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Departments of
*
Pathology, and
Microbiology and Immunology and Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA 30322
T cells are critical for clearing infection and preventing tumors
induced by polyoma virus, a natural murine papovavirus. We previously
identified the immunodominant epitope for polyoma virus-specific CTL in
tumor-resistant H-2k mice as the Dk-restricted
peptide, MT389397, derived from the polyoma middle T oncoprotein. In
this study, we developed tetrameric Dk complexes containing
the MT389397 peptide to directly visualize and enumerate
MT389397-specific CTL during polyoma virus infection. We found that
Dk/MT389 tetramer+CD8+ T cells
undergo a massive expansion during primary infection such that by day 7
postinfection these Ag-specific CD8+ T cells constitute
20% of the total and
40% of the activated CD8+ T
cells in the spleen. This expansion of Dk/MT389
tetramer+CD8+ T cells parallels the emergence
of MT389397-specific ex vivo cytolytic activity and clearance of
polyoma virus. Notably, Dk/MT389
tetramer+CD8+ T cells are maintained in memory
at very high levels. The frequencies of Dk/MT389
tetramer+CD8+ effector and memory T cells in
vivo match those of CD8+ T cells producing intracellular
IFN-
after 6-h in vitro stimulation by MT389397 peptide.
Consistent with preferential Vß6 expression by MT389397-specific
CD8+CTL lines and clones, Dk/MT389
tetramer+CD8+ T cells exhibit biased expression
of this Vß gene segment. Finally, we show that Dk/MT389
tetramer+CD8+ T cells efficiently infiltrate a
polyoma tumor challenge to virus-immune mice. Taken together, these
findings strongly implicate virus-induced MT389397-specific
CD8+ T cells as essential effectors in eliminating
polyoma-infected and polyoma-transformed cells in
vivo.
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