Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia
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 angiog...
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doaj-2381cc0db66b4f649f01e1f39bf723082020-11-24T23:19:38ZengMDPI AGMarine Drugs1660-33972015-07-011374436445110.3390/md13074436md13074436Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under HypoxiaMeng-Chuan Chen0Wen-Lin Hsu1Pai-An Hwang2Tz-Chong Chou3Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei 11483, TaiwanSchool of Medicine, Tzu Chi University, Hualien 97002, TaiwanSeafood Technology Division, Fisheries Research Institute, Council of Agriculture, Keelung 20246, TaiwanGraduate Institute of Medical Sciences, National Defense Medical Center, Taipei 11483, TaiwanActivation 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.http://www.mdpi.com/1660-3397/13/7/4436low molecular weight fucoidanangiogenesishypoxia-inducible factor 1 alphavascular endothelial growth factorbladder cancer |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Meng-Chuan Chen Wen-Lin Hsu Pai-An Hwang Tz-Chong Chou |
spellingShingle |
Meng-Chuan Chen Wen-Lin Hsu Pai-An Hwang Tz-Chong Chou Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia Marine Drugs low molecular weight fucoidan angiogenesis hypoxia-inducible factor 1 alpha vascular endothelial growth factor bladder cancer |
author_facet |
Meng-Chuan Chen Wen-Lin Hsu Pai-An Hwang Tz-Chong Chou |
author_sort |
Meng-Chuan Chen |
title |
Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia |
title_short |
Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia |
title_full |
Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia |
title_fullStr |
Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia |
title_full_unstemmed |
Low Molecular Weight Fucoidan Inhibits Tumor Angiogenesis through Downregulation of HIF-1/VEGF Signaling under Hypoxia |
title_sort |
low molecular weight fucoidan inhibits tumor angiogenesis through downregulation of hif-1/vegf signaling under hypoxia |
publisher |
MDPI AG |
series |
Marine Drugs |
issn |
1660-3397 |
publishDate |
2015-07-01 |
description |
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. |
topic |
low molecular weight fucoidan angiogenesis hypoxia-inducible factor 1 alpha vascular endothelial growth factor bladder cancer |
url |
http://www.mdpi.com/1660-3397/13/7/4436 |
work_keys_str_mv |
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