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Preparation of Acute Subventricular Zone Slices for Calcium Imaging
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Galectin-3 modulates postnatal subventricular zone gliogenesis.

Osama Al-Dalahmah1,2, Luana Campos Soares1,3, James Nicholson1

  • 1Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK.

Glia
|October 19, 2019
PubMed
Summary

Galectin-3 (Gal-3) is crucial for generating brain glia, like astrocytes, in mice. Increased Gal-3 promotes astrocyte production via bone morphogenetic protein signaling, independent of inflammation.

Keywords:
electroporationgalectin-3gliogenesissubventricular zone

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Postnatal subventricular zone (SVZ) neural stem cells are key for forebrain glia development.
  • The molecular cues regulating this critical gliogenesis phase remain largely unknown.
  • Galectin-3 (Gal-3) is implicated in brain pathologies and astrocyte regulation.

Purpose of the Study:

  • To investigate the inflammation-independent role of Gal-3 in postnatal forebrain gliogenesis.
  • To elucidate the molecular mechanisms by which Gal-3 influences astrocyte and oligodendrocyte generation.
  • To assess the relevance of Gal-3 in human perinatal brain injury models.

Main Methods:

  • Functional studies in mice, including Gal-3 overexpression and knockdown/knockout.
  • Immunohistochemistry to assess inflammation and cell types.
  • Analysis of Gal-3 binding to bone morphogenetic protein receptor 1 alpha (BMPR1α) and BMP signaling.
  • Examination of human perinatal brain tissue post-hypoxia/ischemia.

Main Results:

  • Gal-3 loss reduced gliogenesis; Gal-3 overexpression increased it, without inducing inflammation in healthy SVZ.
  • Gal-3 overexpression enhanced striatal astrocyte production while reducing oligodendrocyte generation.
  • Gal-3 directly binds BMPR1α, activating BMP signaling, which is essential for Gal-3's gliogenic effects.
  • Increased Gal-3 immunoreactivity was observed in human SVZ and striatum following perinatal hypoxia/ischemia.

Conclusions:

  • Gal-3 plays a novel, inflammation-independent role in promoting gliogenesis, particularly astrogenesis.
  • Gal-3 acts via the BMP signaling pathway by interacting with BMPR1α.
  • These findings highlight Gal-3's significance in normal brain development and its potential role in pathological conditions like perinatal hypoxic/ischemic injury.