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Related Concept Videos

Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
T Cell Activation and Clonal Selection01:22

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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Concept and Mechanism of Autoimmune Diseases
The immune system...

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Related Experiment Video

Updated: Jul 9, 2026

Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
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Published on: September 27, 2013

Biliary epithelial cells regulate autoreactive T cells: implications for biliary-specific diseases.

Takashi Kamihira1, Shinji Shimoda, Minoru Nakamura

  • 1Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan.

Hepatology (Baltimore, Md.)
|December 25, 2004
PubMed
Summary

Biliary epithelial cells (BECs) regulate T-cell activation through programmed death 1 ligands and prostaglandin E2, crucial for immune tolerance in liver diseases like primary biliary cirrhosis.

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Area of Science:

  • Immunology
  • Hepatology
  • Cell Biology

Background:

  • Biliary epithelial cells (BECs) are implicated in immune-mediated liver diseases, such as primary biliary cirrhosis.
  • BECs express human leukocyte antigen Class II, intercellular adhesion molecule-1, and lymphocyte function-associated antigen-3, but their precise role remains unclear.
  • The function of BECs as accessory or antigen-presenting cells in T-cell regulation is not fully elucidated.

Purpose of the Study:

  • To investigate the role of BECs in regulating T-cell activation.
  • To characterize the mechanisms by which BECs influence T-cell responses.
  • To explore the potential therapeutic implications of modulating BEC function.

Main Methods:

  • Established autoreactive T-cell clones from patients with primary biliary cirrhosis (human leukocyte antigen-DR53).
  • Characterized BEC function by assessing their ability to regulate T-cell activation.
  • Investigated cell-contact-dependent and independent mechanisms of T-cell regulation by BECs.

Main Results:

  • BECs mediate T-cell activation partially through programmed death 1 ligands in a cell-contact-dependent manner.
  • BECs also induce T-cell activation via prostaglandin E2 production, independent of cell contact.
  • Prostaglandin E2 production by BECs is partially regulated by interleukin-1beta and tumor necrosis factor alpha.

Conclusions:

  • BEC regulatory activities are vital for maintaining peripheral immune tolerance.
  • Modulating BEC function presents a potential therapeutic strategy for immune-mediated liver diseases.
  • Understanding BEC-mediated immune regulation offers insights into liver disease pathogenesis.