scholarly journals High Serum Hepatitis C Virus (HCV) RNA Load Predicts the Presence of HCV RNA in Saliva from Individuals with Chronic and Acute HCV Infection

2006 ◽  
Vol 193 (5) ◽  
pp. 672-676 ◽  
Author(s):  
Chia C. Wang ◽  
Chihiro Morishima ◽  
Minjun Chung ◽  
Rebecca Engelberg ◽  
Elizabeth Krantz ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
High Serum ◽  
Hcv Infection ◽  
Hcv Rna ◽  
Serum Hepatitis ◽  
Acute Hcv ◽  
Acute Hcv Infection

scholarly journals Rate of Sustained Virologic Response in Relation to Baseline Hepatitis C Virus (HCV) RNA Level and Rapid Virologic Clearance in Persons with Acute HCV Infection

2009 ◽  
Vol 200 (6) ◽  
pp. 877-881 ◽  
Author(s):  
Barbara H. McGovern ◽  
Ellen H. Nagami ◽  
Christopher E. Birch ◽  
Melinda J. Bowen ◽  
Laura L. Reyor ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Sustained Virologic Response ◽  
Virologic Response ◽  
Hcv Infection ◽  
Hcv Rna ◽  
Acute Hcv ◽  
Acute Hcv Infection

scholarly journals Analysis of Successful Immune Responses in Persons Infected with Hepatitis C Virus

2000 ◽  
Vol 191 (9) ◽  
pp. 1499-1512 ◽  
Author(s):  
Franziska Lechner ◽  
David K.H. Wong ◽  
P. Rod Dunbar ◽  
Roger Chapman ◽  
Raymond T. Chung ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
T Lymphocyte ◽  
Cytotoxic T Lymphocyte ◽  
Acute Infection ◽  
Hcv Infection ◽  
Ctl Response ◽  
Acute Hcv ◽  
Ifn Γ ◽  
Acute Hcv Infection

Although hepatitis C virus (HCV) infection is very common, identification of patients during acute infection is rare. Consequently, little is known about the immune response during this critical stage of the disease. We analyzed the T lymphocyte response during and after acute resolving HCV infection in three persons, using interferon (IFN)-γ enzyme-linked immunospot (ELISPOT) and human histocompatibility leukocyte antigen (HLA) peptide tetramer assays. Acute infection was associated with a broadly directed T helper and cytotoxic T lymphocyte (CTL) response, which persisted after resolution of clinical hepatitis and clearance of viremia. At the earliest time point studied, highly activated CTL populations were observed that temporarily failed to secrete IFN-γ, a “stunned” phenotype, from which they recovered as viremia declined. In long-term HCV-seropositive persons, CTL responses were more common in persons who had cleared viremia compared with those with persistent viremia, although the frequencies of HCV-specific CTLs were lower than those found in persons during and after resolution of acute HCV infection. These studies demonstrate a strong and persistent CTL response in resolving acute HCV infection, and provide rationale to explore immune augmentation as a therapeutic intervention in chronic HCV infection.

scholarly journals PD-1 Expression in Acute Hepatitis C Virus (HCV) Infection Is Associated with HCV-Specific CD8 Exhaustion

2006 ◽  
Vol 80 (22) ◽  
pp. 11398-11403 ◽  
Author(s):  
Simona Urbani ◽  
Barbara Amadei ◽  
Daniela Tola ◽  
Marco Massari ◽  
Simona Schivazappa ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Cell Function ◽  
Hcv Infection ◽  
Acute Hepatitis C ◽  
Inhibitory Receptor ◽  
Cd8 Cells ◽  
Acute Hcv ◽  
Cd8 Cell ◽  
Acute Hcv Infection

ABSTRACT Hepatitis C virus (HCV)-specific CD8 cell exhaustion may represent a mechanism of HCV persistence. The inhibitory receptor PD-1 has been reported to be up-regulated in exhausted CD8 cells. Therefore, we studied PD-1 expression longitudinally during acute HCV infection. Most HCV-specific CD8 cells expressed PD-1 at the time of acute illness, irrespective of the final outcome. PD-1 expression declined with the acquisition of a memory phenotype and recovery of an efficient CD8 cell function in resolving HCV infections, whereas high levels were maintained when HCV persisted and HCV-specific CD8 cells remained dysfunctional. Blocking PD-1/PDL-1 interaction with an anti-PDL-1 antibody improved the capacity of expansion of virus-specific CD8 cells.

scholarly journals High Level of PD-1 Expression on Hepatitis C Virus (HCV)-Specific CD8+ and CD4+ T Cells during Acute HCV Infection, Irrespective of Clinical Outcome

2011 ◽  
Vol 85 (9) ◽  
pp. 4633-4633
Author(s):  
V. Kasprowicz ◽  
J. S. zur Wiesch ◽  
T. Kuntzen ◽  
B. E. Nolan ◽  
S. Longworth ◽  
...  
Keyword(s):  
T Cells ◽  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Clinical Outcome ◽  
Cd4 T Cells ◽  
Hcv Infection ◽  
Acute Hcv ◽  
High Level ◽  
Acute Hcv Infection

scholarly journals O22.2 Detection of hepatitis c virus (hcv) in semen from hiv-infected men who have sex with men (msm) during acute hcv infection

2015 ◽  
Vol 91 (Suppl 2) ◽  
pp. A74.2-A75
Author(s):  
S Turner ◽  
M Yip ◽  
D Smith ◽  
S Weibel ◽  
W van Seggelen ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Hcv Infection ◽  
Acute Hcv ◽  
Sex With Men ◽  
Acute Hcv Infection

scholarly journals Impaired Hepatitis C Virus (HCV)-Specific Effector CD8+ T Cells Undergo Massive Apoptosis in the Peripheral Blood during Acute HCV Infection and in the Liver during the Chronic Phase of Infection

2008 ◽  
Vol 82 (20) ◽  
pp. 9808-9822 ◽  
Author(s):  
Henry Radziewicz ◽  
Chris C. Ibegbu ◽  
Huiming Hon ◽  
Melissa K. Osborn ◽  
Kamil Obideen ◽  
...  
Keyword(s):  
T Cells ◽  
Hepatitis C Virus ◽  
Hepatitis C ◽  
T Cell ◽  
Chronic Phase ◽  
T Cell Response ◽  
Hcv Infection ◽  
Caspase 9 ◽  
Acute Hcv ◽  
Acute Hcv Infection

ABSTRACT A majority of patients infected with hepatitis C virus (HCV) do not sustain an effective T-cell response, and viremia persists. The mechanism leading to failure of the HCV-specific CD8+ T-cell response in patients developing chronic infection is unclear. We investigated apoptosis susceptibility of HCV-specific CD8+ T cells during the acute and chronic stages of infection. Although HCV-specific CD8+ T cells in the blood during the acute phase of infection and in the liver during the chronic phase were highly activated and expressed an effector phenotype, the majority was undergoing apoptosis. In contrast, peripheral blood HCV-specific CD8+ T cells during the chronic phase expressed a resting memory phenotype. Apoptosis susceptibility of HCV-specific CD8+ T cells was associated with very high levels of programmed death-1 (PD-1) and low CD127 expression and with significant functional T-cell deficits. Further evaluation of the “death phase” of HCV-specific CD8+ T cells during acute HCV infection showed that the majority of cells were dying by a process of cytokine withdrawal, mediated by activated caspase 9. Contraction during the acute phase occurred rapidly via this process despite the persistence of the virus. Remarkably, in the chronic phase of HCV infection, at the site of infection in the liver, a substantial frequency of caspase 9-mediated T-cell death was also present. This study highlights the importance of cytokine deprivation-mediated apoptosis with consequent down-modulation of the immune response to HCV during acute and chronic infections.

scholarly journals Acute hepatitis C virus infection

2008 ◽  
Vol 13 (21) ◽  
Author(s):  
W L Irving ◽  
D Salmon ◽  
C Boucher ◽  
I M Hoepelman
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Hcv Infection ◽  
Acute Hepatitis C ◽  
Acute Hcv ◽  
Chronic Hcv Infection ◽  
Chronic Hcv ◽  
The Individual ◽  
Acute Hcv Infection ◽  
Subsequent Risk

Around 25% of people infected with hepatitis C virus (HCV) are able to clear the infection spontaneously, while the majority become chronically infected, with a subsequent risk for the individual patient of progressive inflammatory liver disease, cirrhosis, hepatocellular carcinoma and liver-related death (Figure 1). Much is known about the epidemiology, pathogenesis, diagnosis and management of chronic HCV infection. In comparison, knowledge about acute HCV infection is patchy. In this article, we will highlight concerns relating to acute HCV infection and suggest that public health bodies responsible for managing the HCV epidemic should redirect at least some of their resources to dealing with these issues.

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