Volume 8, Issue 6 (November & December 2017)
BCN 2017, 8(6): 493-502 |
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Ghasemi M, Abrari K, Goudarzi I, Rashidy-Pour A. Effect of WIN55-212-2 and Consequences of Extinction Training on Conditioned Fear Memory in PTSD Male Rats. BCN 2017; 8 (6) :493-502
URL: http://bcn.iums.ac.ir/article-1-750-en.html
URL: http://bcn.iums.ac.ir/article-1-750-en.html
1- Department of Physiology, School of Biology, Damghan University, Damghan, Iran.
2- Physiology Research Center, Semnan University of Medical Sciences, Semnan, Iran.
2- Physiology Research Center, Semnan University of Medical Sciences, Semnan, Iran.
Abstract:
Introduction: This study investigates the effects of cannabinoid agonist WIN55-212-2 on acquisition and consolidation phases of the fear memory extinction and also on anxiety and motor activity.
Methods: In this study, we used SPS & S model to induce post-traumatic stress disorder. One week after SPS, to establish a conditioned fear memory, rats received an electric foot shock within shock chamber. After 24 h, for extinction training, the rats were placed back to the chamber for 9 min, without receiving any shock. In 3 consecutive days and on days 17, 24 and 37, extinction tests were carried out and the freezing behavior was evaluated. Thirty minutes before the first three extinction tests, animals received IP injections of WIN or vehicle. Anxiety-like behavior examined with elevated plus-maze and motor activity with open field, 32 days after conditioning.
Results: Exaggerated and continued conditioned fear memory observed in SPS & S group compared with shock group. IP injection of a 0.25 mg/kg dose of WIN before extinction training led to reducing fear responses in animals.
Conclusion: IP injection of WIN increased acquisition or consolidation of fear memory extinction. SPS & S caused anxiety and this effect improved by the agonist (0.25 mg/kg).
Type of Study: Original |
Subject:
Behavioral Neuroscience
Received: 2016/04/1 | Accepted: 2017/01/2 | Published: 2017/11/1
Received: 2016/04/1 | Accepted: 2017/01/2 | Published: 2017/11/1
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