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Updated: May 5, 2026

Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
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Vancomycin-resistant enterococci exploit antibiotic-induced innate immune deficits

Katharina Brandl1, George Plitas, Coralia N Mihu

  • 1Infectious Diseases Service, Department of Medicine, Immunology Program, Sloan-Kettering Institute, New York, New York, USA.

Nature
|August 30, 2008
PubMed

Insights

Broad-spectrum antibiotics reduce RegIIIgamma, a key immune protein, allowing dangerous VRE infections. Restoring RegIIIgamma via Toll-like receptor stimulation offers a way to combat antibiotic-resistant bacteria.

Area of Science:

  • Microbiology
  • Immunology
  • Gastroenterology

Background:

  • Antibiotic-resistant bacterial infections, like vancomycin-resistant Enterococcus (VRE), are significant healthcare challenges.
  • The mechanisms by which antibiotic use promotes these infections are not fully understood.

Purpose of the Study:

  • To investigate the impact of antibiotic treatment on intestinal immune defenses against antibiotic-resistant bacteria.
  • To identify molecular mechanisms linking antibiotic therapy to increased susceptibility to VRE.

Main Methods:

  • Antibiotic treatment of mice to assess changes in intestinal gene expression.
  • Quantification of vancomycin-resistant Enterococcus (VRE) colonization in the gut.
  • Stimulation of Toll-like receptor 4 (TLR4) with lipopolysaccharide (LPS) to evaluate immune response.

Main Results:

  • Antibiotic therapy significantly downregulated intestinal RegIIIgamma (Reg3g) expression in mice.
  • Reduced RegIIIgamma levels correlated with increased VRE colonization.
  • Oral lipopolysaccharide (LPS) administration restored RegIIIgamma expression and enhanced resistance to VRE.

Conclusions:

  • Antibiotic-induced suppression of RegIIIgamma compromises innate mucosal immunity against Gram-positive pathogens like VRE.
  • Targeting Toll-like receptors presents a potential strategy to restore mucosal defense and combat antibiotic-resistant infections.

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