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Food Chem Toxicol. 2014 Feb;64:344-52. doi: 10.1016/j.fct.2013.12.009. Epub 2013 Dec 12.

AKT signaling is involved in fucoidan-induced inhibition of growth and migration of human bladder cancer cells.

Author information

1
Department of Biotechnology, Chungju National University, Chungju, Chungbuk 380-702, Republic of Korea.
2
Department of Urology, Chungbuk National University College of Medicine, Cheongju, Chungbuk 361-763, Republic of Korea.
3
School of Food Science and Technology, Chung-Ang University, Anseong 456-756, Republic of Korea. Electronic address: sumoon66@dreamwiz.com.

Abstract

We identified a novel mechanism of AKT signaling in the fucoidan-induced proliferation and migration of human urinary 5637 cancer cells. Fucoidan treatment showed a significant growth inhibition followed by G1-phase-associated up-regulation of p21WAF1 expression and suppression of cyclins and CDK expression in 5637 cells. Also, fucoidan treatment induced the activation of AKT signaling, which was inhibited by treatment with wortmannin, a PI3K-specific inhibitor. Blockade of the AKT function reversed the fucoidan-mediated inhibition of cell proliferation, the increased G1-phase-associated p21WAF1 expression, and the reduction of cell-cycle proteins. Moreover, treatment with fucoidan blocked migration and invasion of 5637 cells. This inhibition was attributed to decreased expression of MMP-9, which was mediated by down-regulation of AP-1 and NF-κB binding activity. Furthermore, wortmannin treatment abolished the decreased cell migration and invasion and the inhibition of MMP-9 expression via the suppression of NF-κB and AP-1 in fucoidan-treated cells. Similar results were observed in another bladder cancer T-24 cells treated with fucoidan. Finally, overexpression of the AKT gene inhibited the proliferation, migration and invasion of bladder cancer cells. These data suggest that the activation of AKT signaling is involved in growth inhibition and suppression of the migration and invasion of bladder cancer cells treated with fucoidan.

KEYWORDS:

AKT; Bladder cancer cells; Fucoidan; G1-phase cell cycle arrest; Migration; p21WAF1

PMID:
24333868
DOI:
10.1016/j.fct.2013.12.009
[Indexed for MEDLINE]

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