Anxiolytic-like effects of Atenolol injected into the nucleus accumbens septi in rats after restrain stress in the elevated plus maze test
DOI:
https://doi.org/10.61695/rcs.v1i1.8Keywords:
Atenolol, Plus-maze, Glutamate, Accumbens, Anxiety, SchizophreniaAbstract
Objetives: Previously, we observed that the injection of glutamate antagonists injected within the Nucleus Accumbens Septi (NAS) produced an anxiolytic-like effect in the elevated plus maze (EPM) test in basal non-disturbed state rats. The effect of metoprolol, a specific Beta-1 Adrenoreceptor antagonist in the EPM, was studied previously in a resting condition in male rats bilaterally cannulated in the NAS. Methods: Rats were previously submitted to restrain stress and divided into four groups. They received bilaterally 1 μl injections of saline (n=13) or atenolol in different doses within the NAS: 0.75 (n=15), 1 (n=13) and 2 µg/1 µl (n=13), 15 min before testing. Rats were maintained under restrain between injection and test. Results: Time Spent in the Open Arm (TSOA) was modified by treatment (F = 4.239, p = 0.0096, df = 3) and increased by the medium dose group when it was compared with the saline group (p<0.05) and the lowest dose group (p<0.01). Open arms entries (OAE) were modified by treatment (F = 3.461, p = 0.0231, df = 3). This parameter was increased by the medium dose of atenolol (p<0.05) when compared to saline and the lowest dose. No significant differences were observed in other parameters studied. Conclusion: We conclude that atenolol beta-1 receptor blockade within the NAS after restraint leads to an anxiolytic-like effect related to an increase in the Time Spent in the Open Arm (TSOA), and behavioural disinhibition, evidenced in the increase in the Open Arm Entries (OAE), showing a specific behavioural pattern.
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Copyright (c) 2023 Luis Hernán Llano López, Miriam Fraile, Adriana Inés Landa, Norman Darío López Velásquez, Manuel Alejandro Guevara, José Vicente Lafuente Sánchez, Pascual Ángel Gargiulo
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