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The Journal of Immunology, Vol 148, Issue 1 13-18, Copyright © 1992 by American Association of Immunologists
ARTICLES |
EP Grant and KL Rock
Dana-Farber Cancer Institute, Division of Lymphocyte Biology, Boston, MA 02115.
We have used a T-T hybridoma, RF33.70, to detect the MHC class I- restricted presentation of exogenous native OVA by thymic APC in vitro. Presentation of OVA with class I molecules by thymic APC requires intracellular processing. Phenotypic analyses indicated that low bouyant density, MHC class II+, FcR+ cells are capable of using this presentation pathway. In order to determine whether thymic APC have this function in vivo, thymic APC were isolated from mice after i.v. injection of native OVA. We find that OVA is presented in association with MHC class I, but not class II, molecules in the thymus. This is in contrast to splenic APC, which present exogenous OVA with both class I and class II molecules under these conditions. Our findings have implications for the repertoire of self-peptides that might be presented by thymic APC to developing T lymphocytes.
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