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Published on: July 24, 2017
[An immunohistological study of normal parotid gland]
I Makino1, Y Murakami, M Murakami
1Department of Otolaryngology, Kyoto Prefectural University of Medicine.
Insights
Researchers identified a novel "duct satellite cell" in the parotid gland, potentially representing an undifferentiated reserve cell. This cell expresses various cytokeratins, suggesting it may be the origin of all parotid gland epithelial tissues.
Area of Science:
- Salivary Gland Biology
- Epithelial Cell Differentiation
- Immunohistochemistry
Context:
- The parotid gland's complex epithelial structure necessitates understanding its cellular components.
- Previous research has not fully elucidated the origin and characteristics of all parotid gland epithelial cells.
Purpose:
- To investigate the expression patterns of cytoskeletal proteins in different parotid gland epithelial cells.
- To identify and characterize potential progenitor cells within the parotid gland.
Summary:
- Immunohistological analysis revealed distinct cytoskeletal protein expression profiles in acinar, ductal, and myoepithelial cells.
- A novel cell type, termed
- duct satellite cell
- , was identified within the intercalated ducts.
- These duct satellite cells express cytokeratins characteristic of myoepithelial, acinar, and ductal cells, suggesting a progenitor role.
Impact:
- Identifies a potential progenitor cell population in the parotid gland, crucial for understanding gland development and regeneration.
- Provides a foundation for further research into salivary gland stem cells and therapeutic applications.
- Contributes to the broader understanding of epithelial tissue origins and differentiation.
Abstract:
Cytoskeletal proteins from each epithelial component of the parotid gland were studied immunohistologically using monospecific monoclonal antibodies, and we obtained several interesting results: 1) The expression of vimentin, S-100 protein and GFAP were essentially unrecognizable. 2) The expression of alpha-actin was recognized only in myoepithelial cells, and was negative in other tissues. 3) The expression of CK-3, CK-6, CK-7, CK-8 and CK-18 was commonly recognized in both acinal and ductal cells. 4) The expression of CK-13 and CK-19 was recognized in ductal cells, but was negative in acinal cells. 5) We propose that the characteristic cell be referred to as a "duct satellite cell", as it comprises part of the intercalated duct and is sporadically localized around striated and layer ducts. 6) These duct satellite cells express all subclasses of cytokeratin observed in myoepithelial, acinal and ductal cells. 7) The duct satellite cells observed in this study are most likely to correspond to the undifferentiated reserve cells described in "bicellular theory", and we speculate that all epithelial tissues of the parotid gland originate from these cells.
