| Literature DB >> 20493172 |
Akira Shibata1, Kiyotaka Nakagawa, Phumon Sookwong, Tsuyoshi Tsuduki, Akira Asai, Teruo Miyazawa.
Abstract
Recent studies have demonstrated that tocotrienol (T3) is superior to tocopherol (Toc) for cancer chemoprevention. However, there is little information on whether Toc influences the anticancer property of T3. In this study, we investigated the influence of Toc on the cytotoxic effects of delta-T3 in DLD-1 human colorectal adenocarcinoma cells. Toc, especially alpha-Toc, attenuated delta-T3-induced cytotoxicity and apoptosis in DLD-1 cells, whereas Toc alone did not exhibit any cytotoxic effect. delta-T3-induced cell cycle arrest and proapoptotic gene/protein expression (e.g., p21, p27, and caspases) were abrogated by alpha-Toc. Furthermore, coadministration of alpha-Toc decreased delta-T3 uptake into DLD-1 cells in a dose-dependent manner. These results indicate that alpha-Toc is not only less cytotoxic to cancer cells, but it also reduces the cytotoxicity of delta-T3 by inhibiting its cellular uptake. Copyright (c) 2010 Elsevier Inc. All rights reserved.Entities:
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Year: 2010 PMID： 20493172 DOI： 10.1016/j.bbrc.2010.05.087
Source DB: PubMed Journal: Biochem Biophys Res Commun ISSN： 0006-291X Impact factor: 3.575