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Toxins and fetal brain damage



Type of Spiritual Experience


Various sorts of brain damage can occur leading to all the varieties shown on the site - autism, manic depression and so on

A description of the experience

Neurotoxicology. 2010 Sep;31(5):589-97. doi: 10.1016/j.neuro.2010.03.007. Epub 2010 Apr 8  Gene-chemical interactions in the developing mammalian nervous system: Effects on proliferation, neurogenesis and differentiation. Fox DA1, Opanashuk L, Zharkovsky A, Weiss B. University of Houston, College of Optometry, Department of Biology and Biochemistry, 4901 Calhoun Road, Houston, TX 77024-2020, USA. dafox@uh.edu

The orderly formation of the nervous system requires a multitude of complex, integrated and simultaneously occurring processes. Neural progenitor cells expand through proliferation, commit to different cell fates, exit the cell cycle, generate different neuronal and glial cell types, and new neurons migrate to specified areas and establish synaptic connections. Gestational and perinatal exposure to environmental toxicants, pharmacological agents and drugs of abuse produce immediate, persistent or late-onset alterations in behavioral, cognitive, sensory and/or motor functions. These alterations reflect the disruption of the underlying processes of CNS formation and development.

To determine the neurotoxic mechanisms that underlie these deficits it is necessary to analyze and dissect the complex molecular processes that occur during the proliferation, neurogenesis and differentiation of cells.

This symposium will provide a framework for understanding the orchestrated events of neurogenesis, the coordination of proliferation and cell fate specification by selected genes, and the effects of well-known neurotoxicants on neurogenesis in the retina, hippocampus and cerebellum. These three tissues share common developmental profiles, mediate diverse neuronal activities and function, and thus provide important substrates for analysis. This paper summarizes four invited talks that were presented at the 12th International Neurotoxicology Association meeting held in Jerusalem, Israel during the summer of 2009.

  • Donald A. Fox described the structural and functional alterations following low-level gestational lead exposure in children and rodents that produced a supernormal electroretinogram and selective increases in neurogenesis and cell proliferation of late-born retinal neurons (rod photoreceptors and bipolar cells), but not Müller glia cells, in mice.
  • Lisa Opanashuk discussed how dioxin [TCDD] binding to the arylhydrocarbon receptor [AhR], a transcription factor that regulates xenobiotic metabolizing enzymes and growth factors, increased granule cell formation and apoptosis in the developing mouse cerebellum.
  • Alex Zharkovsky described how postnatal early postnatal lead exposure decreased cell proliferation, neurogenesis and gene expression in the dentate gyrus of the adult hippocampus and its resultant behavioral effects.
  • Bernard Weiss illustrated how environmental endocrine disruptors produced age- and sex-dependent alterations in synaptogenesis and cognitive behavior.

Copyright © 2010 Elsevier Inc. All rights reserved.

PMID: 20381523

The source of the experience

Other ill or disabled person

Concepts, symbols and science items



Science Items

Endocrine disruptors

Activities and commonsteps