Behavioral effects of chronic stress in Carioca high- and low-conditioned freezing rats.
Stress
; 24(5): 602-611, 2021 09.
Article
em En
| MEDLINE
| ID: mdl-34030584
ABSTRACT
Chronic unpredictable mild stress (CUMS) is a widely used model to study stress-coping strategies in rodents. Different factors have been shown to influence whether animals adopt passive or active coping responses to CUMS. Individual adaptation and susceptibility to the environment seem to play a critical role in this process. To further investigate this relationship, we examined the effects of CUMS on Carioca high- and low-conditioned freezing rats (CHF and CLF, respectively), bidirectional lines of animals selected for high and low freezing in response to contextual cues that were previously associated with footshocks. For this purpose, the behavior of CHF and CLF animals was evaluated in the contextual fear conditioning, open field, elevated T maze, and forced swimming tests before and after 21 days of CUMS. For all tests, CHF rats were more susceptible to the effects of CUMS compared to CLF. CHF animals exposed to CUMS displayed a reduction in freezing behavior, decreased number of entries and time spent in the center of the open field, greater latencies to become immobile, and increased avoidance and escaping behaviors in the elevated T maze. Overall, these findings support the hypothesis that a heightened susceptibility to the environment exerts a strong influence on coping responses to chronic stress.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Estresse Psicológico
/
Medo
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Stress
Assunto da revista:
NEUROLOGIA
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Brasil