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Steady electrocorticogram characteristics predict specific stress-induced behavioral phenotypes.

Laura Desnouveaux1, Betty Poly2, Mathilde Edmond2

  • 1Unité de Développements Analytiques et Bioanalyse, Département Plateformes et Recherche Technologique, Institut de Recherche Biomédicale des Armées (IRBA), Brétigny-sur-Orge, France.

Frontiers in Neuroscience
|April 28, 2023
PubMed
Summary

Researchers developed a multisensorial stress model (MSS) in rats to predict stress-induced phenotypes. Pre-stress electrocorticogram (ECoG) biomarkers accurately identified individual stress responses, paving the way for preventive medicine.

Keywords:
EEGfearmultisensorial stressthetavulnerabilityβ2

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Stress Research

Background:

  • Predicting individual responses to intense stressors is crucial for preventing stress-induced pathologies.
  • An ethological model, the multisensorial stress model (MSS), was developed to simulate predator exposure in rats.
  • The study investigates the potential of electrocorticogram (ECoG) recordings to predict stress-induced phenotypes.

Purpose of the Study:

  • To determine if MSS exposure can induce stress-induced phenotypes in rats.
  • To ascertain if pre-stress ECoG recordings can predict observed phenotypes after stress exposure.
  • To identify specific ECoG biomarkers associated with different stress response patterns.

Main Methods:

  • Forty-five Sprague Dawley rats were instrumented with ECoG telemetry.
  • The Stress group (n=23) was exposed to an MSS combining predator-associated sensory stimuli.
  • The Sham group (n=22) served as a control. Both groups were re-exposed to a context with a traumatic object reminder to measure freezing and avoidance behaviors.

Main Results:

  • In the Stress group, 39% developed fear memory, 26% developed avoidance and anhedonia, and 35% recovered.
  • Pre-stress ECoG biomarkers were identified that accurately predicted cluster membership.
  • Decreased frontal Low θ power correlated with resilience, increased frontal Low θ power with fear memory, and decreased parietal β2 frequency with the avoidant-anhedonic phenotype.

Conclusions:

  • The study successfully identified distinct stress-induced phenotypes in rats using the MSS.
  • Pre-stress ECoG recordings contain predictive biomarkers for individual stress responses.
  • These findings support the development of preventive strategies for stress-induced diseases based on ECoG analysis.