The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1997/8/455/ $5.00
The Journal of Experimental Medicine, Volume 186, Number 3, August 4, 1997 455-460


Brief Definitive Reports

Antigen-driven C–C Chemokine-mediated HIV-1 Suppression by CD4+ T Cells from Exposed Uninfected Individuals Expressing the Wild-type CCR-5 Allele

Lucinda Furci*, Gabriella Scarlatti*, Samuele Burastero*, Giuseppe Tambussi*, Claudia Colognesi*, Caroline Quillent{ddagger}, Renato Longhi*, Patrizia Loverro*, Barbara Borgonovo*, Davide Gaffi*, Emily Carrow{ddagger}, Mauro Malnati*, Paolo Lusso*, Antonio G. Siccardi*, Adriano Lazzarin*, and Alberto Beretta{ddagger}

From the * Department of Biological and Technological Research, San Raffaele Scientific Institute, Milan, Italy; and {ddagger} Centre Intégré de Recherches Biocliniques sur le SIDA (CIRBS), Paris, France

Despite repeated exposure to HIV-1, certain individuals remain persistently uninfected. Such exposed uninfected (EU) people show evidence of HIV-1–specific T cell immunity and, in rare cases, selective resistance to infection by macrophage-tropic strains of HIV-1. The latter has been associated with a 32–base pair deletion in the C–C chemokine receptor gene CCR-5, the major coreceptor of macrophage-tropic strains of HIV-1. We have undertaken an analysis of the HIV-specific T cell responses in 12 EU individuals who were either homozygous for the wild-type CCR-5 allele or heterozygous for the deletion allele (CCR-5{Delta}32). We have found evidence of an oligoclonal T cell response mediated by helper T cells specific for a conserved region of the HIV-1 envelope. These cells produce very high levels of C–C chemokines when stimulated by the specific antigen and suppress selectively the replication of macrophage-tropic, but not T cell–tropic, strains of HIV-1. These chemokine-producing helper cells may be part of a protective immune response that could be potentially exploited for vaccine development.


Address correspondence to Dr. Alberto Beretta, Centre Intégré de Recherches Biocliniques sur le SIDA, 185 rue Raymond Losserand, 75014 Paris, France. Phone: 33-1-44-12-31-74; FAX: 33-1-44-12-32-70; E-mail: cirbs{at}imaginet.fr


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