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Fine structural and histochemical study of equine Paneth cells
K Takehana1, J Masty, M Yamaguchi
1Rakuno Gakuen University, Hokkaido, Japan.
Anatomia, Histologia, Embryologia
|May 20, 1998
Summary
Equine duodenal Paneth cells contain lysozyme and carbohydrates within secretory granules. These cells, uniform in the intestinal glands, show granule variations possibly due to aging.
Area of Science:
- Veterinary Anatomy
- Gastrointestinal Histology
- Cell Biology
Background:
- Paneth cells are specialized epithelial cells found in the small intestine.
- Their primary role involves secreting antimicrobial substances.
- Understanding Paneth cell ultrastructure and function is crucial for equine gastrointestinal health.
Purpose of the Study:
- To investigate the ultrastructure of equine duodenal Paneth cells.
- To concurrently analyze the distribution of lysozyme and glycoconjugates within these cells.
- To explore potential variations in Paneth cell morphology and granule characteristics.
Main Methods:
- Transmission electron microscopy was used to examine Paneth cell ultrastructure.
- Histochemical staining, including periodic acid-thiocarbohydrazide-silver protein-physical development (PA-TCH-SP-PD), identified carbohydrate presence.
- Immunohistochemistry with anti-lysozyme and lectin binding (WGA) localized specific molecules.
Main Results:
- Paneth cells uniformly line the base of equine intestinal glands.
- Secretory granules exhibit central electron densities and peripheral electron-lucent halos.
- The halo layer stained positive for carbohydrates, while the central core reacted with anti-lysozyme.
- Wheat germ agglutinin (WGA) binding indicated the presence of N-acetylglucosamine in the entire granule.
Conclusions:
- Equine duodenal Paneth cells contain both lysozyme and complex carbohydrates within their secretory granules.
- Observed differences between 'young' (Type I) and 'old' (Type II) cells are likely variations of the same cell type, reflecting the aging process of secretory granules.
- This study provides detailed ultrastructural and histochemical insights into equine Paneth cells, contributing to our understanding of equine intestinal immunity.