Effects of Two Types of Restraint Stress on the Learned Behaviour in Rats
| Autor: | Koupilová M, Sixtus Hynie, P. Sida, Věra Klenerová |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Male
endocrine system medicine.medical_specialty 050402 sociology Stress exposure lcsh:Medicine Lewis and Wistar rats Avoidance response Immobilization 03 medical and health sciences 0302 clinical medicine 0504 sociology Stress Physiological Restraint and restraint/cold stressors Internal medicine Avoidance Learning Lewis rats Animals Medicine Rats Wistar Maze Learning Memory test Y-maze Training period 030203 arthritis & rheumatology business.industry HPA axis lcsh:R 05 social sciences Stressor General Medicine Rats Endocrinology Rats Inbred Lew Home cage Restraint stress business |
| Zdroj: | Acta Medica, Vol 46, Iss 4, Pp 153-156 (2003) Scopus-Elsevier |
| ISSN: | 1805-9694 1211-4286 |
| DOI: | 10.14712/18059694.2019.25 |
| Popis: | To study the effects of stress on cognitive functions, Wistar and Lewis rats were exposed to restraint (immobilization stressor) (IMO) or restraint combined with partial immersion into water (IMO+C). Learned discriminatory avoidance response in Y-maze, with foot-shock as an unconditioned stimulus, was used as a memory test. The latency to enter the correct arm and number of wrong entries were daily recorded during the training period (20 days) until the criterion was reached, which was set at 90 % avoidances (choosing the correct arm). After exposure of rats to one of the stressors for 60 min, the rats were returned to the home cage; the latency to enter the safe arm was recorded in 6 daily trials that started 1 h after application of stressor. Both stressors significantly prolonged the avoidance latencies for 2 or 3 days in Wistar and Lewis rats, respectively; then the latencies returned to the values obtained before the stress exposure. In Lewis rats, the latencies more increased after IMO+C than after IMO stressor, and the maximal increase in latencies was higher in Lewis rats than in Wistar rats. The latency did not reach the time limit for foot-shock delivery, and the number of correct choices remained unchanged in both strains. The results indicate that the used restraint stressors did not affect the long-term memory; rather a transient impairment of retrieval can be considered. Further, differences in response of Lewis and Wistar rats may be interpreted by different activity of hypothalamic-pituitary-adrenal axis activity in used strains. |
| Databáze: | OpenAIRE |
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