Defensins are antimicrobial peptides with roles far beyond killing pathogens — they regulate immunity, gut health, and barrier function, and show therapeutic promise across diseases from infections to cancer.
Multi-disease relevanceDefensins are implicated in infectious disease, IBD, diabetes, obesity, lung disease, periodontitis, and cancer — far beyond their traditional antimicrobial role
What the researchers found
This comprehensive review synthesizes the current understanding of defensins — a family of cationic antimicrobial peptides produced primarily by Paneth cells, neutrophils, and epithelial cells. The review covers their structural features, evolutionary history, and antimicrobial mechanisms, as well as their broader biological roles in immune homeostasis, chemotaxis, mucosal barrier maintenance, gut microbiota regulation, intestinal development, and regulation of cell death.
The authors detail the clinical relevance of defensins across multiple disease areas including infectious diseases, inflammatory bowel disease, diabetes and obesity, chronic inflammatory lung disease, periodontitis, and cancer. They also examine how nutrients — fatty acids, amino acids, microelements, plant extracts, and probiotics — regulate defensin expression, offering potential dietary strategies for modulating host defense.
Why it matters
Defensins sit at the intersection of innate immunity, gut health, and multiple chronic diseases. This review consolidates decades of research into a single resource, highlighting both the therapeutic promise and the challenges of developing defensin-based therapies. Understanding how diet and nutrients regulate defensin production could lead to practical interventions for improving immune defense.
How the study worked
Comprehensive narrative review of published literature on defensins, covering their structure, mechanisms of action, biological functions, clinical relevance across multiple diseases, and nutrient-dependent regulation.
Who was studied
Review article (no study population)
What this study cannot tell us
As a narrative review, this paper synthesizes existing literature rather than presenting new experimental data. The therapeutic potential discussed is largely theoretical, as defensin-based therapies face significant development challenges including stability, delivery, and potential toxicity that are acknowledged but not resolved.
How to read the evidence
This is a comprehensive review published in a high-impact journal (Signal Transduction and Targeted Therapy), synthesizing consensus knowledge from a large body of literature. It represents established scientific understanding of defensin biology.
When this study was published
Published in 2023, this review captures the current state of defensin research and remains highly relevant as antimicrobial peptide therapeutics continue to be actively developed.
The bigger picture
Antimicrobial peptides like defensins are gaining attention as the antibiotic resistance crisis grows. This review positions defensins not just as natural antibiotics but as multifunctional immune regulators, making them candidates for next-generation therapeutics. The nutrient-regulation angle also connects to the growing field of immunonutrition.
Questions still open
- Can defensin-based therapies overcome the stability and delivery challenges to become viable clinical treatments?
- Which dietary interventions most effectively boost defensin production in humans, and could they serve as adjuncts to conventional antimicrobial therapy?
- How do individual genetic variations in defensin genes influence susceptibility to the diseases discussed in this review?
Common questions
What are defensins and where does the body make them?
Can you boost your defensin levels through diet?
Read the original research
Mechanisms and regulation of defensins in host defense.
Signal transduction and targeted therapy, 8(1), 300
Citation
Fu, Jie; Zong, Xin; Jin, Mingliang; Min, Junxia; Wang, Fudi; Wang, Yizhen. (2023). Mechanisms and regulation of defensins in host defense.. Signal transduction and targeted therapy, 8(1), 300. https://doi.org/10.1038/s41392-023-01553-x