Administration of plasmacytoid dendritic cell-stimulative lactic acid bacteria enhances antigen-specific immune responses

Biochemical and Biophysical Research Communications
Hiroaki SuzukiDaisuke Fujiwara

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 re...Continue Reading

Citations

Jun 28, 2020·The Journal of Immunology : Official Journal of the American Association of Immunologists·Hiroaki SuzukiYuji Morita
Nov 6, 2020·Evidence-based Complementary and Alternative Medicine : ECAM·Takeshi YamamotoMakoto Kadowaki

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