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Soluble factors from the olfactory bulb attract olfactory Schwann cells


Liu, KL and Chuah, MI and Lee, KKH, Soluble factors from the olfactory bulb attract olfactory Schwann cells, Journal of Neuroscience, 15, (2) pp. 990-1000. ISSN 0270-6474 (1995) [Refereed Article]

DOI: doi:10.1523/jneurosci.15-02-00990.1995


Olfactory Schwann cells (OSCs) extend processes that ensheathe bundles of olfactory axons as they course from the olfactory epithelium to the olfactory bulb (OB). Results of morphological and immunohistochemical studies have led to speculation that OSCs may be involved in guiding the olfactory axons to their target tissue. In this study we have explored this possibility by investigating the relationship between OSCs and the OB. Olfactory Schwann cells labelled with 1,1'-dioctadecyl 3,3,3',3'-tetramethylindocarbocyanine perchlorate (Dil) were injected into the nasal region of E14 rat embryos and entire embryos were cultured for 24 hr. It was found in some embryos, that the OSCs had migrated toward the presumptive OB. Cocultures of neonatal OB explants on OSC monolayers showed that the OSCs were attracted to the OB and formed a ring-like aggregate around the explant after 48 hr culture. This attraction was absent when a piece of cerebrum was used in place of the OB. When medium conditioned by neonatal OBs was placed in the lower compartment of the chemotaxis chamber, OSCs seeded in the upper compartment migrated through the pores of the nucleopore filter to reach the underside which was in contact with the conditioned medium. After 6 hr of incubation, scanning electron microscopy was performed on the underside of the nucleopore filters. Cell counts of OSCs showed that the cell density was significantly higher when medium conditioned by OBs was used instead of unconditioned medium or medium conditioned by cerebrum. The results of these experiments show that the OSCs migrate toward the OB under the influence of soluble factor(s) secreted by the target tissue.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal neurobiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Chuah, MI (Associate Professor Inn Chuah)
ID Code:5050
Year Published:1995
Web of Science® Times Cited:45
Deposited By:Anatomy and Physiology
Deposited On:1995-08-01
Last Modified:2011-08-24

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