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J. Exp. Med.,
Volume 187, Number 9, May 4, 1998 1373-1381
By
§
§
From the * Harvard Medical School, Division of Viral Pathogenesis, Department of Medicine, Beth
Israel Deaconess Medical Center, Boston, Massachusetts 02215; A tetrameric recombinant major histocompatibility complex (MHC) class I-peptide complex
was used as a staining reagent in flow cytometric analyses to quantitate and define the phenotype of Gag-specific cytotoxic T lymphocytes (CTLs) in the peripheral blood of simian immunodeficiency virus macaque (SIVmac)-infected rhesus monkeys. The heavy chain of the rhesus
monkey MHC class I molecule Mamu-A*01 and
Wisconsin Regional Primate
Research Center and § Department of Pathology and Laboratory Medicine, University of Wisconsin,
Madison, Wisconsin 53715;
Eppimune, San Diego, California 92121; and the ¶ Coulter
Corporation, Miami, Florida 33116
2-microglobulin were refolded in the presence of an SIVmac Gag synthetic peptide (p11C, C-M) representing the optimal nine-amino
acid peptide of Mamu-A*01-restricted predominant CTL epitope to create a tetrameric
Mamu-A*01/p11C, C-M complex. Tetrameric Mamu-A*01/p11C, C-M complex bound to
T cells of SIVmac-infected, Mamu-A*01+, but not uninfected, Mamu-A*01+, or infected,
Mamu-A*01
rhesus monkeys. Specific staining of peripheral blood mononuclear cells
(PBMC) from SIVmac-infected, Mamu-A*01+ rhesus monkeys was only found in the cluster
of differentiation (CD)8
/
+ T lymphocyte subset and the percentage of CD8
/
+ T cells in
the peripheral blood of four SIVmac-infected, Mamu-A*01+ rhesus monkeys staining with this
complex ranged from 0.7 to 10.3%. Importantly, functional SIVmac Gag p11C-specific CTL
activity was seen in sorted and expanded tetrameric Mamu-A*01/p11C, C-M complex-binding, but not nonbinding, CD8
/
+ T cells. Furthermore, the percentage of CD8
/
+ T cells
binding this tetrameric Mamu-A*01/p11C, C-M complex correlated well with p11C-specific
cytotoxic activity as measured in both bulk and limiting dilution effector frequency assays. Finally, phenotypic characterization of the cells binding this tetrameric complex indicated that
this lymphocyte population is heterogeneous. These studies indicate the power of this approach
for examining virus-specific CTLs in in vivo settings.
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