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Experimental immune-mediated blepharoconjunctivitis in rats induced by immunization with ragweed pollen
H Iwamoto1, K Nishino, T M Magone
1Department of Ophthalmology, Kochi Medical School, Nankoku, Japan.
Summary
This study compared ragweed pollen (RW) immunization effects in Lewis and Brown Norway (BN) rats using different adjuvants to understand experimental immune-mediated blepharoconjunctivitis (EC). Rat strain genetic background significantly influences EC characteristics and immune responses to RW.
Area of Science:
- Immunology
- Ophthalmology
- Allergy Research
Background:
- Experimental immune-mediated blepharoconjunctivitis (EC) is a model for eye inflammation.
- Ragweed pollen (RW) is a common allergen.
- Adjuvants modulate immune responses to antigens.
Purpose of the Study:
- To compare the effects of RW immunization in two adjuvants on EC in rats.
- To investigate the influence of rat strain genetic background on immune responses.
Main Methods:
- Lewis and Brown Norway (BN) rats were immunized with RW in aluminum hydroxide [Al(OH)3] or complete Freund's adjuvant (CFA).
- Animals were challenged topically with RW, and eyes, blood, and lymph nodes were analyzed.
- Immune responses including histology, antibody levels, and cytokine production were measured.
Main Results:
- RW induced mononuclear cell infiltration in Lewis rats and eosinophils in BN rats.
- Lymphocyte proliferation varied by rat strain and adjuvant used.
- RW-specific IgE was detected only in BN rats, while Lewis rats showed higher interferon-gamma levels.
Conclusions:
- The genetic background of Lewis and BN rats significantly impacts the characteristics of EC.
- Immune responses to ragweed pollen (RW) are strain-dependent and adjuvant-sensitive.