Campylobacter jejuni induces maturation and cytokine production in human dendritic cells.

Infection and Immunity
Lan HuD J Kopecko

Abstract

Campylobacter jejuni is a leading bacterial cause of human diarrheal disease in both developed and developing nations. Colonic mucosal invasion and the resulting host inflammatory responses are thought to be the key contributing factors to the dysenteric form of this disease. Dendritic cells (DCs) play an important role in both the innate and adaptive immune responses to microbial infection. In this study, the interaction between human monocyte-derived dendritic cells and C. jejuni was studied. We found that C. jejuni was readily internalized by DCs over a 2-h period. However, after a prolonged infection period (24 or 48 h) with C. jejuni, only a few viable bacteria remained intracellularly. Minimal cytotoxicity of C. jejuni to dendritic cells was observed. C. jejuni induced the maturation of dendritic cells over 24 h, as indicated by up-regulation of cell surface marker proteins CD40, CD80, and CD86. In addition, Campylobacter-infected DCs triggered activation of NF-kappaB and significantly stimulated production of interleukin-1beta (IL-1beta), IL-6, IL-8, IL-10, IL-12, gamma interferon, and tumor necrosis factor alpha (TNF-alpha) compared to uninfected DCs. Active bacterial invasion of DCs was not necessary for the induction ...Continue Reading

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