HIV-activated human plasmacytoid DCs induce Tregs through an indoleamine 2,3-dioxygenase-dependent mechanism

Olivier Manches, David Munn, Anahita Fallahi, Jeffrey Lifson, Laurence Chaperot, Joel Plumas, Nina Bhardwaj

Research output: Contribution to journalArticlepeer-review

184 Scopus citations


Plasmacytoid DCs (pDCs) have been implicated as crucial cells in antiviral immune responses. On recognizing HIV, they become activated, secreting large amounts of IFN-α and inflammatory cytokines, thereby potentiating innate and adaptive antiviral immune responses. Here, we have shown that HIV-stimulated human pDCs can also induce the differentiation of naive CD4+ T cells into Tregs with suppressive function. This differentiation was independent of pDC production of IFN-α and primarily dependent on pDC expression of indoleamine 2,3-dioxygenase, which was induced through the TLR/MyD88 pathway, following binding of HIV to CD4 and triggering of TLR7 by HIV genomic RNA. Functionally, the Tregs induced by pDCs were shown to inhibit the maturation of bystander conventional DCs. This study therefore reveals what we believe to be a novel mechanism by which pDC may regulate and potentially limit anti-HIV immune responses.

Original languageEnglish (US)
Pages (from-to)3431-3439
Number of pages9
JournalJournal of Clinical Investigation
Issue number10
StatePublished - Oct 1 2008

ASJC Scopus subject areas

  • Medicine(all)

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