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Surgery Branch, National Cancer Institute, NIH, Bethesda, Maryland 20892 [K. R. I., M. R. P., E. P. S., J. P. T., M. C., C. E. T., P. F. R., S. A. R., N. P. R.]; Therion Biologics Corporation, Cambridge, Massachusetts 02142 [A. G. Y., P. G.]; and Leiden University Medical Center, Leiden, The Netherlands, 2333 ZA [R. P. M. S., R. O.]
To study the induction of anti-"self" CD8+ T-cell reactivity against the tumor antigen gp100, we used a mouse transgenic for a chimeric HLA-A*0201/H-2 Kb molecule (A2/Kb). We immunized the mice with a recombinant vaccinia virus encoding a form of gp100 that had been modified at position 210 (from a threonine to a methionine) to increase epitope binding to the restricting class I molecule. Immunogens containing the "anchor-fixed" modification elicited anti-self CD8+ T cells specific for the wild-type gp100209217 peptide pulsed onto target cells. More important, these cells specifically recognized the naturally presented epitope on the surface of an A2/Kb-expressing murine melanoma, B16. These data indicate that anchor-fixing epitopes could enhance the function of recombinant virus-based immunogens.
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