Abstract
The therapeutic value of β-adrenoceptor blockage, using propranolol, in the aftermath of traumatic experience is uncertain. A prospective, controlled animal model of posttraumatic stress disorder (PTSD) was employed to assess the effects of propranolol on long-term behavioral responses to stress. Animals exposed to predator scent stress received a single bolus of propranolol (10 or 15. mg/kg) or vehicle 1. h post-exposure. Outcomes were assessed using the elevated plus-maze (EPM) and acoustic startle response (ASR) at 30. days and freezing response to a trauma reminder (unsoiled litter) on Day 31. Individual animals were classified as having "extreme", "partial" and "minimal" behavioral responses, according to pre-set cut-off criteria for EPM and ASR response patterns. The physiological efficacy of the doses of propranolol was verified by collecting cardiovascular data telemetrically (from exposed or unexposed individuals given propranolol or vehicle). The effect of propranolol on long-term memory was verified using a non-spatial memory task. Both doses of propranolol effectively reduced mean heart rate and impaired the object-recognition task, as expected. No significant effect on prevalence rates of PTSD-like behavioral responses or on trauma reminder response was observed for either dose of propranolol as compared to vehicle. Despite adequate efficacy in terms of heart rate and disruption of memory, single-dose, post-stress β-blockage with propranolol was ineffective in reducing onset of PTSD-like behavioral disruption and trauma cue responses in the long term. Traumatic stress-related processes appear to be affected differently than the others.
Original language | English |
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Pages (from-to) | 230-240 |
Number of pages | 11 |
Journal | European Neuropsychopharmacology |
Volume | 21 |
Issue number | 3 |
DOIs | |
State | Published - 1 Mar 2011 |
Keywords
- Animal model
- Heart rate
- Memory consolidation
- Nadolol
- Post-traumatic stress disorder
- Propranolol
- Secondary prevention
- β-adrenoceptor antagonists
ASJC Scopus subject areas
- Pharmacology
- Neurology
- Clinical Neurology
- Psychiatry and Mental health
- Biological Psychiatry
- Pharmacology (medical)