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Related Experiment Videos

Lead-induced developmental changes in AP-1 DNA binding in rat brain

K R Pennypacker1, Y Xiao, R H Xu

  • 1University of South Florida, Department of Pharmacology, Tampa 33612, USA.

International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience
|June 1, 1997
PubMed
Summary

Lead exposure in early development harms brain growth and function. This study found lead increases activator protein 1 (AP-1) DNA binding in specific rat brain regions, potentially altering gene expression.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Developmental Biology

Background:

  • Lead exposure during early development is linked to brain abnormalities and neurological disorders.
  • The precise biochemical mechanisms underlying lead's neurotoxicity remain unclear but may involve genomic alterations.
  • Aberrant gene expression is a reported consequence of developmental lead exposure.

Purpose of the Study:

  • To investigate the impact of perinatal lead exposure on the DNA binding activity of the activator protein 1 (AP-1) transcription factor in the developing rat brain.
  • To determine if lead exposure alters AP-1 binding in specific brain regions and at different developmental time points.

Main Methods:

  • Perinatally lead-exposed rats were analyzed on postnatal days 3, 9, and 15.
  • DNA binding activity to the AP-1 DNA sequence was measured in various brain regions (hippocampus, cortex, frontal lobe, brainstem).

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  • Levels of Jun protein, a component of the AP-1 complex, were assessed.

    • Main Results:

    • A significant increase in AP-1 DNA binding activity was observed on postnatal day 3 in the hippocampus and cortex of lead-treated rats.
    • No significant changes in AP-1 DNA binding were found in the frontal lobe or brainstem, or at later time points (days 9 and 15).
    • Levels of Jun protein did not increase, suggesting post-translational modifications may enhance AP-1 DNA binding.

    Conclusions:

    • Perinatal lead exposure elevates AP-1 DNA binding activity in specific developing brain regions.
    • Lead-induced alterations in AP-1 binding may disrupt the expression of developmentally crucial genes.
    • This mechanism could contribute to the neurological deficits observed following early-life lead exposure.