Endogenous opioids: opposing stress with a cost

Area of Science:

• Neuroscience
• Endocrinology
• Physiology

Background:

• The stress response is a conserved survival mechanism involving neural systems.
• Chronic stress leads to stress response circuit dysfunction and pathology.
• Stress systems are balanced by neuromodulators with opposing effects to maintain homeostasis.

Purpose of the Study:

• To review the dynamic interplay of opposing neuromodulatory systems in stress response.
• To examine the role of endogenous opioids in modulating the stress response.
• To illustrate how these modulatory actions can be both protective and detrimental.

Main Methods:

• Literature review focusing on the neurobiology of stress.
• Analysis of the interaction between endogenous opioids and corticotropin-releasing hormone (CRH).
• Examination of evidence for protective and hazardous effects of opioid modulation during stress.

Main Results:

• Endogenous opioids oppose the actions of CRH, a key stress mediator.
• Opioid systems promote recovery from acute stress responses.
• The engagement of opposing systems, while beneficial for recovery, can lead to other dysfunctions.

Conclusions:

• The balance between stress-activating and stress-dampening systems is crucial for health.
• Endogenous opioids exemplify this balance, offering protection but also posing risks.
• Understanding these dynamics is key to addressing stress-related pathologies.