Human Enteric α-Defensin 5 Promotes Shigella Infection by Enhancing Bacterial Adhesion and Invasion

Immunity. 2018 Jun 19;48(6):1233-1244.e6. doi: 10.1016/j.immuni.2018.04.014.

Dan Xu ¹, Chongbing Liao ², Bing Zhang ³, W David Tolbert ⁴, Wangxiao He ¹, Zhijun Dai ⁵, Wei Zhang ³, Weirong Yuan ⁴, Marzena Pazgier ⁴, Jiankang Liu ³, Jun Yu ⁶, Philippe J Sansonetti ⁷, Charles L Bevins ⁸, Yongping Shao ⁹, Wuyuan Lu ¹⁰

Affiliations

1 Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China; Center for Translational Medicine, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China; Institute of Human Virology and Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.
2 Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China; Center for Translational Medicine, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China.
3 Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China.
4 Institute of Human Virology and Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.
5 Second Affiliated Hospital, Xi'an Jiaotong University School of Medicine, Xi'an, China.
6 Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK.
7 Institut Pasteur, Unité de Pathogénie Microbienne Moléculaire, 75724 Paris, France.
8 Department of Microbiology and Immunology, School of Medicine, University of California, Davis, Davis, CA, USA.
9 Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China; Center for Translational Medicine, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China. Electronic address: [email protected].
10 Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China; Center for Translational Medicine, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China; Institute of Human Virology and Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA. Electronic address: [email protected].

PMID: 29858013 DOI: 10.1016/j.immuni.2018.04.014

Abstract

Shigella is a Gram-negative bacterium that causes bacillary dysentery worldwide. It invades the intestinal epithelium to elicit intense inflammation and tissue damage, yet the underlying mechanisms of its host selectivity and low infectious inoculum remain perplexing. Here, we report that Shigella co-opts human α-defensin 5 (HD5), a host defense peptide important for intestinal homeostasis and innate immunity, to enhance its adhesion to and invasion of mucosal tissues. HD5 promoted Shigella Infection in vitro in a structure-dependent manner. Shigella, commonly devoid of an effective host-adhesion apparatus, preferentially targeted HD5 to augment its ability to colonize the intestinal epithelium through interactions with multiple Bacterial membrane proteins. HD5 exacerbated infectivity and Shigella-induced pathology in a culture of human colorectal tissues and three animal models. Our findings illuminate how Shigella exploits innate immunity by turning HD5 into a virulence factor for Infection, unveiling a mechanism of action for this highly proficient human pathogen.

Keywords

Shigella; antimicrobial peptide; bacterial adhesion; defensin; enteropathogenic bacteria; epithelial integrity; host-microbe interaction; innate immunity.

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