Mycophenolic acid inhibits inosine 5'-monophosphate dehydrogenase and suppresses production of pro-inflammatory cytokines, nitric oxide, and LDH in macrophages
- PMID: 12381354
- DOI: 10.1016/s0008-8749(02)00502-6
Mycophenolic acid inhibits inosine 5'-monophosphate dehydrogenase and suppresses production of pro-inflammatory cytokines, nitric oxide, and LDH in macrophages
Abstract
Mycophenolic acid (MPA) inhibits reversibly inosine 5(')-monophosphate dehydrogenase, an enzyme involved in the de novo synthesis of guanine nucleotides. Previously, mycophenolate mofetil (MMF), the pro-drug of MPA, was shown to exert beneficial effects on the systemic lupus erythematosus (SLE)-like disease in MRLlpr/lpr mice. In this study MPA's immunomodulating effects in vitro on the murine macrophage cell line IC-21 were investigated. The cells were exposed to MPA together with lipopolysaccharide and IFN-gamma. Cytokine, NO(2)(-), and lactate dehydrogenase levels in supernatants and cell lysates were analysed as well as the proliferation of IC-21 cells. MPA exposure reduced the total levels of all molecules investigated and suppressed the proliferation. All MPA-induced effects were reversed by the addition of guanosine to the cultures. Since macrophages play a role in lupus nephritis, our results indicate that modulation of macrophages may be involved in the ameliorating effects of MMF in SLE.
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