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Related Experiment Videos

Does the amygdala modulate adaptation to repeated stress?

R N Carter1, S B Pinnock, J Herbert

  • 1Department of Anatomy, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK.

Neuroscience
|May 18, 2004
PubMed
Summary

The amygdala is not essential for the rat

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Area of Science:

  • Neuroscience
  • Stress Physiology
  • Behavioral Endocrinology

Background:

  • Restraint stress activates the hypothalamic-pituitary-adrenal (HPA) axis, alters brain gene expression (c-fos), and increases cardiovascular function in rats.
  • Repeated stress exposure leads to adaptation, characterized by habituation of corticosterone secretion and changes in hypothalamic gene expression.
  • The neural mechanisms underlying stress response adaptation are not fully understood, prompting investigation into the amygdala's potential role.

Purpose of the Study:

  • To investigate the role of the amygdala in the acute and adaptive responses to restraint stress in male rats.
  • To determine if amygdala lesions affect HPA axis activation, c-fos expression, and cardiovascular responses to acute and repeated restraint.

Main Methods:

  • Male rats underwent either large neurotoxic lesions or discrete lesions of the central nucleus of the amygdala.
  • Acute and repeated restraint stress paradigms were employed to assess HPA axis activation (corticosterone, c-fos mRNA), and cardiovascular function (telemetry).
  • Changes in corticosterone levels, c-fos mRNA expression in the paraventricular nucleus of the hypothalamus (PVN), and heart rate were measured.

Main Results:

  • Large amygdala lesions did not prevent acute HPA axis activation, while central nucleus lesions exacerbated it.
  • Rats with large amygdala lesions showed delayed habituation of corticosterone and c-fos responses to repeated restraint.
  • Neither lesion type significantly altered acute or repeated restraint-induced tachycardia.

Conclusions:

  • The amygdala and its central nucleus are not essential for acute HPA axis and cardiovascular responses to restraint stress.
  • The central nucleus may play a modulatory role in the acute stress response.
  • Adaptation to repeated stress is only modestly dependent on the amygdala, suggesting other neural circuits mediate habituation.

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