Probiotic Fermented Milk Boosts Defensin Production to Protect Against Typhoid in Mice
Lacticaseibacillus rhamnosus D1 fermented milk protected mice from typhoid fever by upregulating antimicrobial peptide (defensin) production in the gut.
Quick Facts
What This Study Found
L. rhamnosus D1 fermented milk upregulated gut defensin production, protecting mice from Salmonella typhi infection through enhanced innate antimicrobial peptide defense.
Key Numbers
BALB/c mice were used. Multiple outcomes measured: survival rates, weight changes, bacterial translocation levels, antimicrobial peptide and cytokine mRNA expression, and microbiota composition.
How They Did This
Mouse typhoid model treated with L. rhamnosus D1 fermented milk. Assessed defensin expression, bacterial burden, gut barrier function, and immune markers.
Why This Research Matters
Boosting the body's own antimicrobial peptides through simple dietary interventions like fermented milk could provide low-cost, accessible infection prevention, especially in developing countries where typhoid is endemic.
The Bigger Picture
This connects probiotics to antimicrobial peptide biology. Rather than providing direct antimicrobial effects, probiotics may protect against infections by training the host's innate defense system to produce more defensins — a natural, self-sustaining antimicrobial strategy.
What This Study Doesn't Tell Us
Mouse study. Human gut defensin responses to probiotics may differ. Typhoid pathogenesis differs between mice and humans. Specific probiotic strain may not be commercially available.
Questions This Raises
- ?Would L. rhamnosus D1 fermented milk reduce typhoid risk in endemic areas?
- ?Can other probiotic strains also upregulate defensin production?
- ?Could defensin-boosting probiotics protect against antibiotic-resistant infections?
Trust & Context
- Key Stat:
- Probiotics boost defensins Fermented milk with L. rhamnosus D1 increased the gut's own antimicrobial peptide production to fight typhoid
- Evidence Grade:
- Preliminary evidence: mouse infection model showing probiotic-mediated defensin upregulation. No human typhoid prevention data.
- Study Age:
- Published in 2025. Links probiotic science to antimicrobial peptide innate defense.
- Original Title:
- Lacticaseibacillus rhamnosus D1 Fermented Milk Confers Protection Against Typhoid Fever Through Immunomodulation and Gut Microbiota Regulation in Mice.
- Published In:
- Microorganisms, 13(10) (2025)
- Authors:
- Acurcio, Leonardo, Sandes, Sávio, Rios, Diego, Sant'Anna, Felipe, Pedroso, Silvia, Bastos, Rafael, Souza, Marcelo, Nicoli, Jacques
- Database ID:
- RPEP-09765
Evidence Hierarchy
Frequently Asked Questions
Can yogurt protect against infections?
This study shows fermented milk with specific probiotics can boost your gut's natural antimicrobial peptides (defensins), which help fight bacterial infections. While not a replacement for vaccines or antibiotics, probiotic fermented foods may enhance your innate immune defense.
What are defensins?
Defensins are natural antimicrobial peptides produced by cells lining your gut, skin, and airways. They kill bacteria by punching holes in their membranes. Probiotics can stimulate your body to produce more of these protective peptides.
Read More on RethinkPeptides
Cite This Study
https://rethinkpeptides.com/research/RPEP-09765APA
Acurcio, Leonardo; Sandes, Sávio; Rios, Diego; Sant'Anna, Felipe; Pedroso, Silvia; Bastos, Rafael; Souza, Marcelo; Nicoli, Jacques. (2025). Lacticaseibacillus rhamnosus D1 Fermented Milk Confers Protection Against Typhoid Fever Through Immunomodulation and Gut Microbiota Regulation in Mice.. Microorganisms, 13(10). https://doi.org/10.3390/microorganisms13102348
MLA
Acurcio, Leonardo, et al. "Lacticaseibacillus rhamnosus D1 Fermented Milk Confers Protection Against Typhoid Fever Through Immunomodulation and Gut Microbiota Regulation in Mice.." Microorganisms, 2025. https://doi.org/10.3390/microorganisms13102348
RethinkPeptides
RethinkPeptides Research Database. "Lacticaseibacillus rhamnosus D1 Fermented Milk Confers Prote..." RPEP-09765. Retrieved from https://rethinkpeptides.com/research/acurcio-2025-lacticaseibacillus-rhamnosus-d1-fermented
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkPeptides research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.