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Stressors produce a concurrent decrease and increase in reflex amplitude in rats treated with naloxone.

P H Warren, W Pilcher, R Coopersmith

    Life Sciences
    |September 24, 1984
    PubMed
    Summary
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    Inescapable foot shock altered pain and startle responses in rats. Opioid antagonist naloxone affected startle responses to tones but not shocks, suggesting non-opioid pathways mediate some stress-induced changes.

    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Pain Research

    Background:

    • Stress significantly impacts physiological and behavioral responses.
    • Endogenous opioid systems play a crucial role in pain modulation and stress responses.
    • Understanding stress-induced alterations in sensory processing is vital for comprehending complex behavioral adaptations.

    Purpose of the Study:

    • To investigate the effects of inescapable foot shock on pain sensitivity and startle responses in rats.
    • To determine the role of endogenous opioids in mediating these stress-induced changes.
    • To examine how stress influences responses to different sensory modalities (shock vs. tone).

    Main Methods:

    • Rats were exposed to 25 minutes of inescapable foot shock as a stressor.

    Related Experiment Videos

  • Tail-flick latency was measured to assess pain sensitivity.
  • Startle responses to brief electric tail shocks and auditory tones were recorded.
  • The effects of the opioid antagonist naloxone were evaluated.

    • Main Results:

    • Inescapable foot shock increased tail-flick latency, an effect blocked by naloxone.
    • The stressor significantly diminished the startle response to electric shock, an effect not reduced by naloxone.
    • Naloxone administration resulted in an increased startle response to tones following stress.
    • Tones preceding shocks facilitated the startle response to shocks post-stress, independent of naloxone.

    Conclusions:

    • Stress-induced analgesia appears to involve endogenous opioids.
    • Alterations in startle responses to different sensory stimuli following stress are not solely mediated by endogenous opioids.
    • These findings highlight the complex, multi-faceted neurobiological mechanisms underlying stress responses.