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Published on: January 24, 2015
Glycoconjugates in the otolithic organ of the developing chick embryo
S Endo1, T Sekitani, H Yamashita
1Department of Otolaryngology, Yamaguchi University School of Medicine, Ube, Japan.
Insights
Glycoconjugates are crucial for otoconia formation in developing chick embryos. Lectin histochemistry revealed their presence in the sensory epithelium and otoconia, indicating secretion by supporting cells.
Area of Science:
- Developmental Biology
- Histochemistry
- Otolithic Organ Development
Background:
- The otolithic organs are essential for balance and hearing.
- The composition and formation of otoconia are not fully understood.
- Glycoconjugates are complex carbohydrates with diverse biological roles.
Purpose of the Study:
- To investigate the presence and role of glycoconjugates in the developing chick embryo otolithic organ.
- To identify the cellular origin of otoconial precursors.
Main Methods:
- Histochemical staining using various lectins.
- Transmission Electron Microscopy (TEM) for ultrastructural analysis.
- Observation across multiple developmental stages of chick embryos.
Main Results:
- Intense lectin labeling was observed in the sensory epithelium and on immature otoconia at 6 days.
- Otoconia showed consistent lectin labeling throughout development.
- Lectin binding was stronger in the electron-dense zones of otoconia.
- Secretory granules within supporting cells of the sensory epithelium were lectin-positive.
Conclusions:
- Glycoconjugates are secreted by supporting cells of the sensory epithelium.
- These glycoconjugates serve as precursors for otoconial formation.
- Glycoconjugates play a significant role in the biogenesis of otoconia.
Abstract:
The presence of glycoconjugates in the otolithic organ of developing chick embryos was investigated histochemically using lectins. On the 6-day-old chick embryo, intense labelling with lectins was observed in the sensory epithelium, on the surface of the epithelium and on the immature otoconia. The otoconia were intensely labelled with lectins at every stage of the chick embryos, while the labelling with lectins in the sensory epithelium became weaker with the maturing of the otoconia. In TEM observation, the secretory granules of the supporting cells of the sensory epithelium were labelled with lectin. The reaction of lectin was more intense in the electronic dense zone of the otoconium than in the electronic lucent zone at every stage of the chick embryos. These findings indicate that the precursors of the otoconia are secreted by the supporting cells of the sensory epithelium and that glycoconjugates play an important role in otoconial formation.
