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Oligosaccharides interfere with the establishment and progression of experimental pneumococcal pneumonia

I Idänpään-Heikkilä1, P M Simon, D Zopf

  • 1Rockefeller University, and Department of Radiology, New York Hospital-Cornell Medical Center, New York, USA.

The Journal of Infectious Diseases
|September 18, 1997
PubMed

Insights

Lacto-N-neotetraose (LNnT) oligosaccharides prevent pneumococcal adherence and reduce infection severity. These compounds show promise as preventive and therapeutic agents for bacterial infectious diseases.

Area of Science:

  • Microbiology
  • Immunology
  • Pharmacology

Background:

  • Bacterial adherence to epithelial cells is a key step in infection.
  • Oligosaccharides can block bacterial adherence.
  • Streptococcus pneumoniae causes pneumonia and nasopharyngeal colonization.

Purpose of the Study:

  • To evaluate the efficacy of lacto-N-neotetraose (LNnT) and its derivatives in preventing and treating pneumococcal infections.
  • To assess the potential of these oligosaccharides as therapeutic and preventive agents.

Main Methods:

  • In vitro testing of oligosaccharide anti-adherence properties.
  • Animal models (rabbits and infant rats) for pneumococcal pneumonia and nasopharyngeal colonization.
  • Intratracheal and intranasal administration of oligosaccharides and bacteria.

Main Results:

  • Oligosaccharides significantly reduced pneumococcal load in rabbit lungs and prevented bacteremia.
  • Therapeutic administration of oligosaccharides ameliorated pneumonia and bacteremia.
  • Intranasal administration prevented nasopharyngeal colonization in infant rats.
  • LNnT induced changes in lung epithelial cells, inhibiting pneumococcal adherence.

Conclusions:

  • LNnT and its derivatives demonstrate potent anti-adherence activity against Streptococcus pneumoniae.
  • These oligosaccharides are effective in both preventing and treating pneumococcal infections in animal models.
  • Oligosaccharides represent a promising class of agents for the development of novel preventive and therapeutic strategies against infectious diseases.

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