Cited by 292Pesticide Exposure and ToxicityNicotinic Acetylcholine Receptors StudyAnesthesia and Neurotoxicity Research

Developmental cholinotoxicants: nicotine and chlorpyrifos

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Slotkin, T A·1999·Environmental Health Perspectives

Abstract

The stimulation of cholinergic receptors in target cells during a critical developmental period provides signals that influence cell replication and differentiation. Accordingly, environmental agents that promote cholinergic activity evoke neurodevelopmental damage because of the inappropriate timing or intensity of stimulation. Nicotine evokes mitotic arrest in brain cells possessing high concentrations of nicotinic cholinergic receptors. In addition, the cholinergic overstimulation programs the expression of genes that evoke apoptosis and delayed cell loss. Effects of cholinesterase inhibitors exhibit many similarities to those of nicotine. Chlorpyrifos administered to developing rats in doses that do not evoke signs of overt toxicity decreased DNA synthesis and caused shortfalls in cell numbers in brain regions enriched in cholinergic innervation. In embryo cultures, chlorpyrifos also evoked apoptosis during neurulation. However, chlorpyrifos also evokes noncholinergic disruption of cell development by interfering with cell signaling via adenylyl cyclase, leading to widespread disruption that is not limited to cholinergic systems. We have tested this hypothesis in vitro with PC12 cells, which lack the enzymes necessary to produce chlorpyrifos oxon, the metabolite that inhibits cholinesterase. Chlorpyrifos inhibited DNA synthesis in undifferentiated PC12 cells, which have relatively few cholinergic receptors. Furthermore, chlorpyrifos was more effective than nicotine and its effects were not blocked by cholinergic antagonists. When cells were allowed to differentiate in the presence of chlorpyrifos, cell replication was inhibited even more profoundly and cell acquisition was arrested. At higher concentrations, chlorpyrifos also inhibited neuritic outgrowth. Thus, chlorpyrifos elicits damage by both noncholinergic and cholinergic mechanisms extending from early stages of neural cell replication through late stages of axonogenesis and terminal differentiation. Accordingly, the window of developmental vulnerability to chlorpyrifos is likely to extend from the embryonic period into postnatal life.

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  1. Yanai J. Neurobehavioral Teratology. Amsterdam:Elsevier, 1984.

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Authors
Slotkin, T. A.
Affiliations
Duke University (US)
Corresponding author
Slotkin, T A
Venue
Environmental Health Perspectives
Published
1999-02
Volume
107
Issue
suppl 1
Pages
71-80
ISSN
  • 0091-6765 (ISSN-L)
  • 1552-9924
OpenAlex
W2030842083
Cited by
292
References
111
Citations by year
2024: 1 · 2023: 5 · 2022: 3 · 2021: 11 · 2020: 4 · 2019: 2 · 2018: 5 · 2017: 4 · 2016: 4 · 2015: 9 · 2014: 4 · 2013: 12 · 2012: 9
FWCI
2.00
Type
journal article
Language
en
Open access
Licence
public-domain
Locations
  • Environmental Health Perspectives (publishedVersion, public-domain)
  • Environmental Health Perspectives (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Pesticide Exposure and Toxicity
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Developmental Neuroscience › Anesthesia and Neurotoxicity Research
Keywords
nicotine, chlorpyrifos, developmental neurotoxicity, cholinergic receptors, nicotinic acetylcholine receptors, cholinesterase inhibitors, apoptosis, neurulation, adenylyl cyclase signaling, PC12 cells, neurite outgrowth, cell differentiation, DNA synthesis inhibition, neurodevelopmental damage
MeSH terms
Animals, Brain, Cholinesterase Inhibitors, DNA, Chlorpyrifos, Humans, Insecticides, Nicotine, Parasympathetic Nervous System, PC12 Cells, Neurotransmitter Agents, Rats

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