Evidence for a compartmentalized B cell response as characterized by IgG epitope specificity in human ocular toxoplasmosis.
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| Abstract |
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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| Authors | V N Klaren, R Peek |
| Journal | Journal of immunology (Baltimore, Md. : 1950) (J Immunol) Vol. 167 Issue 11 Pg. 6263-9 (Dec 01 2001) ISSN: 0022-1767 [Print] United States |
| PMID | 11714789 (Publication Type: Journal Article) |
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