alexa Muramyl dipeptide-Lys stimulates the function of human dendritic cells.
Food & Nutrition

Food & Nutrition

Journal of Probiotics & Health

Author(s): Todate A, Suda T, Kuwata H, Chida K, Nakamura H

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Abstract Muramyl dipeptide (MDP)-Lys (L18), a synthetic MDP analogue derived from bacterial cell walls, has been reported to be a potent immunoadjuvant that enhances protective immunity against pathogens and tumors by stimulating immune-competent cells, such as monocytes and macrophages. However, it is not known whether MDP-Lys modulates the function of dendritic cells (DCs), which are the most potent antigen-presenting cells and play a crucial role in initiating T cell-mediated immunity. Therefore, we examined the effects of MDP-Lys on the expression of surface molecules, cytokine production, and antigen-presenting function of human DCs generated from peripheral blood cells in the presence of interleukin (IL)-4 and granulocyte-macrophage colony-stimulating factor. We found that MDP-Lys markedly up-regulated the expression of CD80, CD83, CD86, and CD40, but not human leukocyte antigen-DR, and stimulated the production of tumor necrosis factor-alpha, IL-6, IL-8, IL-10, and IL-12 (p40) by human DCs in a dose-dependent manner. Furthermore, MDP-Lys-treated DCs showed enhanced antigen-presenting function compared with untreated DCs, as assessed by an allogeneic mixed lymphocyte reaction. These results suggested that the immunoadjuvant activity of MDP-Lys in vivo is mediated, in part, by its stimulation of DC function.
This article was published in J Leukoc Biol and referenced in Journal of Probiotics & Health

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