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1From the Department of Ophthalmology, Tokyo Medical University, Tokyo, Japan; Divisions of 2Molecular Pathology and 5Biochemistry, Aichi Cancer Center Research Institute, Nagoya, Japan; 3Shiroyama Park Dental Clinic, Nagoya, Japan; and 4Department of Neurophysiology, Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan.
PURPOSE. The purpose of this study was to identify target antigens of autoimmune keratitis with a disease-prone mouse model.
METHODS. BALB/c nude mice grafted with embryonic rat thymi (TG nude mice) develop various organ-localized autoimmune lesions, including keratitis. A hybridoma producing a monoclonal antibody (OT-20), specific for corneal epithelium was established by using spleen cells from this model mouse of keratitis, and the target of OT-20 was identified by immunoblot analysis. Then, using the antigen, T-cell proliferation and cytokine production by TG nude mice with keratitis were examined.
RESULTS. Immunoblot analysis revealed
-internexin to be the target antigen of OT-20 that specifically recognizes corneal epithelium. Sera from TG nude mice with keratitis reacted with
-internexin on Western blot analysis, and the T cells of these mice on stimulation with
-internexin exhibited proliferation responses and produced IL-2, IFN-
, and TNF-
, but not IL-4 or IL-5.
CONCLUSIONS. These results suggest that
-internexin is one of the corneal antigens associated with keratitis, developing spontaneously in TG-nude mice, with a probable pathogenic role.
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