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A tetrameric recombinant major histocompatibility complex (MHC) class II-peptide complex was used to quantitate human immunodeficiency virus type 1 (HIV-1) envelope (Env)-specific CD4(+) T cells in vaccinated and in simian/human immunodeficiency virus (SHIV)-infected rhesus monkeys. A rhesus monkey MHC class II DR molecule, Mamu-DR*W201, and an HIV-1 Env peptide (p46) were employed to construct this tetrameric complex. A p46-specific proliferative response was seen in sorted, tetramer-binding, but not nonbinding, CD4(+) T cells, directly demonstrating that this response was mediated by the epitope-specific lymphocytes. Although staining of whole blood from 10 SHIV-infected Mamu-DR*W201(+) rhesus monkeys failed to demonstrate tetramer-binding CD4(+) T cells (&lt;0.02%), p46-stimulated peripheral blood mononuclear cells (PBMCs) from 9 of these 10 monkeys had detectable p46 tetramer-binding cells, comprising 0.5 to 15.2% of the CD4(+) T cells. p46-stimulated PBMCs from 7 of 10 Mamu-DR*W201(+) monkeys vaccinated with a recombinant canarypox virus-HIV-1 env construct also demonstrated p46 tetramer-binding cells, comprising 0.9 to 7.2% of the CD4(+) T cells. Thus, Env p46-specific CD4(+) T cells can be detected by tetrameric Mamu-DR*W201-p46 complex staining of PBMCs in both SHIV-infected and vaccinated rhesus monkeys. These epitope-specific cell populations appear to be present in peripheral blood at a very low frequency.

journal of virology

Human Immunodeficiency Virus Type 1 Envelope Epitope-Specific CD4<sup>+</sup>T Lymphocytes in Simian/Human Immunodeficiency Virus-Infected and Vaccinated Rhesus Monkeys Detected Using a Peptide-Major Histocompatibility Complex Class II Tetramer

Human Immunodeficiency Virus Type 1 Envelope Epitope-Specific CD4+T Lymphocytes in Simian/Human Immunodeficiency Virus-Infected and Vaccinated Rhesus Monkeys Detected Using a Peptide-Major Histocompatibility Complex Class II Tetramer

Human Immunodeficiency Virus Type 1 Envelope Epitope-Specific CD4⁺T Lymphocytes in Simian/Human Immunodeficiency Virus-Infected and Vaccinated Rhesus Monkeys Detected Using a Peptide-Major Histocompatibility Complex Class II Tetramer