Appearance of interleukin-1 in macrophages and in ramified microglia in the brain of endotoxin-treated rats: a pathway for the induction of non-specific symptoms of sickness?

A M van Dam, M Brouns, S Louisse, F Berkenbosch

Research output: Contribution to JournalArticle


The presence and cellular localization of interleukin-1 beta immunoreactivity (irIL-1) in and around the brain was investigated using immunocytochemistry on Bouin's fixed vibratome brain sections of control and endotoxin-treated rats. Peripheral administration of endotoxin resulted in the appearance of irIL-1 in cells in the meninges, choroid plexus, brain blood vessels and in non-neuronal cells in the brain parenchyma. Using monoclonal and polyclonal antibodies to macrophage and astrocyte antigens, the endotoxin-induced irIL-1 positive cells could be identified as macrophages in the meninges and choroid plexus (ED2), perivascular cells (ED2) and ramified microglial cells (GSA-I-B4 isolectin). Our data demonstrate a pathway for the induction of non-specific sickness symptoms in response to endotoxin.

Original languageEnglish
Pages (from-to)291-6
Number of pages6
JournalBrain Research
Issue number2
Publication statusPublished - 21 Aug 1992



  • Animals
  • Brain/cytology
  • Endotoxins/pharmacology
  • Immunohistochemistry
  • Interleukin-1/metabolism
  • Macrophages/metabolism
  • Male
  • Neuroglia/drug effects
  • Rats
  • Rats, Wistar

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