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Related Concept Videos

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...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Antimicrobial Proteins01:23

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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.

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Related Experiment Video

Updated: May 8, 2026

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes
10:00

High-throughput Quantitative Real-time RT-PCR Assay for Determining Expression Profiles of Types I and III Interferon Subtypes

Published on: March 24, 2015

Interferon induction and function at the mucosal surface.

Russell K Durbin1, Sergei V Kotenko, Joan E Durbin

  • 1Department of Pathology, New York University School of Medicine, New York, NY 10016, USA.

Immunological Reviews
|August 17, 2013
PubMed
Summary
This summary is machine-generated.

Type I and type III interferons (IFNs) fight viral infections. This review highlights their distinct roles in mucosal immunity against respiratory and gastrointestinal viruses, like influenza.

Keywords:
IFN inductionStat signalinginfluenza A virusinterferonrespiratory syncytial virusrotavirus

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Experimental Infection with Listeria monocytogenes as a Model for Studying Host Interferon-γ Responses

Published on: November 16, 2016

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Interferons (IFNs) are crucial cytokines induced by viral infections, establishing cellular antiviral states.
  • Type I (IFN-α/β) and type III (IFN-λ) IFNs activate similar antiviral pathways through distinct receptors.
  • Both IFN types utilize the same transcription factor, IFN-stimulated gene factor 3, for signaling.

Purpose of the Study:

  • To review the emerging literature on the differing roles of type I and type III IFNs.
  • To focus on host defense at mucosal surfaces against specific viral pathogens.
  • To elucidate the distinct induction and action mechanisms of these cytokine families.

Main Methods:

  • Literature review of existing studies on type I and type III IFNs.
  • Analysis of host defense mechanisms at mucosal barriers.
  • Focus on viral pathogens including influenza A virus, respiratory syncytial virus, and rotavirus.

Main Results:

  • Type I and type III IFNs, while sharing signaling pathways, exhibit distinct roles in host defense.
  • Differences in induction and receptor usage contribute to their varied functions.
  • IFN-λ plays a significant role in mucosal immunity, particularly in epithelial cells.

Conclusions:

  • Type I and type III IFNs have specialized functions in antiviral immunity, especially at mucosal surfaces.
  • Understanding these differences is key to developing effective antiviral strategies.
  • Further research is needed to fully delineate the therapeutic potential of targeting these distinct IFN pathways.