title: Oenothein B, a cyclic dimeric ellagitannin isolated from Epilobium angustifolium, enhances IFNγ production by lymphocytes.
abstract: Oenothein B is a polyphenol isolated from Epilobium angustifolium and other plant sources, which has been reported to exhibit immunomodulatory properties. Oenothein B is known to activate myeloid cells and induce the production of IL-1 and other cytokines. However, its effects on lymphocytes are unknown. In this report, we show that oenothein B stimulated innate lymphocytes, including bovine and human γδ T cells and NK cells, resulting in either increased CD25 and/or CD69 expression. We also demonstrate that oenothein B enhanced the production of interferon-γ (IFNγ) by bovine and human NK cells alone and in combination with interleukin-18 (IL-18), a response not observed with other commonly studied polyphenols. Furthermore, we demonstrate that oenothein B enhanced the production of IFNγ by human T cells. Since IFNγ contributes to antitumor, antibacterial, and antiviral cell responses, these data suggest an additional mechanism that could account, at least in part, for the immune enhancing properties of oenothein B.
authors.affiliation: Department of Immunology and Infectious Diseases, Montana State University, Bozeman, Montana, United States of America.
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Ramstead
authors.forename: Igor A
authors.initials: IA
authors.lastname: Schepetkin
authors.forename: Mark T
authors.initials: MT
authors.lastname: Quinn
authors.forename: Mark A
authors.initials: MA
authors.lastname: Jutila
mesh_terms: D000818:Animals; D002417:Cattle; D019281:Dimerization; D031666:Epilobium / Q000737:chemistry*; D006801:Humans; D047348:Hydrolyzable Tannins / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D007113:Immunity, Innate / Q000187:drug effects; D007155:Immunologic Factors / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D007371:Interferon-gamma / Q000096:biosynthesis*; D020382:Interleukin-18 / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism; D055627:Natural Cytotoxicity Triggering Receptor 1 / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000187:drug effects* / Q000276:immunology / Q000378:metabolism
chemical_list: D047348:Hydrolyzable Tannins; D007155:Immunologic Factors; D020382:Interleukin-18; D055627:Natural Cytotoxicity Triggering Receptor 1; C080077:oenothein B; D007371:Interferon-gamma