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The Journal of Immunology, 2001, 167: 6263-6269.
Copyright © 2001 by The American Association of Immunologists

Evidence for a Compartmentalized B Cell Response as Characterized by IgG Epitope Specificity in Human Ocular Toxoplasmosis

Vincent N. A. Klaren1 and Ron Peek

Department of Molecular Immunology, The Netherlands Ophthalmic Research Institute, Amsterdam, The Netherlands

Infectious agents in the eye induce both a local and a systemic humoral immune response. Previously, differences in Ag recognition were observed between systemic and ocular derived IgG of patients with ocular toxoplasmosis. This finding implied a nonrandom distribution of IgG-producing B cells in the inflamed eye. In the present study, we compared the intraocular and systemic B cell responses of patients with ocular toxoplasmosis to a single Toxoplasma gondii Ag. Two series of C-terminally deleted recombinant T. gondii GRA-2 proteins were constructed to delineate IgG B cell epitopes of paired ocular and serum samples. Differences in epitope region recognition between the ocular and systemic compartment were detected in 9 of 13 patients. The difference in distribution of GRA-2 epitopes between paired samples is indicative of a local GRA-2 specific B cell population functionally different from the systemic GRA-2-specific B cell population. Our results suggest a selective activation of a subset of B cells locally in nonlymphoid tissue.




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