT or mTOR activity strongly diminished hypoxia-induced HIF-1α expression and VEGF secretion in T24 cells, supporting the involvement of PI3K/AKT/mTOR in the induction of HIF-1α and VEGF. Additionally, LMWF significantly attenuated angiogenesis in vitro and in vivo evidenced by reduction of tube formation of hypoxic human umbilical vascular endothelial cells and blood capillary generation in the tumor. Similarly, administration of LMWF also inhibited the HIF-1α and VEGF expression in vivo, accompanied by a reduction of tumor growth. In summary, under hypoxia conditions, the antiangiogenic activity of LMWF in bladder cancer may be associated with suppressing HIF-1/VEGF-regulated signaling pathway.
Relation: 13(7): 4436–4451
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/43578
Appears in Collections:[生命科學系] 期刊論文

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