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17376921

Source:http://linkedlifedata.com/resource/pubmed/id/17376921

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pubmed-article:17376921pubmed:abstractTextThe role of peripheral dendritic cells (DCs) in hepatitis C virus (HCV) infection is unclear. To determine if persistent infection exerts an inhibitory pressure on HCV-specific innate responses, we analyzed DC function in blood through quantification of cell-associated HCV RNA levels in conjunction with multiparametric flow cytometry analysis of pathogen recognition receptor-induced cytokine expression. Independently of the serum viral load, fluorescence-activated cell sorter-purified total DCs had a wide range of cell-associated HCV genomic RNA copy numbers (mean log(10), 5.0 per 10(6) cells; range, 4.3 to 5.8). Here we report that for viremic patients with high viral loads in their total DCs, the myeloid DC (MDC) subset displayed impaired expression of interleukin-12 (IL-12) and tumor necrosis factor alpha (TNF-alpha) but normal IL-6 or chemokine CCL3 expression in response to poly(I:C) and lipopolysaccharide (LPS). IL-6-expressing cells from this subgroup of viremic patients demonstrated a significant increase (sixfold more) in TNF-alpha(-) IL-12(-) cell frequency compared to healthy donors (mean, 38.8% versus 6.5%; P < 0.0001), indicating a functional defect in a subpopulation of cytokine-producing MDCs ( approximately 6% of MDCs). Attenuation of poly(I:C) and LPS innate sensing was HCV RNA density dependent and did not correlate with viremia or deficits in circulating MDC frequencies in HCV-infected patients. Monocytes from these patients were functionally intact, responding normally on a per-cell basis following stimulation, independent of cell-associated HCV RNA levels. Taken together, these data indicate that detection of HCV genomic RNA in DCs and loss of function in the danger signal responsiveness of a small proportion of DCs in vivo are interrelated rather than independent phenomena.lld:pubmed
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pubmed-article:17376921pubmed:authorpubmed-author:BruneauJulieJlld:pubmed
pubmed-article:17376921pubmed:authorpubmed-author:LamarreDaniel...lld:pubmed
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pubmed-article:17376921pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:17376921pubmed:year2007lld:pubmed
pubmed-article:17376921pubmed:articleTitlePoly(I:C) and lipopolysaccharide innate sensing functions of circulating human myeloid dendritic cells are affected in vivo in hepatitis C virus-infected patients.lld:pubmed
pubmed-article:17376921pubmed:affiliationCentre Hospitalier de l'Université de Montréal, Hôpital Saint-Luc, 264 Boul. René-Lévesque Est, Rm. EA-312, Montréal, Québec, Canada H2X 1P1.lld:pubmed
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