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Vitamin B6 reduces hippocampal apoptosis in experimental pneumococcal meningitis

Denise C Zysset-Burri1, Caroline L Bellac, Stephen L Leib

  • 1Biology Division, Spiez Laboratory, Federal Office for Civil Protection, Austrasse, CH-3700, Spiez, Switzerland. stephen.leib@babs.admin.ch.

BMC Infectious Diseases
|August 28, 2013
PubMed
Abstract

Insights

Vitamin B6 significantly reduced hippocampal apoptosis in a rat model of bacterial meningitis. This neuroprotective effect involves reducing inflammation and preserving cellular energy, highlighting vitamin B6 as a potential therapeutic target.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Bacterial meningitis, particularly from Streptococcus pneumoniae, causes high mortality and severe neurological sequelae.
  • The inflammatory response in meningitis induces the kynurenine pathway, leading to hippocampal apoptosis and cognitive deficits.
  • Vitamin B6, a cofactor in the kynurenine pathway, may mitigate neurotoxicity and preserve cellular energy.

Purpose of the Study:

  • To investigate the neuroprotective effects of vitamin B6 on hippocampal apoptosis in a pneumococcal meningitis model.
  • To analyze the impact of vitamin B6 on gene expression and cellular energy status in the hippocampus.

Main Methods:

  • Wistar rats were infected with Streptococcus pneumoniae and treated with vitamin B6 or saline.
  • Histomorphology, transcriptomics, and cellular nicotinamide adenine dinucleotide content were assessed.
  • Functional annotation clustering was used to analyze gene expression data.

Main Results:

  • Vitamin B6 treatment significantly reduced hippocampal apoptosis (p > 0.02).
  • Gene expression analysis revealed down-regulation of inflammatory response genes and up-regulation of genes related to circadian rhythm, neuronal signaling, and apoptotic cell death.
  • Vitamin B6 helped prevent the exhaustion of cellular energy stores.

Conclusions:

  • Vitamin B6 attenuates apoptosis through multiple mechanisms, including reduced inflammation and enhanced neuroprotective factors like brain-derived neurotrophic factor.
  • The study identifies vitamin B6 as a promising therapeutic agent for reducing brain injury in bacterial meningitis.
  • Vitamin B6's role in preserving cellular energy contributes to its neuroprotective effects.

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