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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
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Related Experiment Video

Updated: Dec 20, 2025

Live-cell Imaging of Fungal Cells to Investigate Modes of Entry and Subcellular Localization of Antifungal Plant Defensins
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Defensins: A Double-Edged Sword in Host Immunity.

Dan Xu1, Wuyuan Lu2

  • 1Institute of Mitochondrial Biology and Medicine, Key Laboratory of Biomedical Information Engineering of the Ministry of Education, School of Life Sciences and Technology, Xi'an Jiaotong University, Xi'an, China.

Frontiers in Immunology
|May 28, 2020
PubMed
Summary

Defensins, crucial for innate immunity, exhibit dual roles. While known for fighting infections, emerging research suggests they may also promote certain viral and bacterial infections and influence tumor immunity.

Keywords:
Shigellaantimicrobial peptidedefensinhost defense peptidehost–pathogen interactioninnate immunity

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Area of Science:

  • Immunology
  • Microbiology
  • Molecular Biology

Background:

  • Defensins are key host defense peptides primarily in neutrophils and epithelial cells.
  • They are recognized for broad antimicrobial and immunomodulatory roles in innate immunity.
  • Recent research indicates potential pathogenic roles in specific contexts.

Purpose of the Study:

  • To review the dual nature of defensins in host immunity.
  • To summarize recent findings on their potential pathogenic properties.
  • To explore their complex roles in antitumor immunity.

Main Methods:

  • Literature review of recent studies on defensin functions.
  • Analysis of defensin roles in antimicrobial, antiviral, and antitumor immunity.
  • Synthesis of findings on both protective and potentially pathogenic activities.

Main Results:

  • Defensins possess established protective roles against bacterial, viral, and fungal infections.
  • Evidence suggests defensins may promote infections in certain biological settings.
  • Defensins display complex, context-dependent tumor-proliferative and -suppressive activities.

Conclusions:

  • Defensins act as a 'double-edged sword' in host immunity.
  • Their function is highly dependent on the biological environment.
  • Further research is needed to fully elucidate their multifaceted roles.