Naive CD4 T cells inhibit CD28-costimulated R5 HIV replication in memory CD4 T cells

Mengozzi, Manuela, Malipatlolla, Meena, De Rosa, Stephen C, Herzenberg, Leonard A, Herzenberg, Leonore A and Roederer, Mario (2001) Naive CD4 T cells inhibit CD28-costimulated R5 HIV replication in memory CD4 T cells. Proceedings of the National Academy of Sciences of the United States of America, 98 (20). pp. 11644-11649. ISSN 0027-8424

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Abstract

Stimulation with antibodies to CD3 and CD28 coimmobilized on beads can be used to significantly expand T cells ex vivo. With CD4 T cells from HIV-infected patients, this expansion usually is accompanied by complete suppression of viral replication, presumed to be caused by down-regulation of the viral coreceptor CCR5 and up-regulation of CCR5 ligands. Here we show that this suppression occurs in total CD4 T cells acutely infected with R5 HIV, but not in purified CD62L(-) memory CD4 T cells. The lack of complete suppression in these memory cells, typically comprising 10-40% of total CD4 T cells, occurs despite high levels of CCR5 ligand secretion and down-regulation of CCR5. Significantly, adding back naive or CD62L(+) memory CD4 T cells inhibits the viral replication in the CD62L(-) cells, with the naive cells capable of completely repressing the virus. Although this inhibition was previously thought to be specific to bead-bound anti-CD3/CD28 stimulation, we show that the same suppression is obtained with sufficiently strong anti-CD3/B7.1 stimulation. Our results show that inhibitory mechanisms, expressed predominantly by strongly stimulated naive CD4 T cells and mediated independently of CCR5-binding chemokines, play a role in the inhibition of R5 HIV replication in CD4 T cells upon CD28 costimulation

Item Type: Article
Schools and Departments: Brighton and Sussex Medical School > Clinical and Experimental Medicine
Subjects: Q Science > Q Science (General)
Depositing User: Manuela Mengozzi
Date Deposited: 14 Nov 2012 08:50
Last Modified: 05 Oct 2017 18:27
URI: http://sro.sussex.ac.uk/id/eprint/42338
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