Changes in head-dipping behavior in the hole-board test reflect the anxiogenic and/or anxiolytic state in mice

Eur J Pharmacol. 1998 May 29;350(1):21-9. doi: 10.1016/s0014-2999(98)00223-4.

Abstract

The effects of treatment with anxiogenic or anxiolytic agents and exposure to acute restraint stress on emotional behavior in mice were examined using an automatic hole-board apparatus. Changes in the emotional state of mice were evaluated in terms of changes in exploratory activity, i.e., total locomotor activity, numbers and duration of rearing and head-dipping, and latency to the first head-dipping. The typical benzodiazepine anxiolytics diazepam (0.05-0.5 mg/kg, i.p.) and chlordiazepoxide (0.5-4 mg/kg, i.p.) dose-dependently increased the number and duration of head-dips at doses that did not produce sedation. In contrast with these anxiolytics, the typical anxiogenic drugs N-methyl-beta-carboline-3-carboxamide (FG7142, 0.125-10 mg/kg, i.p.) and methyl-beta-carboline-3-carboxylate (beta-CCM, 0.1-2 mg/kg, i.p.) decreased both the number and duration of head-dips, and increased the latency to head-dipping. Moreover, decreases in the number and duration of head-dips, and an increase in the latency to head-dipping, were also observed in animals that were exposed to acute restraint stress. These effects of acute restraint stress were suppressed by treatment with diazepam at a dose that alone did not produce significant behavioral effects (0.1 mg/kg, i.p.). In addition, non-benzodiazepine anxiolytic flesinoxan (0.1 mg/kg, i.p.), a 5-HT1A receptor agonist, also had an effect on the restraint stress-induced decrease in head-dipping behavior. The present study shows that the changes in several exploratory behaviors could be objectively measured using our automatic hole-board apparatus. Therefore, this system can serve as a useful tool for evaluating the changes in various emotional states of animals. Moreover, we also found that treatment with anxiolytics or anxiogenics and exposure to acute restraint stress affected head-dipping behavior. These results suggest that changes in head-dipping behavior in the hole-board test may reflect the anxiogenic and/or anxiolytic state of animals.

MeSH terms

  • Animals
  • Anti-Anxiety Agents / pharmacology*
  • Anxiety / physiopathology*
  • Carbolines / pharmacology
  • Chlordiazepoxide / pharmacology
  • Convulsants / pharmacology
  • Diazepam / pharmacology*
  • Exploratory Behavior / drug effects
  • GABA Antagonists / pharmacology
  • Head Movements
  • Male
  • Mice
  • Mice, Inbred ICR
  • Piperazines / pharmacology
  • Restraint, Physical
  • Stress, Physiological / physiopathology*

Substances

  • Anti-Anxiety Agents
  • Carbolines
  • Convulsants
  • GABA Antagonists
  • Piperazines
  • flesinoxan
  • FG 7142
  • Chlordiazepoxide
  • beta-carboline-3-carboxylic acid methyl ester
  • Diazepam