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Int. J. Mol. Sci. 2013, 14(1), 46-56; doi:10.3390/ijms14010046

Immunological Effects of Oenothein B, an Ellagitannin Dimer, on Dendritic Cells

1,* , 2
1 College of Pharmaceutical Sciences, Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, Ehime 790-8578, Japan 2 National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagayaku, Tokyo 158-8501, Japan
* Author to whom correspondence should be addressed.
Received: 11 October 2012 / Revised: 11 December 2012 / Accepted: 12 December 2012 / Published: 20 December 2012
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Oenothein B is a unique macrocyclic ellagitannin dimer that has been found in various medicinal plants belonging to Onagraceae, Lythraceae, and Myrtaceae, with diverse biological activities. The immunological effects of tannins in terms of cytokine-release from macrophages and monocytes have been discussed, while the effects on other immunocompetent cells have been the subject of minimal investigation. We evaluated the immunomodulatory effects induced by tannin treatment in human dendritic cells (DCs), which play a critical role in the initial immune response, by measuring the changes in cytokine production, cell differentiation, and cell viability. Oenothein B showed significant down-regulation of the expression of cell surface molecules, CD1a and CD83, suggesting the inhibition of DC differentiation and/or maturation. The suppressive effect on DCs was associated with the induction of apoptosis without the activation of caspase-3/7, 8, and 9, and this was supported by the morphological features indicating significant nuclear condensation. Oenothein B also markedly suppressed the production of inflammatory cytokines, such as IL-1β and IL-6, in a dose-dependent manner. These data may, in part, be able to explain the traditional use of tannin-containing medicinal plants for the treatment of a variety of inflammatory diseases, including inflammatory bowel disease, celiac disease, and rheumatoid arthritis.
Keywords: dendritic cell; oenothein B; epigallocatechin gallate; cytokine; caspase dendritic cell; oenothein B; epigallocatechin gallate; cytokine; caspase
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yoshimura, M.; Akiyama, H.; Kondo, K.; Sakata, K.; Matsuoka, H.; Amakura, Y.; Teshima, R.; Yoshida, T. Immunological Effects of Oenothein B, an Ellagitannin Dimer, on Dendritic Cells. Int. J. Mol. Sci. 2013, 14, 46-56.

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