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Transplantation. 2001 Dec 15;72(11):1830-5.

MHC-restricted and -unrestricted CD8 T cells: an evolutionary perspective.

Author information

1
Department of Microbiology and Immunology, University of Rochester Medical Center, Rochester, NY 14642, USA.

Abstract

BACKGROUND:

In mammals, cytotoxic CD8 T cells are crucial effectors of a typical adaptive cellular immune response. They recognize and kill cells that express at their surface antigenic peptides complexed to major histocompatibility complex (MHC) class I molecules. Although T cells (undefined as to CD determinants) and associated in vitro cytotoxic activity have been described in a few amphibian and teleost species, their in vivo functions have yet to be characterized.

METHODS AND RESULTS:

CD8 function has been investigated in the frog Xenopus by antibody depletion, skin allografting, and tumor transplantation. Injection of adult frogs with anti-Xenopus CD8 monoclonal antibody effects transient CD8 T-cell depletion in vivo that correlates with delayed rejection of MHC-disparate skin allografts and an impaired immune response against transplanted syngeneic MHC class I-negative tumors.

CONCLUSIONS:

For the first time, CD8 T cells have been shown to be involved in acute skin allograft rejection in an ectothermic vertebrate. Our data also suggest that, at least in Xenopus, T cells that express a CD8 epitope may be effectors in MHC-unrestricted anti-tumor responses.

[Indexed for MEDLINE]

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