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Related Experiment Videos

Role of galectin-1 in the developing mouse olfactory system

A C Puche1, F Poirier, M Hair

  • 1Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Victoria, Australia.

Developmental Biology
|October 10, 1996
PubMed
Summary

Galectin-1 promotes neurite outgrowth in olfactory neurons in vitro. In vivo, galectin-1 is crucial for the correct pathfinding and topographical organization of olfactory sensory axons in the developing mammalian nervous system.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • Primary sensory olfactory neurons form a topographic map in the olfactory bulb.
  • Galectin-1, a lectin, is present in the developing rodent olfactory system.

Purpose of the Study:

  • To investigate the role of galectin-1 in neurite outgrowth and neuronal pathfinding in the olfactory system.

Main Methods:

  • Utilized the mouse olfactory neuron cell line 4.4.2 for in vitro neurite outgrowth assays.
  • Examined olfactory axon topography in galectin-1 null mutant mice using Dolichos biflorus agglutinin staining.

Main Results:

  • Recombinant galectin-1 promoted neurite outgrowth of olfactory neurons in vitro, an effect blocked by lactose.

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  • Aberrant olfactory axon topography was observed in galectin-1 null mutant mice, with some axons failing to reach their correct targets.

    • Conclusions:

    • Galectin-1 modulates olfactory neuron growth and guidance, playing a critical role in establishing correct neuronal connections in the mammalian olfactory system.
    • This study is the first to show lectin-mediated neurite outgrowth and neuronal pathfinding in the mammalian nervous system.