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Locus coeruleus activation by physiological challenges

M E Page1, R J Valentino

  • 1Department of Mental Health Sciences, Hahnemann University, Philadelphia, PA 19102.

Brain Research Bulletin
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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Physiological challenges activate noradrenergic locus coeruleus (LC) neurons through distinct pathways. Corticotropin-releasing factor (CRF) mediates hypotension effects, while excitatory amino acids mediate bladder distention effects, influencing arousal.

Area of Science:

  • Neuroscience
  • Physiology

Background:

  • The noradrenergic locus coeruleus (LC) plays a crucial role in arousal and stress responses.
  • Understanding the neural mechanisms underlying LC activation by physiological challenges is essential for comprehending stress and arousal regulation.

Purpose of the Study:

  • To investigate the specific neurotransmitter systems and neural circuitry involved in activating LC neurons during hypotension and bladder distention.
  • To determine the functional consequences of LC activation on brain activity and arousal.

Main Methods:

  • Utilized halothane-anesthetized rats subjected to hypotensive challenges and bladder distention.
  • Administered antagonists for corticotropin-releasing factor (CRF) and excitatory amino acids centrally (ICV) and directly into the LC.
  • Recorded electroencephalographic (EEG) activity from the frontal cortex and monitored LC neuronal discharge rates.

Related Experiment Videos

  • Performed bilateral LC inactivation to assess its role in physiological challenge-induced activation.

    • Main Results:

    • Hypotension and bladder distention both increased LC spontaneous discharge rate and forebrain EEG activity.
    • CRF antagonists blocked LC activation by hypotension, while excitatory amino acid antagonists blocked LC activation by bladder distention.
    • LC inactivation or CRF antagonist infusion into the LC prevented both LC and EEG activation during hypotension.
    • EEG changes indicated a shift towards higher frequency, lower amplitude activity, consistent with increased arousal.

    Conclusions:

    • LC activation by different physiological challenges involves distinct neurotransmitter systems: CRF for hypotension and excitatory amino acids for bladder distention.
    • LC activation during physiological challenges contributes to increased or maintained arousal, as evidenced by EEG changes.
    • These findings elucidate the differential neurochemical regulation of LC activity during stress and its role in arousal.