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Related Experiment Videos

Elevated basal AP-1 DNA binding activity in developing rat brain

K R Pennypacker1, D Dreyer, J S Hong

  • 1Neuropharmacology Section Laboratory of Integrative Biology, National Institute of Environmental Health Sciences, National Institute of Health, Research Triangle Park, NC 27709.

Brain Research. Molecular Brain Research
|September 1, 1993
PubMed
Summary

Early in rat brain development (postnatal day 7), Activator Protein-1 (AP-1) DNA binding activity and c-jun protein levels are high in key brain regions. These levels decrease to adult levels by postnatal day 21, with different protein components than adult AP-1.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Developmental Biology

Background:

  • The transcription factor Activator Protein-1 (AP-1) plays a crucial role in regulating gene expression in the brain.
  • Understanding the developmental changes in AP-1 activity is essential for comprehending neuronal maturation and function.

Purpose of the Study:

  • To investigate the developmental profile of AP-1 DNA binding activity and its protein components in specific rat brain regions during early postnatal development.
  • To compare the molecular composition of the AP-1 complex in the developing brain with that of the adult brain.

Main Methods:

  • Preparation of nuclear extracts from rat hippocampi, striata, and hypothalami at postnatal day 7 (P7) and postnatal day 21 (P21).
  • Assay of AP-1 DNA binding activity using electrophoretic mobility shift assays (EMSA).

Related Experiment Videos

  • Analysis of specific protein components, including c-jun and fos-related antigens, within the AP-1 complex.

    • Main Results:

    • Elevated basal levels of AP-1 DNA binding activity and c-jun protein were detected in P7 rat brain regions (hippocampus, striatum, hypothalamus).
    • These levels significantly decreased to adult basal levels by P21.
    • Fos-related antigens were not a major component of the P7 AP-1 DNA binding activity, unlike in the adult brain.

    Conclusions:

    • AP-1 DNA binding activity and c-jun expression exhibit a distinct developmental trajectory in the rat brain, peaking early postnatally.
    • The molecular composition of the AP-1 complex differs between the developing and adult brain, suggesting developmental stage-specific regulation.
    • These findings highlight the dynamic nature of transcription factor regulation during critical periods of brain development.