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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...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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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.
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...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
Antigen Presenting Cells01:22

Antigen Presenting Cells

The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...

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Related Experiment Video

Updated: Jul 10, 2026

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood
07:35

Generation of Human Monocyte-derived Dendritic Cells from Whole Blood

Published on: December 24, 2016

The current immune function of hepatic dendritic cells.

Willy Hsu1, Shang-An Shu, Eric Gershwin

  • 1Division of Rheumatology, Allergy and Clinical Immunology, University of California at Davis School of Medicine, Davis, CA 95616, USA.

Cellular & Molecular Immunology
|November 3, 2007
PubMed
Summary

Liver dendritic cells (DCs) are crucial for immune regulation, despite their low numbers. These cells exhibit enhanced innate immunity and cytokine secretion, balancing tolerance with pathogen defense to prevent inflammation and disease.

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Area of Science:

  • Immunology
  • Hepatology
  • Cell Biology

Background:

  • Dendritic cells (DCs) are key regulators of liver immunity, despite comprising a small fraction of liver cells.
  • Four main subsets of hepatic DCs exist: myeloid, lymphoid, plasmacytoid, and natural killer DCs, each with distinct phenotypes.
  • Hepatic DCs are generally poor stimulators of naive T cells but possess enhanced innate immune functions.

Purpose of the Study:

  • To elucidate the role of hepatic dendritic cells in liver immunity and immune tolerance.
  • To understand the balance between innate immune responses and tolerogenic functions of hepatic DCs.
  • To explore the implications of hepatic DC characteristics in liver health and disease, including autoimmunity and malignancy.

Main Methods:

  • Phenotypic characterization of hepatic dendritic cell subsets (myeloid, lymphoid, plasmacytoid, NK DCs).
  • Assessment of T cell stimulatory capacity and cytokine secretion profiles following Toll-like receptor (TLR) stimulation.
  • Evaluation of phagocytic activity and immune tolerance mechanisms in hepatic DCs.

Main Results:

  • Hepatic DCs exhibit reduced allostimulatory capacity but enhanced cytokine secretion and phagocytosis upon TLR stimulation.
  • These properties position hepatic DCs as crucial components of the innate immune system in the liver.
  • Hepatic DCs maintain a tolerogenic state essential for managing high antigen exposure while activating memory T cells during secondary infections.

Conclusions:

  • Hepatic DCs play a vital role in balancing innate immunity and immune tolerance in the liver.
  • Their unique characteristics are critical for preventing chronic inflammation in response to dietary and commensal antigens.
  • Dysregulation of hepatic DC tolerogenic functions may contribute to liver autoimmunity and malignancies.