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The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
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Related Experiment Video

Updated: Apr 18, 2026

Restraint to Induce Stress in Mice and Rats
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Embedded synaptic feedback in the neuroendocrine stress axis.

J I Wamsteeker Cusulin1, J S Bains1

  • 1Hotchkiss Brain Institute and the Department of Physiology & Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.

Journal of Neuroendocrinology
|January 24, 2015
PubMed
Summary

The neuroendocrine stress axis regulates glucocorticoids for homeostasis. Glucocorticoids act as

Keywords:
CRHcortisol/corticosteroneendocannabinoidsglucocorticoidsmembrane/nuclearneuropetidesreceptorssynaptictransmission/plasticity

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Area of Science:

  • Neuroendocrinology
  • Neurobiology
  • Physiology

Background:

  • Neural regulation of blood glucocorticoid levels is crucial for maintaining homeostasis during stress.
  • The mammalian neuroendocrine stress axis, involving parvocellular neuroendocrine cells (PNCs) in the hypothalamus, manages this regulation.
  • Glucocorticoids provide feedback to PNCs, influencing neuroendocrine responses based on experience.

Purpose of the Study:

  • To review recent evidence on the metaplastic actions of glucocorticoids.
  • To explore how glucocorticoids act as 'circuit breakers' at synapses regulating PNC excitability.
  • To understand the role of these mechanisms in stress adaptation.

Main Methods:

  • Review of recent scientific literature and evidence.
  • Analysis of synaptic mechanisms involving glucocorticoids and PNCs.
  • Exploration of the functional implications for stress adaptation.

Main Results:

  • Glucocorticoids exhibit metaplastic actions, functioning as 'circuit breakers' at synapses.
  • These actions directly modulate the excitability of parvocellular neuroendocrine cells (PNCs).
  • These synaptic mechanisms are implicated as substrates for stress adaptation.

Conclusions:

  • Glucocorticoids play a critical role in the neural regulation of the stress axis.
  • Metaplastic effects of glucocorticoids at synapses are key to shaping neuroendocrine responses.
  • Understanding these mechanisms is vital for comprehending stress adaptation.