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Microsc Res Tech. 1994 Oct 15;29(3):231-9.

Subcellular localization and quantitative analysis of Toxoplasma gondii target antigens of specific immunoglobulins G, M, A, and E.

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Unité INSERM U. 314 et Laboratoire de Parasitologie, CHU Maison Blanche, Reims.


The target antigens of specific immunoglobulins G, M, A, and E from patients with acquired acute toxoplasmosis were determined using immunocytochemistry. The relative repartition of these antigens in four cellular compartments of Toxoplasma (membrane complex, apical area, rhoptries, and dense granules) was quantitatively evaluated. Rhoptry antigens mainly react positively with IgA. Membrane, submembrane area (membrane complex), and rhoptry antigens are immunodominant for IgA and IgM. Apical area antigens are recognized by IgM two times more than IgG and IgA. IgE recognized only rhoptry antigens. The localization of pathogenetically antigenic components and their identification by the immune system appeared to be of importance for selection of immunodominant or recombinant antigens. Such localization would improve laboratory diagnosis of serious congenital toxoplasmosis or in immunocompromised patients with toxoplasmic complications after cyst reactivation.

[Indexed for MEDLINE]

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