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Phage lytic enzyme Cpl-1 for antibacterial therapy in experimental pneumococcal meningitis

Denis Grandgirard1, Jutta M Loeffler, Vincent A Fischetti

  • 1Institute for Infectious Diseases, University of Bern, Switzerland.

The Journal of Infectious Diseases
|May 13, 2008
PubMed

Insights

Emerging antibiotic resistance makes Streptococcus pneumoniae meningitis hard to treat. Recombinant Cpl-1, a phage lysin, showed significant antibacterial effects in cerebrospinal fluid in rat models, offering a potential new therapy.

Area of Science:

  • Microbiology
  • Pharmacology
  • Infectious Diseases

Background:

  • Antibiotic resistance in Streptococcus pneumoniae complicates bacterial meningitis treatment.
  • Phage lysins offer a novel therapeutic approach against resistant bacterial strains.

Purpose of the Study:

  • To evaluate the efficacy of recombinant Cpl-1 as an antimicrobial therapy for experimental pneumococcal meningitis.
  • To assess the pharmacokinetic and pharmacodynamic properties of Cpl-1 in cerebrospinal fluid.

Main Methods:

  • Experimental pneumococcal meningitis was induced in infant Wistar rats.
  • Recombinant Cpl-1 was administered via intracisternal and intraperitoneal routes.
  • Bacterial load in cerebrospinal fluid (CSF) was quantified over time.

Main Results:

  • A single intracisternal injection of Cpl-1 rapidly reduced pneumococci in CSF by 3 logs within 30 minutes, lasting 2 hours.
  • Intraperitoneal administration of Cpl-1 achieved a 2-log reduction in CSF bacterial load for 3 hours.
  • Cpl-1 demonstrated significant and rapid antimicrobial activity in the CSF.

Conclusions:

  • Recombinant Cpl-1 exhibits potent bactericidal activity against Streptococcus pneumoniae in a preclinical model of meningitis.
  • Cpl-1 presents a promising alternative therapeutic strategy for treating antibiotic-resistant pneumococcal meningitis.

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