Serum brain-derived neurotrophic factor predicts responses to escitalopram in chronic posttraumatic stress disorder.

Progress in Neuro-psychopharmacology & Biological Psychiatry
William BergerThomas C Neylan

Abstract

Some studies have found that antidepressants increase serum brain-derived neurotrophic factor (BDNF) levels in patients with major depression and the expression of BDNF mRNA in limbic structures of rats. This study addressed whether the SSRI escitalopram increases serum BDNF levels in subjects with PTSD and whether BDNF levels are associated with treatment response. Medically healthy male subjects (N=16) with chronic PTSD completed a 12 week open-label trial of flexible dose (5-20 mg/day) escitalopram monotherapy. BDNF levels were obtained at baseline, and at weeks 4, 8 and 12. PTSD symptoms significantly declined over the course of the 12 week escitalopram treatment. Despite a substantial improvement in PTSD symptoms, there was virtually no change in BDNF levels over time. Nevertheless, mean BDNF levels across the trial were strongly correlated with the slope of PTSD symptoms over the 12 weeks (r=0.58, p=0.018). Lower mean BDNF was associated with a greater decrease in PTSD symptoms over the course of the trial. PTSD subjects with low BDNF levels demonstrated the largest treatment response from an agent with putative neurotrophic effects.

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