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Lightly chlorinated ortho-substituted PCB congeners decrease dopamine in nonhuman primate brain and in tissue

R F Seegal1, B Bush, W Shain

  • 1New York State Department of Health, Wadsworth Center for Laboratories and Research, Albany 12201-0509.

Toxicology and Applied Pharmacology
|October 1, 1990
PubMed
Summary
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Exposure to certain polychlorinated biphenyls (PCBs) reduced dopamine levels in primate brains. Specific nonplanar PCB congeners, not dioxin-like ones, were identified as the likely cause.

Area of Science:

  • Neurotoxicology
  • Environmental Health
  • Biochemistry

Background:

  • Polychlorinated biphenyls (PCBs) are environmental contaminants with known neurotoxic effects.
  • Previous research suggests PCBs can impact dopamine pathways, but specific mechanisms remain unclear.
  • Aroclor 1016 is a commercial PCB mixture containing various congeners.

Purpose of the Study:

  • To investigate the effects of Aroclor 1016 exposure on dopamine concentrations in nonhuman primates (Macaca nemestrina).
  • To identify specific PCB congeners responsible for observed neurochemical changes.
  • To elucidate the mechanism by which PCBs alter dopamine function.

Main Methods:

  • Nonhuman primates were exposed to Aroclor 1016.
  • Dopamine concentrations were measured in specific brain regions (caudate, putamen, substantia nigra, hypothalamus).

Related Experiment Videos

  • PCBs were analyzed in brain tissue.
  • In vitro studies exposed PC-12 pheochromocytoma cells to specific PCB congeners.

    • Main Results:

    • Aroclor 1016 exposure decreased dopamine concentrations in multiple brain regions.
    • Three specific ortho-substituted nonplanar PCB congeners were detected in the brain.
    • In vitro, these three congeners reduced dopamine synthesis in PC-12 cells, while planar congeners did not.
    • The mechanism appears distinct from the Ah-receptor pathway.

    Conclusions:

    • Ortho-substituted nonplanar PCB congeners are likely responsible for decreased dopamine levels observed in primates.
    • These specific PCB congeners may directly alter dopamine synthesis.
    • The neurotoxic mechanism of these PCBs may be novel and not mediated by the Ah-receptor complex.