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Decrease in the number of high-affinity opiate binding sites during the aging process in Mytilus edulis (Bivalvia).

G B Stefano1

  • 1Department of Natural Sciences, Medgar Evers College, City University of New York, Brooklyn 11225.

Cellular and Molecular Neurobiology
|December 1, 1981
PubMed
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As mussels age, opiate binding sites in their nervous system decrease, impacting dopamine levels and opioid sensitivity. This age-related decline affects how older mussels respond to certain pain-relieving compounds.

Area of Science:

  • Neurobiology
  • Marine Biology
  • Pharmacology

Background:

  • Aging in invertebrates can lead to significant physiological changes.
  • Opiate receptors play crucial roles in nervous system function and response to stimuli.
  • Mytilus edulis (blue mussel) serves as a model organism for studying aging effects in bivalves.

Purpose of the Study:

  • To investigate the age-related changes in stereospecific opiate binding sites within the visceral ganglia of Mytilus edulis.
  • To determine how aging affects the affinity and number of opiate binding sites.
  • To examine the impact of aging on opioid modulation of dopamine levels and neural sensitivity.

Main Methods:

  • Quantification of high-affinity etorphine and naloxone binding sites in visceral ganglia of Mytilus edulis of varying ages.

Related Experiment Videos

  • Assessment of ligand affinity for opiate receptors.
  • Measurement of dopamine level augmentation by opioids and neural sensitivity to etorphine and DAMA in aged versus young mussels.

    • Main Results:

    • A significant decrease in the number of stereospecific opiate binding sites was observed with age.
    • High-affinity etorphine sites decreased by 30%, and naloxone sites decreased by 23%.
    • Older mussels showed reduced opioid-induced dopamine level augmentation and decreased sensitivity to etorphine and DAMA.

    Conclusions:

    • Aging in Mytilus edulis is associated with a decline in opiate receptor numbers in the visceral ganglia.
    • This decline correlates with altered dopamine signaling and reduced neural responsiveness to opioids in older individuals.
    • These findings suggest age-dependent neurochemical changes impacting opioid pathways in bivalves.