Peritoneal injection of fucoidan suppresses the increase of plasma IgE induced by OVA-sensitization.
We previously reported that fucoidan, a dietary fiber purified from seaweed, inhibited IgE production by B cells in vitro. In this study, we examined the effect of fucoidan on IgE production in vivo. The OVA-induced increase of plasma IgE was significantly suppressed when fucoidan was intraperitoneally, but not orally, administered prior to the first immunization with OVA. The production of IL-4 and IFN-gamma in response to OVA in spleen cells isolated from OVA-sensitized mice treated with fucoidan in vivo was lower than that from mice treated without fucoidan. Moreover, the flow cytometric analysis and ELISpot assay revealed that the administration of fucoidan suppressed a number of IgE-expressing and IgE-secreting B cells, respectively. These results indicate that fucoidan inhibits the increase of plasma IgE through the suppression of IgE-producing B cell population, and the effect of fucoidan in vivo is crucially dependent on the route and timing of its administration.
Yanase
Yuhki
Y
Department of Dermatology, Division of Molecular Medical Science, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3, Kasumi, Minami-ku, Hiroshima, Japan.
Hiragun
Takaaki
T
Uchida
Kazue
K
Ishii
Kaori
K
Oomizu
Souichi
S
Suzuki
Hidenori
H
Mihara
Shoji
S
Iwamoto
Kazumasa
K
Matsuo
Hiroaki
H
Onishi
Nobukazu
N
Kameyoshi
Yoshikazu
Y
Hide
Michihiro
M
D000818:Animals; D001402:B-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D005260:Female; D007073:Immunoglobulin E / Q000097:blood*; D007165:Immunosuppression Therapy; D007274:Injections, Intraperitoneal; D007371:Interferon-gamma / Q000276:immunology; D015847:Interleukin-4 / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D010047:Ovalbumin / Q000276:immunology; D011134:Polysaccharides / Q000008:administration & dosage*
D011134:Polysaccharides; D015847:Interleukin-4; D007073:Immunoglobulin E; D007371:Interferon-gamma; D010047:Ovalbumin; C007789:fucoidan