Impaired thymic output in patients with chronic hepatitis C virus infection

HJ Hartling, JC Gaardbo, A Ronit… - Scandinavian …, 2013 - Wiley Online Library
HJ Hartling, JC Gaardbo, A Ronit, M Salem, M Laye, MR Clausen, K Skogstrand, J Gerstoft
Scandinavian journal of immunology, 2013Wiley Online Library
Altered T cell homeostasis in chronic hepatitis C virus (HCV) infection has been
demonstrated. However, it is unknown whether fibrosis is associated with more perturbed T
cell homeostasis in chronic HCV infection. The aim of this study was to examine and
compare T cell subsets including recent thymic emigrants (RTE), naive, memory, senescent,
apoptotic and IL‐7 receptor α (CD 127) expressing CD 4+ and CD 8+ T cells as well as
telomere length and interferon‐γ production in HCV‐infected patients with (n= 25) and …
Abstract
Altered T cell homeostasis in chronic hepatitis C virus (HCV) infection has been demonstrated. However, it is unknown whether fibrosis is associated with more perturbed T cell homeostasis in chronic HCV infection. The aim of this study was to examine and compare T cell subsets including recent thymic emigrants (RTE), naive, memory, senescent, apoptotic and IL‐7 receptor α (CD127) expressing CD4+ and CD8+ T cells as well as telomere length and interferon‐γ production in HCV‐infected patients with (n = 25) and without (n = 26) fibrosis as well as in healthy controls (= 24). Decreased proportions of CD4+ and CD8+ RTE were found in HCV‐infected patients, especially in HCV‐infected patients with fibrosis (14.3% (9.7–23.0) and 28.8% (16.1–40.5), respectively) compared with healthy controls (24.2% (16.3–32.1), P = 0.004 and 39.1% (31.6–55.0), P = 0.010, respectively). Furthermore, HCV‐infected patients with fibrosis presented with a higher proportion of CD4+ T cells expressing CD127 compared with HCV‐infected patients without fibrosis [88.4% (84.5–91.0) versus 83.8% (79.9–86.8), P = 0.016]. Thus, impaired thymic output in HCV infection was found, and high proportion of CD127+ T cells may illustrate a compensatory mechanism to preserve T cell counts.
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