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Bacterial pore-forming cytolysins induce neuronal damage in a rat model of neonatal meningitis

Anja Reiss1, Johann S Braun, Katja Jäger

  • 1Department of Neonatology, Charité Universitätsmedizin Berlin, Berlin, Germany.

The Journal of Infectious Diseases
|December 28, 2010
PubMed

Insights

Bacterial toxins like Group B Streptococcus β-hemolysin/cytolysin and Streptococcus pneumoniae pneumolysin cause neuronal damage in neonatal meningitis, worsening outcomes. These pore-forming toxins play a key role in meningitis pathogenesis.

Area of Science:

  • Microbiology
  • Neuroscience
  • Infectious Diseases

Background:

  • Group B Streptococcus (GBS) and Streptococcus pneumoniae (SP) are primary causes of bacterial meningitis in infants.
  • Both GBS and SP produce pore-forming cytolytic toxins: β-hemolysin/cytolysin (β-h/c) and pneumolysin, respectively.

Purpose of the Study:

  • To investigate the neurotoxic role of GBS β-h/c and SP pneumolysin in experimental neonatal meningitis.
  • To understand the contribution of these bacterial toxins to meningitis pathogenesis.

Main Methods:

  • Neonatal meningitis was induced in rats via intracisternal injection of wild-type GBS or SP.
  • Mutant strains deficient in β-h/c, pneumolysin, or both were used for comparison.
  • In vitro experiments assessed β-h/c-induced neuronal apoptosis.

Main Results:

  • GBS β-h/c and SP pneumolysin significantly contributed to neuronal damage and worsened clinical outcomes, including weight loss.
  • These toxins did not affect early leukocyte influx or bacterial growth in cerebrospinal fluid.
  • In vitro, β-h/c induced neuronal apoptosis independent of caspase activation.

Conclusions:

  • Bacterial pore-forming cytolysins, specifically GBS β-h/c and SP pneumolysin, are key contributors to neuronal damage in neonatal meningitis.
  • These findings highlight the critical role of bacterial toxins in the pathogenesis and long-term consequences of neonatal meningitis.
Abstract

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