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Lipid droplet accumulation in the exocrine glands of the newborn rat
1Department of Oral and Maxillofacial Surgery, Ehime University, School of Medicine, Japan.
Insights
Lipid droplets accumulate in newborn rat exocrine glands, particularly after suckling. Accumulation peaks within 48 hours post-birth, varying by gland type.
Area of Science:
- Developmental Biology
- Cell Biology
- Histology
Background:
- Exocrine glands play vital roles in secretion and development.
- Understanding early postnatal gland development is crucial for identifying potential physiological disruptions.
- Lipid droplet dynamics in developing exocrine tissues are not fully elucidated.
Purpose of the Study:
- To investigate the morphological changes and lipid droplet accumulation in key exocrine glands of newborn rats.
- To determine the temporal patterns and gland-specific variations in lipid droplet formation during early postnatal life.
- To explore the influence of suckling on lipid droplet accumulation in these glands.
Main Methods:
- Morphological examination of submandibular gland, sublingual gland, exocrine pancreas, and exorbital lacrimal gland in newborn rats (0-14 days).
- Analysis of lipid droplet localization within secretory cells, particularly basal cytoplasm.
- Comparison of lipid droplet accumulation across different exocrine gland types and between suckled and non-suckled neonates.
Main Results:
- Lipid droplets were primarily observed in the basal cytoplasm of secretory cells.
- Significant lipid droplet accumulation occurred in the sublingual gland, submandibular gland, and exocrine pancreas.
- The exorbital lacrimal gland showed minimal lipid droplet accumulation.
- Accumulation peaked 24-48 hours post-birth in most studied glands.
- No lipid droplets were observed in glands of non-suckled newborn rats.
Conclusions:
- Suckling is a critical factor for lipid droplet accumulation in the developing exocrine glands of newborn rats.
- Gland-specific differences in lipid droplet accumulation suggest distinct physiological roles or developmental trajectories.
- The findings highlight the importance of early nutrition and maternal care for exocrine gland development.
Abstract:
Exocrine glands including the submandibular gland, sublingual gland, exocrine pancreas and exorbital lacrimal gland of newborn rats aged 0 to 14 days were examined morphologically, and the following results on the accumulation of lipid droplets were obtained. Lipid droplets tended to localize in secretory cells, especially in their basal cytoplasm. The degree of lipid droplet accumulation varied with the type of exocrine gland. There were large accumulations in the sublingual gland, submandibular gland, and exocrine pancreas, but accumulations were small in the exorbital lacrimal gland. No difference in lipid droplet accumulation was recognized between the 2 types of secretory cells in the sublingual gland. The accumulation of lipid droplets peaked 24-48 hours after birth in the sublingual gland, submandibular gland and exocrine pancreas, but this peak was not clearly observed in the exorbital lacrimal gland. In the group of newborn rats separated from their mothers and therefore not suckled, no lipid droplets were observed in any gland, suggesting a close relationship between lipid droplet accumulation and suckling.