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JunB is a repressor of MMP-9 transcription in depolarized rat brain neurons

Marcin Rylski1, Renata Amborska, Katarzyna Zybura

  • 1Department of Molecular and Cellular Neurobiology, Nencki Institute, Pasteura 3, 02-093 Warsaw, Poland. mrylski@nencki.gov.pl

Molecular and Cellular Neurosciences
|November 4, 2008
PubMed

Insights

Matrix Metalloproteinase-9 (MMP-9) gene expression in rat brains is transiently upregulated by neuronal depolarization. JunB acts as a repressor of MMP-9 transcription, revealing a novel regulatory mechanism.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Matrix Metalloproteinase-9 (MMP-9) is an enzyme crucial for synaptic plasticity, memory, and neurodegeneration.
  • Previous research indicates MMP-9 levels rise after seizure-inducing stimuli.

Purpose of the Study:

  • To investigate the transient nature of MMP-9 mRNA expression following neuronal depolarization.
  • To elucidate the role of JunB in the transcriptional regulation of the MMP-9 gene in the hippocampus.

Main Methods:

  • Utilized pentylenetetrazole (PTZ) to induce neuronal depolarization in rat brains.
  • Analyzed MMP-9 mRNA expression and JunB/FosB complex formation at the MMP-9 gene promoter.
  • Manipulated JunB expression levels in activated neurons.

Main Results:

  • MMP-9 mRNA expression was found to be transient in response to PTZ-evoked depolarization.
  • Neuronal activation in the hippocampus induced JunB expression and JunB/FosB complex accumulation on the MMP-9 promoter.
  • Altering JunB levels demonstrated its repressive effect on MMP-9 gene expression.

Conclusions:

  • The study reveals a transient expression pattern for MMP-9 following neuronal depolarization.
  • JunB plays a significant repressive role in regulating MMP-9 transcription via AP-1 binding sites.
  • This identifies a novel mechanism of AP-1-mediated repression in MMP-9 gene regulation.

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