Ciproxifan, an H3 receptor antagonist, alleviates hyperactivity and cognitive deficits in the APP Tg2576 mouse model of Alzheimer's disease

Neurobiol Learn Mem. 2011 Jan;95(1):64-72. doi: 10.1016/j.nlm.2010.10.008. Epub 2010 Nov 10.


Previous research has indicated that the blockade of H(3)-type histamine receptors may improve attention and memory in normal rodents. The purpose of this study was to determine if ciproxifan, an H(3) receptor antagonist, could alleviate the hyperactivity and cognitive deficits observed in a transgenic mouse model (APP(Tg2576)) of Alzheimer's disease. APP(Tg2576) mice displayed significantly greater locomotor activity than wild-type mice, but APP(Tg2576) mice provided with daily ciproxifan treatment showed activity levels that did not differ from wild-type mice. In the swim maze, APP(Tg2576) mice exhibited significantly longer escape latencies, but the APP(Tg2576) mice treated daily with ciproxifan had latencies that were indistinguishable from controls. In probe trials conducted one hour after the last training trial, ciproxifan-treated APP(Tg2576) mice spent more time near the previous platform location and made more crossings of this area than did saline-treated APP(Tg2576) mice. APP(Tg2576) mice also demonstrated a significant impairment in the object recognition task that was reversed by acute treatment with ciproxifan (3.0mg/kg). These data support the idea that modulation of H(3) receptors represents a novel and viable therapeutic strategy in the treatment of Alzheimer's disease.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Amyloid beta-Protein Precursor / genetics
  • Analysis of Variance
  • Animals
  • Cognition / drug effects
  • Genotype
  • Histamine Antagonists / pharmacology
  • Histamine Antagonists / therapeutic use*
  • Hyperkinesis / drug therapy*
  • Hyperkinesis / genetics
  • Imidazoles / pharmacology
  • Imidazoles / therapeutic use*
  • Maze Learning / drug effects*
  • Memory Disorders / drug therapy*
  • Memory Disorders / genetics
  • Mice
  • Mice, Transgenic
  • Motor Activity / drug effects*
  • Motor Activity / genetics
  • Recognition, Psychology / drug effects


  • Amyloid beta-Protein Precursor
  • Histamine Antagonists
  • Imidazoles
  • ciproxifan