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    J Immunol. 2007 Jan 1;178(1):474-9.

    The net effect of costimulatory blockers is dependent on the subset and activation status of the autoreactive T cells.

    Zhang P, Sun D, Ke Y, Kaplan HJ, Shao H.

    Source

    Department of Ophthalmology and Visual Sciences, Kentucky Lions Eye Center, University of Louisville, Louisville, KY 40202, USA.

    Abstract

    In this study, we investigated whether CD4 and CD8 autoreactive T cells have different costimulatory requirements for their activation in vitro by testing the effect of a panel of Abs specific for various costimulatory molecules. Our results showed that CD8 interphotoreceptor retinoid-binding protein-specific T cells are more dependent on costimulatory molecules for activation than their CD4 counterparts. Interphotoreceptor retinoid-binding protein-specific T cells are less dependent on costimulatory molecules in the secondary response than the primary response. We also showed that blockade of costimulatory molecules can either promote or inhibit the proliferation of autoreactive T cells, depending on the degree of activation of the cells. Our results show that anti-costimulatory molecule treatment can have diverse actions on autoreactive T cell subsets, the net effect being determined by the subset of immune cells affected and the type and dose of treatment used.

    PMID:
    17182586
    [PubMed - indexed for MEDLINE]
    PMCID: PMC2587059
    Free PMC Article

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