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Mycophenolic acid differentially affects dendritic cell maturation induced by tumor necrosis factor-alpha and

Delphine Faugaret1, Roxane Lemoine, Christophe Baron

  • 1EA 4245 Cellules Dendritiques, Immunomodulation et Greffes, Université François Rabelais, IFR-136 Agents Transmissibles et Infectiologie, UFR de Médecine, 10 Bd Tonnellé, 37000 Tours, France.

Molecular Immunology
|March 26, 2010
PubMed

Insights

Mycophenolic acid (MPA) inhibits human dendritic cell (DC) maturation by blocking p38 MAPK, particularly affecting TNFalpha-induced maturation. Guanosine partially reverses MPA’s effects on DC phenotype and cytokine secretion.

Area of Science:

  • Immunology
  • Cell Biology
  • Pharmacology

Background:

  • Mycophenolic acid (MPA) is an immunosuppressive drug impacting dendritic cell (DC) function.
  • The mechanisms by which MPA affects DC maturation signals are not fully understood.
  • Mitogen-activated protein kinases (MAPK) play a role in DC maturation.

Purpose of the Study:

  • To investigate the effect of MPA on p38 MAPK and ERK1/2 signaling in human DCs.
  • To determine how MPA influences TNFalpha- and LPS-induced DC maturation.
  • To elucidate the specific pathways targeted by MPA in DCs.

Main Methods:

  • Human DCs were treated with MPA and stimulated with TNFalpha or LPS.
  • Phenotype maturation, cytokine synthesis, and allostimulatory capacity were assessed.
  • MAPK phosphorylation (p38MAPK, ERK1/2) and NF-kappaB activation were analyzed.
  • The effect of exogenous guanosine on MPA-treated DCs was evaluated.

Main Results:

  • MPA reduced TNFalpha-induced DC phenotype maturation but not LPS-induced maturation.
  • TNFalpha primarily utilized p38MAPK for maturation, while LPS activated NF-kappaB.
  • MPA significantly inhibited TNFalpha-induced p38MAPK phosphorylation more than LPS-induced.
  • MPA suppressed inflammatory cytokine synthesis and allostimulatory capacity for both stimuli.
  • Exogenous guanosine partially reversed MPA's effects on DC phenotype and cytokine secretion (IL-12p70, IFN-gamma) without altering p38MAPK phosphorylation.

Conclusions:

  • MPA's inhibition of p38MAPK phosphorylation is the primary mechanism for its effect on human DC phenotype maturation.
  • MPA's differential impact on TNFalpha versus LPS responses highlights the influence of the DC microenvironment on drug sensitivity.
  • MPA affects both DC phenotype and function, with guanosine offering partial counteraction to specific effects.

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