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Developmental changes in conjunctiva-associated lymphoid tissue of the rabbit
Charlette Cain1, Thomas E Phillips
1Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211-7400, USA.
Investigative Ophthalmology & Visual Science
|February 1, 2008
Summary
Conjunctiva-associated lymphoid tissue (CALT) in rabbits changes with age, mirroring human patterns. Immune function may be reduced in young and elderly rabbits due to lower CALT levels.
Area of Science:
- Immunology
- Ophthalmology
- Developmental Biology
Background:
- Organized conjunctiva-associated lymphoid tissue (O-CALT) is crucial for ocular mucosal immunity.
- It is continuously exposed to environmental antigens, playing a key role in the common mucosal immune system.
Purpose of the Study:
- To investigate age-related changes in rabbit O-CALT.
- To compare these changes with those observed in human conjunctiva.
Main Methods:
- Fluorescence stereomicroscopy to quantify conjunctival follicles in rabbits of various ages (2 days to 57 months).
- Confocal microscopy to assess M-cell function via latex bead transcytosis.
Main Results:
- O-CALT emerged post-birth (around day 11) and increased until adolescence, stabilizing in adulthood.
- A significant decline in follicle number and size was observed in aged rabbits, particularly in the superior conjunctiva.
- M-cell function remained consistent across all age groups.
Conclusions:
- Age-related changes in rabbit O-CALT resemble those in humans.
- Aging does not affect M-cell presence or function.
- Reduced O-CALT in young and elderly rabbits may compromise ocular mucosal immune responses.
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