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HLA-A*02 tetramers complexed to human immunodeficiency virus (HIV) Gag SLYNTVATL and HIV Pol ILKEPVHGV peptides were used to characterize HLA class I-restricted CD8(+) T cells in 41 HIV-infected children. The frequencies and the phenotype of specific circulating CD8(+) T cells were determined in whole-blood samples by means of cytometric analysis. Background staining of 13 HLA-A*02-negative patients showed that the frequency of CD8(+) T cells was &lt;0.01%. Of the 28 HLA-A*02-positive patients, blood samples from 26 stained positive at least once the Gag tetramer (mean CD8(+) T cells, 0.87%; range, 0.1%-3.9%), and blood samples from 21 stained positive for the Pol tetramer (mean CD8(+) T cells, 0.59%; range, 0.1%-5.5%). The tetramer-binding cells were CD28(-), CD45RA(-), CD45RO(+), HLA-DR(+), and CD69(-) T lymphocytes. HIV-specific CD8(+) T cells can be detected easily in peripheral blood of HIV-infected children, using HLA tetramers combined with HIV peptides. These cells are memory activated CD28(-)CD8(+) T lymphocytes.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Frequency and Phenotyping of Human Immunodeficiency Virus (HIV)–Specific CD8<sup>+</sup>T Cells in HIV‐Infected Children, Using Major Histocompatibility Complex Class I Peptide Tetramers

Frequency and Phenotyping of Human Immunodeficiency Virus (HIV)–Specific CD8+T Cells in HIV‐Infected Children, Using Major Histocompatibility Complex Class I Peptide Tetramers

Frequency and Phenotyping of Human Immunodeficiency Virus (HIV)–Specific CD8⁺T Cells in HIV‐Infected Children, Using Major Histocompatibility Complex Class I Peptide Tetramers