Vibrio vulnificus infection induces the maturation and activation of dendritic cells with inflammatory Th17-polarizing ability

Lee,Arim; Lim,Hui Xuan; Kim,Myun Soo; Cho,Daeho; Jang,Kyung Ku; Choi,Sang Ho; Kim,Tae Sung

doi:10.3892/ijmm.2017.3230

Vibrio vulnificus infection induces the maturation and activation of dendritic cells with inflammatory Th17-polarizing ability

Authors:
- Arim Lee
- Hui Xuan Lim
- Myun Soo Kim
- Daeho Cho
- Kyung Ku Jang
- Sang Ho Choi
- Tae Sung Kim
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Affiliations: Department of Life Sciences, College of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea, Department of Life Science, Sookmyung Women's University, Seoul 140-742, Republic of Korea, National Research Laboratory of Molecular Microbiology and Toxicology, Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea
Published online on: November 1, 2017 https://doi.org/10.3892/ijmm.2017.3230
Pages: 531-540

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Abstract

Vibrio vulnificus (V. vulnificus) is a gram-negative bacterium, which causes life-threatening septicemia and gastroenteritis through the consumption of contaminated seafood or wound infection. In addition, V. vulnificus infection is known to stimulate the production of several pro-inflammatory cytokines, which are associated with inflammatory responses mediated predominantly by dendritic cells (DCs), functioning as antigen-presenting cells. The present study aimed to investigate whether V. vulnificus infection induced the maturation and activation of murine DCs, which have the ability to polarize T helper (Th) cells into Th17 cells. Dysregulated Th17 cell responses are known to cause tissue damage, promoting the penetration of pathogens; however, Th17 cells are also involved in host defense against infection. Infection with V. vulnificus significantly increased the expression of cell surface molecules, including CD40, CD80 and major histocompatibility complex class II, leading to the maturation and activation of DCs. In the present study, the analysis of the cytokine profiles of DCs upon infection with V. vulnificus revealed the preferential production of interleukin-1β (IL-1β) and IL-6, through which V. vulnificus-infected DCs induced the polarization of Th17 cells when naïve CD4+ T cells were co-incubated. The reduction of Th17 cell generation through the use of anti-IL-6 neutralizing antibodies indicated that the Th17-polarizing capacity of V. vulnificus was predominantly dependent on DC-derived IL-6. The in vivo administration of V. vulnificus-infected DCs consistently increased the Th17 cell population in the lymph nodes of mice. Finally, the oral administration of V. vulnificus in mice also increased Th17 cell responses in the lamina propria of the small intestine. These results collectively demonstrated that V. vulnificus induced inflammatory Th17 cell responses via DCs, which may be associated with the immunopathological effects caused by V. vulnificus infection.

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