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Beta B1-Crystallin: Identification of a Candidate Ciliary Body Uveitis Antigen

¹From the Departments of Ophthalmology, ⁴Physiologic Science, and ⁵Pathology and Laboratory Medicine, University of California, Los Angeles, California; the ³Department of Oral Molecular Biology, Oregon Health Sciences University, Portland, Oregon; and the ⁶Department of Surgery, West Los Angeles Veterans Affairs Medical Center, Los Angeles, California.

PURPOSE. Perineuclear anti-neutrophil cytoplasmic antibody (pANCA), a marker antibody present in 12% of patients with anterior uveitis, recognizes cytoplasmic antigens in the nonpigmented ciliary body epithelium, a probable site of immunologic reactivity in this inflammatory disease. In this study, a recombinantly isolated pANCA monoclonal antibody was used to identify the corresponding antigenic target(s) in the ciliary body.

METHODS. Proteins from microdissected eye bank ocular ciliary body tissue were used to identify the corresponding ANCA antigen. Parallel two-dimensional protein gels were used for simultaneous identification of candidate antigenic protein spots by Western blot analysis and as a source of material for proteomic analysis. Multiple independent methods including Western blot analysis, confocal microscopy, and RT-PCR were used to provide additional characterization of the candidate protein.

RESULTS. Proteomic analysis suggested that beta B1 (ßB1)-crystallin is the primary ciliary body antigen. The presence of ßB1-crystallin in the human ciliary body was confirmed by Western blot with a ßB1 specific anti-peptide antibody. Confocal microscopy revealed colocalization of the antigenic reactivity of both anti-ßB1 antibody and monoclonal pANCA. RT-PCR confirmed the presence of ßB1-crystallin RNA in the ciliary body tissues.

CONCLUSIONS. This study identified ßB1-crystallin as a new cytoplasmic ciliary body antigenic target of a marker autoantibody associated with uveitis. This characterization of ßB1-crystallin outside the lens raises questions about its extralenticular expression, intracellular role, and potential target of inflammation in uveitis.

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