RRC ID 55110
Author Suzuki H, Jounai K, Ohshio K, Fujii T, Fujiwara D.
Title Administration of plasmacytoid dendritic cell-stimulative lactic acid bacteria enhances antigen-specific immune responses.
Journal Biochem. Biophys. Res. Commun.
Abstract Lactic acid bacteria (LAB) have been reported to have beneficial effects on protective immunity against viruses and pathogenic bacteria by activating innate immune cells such as dendritic cells (DC) or macrophages. However, little is known about whether LAB contributes to antigen-specific immune responses. Because plasmacytoid DC (pDC) links innate and acquired immunity, here we investigated whether the pDC-stimulative LAB, Lactococcus lactis strain Plasma (LC-Plasma), influences antigen-specific immune responses. In in vitro co-culture experiments, LC-Plasma enhanced the expression of MHC class I and II, and CD80 and CD86 on both pDC and conventional DC, and this enhancement was abolished by treatment with a Toll-like receptor 9 antagonist. A subsequent in vitro study showed that LC-Plasma increased antigen-specific T cell responses via DC activation. In mice, oral administration of LC-Plasma in combination with intraperitoneal antigen administration enhanced the percentage of antigen-specific CD8+ T cells and the amount of antigen-specific IgG. Furthermore, continuous intake of LC-Plasma increased T helper 1 responses, which contribute to antigen-specific cellular and humoral immune responses. Taken together, these results reveal that the oral intake of pDC-stimulative LAB enhances antigen-specific immune responses.
Volume 503(3)
Pages 1315-1321
Published 2018-9-10
DOI 10.1016/j.bbrc.2018.07.042
PII S0006-291X(18)31537-7
PMID 30007441
MeSH Animals Antigens / immunology* Cells, Cultured Coculture Techniques Dendritic Cells / immunology* Immunity, Innate* Lactobacillales / immunology* Mice Mice, Inbred C57BL
Resource
General Microbes JCM 5805