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Chronic stress hormones (CORT) initially impair survival behaviors. However, the brain adapts through synaptic scaling, preserving defensive responses to threats despite persistent stress.

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Area of Science:

  • Neuroscience
  • Stress Physiology
  • Behavioral Biology

Background:

  • Chronic stress and elevated corticosteroids (CORT) impact physiological and behavioral responses.
  • The effect of prolonged CORT exposure on survival behaviors during acute stress is not fully understood.
  • Corticotropin-releasing hormone neurons (CRH) in the paraventricular nucleus of the hypothalamus (PVN) are key regulators of stress responses.

Purpose of the Study:

  • To investigate the impact of short-term and long-term CORT exposure on innate defensive behaviors.
  • To elucidate the neural mechanisms underlying behavioral adaptation to chronic stress.
  • To determine if survival-promoting behaviors are maintained despite suppressed CRH neuron activity.

Main Methods:

  • Aerial predator threat model in rodents.
  • In vivo calcium imaging and whole-cell electrophysiology.
  • Chemogenetics and computational modeling.

Main Results:

  • Short-term CORT exposure blunts CRH neuron activity and defensive behaviors via negative feedback.
  • Long-term CORT exposure leads to behavioral recovery despite persistent low CRH neuron activity.
  • Homeostatic scaling of glutamate synapses in CRH neurons overcomes CORT inhibition, preserving system output.

Conclusions:

  • Homeostatic synaptic scaling is a crucial local adaptive mechanism in the brain.
  • This scaling preserves the function of essential survival circuits during chronic stress.
  • The brain demonstrates resilience by adapting neural circuits to maintain vital defensive responses.