The Journal of Experimental Medicine
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Published online 3 April 2000.
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© The Rockefeller University Press, 0022-1007/2000/4/1221/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 7, April 3, 2000 1221-1232


Original Article

Self-Tolerance to the Murine Homologue of a Tyrosinase-derived Melanoma Antigen: Implications for Tumor Immunotherapy

Teresa A. Colellaa, Timothy N.J. Bullocka, Liane B. Russellb, David W. Mullinsa, Willem W. Overwijkc, Chance John Luckeya, Richard A. Piercea, Nicholas P. Restifoc, and Victor H. Engelharda
a Department of Microbiology and the Beirne Carter Center for Immunology Research, University of Virginia, Charlottesville, Virginia 22908
b Life Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
c Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892

Correspondence to: Victor H. Engelhard, Department of Microbiology and the Beirne Carter Center for Immunology Research, University of Virginia, Charlottesville, VA 22908. Tel:804-924-2423 Fax:804-924-1221 E-mail:vhe{at}virginia.edu.

The human tyrosinase-derived peptide YMDGTMSQV is presented on the surface of human histocompatibility leukocyte antigen (HLA)-A*0201+ melanomas and has been suggested to be a tumor antigen despite the fact that tyrosinase is also expressed in melanocytes. To gain information about immunoreactivity and self-tolerance to this antigen, we established a model using the murine tyrosinase-derived homologue of this peptide FMDGTMSQV, together with transgenic mice expressing the HLA-A*0201 recombinant molecule AAD. The murine peptide was processed and presented by AAD similarly to its human counterpart. After immunization with recombinant vaccinia virus encoding murine tyrosinase, we detected a robust AAD-restricted cytotoxic T lymphocyte (CTL) response to FMDGTMSQV in AAD transgenic mice in which the entire tyrosinase gene had been deleted by a radiation-induced mutation. A residual response was observed in the AAD+tyrosinase+ mice after activation under certain conditions. At least some of these residual CTLs in AAD+tyrosinase+ mice were of high avidity and induced vitiligo upon adoptive transfer into AAD+tyrosinase+ hosts. Collectively, these data suggest that FMDGTMSQV is naturally processed and presented in vivo, and that this presentation leads to substantial but incomplete self-tolerance. The relevance of this model to an understanding of the human immune response to tyrosinase is discussed.

Key Words: tyrosinase, self-tolerance, MHC class I, cytotoxic T lymphocytes, immunotherapy


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