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B7h is required for T cell activation, differentiation, and effector function.

Roza I Nurieva1, Xoi Moui Mai, Katherine Forbush

  • 1Department of Immunology, University of Washington, Seattle, WA 98195-7650, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 15, 2003
PubMed
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B7h is crucial for T helper cell immune responses. Its deficiency impairs T cell activation, differentiation, and cytokine production, highlighting its essential role in adaptive immunity.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • T helper (Th) cell function is regulated by costimulatory molecules.
  • Inducible costimulator (ICOS) is a costimulatory receptor on activated T cells.
  • B7h is a ligand for ICOS found on antigen-presenting cells (APCs).

Purpose of the Study:

  • To investigate the genetic regulatory roles of B7h in T cell immune responses.
  • To analyze the function of B7h using B7h-deficient mice.
  • To confirm the ICOS-B7h interaction as the sole receptor-ligand pair.

Main Methods:

  • Generation and analysis of B7h-deficient mice.
  • Assessment of T helper cell proliferation and IL-2 production upon activation with B7h-deficient APCs.
  • Evaluation of Th2 cytokine production (IL-4, IL-13) and c-Maf expression in differentiated Th cells.

Related Experiment Videos

Main Results:

  • B7h-deficient APCs led to reduced Th cell proliferation and IL-2 production.
  • Th cell differentiation in the presence of B7h-/- APCs resulted in significantly lower IL-4 and IL-13 production.
  • The observed cytokine defect was linked to reduced c-Maf expression and could be rescued by c-Maf overexpression.
  • Effector T cells restimulated with B7h-deficient APCs showed diminished Th2 cytokine production.

Conclusions:

  • B7h is the sole ligand for ICOS, and ICOS is its sole receptor.
  • B7h is essential for proper T helper cell activation, differentiation, and effector cytokine expression.
  • B7h plays a critical role in regulating Th2 immune responses through c-Maf-dependent pathways.