Recurrent stress across life may improve cognitive performance in individual rats, suggesting the induction of resilience

Transl Psychiatry. 2019 Aug 5;9(1):185. doi: 10.1038/s41398-019-0523-5.

Abstract

Depressive symptoms are often accompanied by cognitive impairments and recurrent depressive episodes are discussed as a potential risk for dementia. Especially, stressful life events are considered a potent risk factor for depression. Here, we induced recurrent stress-induced depressive episodes over the life span of rats, followed by cognitive assessment in the symptom-free period. Rats exposed to stress-induced depressive episodes learned faster than control rats. A high degree of stress-induced depressive-like behavior early in the paradigm was a predictor of improved cognitive performance, suggesting induction of resilience. Subsequently, exposure to lorazepam prior to stress-induced depressive episodes and cognitive testing in a nonaversive environment prevented the positive effect. This indicates a beneficial effect of the stress-associated situation, with the existence of individual coping abilities. Altogether, stress may in some have a beneficial effect, yet for those individuals unable to tackle these aversive events, consecutive unpleasant episodes may lead to worse cognitive performance later in life.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anti-Anxiety Agents / pharmacology
  • Behavior, Animal / drug effects
  • Behavior, Animal / physiology*
  • Cognition / drug effects
  • Cognition / physiology*
  • Depression / psychology*
  • Disease Models, Animal
  • Lorazepam / pharmacology
  • Male
  • Rats
  • Rats, Sprague-Dawley
  • Recurrence
  • Resilience, Psychological*
  • Stress, Psychological / psychology*

Substances

  • Anti-Anxiety Agents
  • Lorazepam