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Astrocyte-Derived Small Extracellular Vesicles Regulate Dendritic Complexity through miR-26a-5p Activity.

Alejandro Luarte1,2, Roberto Henzi1, Anllely Fernández1

  • 1Centro de Investigación e Innovación Biomédica (CIIB), Facultad de Medicina, Universidad de los Andes, Santiago 7550000, Chile.

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|April 16, 2020
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Summary

Astrocyte-derived small extracellular vesicles (sEVs) carrying Aldolase C (Aldo C) influence neuron development. These sEVs, enriched with miRNA-26a-5p, reduce neuronal complexity, revealing astrocyte-to-neuron communication pathways.

Keywords:
astrocytesdendritic complexityexosomeshippocampal neuronsmicroRNAs

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Extracellular Vesicles Research

Background:

  • Astrocytes are crucial for regulating neuronal morphology.
  • The role of astrocyte-derived small extracellular vesicles (sEVs) in neuronal differentiation is an emerging area of research.

Purpose of the Study:

  • To investigate the impact of astrocyte-derived sEVs, specifically those containing Aldolase C (Aldo C-GFP), on the morphological differentiation of hippocampal neurons.
  • To elucidate the molecular mechanisms, particularly the role of miRNA-26a-5p, underlying this astrocyte-to-neuron communication.

Main Methods:

  • Primary astrocyte and hippocampal neuron cultures.
  • Generation and characterization of GFP-tagged Aldolase C (Aldo C-GFP) in astrocytes.
  • Isolation and transfer of astrocyte-derived sEVs to neurons.
  • Bioinformatic and biochemical analyses of sEV and astrocyte content.
  • Manipulation of miRNA-26a-5p levels in neurons using mimics and antagonists.
  • Assessment of neuronal morphology and protein expression.

Main Results:

  • Astrocytes overexpressing Aldo C-GFP released sEVs that reduced dendritic complexity in developing hippocampal neurons.
  • Aldo C-GFP overexpression in astrocytes correlated with increased miRNA-26a-5p levels in both astrocytes and their released sEVs.
  • Neuronal treatment with miRNA-26a-5p mimics replicated the morphological changes induced by Aldo C-GFP sEVs.
  • Neuronal treatment with miRNA-26a-5p antagonists conferred resistance to the effects of Aldo C-GFP sEVs.

Conclusions:

  • Astrocyte-derived sEVs mediate a novel form of communication with neurons.
  • The miRNA content of astrocyte-derived sEVs, specifically miRNA-26a-5p, plays a critical role in regulating neuronal morphology.
  • Overexpression of astrocytic enzymes like Aldo C can alter the miRNA cargo of sEVs, impacting neuronal development.