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Measurements of Physiological Stress Responses in C. Elegans
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The human stress response.

Georgina Russell1, Stafford Lightman2

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The human stress response, regulated by the hypothalamic-pituitary-adrenal axis, involves cortisol. While acute stress aids survival, chronic stress leads to maladaptive cortisol levels, causing various health issues.

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Area of Science:

  • Neuroendocrinology
  • Physiology
  • Chronobiology

Background:

  • The human stress response maintains homeostasis via neural and hormonal systems synchronized with biological clocks.
  • The hypothalamic-pituitary-adrenal (HPA) axis is central to stress response regulation.
  • Cortisol, the HPA axis end product, exhibits pulsatile secretion and circadian patterns.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of the human stress response.
  • To examine the role of the HPA axis and cortisol in acute and chronic stress.
  • To discuss the implications of stress response modulation in disease and therapeutics.

Main Methods:

  • Review of neuroendocrine and hormonal regulation of stress.
  • Analysis of cortisol secretion patterns and HPA axis dynamics under stress.
  • Discussion of physiological changes associated with chronic stress exposure.

Main Results:

  • Acute stress elevates cortisol, maintaining pulsatility and aiding survival.
  • Chronic inflammatory stress can lead to sustained high cortisol despite normalized adrenocorticotropic hormone (ACTH) levels.
  • Chronic stress alters HPA axis activation (CRH to AVP dominance) and reduces cortisol metabolism, maintaining elevated cortisol.

Conclusions:

  • Acute cortisol elevation is adaptive (fight-or-flight).
  • Chronic cortisol exposure becomes maladaptive, contributing to metabolic syndrome, obesity, cancer, mental health disorders, cardiovascular disease, and infections.
  • Understanding neuroimmunoendocrine modulation and glucocorticoid therapeutics is crucial for managing stress-related diseases.