Behavioural characterization and amounts of brain monoamines and their metabolites in mice lacking histamine h1 receptors

K. Yanai, L. Z. Son, M. Endou, E. Sakurai, O. Nakagawasai, T. Tadano, K. Kisara, I. Inoue, T. Watanabe, T. Watanabe

Research output: Contribution to journalArticlepeer-review

138 Citations (Scopus)


Behavioural assessments were made of mutant mice lacking histamine H1 receptors to reveal the function of HI receptors in the behaviour of mice. Exploratory behaviour of mice in a new environment was examined to discover whether the absence of H1 receptors in mice affects actions relating to their emotions. The H1 receptor-deficient mice showed a significant decrease in ambulation in an open field and on an activity wheel. Cognitive functions and anxiety were examined using passive avoidance response test and the elevated plus-maze test, respectively. The passive avoidance test did not show any change in latency. The elevated plus-maze test revealed that the transfer latency of the mutant mice was significantly prolonged, indicating that HI receptors are partly associated with the control of anxiety. Aggressive behaviour was examined by a resident-intruder aggression test. When confronted with an intruder, the mutant mice attacked the intruder significantly slower and less frequently than did wild-type mice after a six- month isolation period. A formalin test and a forced swimming test were used to evaluate the nociceptive response and depressive or despairing state, respectively, of both groups. The mutant mice showed a significant decrease of nociceptive response in the late phase without affecting the early phase. There was no significant difference in the forced swimming test between the two groups. The brain content of monoamines and their metabolites was measured in the H1 receptor null and wild-type mice. The turnover rate of 5- hydroxytryptamine defined by the ratio of 5-hydroxyindoleacetic acid and 5- hydroxytryptamine was significantly increased in the cerebral cortex and hippocampus of H1 receptor null mice. These results support the previous pharmacological findings that histamine modulates various neurophysiological functions such as locomotor activity, emotion, memory and learning, nociception and aggressive behaviour through H1 receptors.

Original languageEnglish
Pages (from-to)479-487
Number of pages9
Issue number2
Publication statusPublished - 1998 Jul 20


  • 5-hydroxytryptamine
  • Behaviour
  • Circadian rhythm
  • Gene targeting
  • Histamine H1 receptors
  • Isolation-induced aggression

ASJC Scopus subject areas

  • Neuroscience(all)


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