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Invest Ophthalmol Vis Sci. 2011 Jul 29;52(8):5920-7. doi: 10.1167/iovs.10-6758.

Activated gammadelta T cells promote the activation of uveitogenic T cells and exacerbate EAU development.

Author information

1
Doheny Eye Institute, Department of Ophthalmology, University of Southern California, Los Angeles, California 90033, USA.

Abstract

PURPOSE:

To determine how the activation of γδ T cells affects the generation of uveitogenic αβ T cells and the development of experimental autoimmune uveitis (EAU).

METHODS:

γδ T cells were isolated from B6 mice immunized with the uveitogenic peptide IRBP(1-20) and αβ T cells from immunized TCR-δ(-/-) mice. Resting γδ T cells were prepared by culture of separated γδ T cells in cytokine-free medium for 3 to 5 days, when they showed downregulation of CD69 expression. Activated γδ T cells were prepared by incubating resting γδ T cells with anti-γδ TCR (GL3) for 2 days. Responder αβ T cells were cocultured with immunizing antigen and antigen-presenting cells. The numbers of antigen-specific T cells expressing IL-17 or IFN-γ were determined by intracellular staining followed by FACS analysis after stimulation, with or without the addition of purified γδ T cells. The cytokines in the culture medium were measured by ELISA.

RESULTS:

Highly enriched γδ T cells exert widely different effects on autoreactive αβ T cells in EAU, depending on the activation status of the γδ T cells. Whereas nonactivated γδ T cells had little effect on the activation of interphotoreceptor retinoid-binding protein-specific αβ T cells in vitro and in vivo, activated γδ T cells promoted the generation of uveitogenic T cells and exacerbated the development of EAU.

CONCLUSIONS:

The functional ability of γδ T cells is greatly influenced by their activation status. Activated γδ T cells exacerbate EAU through increased activation of uveitogenic T cells.

PMID:
21296823
PMCID:
PMC3262554
DOI:
10.1167/iovs.10-6758
[Indexed for MEDLINE]
Free PMC Article
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