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• W2148742397 abstract "Approximately 50% of acute viral hepatitis in young adults and in pregnant women is due to hepatitis E virus (HEV) infection in developing countries. T cell-mediated immune injury probably plays a key role in the pathogenesis of acute hepatitis illness. However, there is a paucity of data on the global gene expression programs activated on T cells, which are subsequently responsible for T cell recruitment to the liver and triggering of immune injury.We performed a flow cytometric analysis of T cells in individuals with acute hepatitis E (AVH-E; n=10), resolving phase of HEV (n=9), and ten healthy controls (HC). Further transcriptional profiling analysis was performed using Affymetrix GeneChip DNA microarrays to identify the genes that were differentially expressed in AVH-E and HC.Patients with AVH-E showed higher frequencies of CD8+ (27 ± 4%; P=0.02) and activated CD38+ CD69+ T cells (25% ± 3%; P=0.04) than in resolving phase patients (20 ± 2% and 9.1 ± 4%, respectively), who in turn exhibited higher CCR9 expression than cells from patients in active phase. The naïve T cell population (CD3+ CD45RA+) was decreased upon HEV infection (29 ± 4% in AVH-E vs. 53.1 ± 3.2% in HC; P=0.05); however, the CD11a high subpopulation within CD4+ CD45RA+ cells was increased in both AVH-E (6.1%) and resolving phase (7.7%) patients. Gene ontology analysis suggested that during AVH-E infection, there is in CD4+ T cells an activation of genes involved in pro-inflammatory responses. Additional RT-PCR analysis confirmed that in cells from AVH-E patients, there is an increased expression of CCR5, CCR9, CXCR3, CXCR4, STAT1, IRF-9, IFN-α, and TNF-α, together with a down-regulation of IL-2, SOCS3, and IL-10, with respect to cells from resolving phase patients.Our findings suggest the involvement of a circulating CD45RA+ CD11a high population with CCR5 expression in the pathogenesis processes of AVH-E. The obtained results help to understand the underlying inflammatory process occurring in HEV infection, which can lead to either resolution or immunopathology." @default.
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• W2148742397 date "2011-02-03" @default.
• W2148742397 modified "2023-10-16" @default.
• W2148742397 title "Gene Expression Profiles of T Cells from Hepatitis E Virus Infected Patients in Acute and Resolving Phase" @default.
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• W2148742397 doi "https://doi.org/10.1007/s10875-010-9506-2" @default.
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