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Zinc is an important inter-kingdom signal between the host and microbe

Xia, Pengpeng, Lian, Siqi, Wu, Yunping, Yan, Li, Quan, Guomei, Zhu, Guoqiang·2021·Veterinary Research

Abstract

Zinc (Zn) is an essential trace element in living organisms and plays a vital role in the regulation of both microbial virulence and host immune responses. A growing number of studies have shown that zinc deficiency or the internal Zn concentration does not meet the needs of animals and microbes, leading to an imbalance in zinc homeostasis and intracellular signalling pathway dysregulation. Competition for zinc ions (Zn 2+) between microbes and the host exists in the use of Zn 2+ to maintain cell structure and physiological functions. It also affects the interplay between microbial virulence factors and their specific receptors in the host. This review will focus on the role of Zn in the crosstalk between the host and microbe, especially for changes in microbial pathogenesis and nociceptive neuron-immune interactions, as it may lead to new ways to prevent or treat microbial infections.

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Figure 1 Zinc transporter systems in bacteria [2, 9, 19–22]. Under zinc-replete conditions, membrane transport based on the P-type ATPase, CDF-type and RND-type families participates in zinc distribution. They work together to maintain zinc homeostasis in the cell. With sufficient zinc supplementation, bacteria control the cellular zinc concentration by a low-affinity absorption system, such as Pit and ZupT. Under zinc-limiting conditions, transporters of the high-affinity absorption system are induced and used to recruit Zn2+ against zinc deficiency, including ZnuACB, ZitB, ZnuD, etc.
Figure 1 Zinc transporter systems in bacteria [2, 9, 19–22]. Under zinc-replete conditions, membrane transport based on the P-type ATPase, CDF-type and RND-type families participates in zinc distribution. They work together to maintain zinc homeostasis in the cell. With sufficient zinc supplementation, bacteria control the cellular zinc concentration by a low-affinity absorption system, such as Pit and ZupT. Under zinc-limiting conditions, transporters of the high-affinity absorption system are induced and used to recruit Zn2+ against zinc deficiency, including ZnuACB, ZitB, ZnuD, etc.CC BY · PubMed Central
Figure 2 Regulation of mucosal immune homeostasis in the intestine [7, 71, 78, 108, 123, 133]. The dynamic change in competition in zinc acquisition between the host and pathogens is complicated. In addition to playing a role in enzymes and structural cofactors for the survival of all organisms, zinc also affects the activity of some transmembrane receptor proteins, including TLRs, which are responsible for the recognition of microbes or antigen molecules and the development and modulation of immune responses. Upon pathogen attack, some zinc-sequestering proteins are expressed and recruited to the infected site to chelate zinc ions and limit the growth and virulence of pathogenic bacteria, such as calprotectin, also known as the S100A8/S100A9 heterodimer, which is vital for strategic nutritional immunity. During the infectious process, the host also releases other S100 proteins, and then the binding of S100 proteins to cell surface receptors, such as TLR4, RAGE, and GPCRs, plays an important role in the regulation of inflammatory signal transduction. In turn, by regulating downstream signalling pathways, zinc can enhance the integrity of the intestinal mucosal barrier and reduce inflammation and diarrhoea caused by pathogenic infection.
Figure 2 Regulation of mucosal immune homeostasis in the intestine [7, 71, 78, 108, 123, 133]. The dynamic change in competition in zinc acquisition between the host and pathogens is complicated. In addition to playing a role in enzymes and structural cofactors for the survival of all organisms, zinc also affects the activity of some transmembrane receptor proteins, including TLRs, which are responsible for the recognition of microbes or antigen molecules and the development and modulation of immune responses. Upon pathogen attack, some zinc-sequestering proteins are expressed and recruited to the infected site to chelate zinc ions and limit the growth and virulence of pathogenic bacteria, such as calprotectin, also known as the S100A8/S100A9 heterodimer, which is vital for strategic nutritional immunity. During the infectious process, the host also releases other S100 proteins, and then the binding of S100 proteins to cell surface receptors, such as TLR4, RAGE, and GPCRs, plays an important role in the regulation of inflammatory signal transduction. In turn, by regulating downstream signalling pathways, zinc can enhance the integrity of the intestinal mucosal barrier and reduce inflammation and diarrhoea caused by pathogenic infection.CC BY · PubMed Central

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Metadata

Authors
Xia, P., Lian, S., Wu, Y., Yan, L., Quan, G., & Zhu, G.
Venue
Veterinary Research
Published
2021-03-04
Volume
52
Issue
1
ISSN
1297-9716
Cited by
69
References
10
Language
en
Funders
  • Chinese National Science Foundation Grant (32072820, 31702242)
  • Jiangsu Government Scholarship for Overseas Studies (JS20190246)

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