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Methotrexate suppresses NF-kappaB activation through inhibition of IkappaBalpha phosphorylation and degradation

S Majumdar1, B B Aggarwal

  • 1Cytokine Research Laboratory, Department of Bioimmunotherapy, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|August 18, 2001
PubMed

Insights

Methotrexate (MTX) suppresses NF-kappaB activation, a key inflammatory pathway. This effect is mediated by the release of adenosine, contributing to MTX's anti-inflammatory and antiproliferative actions.

Area of Science:

  • Immunology
  • Pharmacology
  • Molecular Biology

Background:

  • Methotrexate (MTX) is an anti-inflammatory and immunosuppressive drug with an incompletely understood mechanism.
  • Nuclear factor-kappa B (NF-kappaB) plays a central role in inflammatory responses.

Purpose of the Study:

  • To investigate the effects of MTX on NF-kappaB activation.
  • To elucidate the molecular mechanisms underlying MTX's anti-inflammatory properties.

Main Methods:

  • Jurkat cells were treated with MTX and stimulated with TNF to assess NF-kappaB activation.
  • Key signaling molecules in the NF-kappaB pathway, including IkappaBalpha, were analyzed.
  • The role of adenosine signaling was examined using specific inhibitors and receptor antagonists.

Main Results:

  • MTX suppressed TNF-induced NF-kappaB activation in a dose- and time-dependent manner.
  • MTX inhibited IkappaBalpha degradation and phosphorylation, and abrogation of IkappaBalpha kinase activation.
  • Adenosine mimicked MTX effects, and adenosine A2b receptor antagonists reversed MTX-induced suppression, suggesting adenosine release is crucial.

Conclusions:

  • MTX suppresses NF-kappaB activation primarily through the release of adenosine.
  • This adenosine-mediated suppression of NF-kappaB contributes to MTX's anti-inflammatory, immunomodulatory, and antiproliferative effects.
  • The thymidylate synthase pathway may also play a partial role in MTX's mechanism of action.

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