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Expression and localization of FGF-1 in the developing rat olfactory system
B Key1, H B Treloar, L Wangerek
1Department of Anatomy and Cell Biology, University of Melbourne, Parkville, VIC, Australia. bkey@anatomy.unimelb.edu.au
The Journal of Comparative Neurology
|March 4, 1996
Summary
Fibroblast growth factor-1 (FGF-1) is expressed in the developing olfactory system and supports the growth of olfactory neurons. This molecule is crucial for the formation of the olfactory pathway.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Primary olfactory axons connect the nasal neuroepithelium to the olfactory bulb, synapsing with mitral cells.
- Olfactory nerve ensheathing cells (ONCs) surround olfactory axons and are thought to regulate their growth.
- Fibroblast growth factor-1 (FGF-1) is a heparin-binding growth factor implicated in neural development.
Purpose of the Study:
- To investigate the role of FGF-1 in the development of the olfactory pathway.
- To determine the expression pattern and functional significance of FGF-1 in the olfactory system.
Main Methods:
- Immunohistochemical analysis to detect FGF-1 expression in the olfactory bulb and neuroepithelium.
- In vitro cell culture experiments using olfactory neuroepithelial cells.
- Assessment of morphological differentiation in response to FGF-1 stimulation.
Main Results:
- FGF-1 is expressed by ONCs surrounding olfactory axons and later by mitral cells in the olfactory bulb.
- Postnatal FGF-1 is localized to glomeruli and the external plexiform layer.
- FGF-1, complexed with heparan sulfate proteoglycans, promotes the differentiation of ONCs and olfactory sensory neurons in vitro.
Conclusions:
- The spatiotemporal expression of FGF-1 suggests its involvement in olfactory pathway formation.
- FGF-1 plays a significant regulatory role in modulating olfactory axon growth and neuronal differentiation.
- This study highlights FGF-1 as a key molecule in the development of the olfactory system.