Related Experiment Video

Updated: Aug 11, 2026

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
12:09

Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation

Published on: February 28, 2019

Why do cytotoxic T lymphocytes fail to eliminate hepatitis C virus? Lessons from studies using major

F Lechner1, J Sullivan, H Spiegel

  • 1Nuffield Department of Medicine, John Radcliffe Hospital, Oxford, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|February 24, 2001
PubMed

Insights

Hepatitis C virus (HCV) infection causes persistent illness. Early cytotoxic T lymphocyte (CTL) responses are strong but decline, leading to

Area of Science:

  • Immunology
  • Virology
  • Hepatology

Background:

  • Hepatitis C virus (HCV) infection is a global health issue with high persistence rates.
  • Chronic HCV infection can lead to severe liver damage, including inflammation, fibrosis, and failure.
  • The role of T lymphocyte responses, especially cytotoxic T lymphocytes (CTLs), in HCV outcome is unclear.

Purpose of the Study:

  • To analyze immune responses in individuals with Hepatitis C virus (HCV) infection.
  • To investigate the dynamics of CTL responses during different stages of HCV disease.

Main Methods:

  • Utilized major histocompatibility complex (MHC) class I peptide tetrameric complexes (tetramers).
  • Analyzed immune responses in HCV-infected individuals across various disease stages.

Main Results:

  • CTL responses against HCV were vigorous during early infection phases.
  • Both the number and function of CTLs diminished over time in chronic HCV infection.
  • Observed a decline in adaptive immune surveillance against the virus.

Conclusions:

  • The study highlights a 'CTL failure' phenomenon in chronic Hepatitis C virus (HCV) infection.
  • This decline in CTL response may contribute to viral persistence and disease progression.
  • Further research is needed to understand the mechanisms behind CTL failure in HCV.

More Related Videos

Stem Cell-Derived Viral Ag-Specific T Lymphocytes Suppress HBV Replication in Mice07:25

Stem Cell-Derived Viral Ag-Specific T Lymphocytes Suppress HBV Replication in Mice

Published on: September 25, 2019

Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix10:37

Analysis of HBV-Specific CD4 T-cell Responses and Identification of HLA-DR-Restricted CD4 T-Cell Epitopes Based on a Peptide Matrix

Published on: October 20, 2021

Related Concept Videos

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Hepatitis01:25

Hepatitis

Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...