Propranolol failed to prevent severe stress-induced long-term behavioral changes in male rats.

Autor: Careaga MBL; Departamento de Psicobiologia, Universidade Federal de São Paulo/Escola Paulista de Medicina - UNIFESP/EPM, São Paulo, Brazil., Girardi CEN; Departamento de Psicobiologia, Universidade Federal de São Paulo/Escola Paulista de Medicina - UNIFESP/EPM, São Paulo, Brazil., Suchecki D; Departamento de Psicobiologia, Universidade Federal de São Paulo/Escola Paulista de Medicina - UNIFESP/EPM, São Paulo, Brazil. Electronic address: deborah.suchecki21@unifesp.br.
Jazyk: angličtina
Zdroj: Progress in neuro-psychopharmacology & biological psychiatry [Prog Neuropsychopharmacol Biol Psychiatry] 2021 Jun 08; Vol. 108, pp. 110079. Date of Electronic Publication: 2020 Aug 19.
DOI: 10.1016/j.pnpbp.2020.110079
Abstrakt: Memories of adverse events can be maladaptive when they lead to exaggerated fear, as observed in post-traumatic stress disorder (PTSD). Fear conditioning and fear sensitization are learning processes thought to play a role in fear-related disorders, and only few animal studies have evaluated the relationship between the associative and non-associative fear memory components on the development and maintenance of PTSD-like behavioral changes. Here we assessed the effects of a single dose of propranolol (10 mg/kg) or saline after fear memory retrieval on the long-term behavioral responses induced by severe stress in male rats. Animals were submitted to contextual fear conditioning (delayed shock group) or not (non-shock group) and underwent fear memory retrieval followed by propranolol or saline administration two weeks later. Rats were then evaluated in different behavioral tests to assess the expression of the conditioned fear response, anxiety-like and exploratory behaviors, and fear response after the presentation of unknown acoustic stimulus. Post-retrieval propranolol did not disrupt the subsequent expression of neither conditioned fear response nor the exploratory deficit and fear sensitization response, indicating that propranolol failed to mitigate long-term behavioral changes induced by severe stress in rats.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: