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Related Experiment Videos

Decay-accelerating factor modulates induction of T cell immunity.

Peter S Heeger1, Peter N Lalli, Feng Lin

  • 1Department of Immunology, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.

The Journal of Experimental Medicine
|May 11, 2005
PubMed
Summary

Removing decay-accelerating factor (Daf) from immune cells boosts T cell activation and proliferation. This suggests complement system

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Area of Science:

  • Immunology
  • Complement System Biology

Background:

  • Decay-accelerating factor (Daf) prevents complement activation on host cells by dissociating C3/C5 convertases.
  • The role of the complement system, particularly the alternative pathway, in T cell immunity is not fully understood.

Purpose of the Study:

  • To investigate the impact of Daf absence on T cell activation and effector cell differentiation.
  • To elucidate the involvement of the alternative complement pathway in T cell-APC interactions.

Main Methods:

  • Utilized primary T cell activation models in the absence of Daf on antigen-presenting cells (APCs) and T cells.
  • Assessed T cell proliferation and effector cell frequency.
  • Investigated the dependency on Factor D and C5, key components of the alternative pathway.

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Main Results:

  • Absence of Daf on APCs and T cells significantly enhanced T cell proliferation and effector cell generation.
  • This enhancement was dependent on Factor D and C5, confirming the role of the alternative pathway.
  • T cell-APC interactions led to rapid production of alternative pathway components and decreased Daf expression.

Conclusions:

  • Local alternative pathway activation acts as a costimulator for T cell immunity.
  • Surface Daf protein functions as a negative modulator of T cell responses.
  • These findings provide a mechanistic link between complement activation and T cell function, with potential therapeutic implications.