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Uveitopathogenic sites in bovine S-antigen
V K Singh1, L A Donoso, K Yamaki
1Laboratory of Immunology, NEI, NIH, Bethesda, MD 20892.
Autoimmunity
|January 1, 1989
Summary
This study investigated bovine S-antigen peptides in guinea pigs, finding that specific peptides induce experimental autoimmune uveitis (EAU) and pinealitis (EAP). These findings suggest S-antigen has multiple sites capable of causing disease.
Area of Science:
- Ophthalmology
- Immunology
- Neuroscience
Background:
- Experimental autoimmune uveitis (EAU) is an autoimmune condition affecting the eye.
- Bovine S-antigen is a known immunogen implicated in the pathogenesis of EAU.
- The specific pathogenic sites within S-antigen are not fully elucidated.
Purpose of the Study:
- To investigate the immunopathogenic potential of four synthetic peptides derived from bovine S-antigen.
- To characterize the inflammatory responses, including uveitis and pinealitis, induced by these peptides.
- To assess the in vitro cellular immune response to the S-antigen peptides.
Main Methods:
- Hartley guinea pigs were immunized with high doses (200 micrograms) of four synthetic peptides (peptide 3, K, N, M) corresponding to specific amino acid positions of bovine S-antigen.
- Histopathological examination was performed to evaluate inflammatory responses in the uveal tract, retina, and pineal gland.
- Lymph node cells were stimulated in vitro with the respective peptides, and proliferation was measured by [3H] thymidine uptake.
Main Results:
- Immunization with peptides N and M induced a moderate inflammatory response in the uveal tract and retina, while peptides 3 and K caused a mild response.
- A significant incidence of associated pinealitis (EAP), characterized by lymphocytic infiltration of the pineal gland, was observed in animals with EAU.
- Lymph node cells from immunized guinea pigs exhibited strong in vitro proliferative responses to their respective immunizing peptides.
Conclusions:
- Bovine S-antigen contains multiple sites that can induce experimental autoimmune uveitis and associated pinealitis in susceptible individuals.
- The synthetic peptides tested elicited distinct inflammatory profiles, highlighting the complexity of S-antigen-mediated autoimmunity.
- These findings contribute to understanding the pathogenesis of EAU and may have implications for autoimmune diseases involving the eye and pineal gland.