Lentinan from shiitake mushroom (Lentinus edodes) suppresses expression of cytochrome P450 1A subfamily in the mouse liver

Issue title: The Proceedings of the 3rd International Conference on Food Factors (ICoFF 03)

Article type: Research Article

Authors: Okamoto, Takashi | Kodoi, Rie | Nonaka, Yuji | Fukuda, Itsuko | Hashimoto, Takashi | Kanazawa, Kazuki | Mizuno, Masashi | Ashida, Hitoshi

Affiliations: Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Rokkodai-cho 1, Nada-ku, Kobe 657-8501, Japan | Department of Plant Resource Science, Faculty of Agriculture, Kobe University, Rokkodai-cho 1, Nada-ku, Kobe 657-8501, Japan

Note: [] Corresponding author. Tel./Fax: +81 78 803 5878; E-mail, [email protected]

Abstract: Induction of xenobiotics metabolizing enzymes is related to the formation and chemoprevention of cancer. Since cytochrome P450s (CYPs) including CYP1A subfamily metabolize certain pro-carcinogens to their ultimate forms, down-regulation of CYP1As by food factors leads to the prevention of cancer. Mushroom polysaccharides, especially β-glucans such as lentinan from Lentinus edodes, possess the anti-tumor and immunomodulating activities through the cytokine production from immunocytes. Recent our studies have demonstrated that lentinan suppresses hepatic CYP1As expression in the both constitutive and inducible levels through the production of tumor necrosis factor-α and an increase in the DNA-binding activity of nuclear factor-κB. This paper discusses on the effective lentinan dosage and route of administration for suppression of CYP1As.

Keywords: lentinan, CYP1A subfamily, TNF-α, NF-κB

Journal: BioFactors, vol. 21, no. 1-4, pp. 407-409, 2004