COMPARISON OF ANXIETY MEASURED IN THE ELEVATED PLUS-MAZE, OPEN-FIELD AND SOCIAL-INTERACTION TESTS BETWEEN SPONTANEOUSLY HYPERTENSIVE RATS AND WISTAR EPM-1 RATS

COMPARISON OF ANXIETY MEASURED IN THE ELEVATED PLUS-MAZE, OPEN-FIELD AND SOCIAL-INTERACTION TESTS BETWEEN SPONTANEOUSLY HYPERTENSIVE RATS AND WISTAR EPM-1 RATS

Author Goto, S. H. Google Scholar
Conceição, Isaltino Marcelo da Autor UNIFESP Google Scholar
Ribeiro, R. A. Google Scholar
Frussa-Filho, Roberto Autor UNIFESP Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Abstract On the basis of open-field and plus-maze results it has been proposed that spontaneously hypertensive (SHR) rats are less emotionally reactive than their normotensive controls, Wistar-Kyoto (WKY). However, the proposed ''anxiolytic characteristics'' of SHR rats may be questioned in view of the significant hypoactivity presented by WKY rats. In the present study, the behavioral response of spontaneously hypertensive (SHR) and equally active normotensive Wistar EPM-1 (EPM-1) rats (4-month old males, 10-13 animals per group) were evaluated in the open-field, social interaction and elevated plus-maze tests. In the open-field study, no differences were observed for total locomotion frequency and immobility duration, but SHR rats presented a higher central square locomotion frequency (23.8 +/- 2.1 vs 10.3 +/- 1.6) as compared to EPM-1. SHR rats also exhibited a greater duration of social interaction when compared to EPM-1 rats (mean +/- SEM values were 113.9 +/- 8.7 s for SHR vs 72.7 +/- 8.6 s for EPM-1 rats after 8-min observation). In the elevated plus-maze test, SHR rats presented an increased percent of entries (52.8 +/- 3.3 vs 28.3 +/- 4.5) and time in the open arms (65.6 +/- 6.0 vs 11.1 +/- 1.9) as compared to EPM-1 rats, although the total number of arm entries (9.2 +/- 0.9 vs 9.7 +/- 1.0) was unchanged. These results suggest that the ''anxiolytic behavior'' of SHR rats in relation to normotensive controls is not related to differences in motility levels.
Keywords SPONTANEOUSLY HYPERTENSIVE RATS
OPEN-FIELD
SOCIAL INTERACTION
PLUS-MAZE
Language English
Date 1993-09-01
Published in Brazilian Journal Of Medical And Biological Research. Sao Paulo: Assoc Bras Divulg Cientifica, v. 26, n. 9, p. 965-969, 1993.
ISSN 0100-879X (Sherpa/Romeo, impact factor)
Publisher Assoc Bras Divulg Cientifica
Extent 965-969
Access rights Closed access
Type Article
Web of Science ID WOS:A1993LY94100007
URI http://repositorio.unifesp.br/11600/43043

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