| Histologic Study on the Development of Olfactory Mucosa in Rats |
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Joong Keun Kwon, Hun Jong Dhong, Hyun Joon Lim |
1Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Ulsan University, Ulsan, Korea.
2Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Sungkyunkwan University, Samsung Medical Center, Seoul, Korea. hjdhong@smc.samsung.co.kr
3Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Hallym University, Seoul, Korea. |
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| Abstract |
Background and Objectives
There is evidence which suggests that mammals have functional olfactory systems at birth or shortly before birth. This study was performed to investigate perinatal development of the olfactory mucosa.
MATERIALS AND METHODS
Sprague-Dawley rats at the 19th gestational day, and of the 1st, 3rd, 7th, 14th, 21st, and 28th postnatal day were sacrificed. The light microscopic investigation of the olfactory mucosa was conducted with hematoxylineosin stain, immunohistochemical stain for proliferating cell nuclear antigen (PCNA) and protein gene product (PGP) 9.5.
Results
Number of the cell layers, epithelial thickness, and density of the olfactory receptor cell peaked at the postnatal 14th day. The cells of the basal layer changed from globose cells to basal cell proper with age. The number of the basal cells to the receptor cells decreased with age. PCNA was positive both in the supporting and basal layers. PCNA positivity decreased with age in the supporting layer but stayed stationary in the basal layer. PGP 9.5 was strongly positive in the olfactory receptor cells, dendrites, and the nerve bundles but negative in the supporting and basal layers.
Conclusion
The olfactory epithelium proliferated maximally at postnatal 14 day, and afterwards the olfactory mucosa tended to show their characteristic maturation with slowed neurogenesis. |
| Key Words:
Olfactory epithelium;Proliferating cell nuclear antigen;Protein gene product 9.5 |
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