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Published on: April 24, 2016
Developmental distribution of microperoxisomes in the rat submandibular gland
Abstract:
The present study investigated the size, number, and distribution of microperoxisomes (MP) during the prenatal and postnatal development of the rat submandibular gland (SMG). A three-fold increase in MP number per cell was observed in the cells of the rudiment from the 15th to the 16th day of gestation. The early secretory and striated duct cells contained about 9.0 MP. The number of MP per secretory cell decreased such that 3.5 MP were found in each mature acinar cell. In the striated duct cells, MP number progressively increased to 40.0. As the convoluted granular tubule cells (CGT) developed from striated duct cells there was an increase in MP number from 16.0 to 26.0/cell. At maturity, the convoluted granular tubule cells contained only 14.0 MP. Throughout development of the SMG, intercalated duct cells showed only rare MP. The data suggests that the number, size, and distribution of MP changes as a function of the particular path of differentiation followed by the various cells in the rat SMG.
Insights
Microperoxisomes (MP) in rat submandibular glands change in number and distribution during development. These changes correlate with specific cell differentiation pathways in the developing gland.
Area of Science:
- Cell Biology
- Developmental Biology
- Histology
Background:
- Microperoxisomes (MP) are small organelles involved in various metabolic processes.
- The submandibular gland (SMG) is a complex salivary gland with diverse cell types.
- Understanding organelle dynamics during development is crucial for comprehending tissue maturation.
Purpose of the Study:
- To investigate the quantitative changes in microperoxisomes (MP) during prenatal and postnatal development of the rat submandibular gland (SMG).
- To analyze the distribution and number of MP in different cell types of the developing SMG.
- To correlate MP variations with specific cellular differentiation pathways.
Main Methods:
- Stereological analysis of microperoxisomes in rat SMG tissue.
- Microscopic examination of prenatal and postnatal SMG development.
- Quantitative assessment of MP number, size, and distribution per cell.
Main Results:
- A three-fold increase in MP number per cell was observed in rudiment cells between gestational days 15 and 16.
- Early secretory and striated duct cells initially contained approximately 9.0 MP.
- Mature acinar cells showed a decrease to 3.5 MP, while striated duct cells increased to 40.0 MP. Convoluted granular tubule (CGT) cells exhibited dynamic MP changes during differentiation.
- Intercalated duct cells consistently showed rare MP throughout development.
Conclusions:
- The number, size, and distribution of microperoxisomes (MP) are dynamic and vary significantly during SMG development.
- MP content changes are closely associated with the specific differentiation trajectory of individual cell types within the rat SMG.
- This study highlights the adaptive role of MP in cellular specialization during gland morphogenesis.
