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Environmental toxicant effects on neuroendocrine function.

A C Gore1

  • 1Fishberg Research Center for Neurobiology, and Schwartz Department of Geriatrics and Adult Development, Mount Sinai School of Medicine, New York, NY 10029, USA. andrea.gore@mssm.edu

Endocrine
|June 8, 2001
PubMed
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Environmental toxicants, including endocrine-disrupting chemicals (EDCs), impact neuroendocrine (hypothalamic-pituitary-gonadal) axis function. This study investigates EDC effects on gonadotropin-releasing hormone (GnRH) neurons, revealing direct impacts on gene expression and cell health.

Area of Science:

  • Environmental toxicology
  • Neuroendocrinology
  • Developmental biology

Background:

  • Environmental toxicants can disrupt normal growth and development, affecting reproductive and nervous systems.
  • The neuroendocrine axis, particularly hypothalamic gonadotropin-releasing hormone (GnRH) neurons, is a key mediator of these effects.
  • Endocrine-disrupting chemicals (EDCs) are a class of toxicants with significant developmental impacts.

Purpose of the Study:

  • To review the literature on EDC effects on the neuroendocrine system, focusing on GnRH neurons.
  • To present experimental data on four urban environmental toxicants: Aroclor 1221, Aroclor 1254, methoxychlor, and chlorpyrifos.
  • To investigate the direct effects of these toxicants on GnRH cells in vitro and in vivo.

Main Methods:

Related Experiment Videos

  • Literature review of EDC impacts on the neuroendocrine system.
  • In vitro experiments on a GnRH cell line exposed to toxicants.
  • In vivo experiments assessing GnRH mRNA levels in female rats exposed to toxicants.

    • Main Results:

    • In vitro: Aroclor 1221, Aroclor 1254, methoxychlor, and chlorpyrifos affected GnRH gene expression, cell survival, and neurite outgrowth.
    • In vivo: Aroclor 1221, methoxychlor, and chlorpyrifos significantly altered GnRH mRNA levels in female rats.
    • Chlorpyrifos demonstrated characteristics of an EDC in these experiments.

    Conclusions:

    • The neuroendocrine axis, specifically GnRH neurons, is sensitive to urban environmental toxicants.
    • Reproductive and neurological effects of EDCs may be mediated through the hypothalamic-pituitary-gonadal axis.
    • Findings support the classification of chlorpyrifos as an EDC.