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Opioid receptor subtypes that mediate a microwave-induced decrease in central cholinergic activity in the rat.

H Lai1, M A Carino, A Horita

  • 1Department of Pharmacology, University of Washington School of Medicine, Seattle 98195.

Bioelectromagnetics
|January 1, 1992
PubMed
Summary
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Acute microwave exposure affects brain cholinergic activity. All three opioid receptor subtypes (mu, delta, kappa) are involved in the hippocampus, but not the frontal cortex, indicating distinct neural pathways.

Area of Science:

  • Neuroscience
  • Electromagnetic field effects
  • Pharmacology

Background:

  • Pulsed microwave exposure is known to affect brain function.
  • Cholinergic activity plays a crucial role in cognitive processes.
  • Opioid receptors are implicated in various neurological responses.

Purpose of the Study:

  • To investigate the role of mu, delta, and kappa opioid receptor subtypes in the brain's response to acute pulsed microwave exposure.
  • To determine the impact of microwave exposure on cholinergic activity in specific brain regions (hippocampus and frontal cortex).

Main Methods:

  • Rats were exposed to acute pulsed microwave radiation (2,450 MHz).
  • Specific antagonists for mu, delta, and kappa opioid receptors were microinjected into the lateral cerebroventricle.

Related Experiment Videos

  • Cholinergic activity in the hippocampus and frontal cortex was measured post-exposure.

    • Main Results:

    • Microwave exposure led to a decrease in cholinergic activity in the rat hippocampus.
    • This decrease in hippocampal cholinergic activity was significantly modulated by antagonists of all three opioid receptor subtypes (mu, delta, kappa).
    • Microwave-induced decrease in cholinergic activity in the frontal cortex was not affected by opioid receptor antagonists.

    Conclusions:

    • All three major opioid receptor subtypes (mu, delta, kappa) mediate the effects of pulsed microwave exposure on hippocampal cholinergic activity.
    • The effects of microwaves on frontal cortex cholinergic activity are not mediated by endogenous opioids, suggesting alternative mechanisms.