Reduced histamine levels and H3 receptor antagonist-induced histamine release in the amygdala of Apoe-/- mice

Peter Van Meer, Tim Pfankuch, Jacob Raber

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The histamine H3 receptor is a constitutively active G protein-coupled receptor for the neurotransmitter histamine that serves a negative feedback function. A role for the histamine H3 receptor has been suggested in neurodegenerative diseases, such as Parkinsons disease and Alzheimer's disease. Mice deficient in apolipoprotein E (apoE), a protein involved in development, regeneration, neurite outgrowth, and neuroprotection, show increased measures of anxiety and reduced sensitivity to effects of histamine H3 receptor antagonists on measures of anxiety. In this study, we tested whether in mice lacking apoE (Apoe-/-) histamine levels and histamine release in brain areas involved in the regulation of anxiety are altered. H3 receptor antagonist-induced histamine release was lower in the amygdala of Apoe-/- than wild-type mice. In contrast, there were no genotype differences in histamine release in the hypothalamus. Consistent with these data, histamine immunohistochemistry revealed lower total and synaptic histamine levels in the central nucleus of the amygdala of Apoe-/- than wild-type mice. Such changes were not seen in the hypothalamus, hippocampus, or cortex. In Apoe-/- mice, chronically decreased histamine levels and reduced histamine release in the amygdala might contribute to increased measures of anxiety.

Original languageEnglish (US)
Pages (from-to)124-130
Number of pages7
JournalJournal of Neurochemistry
Volume103
Issue number1
DOIs
StatePublished - Oct 1 2007

Keywords

  • Amygdala
  • Histamine
  • Histamine H receptor
  • Mice
  • apoE

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

Fingerprint Dive into the research topics of 'Reduced histamine levels and H<sub>3</sub> receptor antagonist-induced histamine release in the amygdala of Apoe-/- mice'. Together they form a unique fingerprint.

  • Cite this