Volume 123, Issue 11 pp. 2702-2712
Cancer Therapy

Antiadult T-cell leukemia effects of brown algae fucoxanthin and its deacetylated product, fucoxanthinol

Chie Ishikawa

Chie Ishikawa

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Division of Child Health and Welfare, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

The Japanese Society for the Promotion of Science (JSPS), Tokyo, Japan

Search for more papers by this author
Senji Tafuku

Senji Tafuku

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Tropical Technology Center Ltd, Uruma, Okinawa, Japan

Search for more papers by this author
Takashi Kadekaru

Takashi Kadekaru

Tropical Technology Center Ltd, Uruma, Okinawa, Japan

Search for more papers by this author
Shigeki Sawada

Shigeki Sawada

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Division of Oral and Maxillofacial Functional Rehabilitation, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Search for more papers by this author
Mariko Tomita

Mariko Tomita

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Search for more papers by this author
Taeko Okudaira

Taeko Okudaira

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Division of Endocrinology and Metabolism, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Search for more papers by this author
Tetsuro Nakazato

Tetsuro Nakazato

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Division of Endocrinology and Metabolism, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Search for more papers by this author
Takayoshi Toda

Takayoshi Toda

Division of Laboratory Medicine, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Search for more papers by this author
Jun-Nosuke Uchihara

Jun-Nosuke Uchihara

Department of Internal Medicine, Naha City Hospital, Naha, Okinawa, Japan

Search for more papers by this author
Naoya Taira

Naoya Taira

Department of Internal Medicine, Heartlife Hospital, Nakagusuku, Okinawa, Japan

Search for more papers by this author
Kazuiku Ohshiro

Kazuiku Ohshiro

Department of Internal Medicine, Okinawa Prefectural Nanbu Medical Center and Children's Medical Center, Haebaru, Okinawa, Japan

Search for more papers by this author
Takeshi Yasumoto

Takeshi Yasumoto

Tropical Technology Center Ltd, Uruma, Okinawa, Japan

Search for more papers by this author
Takao Ohta

Takao Ohta

Division of Child Health and Welfare, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Search for more papers by this author
Naoki Mori

Corresponding Author

Naoki Mori

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan

Fax: +81-98-895-1410.

Division of Molecular Virology and Oncology, Graduate School of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215, JapanSearch for more papers by this author
First published: 16 September 2008
Citations: 108

Abstract

Adult T-cell leukemia (ATL) is a fatal malignancy of T lymphocytes caused by human T-cell leukemia virus type 1 (HTLV-1) infection and remains incurable. Carotenoids are a family of natural pigments and have several biological functions. Among carotenoids, fucoxanthin is known to have antitumorigenic activity, but the precise mechanism of action is not elucidated. We evaluated the anti-ATL effects of fucoxanthin and its metabolite, fucoxanthinol. Both carotenoids inhibited cell viability of HTLV-1-infected T-cell lines and ATL cells, and fucoxanthinol was approximately twice more potent than fucoxanthin. In contrast, other carotenoids, β-carotene and astaxanthin, had mild inhibitory effects on HTLV-1-infected T-cell lines. Importantly, uninfected cell lines and normal peripheral blood mononuclear cells were resistant to fucoxanthin and fucoxanthinol. Both carotenoids induced cell cycle arrest during G1 phase by reducing the expression of cyclin D1, cyclin D2, CDK4 and CDK6, and inducing the expression of GADD45α, and induced apoptosis by reducing the expression of Bcl-2, XIAP, cIAP2 and survivin. The induced apoptosis was associated with activation of caspase-3, -8 and -9. Fucoxanthin and fucoxanthinol also suppressed IκBα phosphorylation and JunD expression, resulting in inactivation of nuclear factor-κB and activator protein-1. Mice with severe combined immunodeficiency harboring tumors induced by inoculation of HTLV-1-infected T cells responded to treatment with fucoxanthinol with suppression of tumor growth, showed extensive tissue distribution of fucoxanthinol, and the presence of therapeutically effective serum concentrations of fucoxanthinol. Our preclinical data suggest that fucoxanthin and fucoxanthinol could be potentially useful therapeutic agents for patients with ATL. © 2008 Wiley-Liss, Inc.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.