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The Journal of Immunology, 2000, 164: 191-200.
Copyright © 2000 by The American Association of Immunologists

Characterization of CD8+ T Lymphocytes That Persist After Peripheral Tolerance to a Self Antigen Expressed in the Pancreas1

C. Thomas Nugent{dagger}, David J. Morgan{dagger}, Judith A. Biggs{dagger}, Alice Ko{dagger}, Ingrid M. Pilip*, Eric G. Pamer* and Linda A. Sherman2,{dagger}

* Sections of Infectious Diseases and Immunobiology, Yale University School of Medicine, New Haven, CT 06520; and {dagger} Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037

As a result of expression of the influenza hemagglutinin (HA) in the pancreatic islets, the repertoire of HA-specific CD8+ T lymphocytes in InsHA transgenic mice (D2 mice expressing the HA transgene under control of the rat insulin promoter) is comprised of cells that are less responsive to cognate Ag than are HA-specific CD8+ T lymphocytes from conventional mice. Previous studies of tolerance induction involving TCR transgenic T lymphocytes suggested that a variety of different mechanisms can reduce avidity for Ag, including altered cell surface expression of molecules involved in Ag recognition and a deficiency in signaling through the TCR complex. To determine which, if any, of these mechanisms pertain to CD8+ T lymphocytes within a conventional repertoire, HA-specific CD8+ T lymphocytes from B10.D2 mice and B10.D2 InsHA transgenic mice were compared with respect to expression of cell surface molecules, TCR gene utilization, binding of tetrameric KdHA complexes, lytic mechanisms, and diabetogenic potential. No evidence was found for reduced expression of TCR or CD8 by InsHA-derived CTL, nor was there evidence for a defect in triggering lytic activity. However, avidity differences between CD8+ clones correlated with their ability to bind KdHA tetramers. These results argue that most of the KdHA-specific T lymphocytes in InsHA mice are not intrinsically different from KdHA-specific T lymphocytes isolated from conventional animals. They simply express TCRs that are less avid in their binding to KdHA.




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