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*
Department of Immunohematology and Blood Bank, Leiden University Medical Center, Leiden, The Netherlands; and
CLB, Sanquin Blood Supply Foundation, Department of Clinical Viro-Immunology, Laboratory for Experimental and Clinical Immunology, Academical Medical Center, University of Amsterdam, Amsterdam, The Netherlands
CD4+ Th cells play an important role in the induction and maintenance of specific T cell immunity. Indications for a protective role of CD4+ T cells against HIV-1 infection were found in subjects who were able to control HIV-1 viremia as well as in highly HIV-1-exposed, yet seronegative, individuals. This study describes the identification of an HIV-1-specific Th epitope that exhibits high affinity binding as well as high immunogenicity in the context of at least four different HLA-DR molecules that together cover 50–60% of the Caucasian, Oriental, and Negroid populations. This HIV-1 reverse transcriptase-derived peptide (RT171–190) is highly conserved among different HIV-1 isolates. Importantly, stimulation of PBL cultures from HIV-1 seronegative donors with this peptide resulted in Th1-type lymphocytes capable of efficient recognition of HIV-1-pulsed APCs. Taken together, these data indicate that peptide RT171–190 constitutes an attractive component of vaccines aiming at induction or enhancement of HIV-1-specific T cell immunity.
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