Toxoplasma gondii antigens GRA1 (p24) and SAG1 (p30): A comparison of their stimulatory influence on T-cell activation and cytokine expression in in vitro cultures

College

College of Science

Department/Unit

Biology

Document Type

Article

Source Title

Pathobiology

Volume

72

Issue

3

First Page

160

Last Page

164

Publication Date

4-1-2005

Abstract

The influence of recombinant cell surface SAG1 (rp30) and secretory GRA1 (rp24) antigens (Ag) on T-cell activation and cytokine induction in vitro was compared. T-cell activity and the level of IFN-γ, IL-10 and IL-12 expression in rp30-immunized T cells were considerably increased in the presence of rp30 Ags. IgG2a and IgG1 antibodies (Ab) were detected in sera of rp24- and rp30-immunized mice, with the secretory rp24 Ag having induced significantly higher titer of IgG1 Ab. In vitro, the greater antigenicity of surface rp30 Ag was notable based on the level of T-cell activation, and cytokine synthesis suggestive of the participation of Th1 cells. Although, IFN-γ expression by rp24 Ag was lower compared to rp30 Ag, the synthesis of both IgG2a and IgG1 Abs reflects the protective nature of rp24 Ag. We have generated two recombinant Toxoplasma gondii Ags that demonstrated differences in antigenicity in vitro. It would be interesting to evaluate the mechanism(s) of immunity induced by SAG1 (p30) and GRA1 (p24) Ags against infection with T. gondii in vivo. Copyright © 2005 S. Karger AG.

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Digitial Object Identifier (DOI)

10.1159/000084120

Disciplines

Biology

Keywords

Toxoplasma gondii; Antigens; T cells; Cytokines

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