Cited by 136Toxic Organic Pollutants ImpactNeuroscience and Neuropharmacology ResearchEffects and risks of endocrine disrupting chemicals

PCB-95 Promotes Dendritic Growth via Ryanodine Receptor–Dependent Mechanisms

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Wayman, Gary A., Yang, Dongren, Bose, Diptiman D., Lesiak, Adam, Ledoux, Veronica, Bruun, Donald, Pessah, Isaac N., Lein, Pamela J.·2012·Environmental Health Perspectives

Abstract

Background: Aroclor 1254 (A1254) interferes with normal dendritic growth and plasticity in the developing rodent brain, but the mechanism(s) mediating this effect have yet to be established. Non-dioxin-like (NDL) polychlorinated biphenyls (PCBs) enhance the activity of ryanodine receptor (RyR) calcium ion (Ca2+) channels, which play a central role in regulating the spatiotemporal dynamics of intracellular Ca2+ signaling. Ca2+ signaling is a predominant factor in shaping dendritic arbors, but whether PCB potentiation of RyR activity influences dendritic growth is not known. Objective: We determined whether RyR activity is required for PCB effects on dendritic growth. Methods and Results: Golgi analysis of hippocampi from weanling rats confirmed that developmental exposure via the maternal diet to NDL PCB-95 (2,2´,3,5´6-pentachlorobiphenyl), a potent RyR potentiator, phenocopies the dendrite-promoting effects of A1254. Dendritic growth in dissociated cultures of primary hippocampal neurons and in hippocampal slice cultures is similarly enhanced by PCB-95 but not by PCB-66 (2,3,4´,4-tetrachlorobiphenyl), a congener with negligible effects on RyR activity. The dendrite-promoting effects of PCB-95 are evident at concentrations as low as 2 pM and are inhibited by either pharmacologic blockade or siRNA knockdown of RyRs. Conclusions: Our findings demonstrate that environmentally relevant levels of NDL PCBs modulate neuronal connectivity via RyR-dependent effects on dendritic arborization. In addition, these findings identify RyR channel dysregulation as a novel mechanism contributing to dysmorphic dendritogenesis associated with heritable and environmentally triggered neurodevelopmental disorders.

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  • NDL PCB congeners modulate dendritic arborization and spine formation, and similar changes in neuronal connectivity have been observed in the autistic brain.

    “Second, NDL PCB congeners modulate dendritic arborization and spine formation [ 107 , 108 ], and similar changes in neuronal connectivity have been observed in the autistic brain [ 109 , 110 ].”
  • A nonmonotonic dose-response relationship has also been reported for NDL PCB effects on dendritic arborization of cultured rat hippocampal neurons and learning and memory deficits in rats exposed throughout gestation and lactation to NDL PCBs in the maternal diet.

    “Interestingly, a nonmonotonic dose–response relationship has also been reported for NDL PCB effects on dendritic arborization of cultured rat hippocampal neurons [ 107 ] and learning and memory deficits in rats exposed throughout gestation and lactation to NDL PCBs in the maternal diet [ 117 ].”

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Authors
Wayman, G. A., Yang, D., Bose, D. D., Lesiak, A., Ledoux, V., Bruun, D., Pessah, I. N., & Lein, P. J.
Affiliations
  • Washington State University (US)
  • University of California, Davis (US)
  • Program in Neuroscience, Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Washington State University, Pullman, Washington, USA
  • Oregon Health & Science University (US)
Corresponding author
Lein, Pamela J.
Venue
Environmental Health Perspectives
Published
2012-04-25
Volume
120
Issue
7
Pages
997-1002
ISSN
  • 0091-6765 (ISSN-L)
  • 1552-9924
OpenAlex
W2057153652
Cited by
136
References
59
Citations by year
2026: 7 · 2025: 2 · 2024: 6 · 2023: 10 · 2022: 11 · 2021: 6 · 2020: 12 · 2019: 14 · 2018: 12 · 2017: 12 · 2016: 8 · 2015: 3 · 2014: 12 · 2013: 15 · 2012: 5
FWCI
7.77
Type
journal article
Language
en
Open access
Locations
  • Environmental Health Perspectives (publishedVersion, public-domain)
  • PubMed Central (publishedVersion, public-domain)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • U.S. Environmental Protection Agency (R-829388, R-833292, R01 ES014901, ES011269)
  • Hope for Depression Research Foundation
  • National Institutes of Health (ES04699, ES014901, ES011269)
  • National Institute of Mental Health (R01MH086032)
  • National Institute of Environmental Health Sciences (P42-ES-04699, P42ES004699, R01ES017425, P01ES011269, R01ES014901, T32ES007060)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Effects and risks of endocrine disrupting chemicals
Keywords
PCB 95, non-dioxin-like polychlorinated biphenyls, ryanodine receptor, dendritic growth, dendritic branching, calcium signaling, Aroclor 1254, hippocampal neurons, neurodevelopmental disorders, developmental neurotoxicity, PCB congeners, maternal dietary exposure
MeSH terms
Animals, Cells, Cultured, Dendrites, Hippocampus, Neurons, Polychlorinated Biphenyls, Ryanodine Receptor Calcium Release Channel, Rats

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