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TNF receptor-associated factor 6-dependent CD40 signaling primes macrophages to acquire antimicrobial activity in

Rosa M Andrade1, Matthew Wessendarp, Jose-Andres C Portillo

  • 1Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|October 21, 2005
PubMed

Insights

CD40 can prime macrophages for antimicrobial activity against pathogens, working with TNF-alpha even without IFN-gamma. This pathway involves TNFR-associated factor 6 and TNFR2, offering new insights into macrophage immune responses.

Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Interferon-gamma (IFN-gamma) typically activates macrophages against intracellular pathogens with Tumor Necrosis Factor-alpha (TNF-alpha).
  • Pathogen protection can occur without IFN-gamma, suggesting alternative activation pathways involving TNF-alpha.

Purpose of the Study:

  • To investigate if CD40 can substitute for IFN-gamma as a priming signal for macrophage antimicrobial activity.
  • To elucidate the molecular mechanisms by which CD40 influences TNF-alpha-mediated antimicrobial responses.

Main Methods:

  • Utilized mouse macrophages to assess antimicrobial activity.
  • Investigated the roles of CD40, TNF-alpha, IFN-gamma, IL-10, TGF-beta, TNFR, and TNFR-associated factor 6 (TRAF6) signaling.

Main Results:

  • CD40 successfully primes mouse macrophages to develop antimicrobial activity in response to TNF-alpha.
  • This CD40-mediated effect did not depend on altered IL-10/TGF-beta production or TNFR expression.
  • The induction of antimicrobial activity required the cooperation of TRAF6-dependent CD40 signaling and TNFR2.

Conclusions:

  • CD40 can serve as an alternative priming signal to IFN-gamma for inducing macrophage antimicrobial activity.
  • TRAF6 signaling downstream of CD40 modifies macrophage responses to TNF-alpha, leading to pathogen defense.
  • These findings expand the understanding of macrophage activation pathways in innate immunity.

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