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Related Concept Videos

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.
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Induction of an Inflammatory Response in Primary Hepatocyte Cultures from Mice
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Published on: March 10, 2017

Hepatic interleukin-7 expression regulates T cell responses.

Yukihisa Sawa1, Yasunobu Arima, Hideki Ogura

  • 1Laboratory of Developmental Immunology, Graduate School of Frontier Biosciences, Graduate School of Medicine, Osaka University, Osaka 565-0871, Japan.

Immunity
|March 17, 2009
PubMed
Summary
This summary is machine-generated.

Hepatocytes produce Interleukin-7 (IL-7) in response to Toll-like receptor (TLR) signaling, directly controlling T cell responses. This discovery offers new targets for vaccine development and autoimmune disease therapies.

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Area of Science:

  • Immunology
  • Hepatology
  • Molecular Biology

Background:

  • Toll-like receptor (TLR) signaling influences systemic cytokine activity and hepatic protein expression during infection.
  • Interleukin-7 (IL-7) production was previously assumed to be constant in vivo.

Purpose of the Study:

  • To investigate the role of hepatic Interleukin-7 (IL-7) in regulating T cell responses.
  • To determine if IL-7 production is influenced by Toll-like receptor (TLR) signaling in the liver.

Main Methods:

  • Depletion of IL-7 expression in the liver.
  • Analysis of T cell populations (CD4+ and CD8+ T cells) and their functions.
  • Assessment of experimental autoimmune encephalitis development.

Main Results:

  • Hepatocyte-derived IL-7 directly controls T cell responses in vivo.
  • Depletion of hepatic IL-7 abrogated TLR-mediated T cell survival, CD8+ cytotoxic activity, and experimental autoimmune encephalitis.
  • TLR signaling induces IL-7 expression in the liver as an acute-phase response.

Conclusions:

  • Hepatocyte-derived IL-7 is a key regulator of T cell immunity, influenced by TLR signaling.
  • TLR-induced hepatic IL-7 represents a potential diagnostic and therapeutic target for vaccines and T cell dysregulation disorders.