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Related Concept Videos

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...
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...
Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
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.
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview

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Related Experiment Video

Updated: May 17, 2026

Two Methods of Heterokaryon Formation to Discover HCV Restriction Factors
16:49

Two Methods of Heterokaryon Formation to Discover HCV Restriction Factors

Published on: July 16, 2012

Innate immunity and HCV.

Markus H Heim1

  • 1Division of Gastroenterology and Hepatology, University Hospital Basel, Petersgraben 4, 4031 Basel, Switzerland. markus.heim@unibas.ch

Journal of Hepatology
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Hepatitis C virus (HCV) evades the innate immune system, but early T cell responses can clear the infection. Later, ineffective interferon responses occur, with IL28B gene variations impacting outcomes.

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Last Updated: May 17, 2026

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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

Area of Science:

  • Hepatology
  • Immunology
  • Virology

Background:

  • Hepatitis C virus (HCV) chronic infections can lead to cirrhosis and cancer.
  • The innate immune system plays a crucial role in host-HCV interactions.
  • HCV NS3/4A protease inactivates key signaling molecules, hindering interferon induction.

Purpose of the Study:

  • To review the complex interactions between HCV and the innate immune system.
  • To explore viral evasion mechanisms and host immune responses.
  • To highlight the role of genetic variations in HCV clearance and treatment response.

Main Methods:

  • Review of existing literature on HCV immunology and virology.
  • Analysis of host-pathogen interactions, including viral evasion strategies.
  • Examination of the role of interferons (IFNs) and T cell responses.

Main Results:

  • HCV effectively inhibits early interferon production via protease activity.
  • Despite viral evasion, initial innate and later T cell responses occur.
  • Chronic infection involves ineffective interferon-stimulated gene expression and poor treatment response.
  • Genetic variations near IL28B are linked to spontaneous clearance and treatment success.

Conclusions:

  • The innate immune system mounts complex responses to HCV, often overcome by viral mechanisms.
  • Understanding these interactions is key to developing effective therapies.
  • IL28B genetic variants underscore the importance of innate immunity in HCV pathogenesis.