Impairment of cliff avoidance reaction induced by subchronic methamphetamine administration and restraint stress: Comparison between two inbred strains of rats

Sumiko Yoshida, Yohtaro Numachi, Hiroo Matsuoka, Mitsumoto Sato

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

1. The effects of subchronic methamphetamine (MAP) treatment and restraint stress on the behavioral sensitization in stereotypy (stereotypy sensitization) and cliff avoidance reaction (CAR) were examined in two inbred strains of male rats; Fischer 344/N (F344), and Lewis/N (LEW). 2. In experiment 1, the animals received 4 mg/kg/day MAP for 30 days. LEW rats developed stereotypy sensitization earlier than F344 rats. However, both strains plateaued at the same stereotypy rating score. Furthermore, F344 rats were susceptible to CAR impairment as a result of MAP treatment, whereas LEW rats were not. 3. In experiment 2, the animals were exposed to daily restraint stress of 2hr for 4 weeks. MAP was administered (4mg/kg) 7 days after the last treatment day. Repeated restraint stress induced almost the same degree of stereotypy sensitization in both strains. F344 rats were susceptible to CAR impairment induced by repeated stress, whereas LEW rats were not. 4. The effects of psychostimulant and stressors appear to be similar not only with respect to stereotypy sensitization but also CAR impairment. Differences in MAP-or stress-induced CAR impairment between the two inbred strains may be genetically linked and may be involved in the development of psychotic behavior.

Original languageEnglish
Pages (from-to)1023-1032
Number of pages10
JournalProgress in Neuro-Psychopharmacology and Biological Psychiatry
Volume22
Issue number6
DOIs
Publication statusPublished - 1998 Aug

Keywords

  • Behavioral sensitization
  • Cliff avoidance reaction
  • Inbred strain
  • Methamphetamine
  • Restraint stress

ASJC Scopus subject areas

  • Pharmacology
  • Biological Psychiatry

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