Lipopolysaccharide potentiates hyperthermia-induced seizures

Baik Lin Eun, Jayne Abraham, Lauren Mlsna, Min Jung Kim, Sookyong Koh

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Background: Prolonged febrile seizures (FS) have both acute and long-lasting effects on the developing brain. Because FS are often associated with peripheral infection, we aimed to develop a preclinical model of FS that simulates fever and immune activation in order to facilitate the implementation of targeted therapy after prolonged FS in young children. Methods: The innate immune activator lipopolysaccharide (LPS) was administered to postnatal day 14 rat (200μg/kg) and mouse (100μg/kg) pups 2-2.5h prior to hyperthermic seizures (HT) induced by hair dryer or heat lamp. To determine whether simulation of infection enhances neuronal excitability, latency to seizure onset, threshold temperature and total number of seizures were quantified. Behavioral seizures were correlated with electroencephalographic changes in rat pups. Seizure-induced proinflammatory cytokine production was assessed in blood samples at various time points after HT. Seizure-induced microglia activation in the hippocampus was quantified using Cx3cr1GFP/+ mice. Results: Lipopolysaccharide priming increased susceptibility of rats and mice to hyperthemic seizures and enhanced seizure-induced proinflammatory cytokine production and microglial activation. Conclusions: Peripheral inflammation appears to work synergistically with hyperthermia to potentiate seizures and to exacerbate seizure-induced immune responses. By simulating fever, a regulated increase in body temperature from an immune challenge, we developed a more clinically relevant animal model of prolonged FS.

Original languageEnglish
Article numbere00348
JournalBrain and Behavior
Volume5
Issue number8
DOIs
Publication statusPublished - 2015 Aug 1

Keywords

  • Brain inflammation
  • Cytokines
  • Febrile seizures
  • Lipopolysaccharide
  • Microglia
  • Temporal lobe epilepsy

ASJC Scopus subject areas

  • Behavioral Neuroscience

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  • Cite this

    Eun, B. L., Abraham, J., Mlsna, L., Kim, M. J., & Koh, S. (2015). Lipopolysaccharide potentiates hyperthermia-induced seizures. Brain and Behavior, 5(8), [e00348]. https://doi.org/10.1002/brb3.348