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Morphologic characterization of conjunctiva-associated lymphoid tissue in chickens
1Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames 50011.
American Journal of Veterinary Research
|November 1, 1991
Summary
Chicken conjunctiva-associated lymphoid tissue (CALT) develops distinct structures, including germinal centers and plasma cells, from posthatching week 1. This lymphoid tissue may play a role in mucosal immunity.
Area of Science:
- Immunology
- Ophthalmology
- Veterinary Science
Background:
- Conjunctiva-associated lymphoid tissue (CALT) is a component of the mucosal immune system.
- Understanding CALT development in avian species is crucial for avian immunology.
Purpose of the Study:
- To characterize the structural development of chicken conjunctiva-associated lymphoid tissue (CALT).
- To investigate the temporal changes in CALT morphology from 1 day to 16 posthatching weeks.
Main Methods:
- Gross, histologic, and electron microscopic examination of chicken eyelids.
- Analysis of CALT structure at multiple time points posthatching.
Main Results:
- CALT, featuring lymphoid nodules with germinal centers and plasma cells, emerged by posthatching week 4.
- Epithelial changes included flattened epithelium with microvilli and intraepithelial lymphocytes.
- Upper eyelid CALT showed smaller, more random nodules compared to the lower eyelid.
- By posthatching week 12, CALT exhibited basal germinal centers, suprafollicular plasma cells, and columnar epithelium.
Conclusions:
- Chicken CALT shares morphological similarities with other mucosal immune tissues.
- CALT in chickens likely contributes to ocular mucosal immunity.