title: Characteristic Immune Response in Peyer's Patch Cells Induced by Oral Administration of Bifidobacterium Components.
abstract: We demonstrate immunomodulatory effects, especially those involving murine intestinal IgA secretion, in Peyer's patch cells following oral administration of Bifidobacterium immunomodulator (BIM) derived from sonicated B. pseudocatenulatum 7041. BALB/c mice were administered BIM orally for 7 consecutive days. The PP cells demonstrated upregulated secretion of total IgA including BIM-specific IgA following BIM administration. In observing the response of PP cells co-cultured with BIM, we found enhanced secretion of interferon-gamma (IFN-gamma) and interleukin (IL)-6 in the CD4(+) T cells. In contrast, IL-12 secretion by Thy1.2(-) PP cells was enhanced, but secretion of IFN-gamma, IL-5, and IL-6 was not significantly affected. Furthermore, the population of CD4(+) CD45RB(high) T cells in PP increased following oral administration of BIM. These data suggest that CD4(+) T cells were affected by BIM administration. Overall, the results show that oral administration of BIM induced CD4(+) PP cells to change their expression of cell surface antigen and cytokine production.
authors.affiliation: Department of Food Science and Technology, College of Bioresource Sciences, Nihon University, 1866, Kameino, Fujisawa-shi, Kanagawa, 252-8510, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakanishi
authors.forename: Akira
authors.initials: A
authors.lastname: Hosono
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Hiramatsu
authors.forename: Teiji
authors.initials: T
authors.lastname: Kimura
authors.forename: Ryo
authors.initials: R
authors.lastname: Nakamura
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kaminogawa