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Human cytomegalovirus pp65- and immediate early 1 antigen-specific HLA class I-restricted cytotoxic T cell responses induced by cross-presentation of viral antigens

Tabi, Zsuzsanna, Moutaftsi, Magdalena and Borysiewicz, Leszek K. 2001. Human cytomegalovirus pp65- and immediate early 1 antigen-specific HLA class I-restricted cytotoxic T cell responses induced by cross-presentation of viral antigens. The Journal of Immunology 166 (9) , pp. 5695-5703.

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Abstract

Dendritic cells (DCs) play a pivotal role in the development of anti-viral CD8+ CTL responses. This is straightforward if they are directly infected with virus, but is less clear in response to viruses that cannot productively infect DCs. Human CMV (HCMV) shows strain-specific cell tropism: fibroblast (Fb)-adapted laboratory strains (AD169) and recent clinical isolates do not infect DCs, whereas endothelial cell-adapted strains (TB40/E) result in productive lytic DC infection. However, we show here that uninfected DCs induce CD8+ T cell cytotoxicity and IFN- production against HCMV pp65 and immediate early 1 Ags following in vitro coculture with HCMV-AD169-infected Fbs, regardless of the HLA type of these Fbs. CD8+ T cell stimulation was inhibited by pretreatment of DCs with cytochalasin B or brefeldin A, indicating a phagosome/endosome to cytosol pathway. HCMV-infected Fbs were not apoptotic as measured by annexin V binding, and induction of apoptosis of infected Fbs in vitro did not augment CTL induction by DCs, suggesting a mechanism other than apoptosis in the initiation of cross-presentation. Furthermore, HCMV-infected Fbs provided a maturation signal for immature DCs during coculture, as evidenced by increased CD83 and HLA class II expression. Cross-presentation of HCMV Ags by host DCs enables these professional APCs to bypass some of the evasion mechanisms HCMV has developed to avoid T cell recognition. It may also serve to explain the presence of immediate early 1 Ag-specific CTLs in the face of pp65-induced inhibition of Ag presentation at the level of the infected cell.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Publisher: American Association of Immunologists
ISSN: 0022-1767
Last Modified: 04 Jun 2017 01:31
URI: http://orca.cf.ac.uk/id/eprint/316

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