Acute restraint differently alters defensive responses and fos immunoreactivity in the rat brain
| Autor: | Renata O. Abrão, Marcia Carvalho Garcia, Juliana Olivetti Guimarães Nascimento, Milena de Barros Viana, J.S. de Andrade, Isabel Cristina Céspedes, Regina Celia Spadari-Bratfisch, R. da Silva, L.L. Melo |
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| Rok vydání: | 2012 |
| Předmět: |
Male
Restraint Physical Hypothalamo-Hypophyseal System Pituitary-Adrenal System Anxiety Amygdala Periaqueductal gray Behavioral Neuroscience chemistry.chemical_compound Dorsal raphe nucleus Escape Reaction Corticosterone Avoidance Learning medicine Animals Rats Wistar Brain Chemistry Locus Ceruleus Immunohistochemistry Rats Oncogene Proteins v-fos medicine.anatomical_structure Anxiogenic chemistry Hypothalamus Data Interpretation Statistical Psychology Neuroscience Stress Psychological Basolateral amygdala |
| Zdroj: | Behavioural Brain Research. 232:20-29 |
| ISSN: | 0166-4328 |
| DOI: | 10.1016/j.bbr.2012.03.034 |
| Popis: | Results from a previous study show that rats exposed to acute restraint display anxiogenic-like behavior, evidenced by facilitation of avoidance responses in the elevated T-maze (ETM) model of anxiety. In contrast, escape responses were unaltered by stress exposure. Since ETM avoidance and escape tasks seem to activate distinct sets of brain structures, it is possible that the differences observed with acute restraint are due to particularities in the neurobiological mechanisms which modulate these responses. In the present study, analysis of fos protein immunoreactivity (fos-ir) was used to map areas activated by exposure of male Wistar rats to restraint stress (30 min) previously (30 min) to the ETM. Corticosterone levels were also measured in stressed and non-stressed animals. Confirming previous observations restraint facilitated avoidance performance, an anxiogenic result, while leaving escape unaltered. Performance of the avoidance task increased fos-ir in the frontal cortex, intermediate lateral septum, basolateral amygdala, basomedial amygdala, lateral amygdala, anterior hypothalamus and dorsal raphe nucleus. In contrast, performance of escape increased fos-ir in the ventromedial hypothalamus, dorsolateral periaqueductal gray and locus ceruleus. Both behavioral tasks also increased fos-ir in the dorsomedial hypothalamus. Restraint significantly raised corticosterone levels. Additionally after restraint, fos-ir was predominantly seen in the basolateral amygdala and dorsal raphe of animals submitted to the avoidance task. This data confirms that different sets of brain structures are activated by ETM avoidance and escape tasks and suggests that acute restraint differently alters ETM behavior and the pattern of fos activation in the brain. |
| Databáze: | OpenAIRE |
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