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Expression of galectin-1 in the mouse olfactory system
J Tenne-Brown1, A C Puche, B Key
1Department of Anatomy and Cell Biology, University of Melbourne, Parkville, Vic., Australia.
The International Journal of Developmental Biology
|September 4, 1998
Summary
Galectin-1, a protein crucial for olfactory axon growth, is dynamically expressed by glial cells during embryonic development. This expression pattern, alongside its ligand laminin, supports olfactory nerve pathway formation.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Primary sensory olfactory axons connect the olfactory neuroepithelium to the olfactory bulb.
- Galectin-1 and its ligand laminin are thought to be involved in olfactory axon growth.
- Galectin-1 null mutant mice exhibit defects in olfactory axon targeting.
Purpose of the Study:
- To investigate the spatiotemporal expression pattern of galectin-1 in normal mice.
- To elucidate the role of galectin-1 in the development of the olfactory nerve pathway.
Main Methods:
- Analysis of galectin-1 expression in embryonic mouse olfactory systems at various developmental stages (E15.5 to birth).
- Examination of laminin expression patterns.
- Immunohistochemical analysis of tissue sections.
Main Results:
- Galectin-1 was initially absent from the olfactory neuroepithelium, nerve, and bulb at E15.5.
- Between E16.5 and birth, galectin-1 expression emerged in olfactory nerve ensheathing cells within the lamina propria and nerve fibre layer.
- Neither olfactory sensory neurons nor their axons expressed galectin-1.
- Laminin showed a similar expression pattern to galectin-1.
Conclusions:
- Galectin-1 is dynamically expressed by glial cells during a specific period of olfactory nerve pathway development.
- The coordinated expression of galectin-1 and laminin suggests a role in supporting olfactory axon adhesion and fasciculation.
- These molecules likely facilitate the guidance of axons to their targets in the olfactory bulb.