Abundant Monovalent Ions as Environmental Signposts for Pathogens during Host Colonization
1Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, USA shumin.tan@tufts.edu.
Abstract:
Host colonization by a pathogen requires proper sensing and response to local environmental cues, to ensure adaptation and continued survival within the host. The ionic milieu represents a critical potential source of environmental cues, and indeed, there has been extensive study of the interplay between host and pathogen in the context of metals such as iron, zinc, and manganese, vital ions that are actively sequestered by the host. The inherent non-uniformity of the ionic milieu also extends, however, to "abundant" ions such as chloride and potassium, whose concentrations vary greatly between tissue and cellular locations, and with the immune response. Despite this, the concept of abundant ions as environmental cues and key players in host-pathogen interactions is only just emerging. Focusing on chloride and potassium, this review brings together studies across multiple bacterial and parasitic species that have begun to define both how these abundant ions are exploited as cues during host infection, and how they can be actively manipulated by pathogens during host colonization. The close links between ion homeostasis and sensing/response to different ionic signals, and the importance of studying pathogen response to cues in combination, are also discussed, while considering the fundamental insight still to be uncovered from further studies in this nascent area of inquiry.
Insights
Pathogens use abundant ions like chloride and potassium as environmental cues for host colonization. Understanding these host-pathogen interactions is crucial for developing new treatments.
Area of Science:
- Microbiology
- Pathogen-host interactions
- Environmental sensing
Background:
- Pathogen survival relies on sensing environmental cues within the host.
- While essential metals (iron, zinc, manganese) are well-studied, abundant ions like chloride and potassium are emerging as critical cues.
- Host environments exhibit significant ionic non-uniformity, influencing pathogen adaptation.
Purpose of the Study:
- To review the role of abundant ions, specifically chloride and potassium, in host-pathogen interactions.
- To explore how pathogens exploit these ions as environmental cues during infection.
- To discuss the manipulation of abundant ions by pathogens for colonization.
Main Methods:
- Literature review synthesizing studies across bacterial and parasitic species.
- Analysis of existing research on ion homeostasis and environmental sensing in pathogens.
- Discussion of combined cue responses and future research directions.
Main Results:
- Abundant ions, chloride and potassium, are increasingly recognized as vital environmental cues for pathogens.
- Pathogens actively exploit and manipulate these ions to adapt and survive within the host.
- Pathogen responses to combined ionic signals are important for understanding infection dynamics.
Conclusions:
- Chloride and potassium play significant roles in host-pathogen interactions and colonization.
- Further research into abundant ion sensing and manipulation by pathogens is warranted.
- Understanding these nascent interactions may reveal novel therapeutic targets.
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