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A neuroprotective role for microRNA miR-1000 mediated by limiting glutamate excitotoxicity

Pushpa Verma1, George J Augustine2, Mohamed-Raafet Ammar3

  • 11] Institute of Molecular and Cell Biology, Singapore. [2] Department of Biological Sciences, National University of Singapore, Singapore.

Nature Neuroscience
|February 3, 2015
PubMed

Insights

MicroRNAs regulate synaptic signaling. Drosophila miR-1000 presynaptically controls glutamate release via vesicular glutamate transporter (VGlut), protecting against excitotoxicity in flies and mice.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are emerging as key regulators of synaptic signaling.
  • Their role in controlling postsynaptic responsiveness during synaptic transmission is increasingly recognized.

Purpose of the Study:

  • To investigate the presynaptic role of Drosophila miR-1000 in regulating glutamate release.
  • To explore the function of conserved miRNAs in neuroprotection across species.

Main Methods:

  • Genetic deletion of miR-1000 in Drosophila melanogaster.
  • Analysis of vesicular glutamate transporter (VGlut) expression.
  • Investigation of miR-137's role in mouse neurons.
  • Assessment of apoptosis and excitotoxicity.

Main Results:

  • Genetic deletion of miR-1000 resulted in elevated brain apoptosis due to glutamatergic excitotoxicity.
  • miR-1000 acts presynaptically to control VGlut expression and glutamate release.
  • Seed-similar miR-137 regulates VGluT2 expression in mouse neurons.
  • Conserved miRNAs (miR-1000 and miR-137) demonstrate neuroprotective functions in both flies and mice.

Conclusions:

  • Drosophila miR-1000 plays a critical role in presynaptic regulation of glutamate release.
  • Conserved miRNAs offer neuroprotection against excitotoxicity in invertebrates and vertebrates.
  • Activity-dependent expression of miR-1000 may fine-tune excitatory synaptic transmission strength.

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