Abstract
In this study, limonoids isolated from Xylocarpus plants were tested for their in vitro anti-inflammatory effects. The results demonstrated that only 7-deacetylgedunin (1), a gedunin-type limonoid, significantly inhibited lipopolysaccharide- and interferon-γ-stimulated production of nitric oxide in murine macrophage RAW 264.7 cells. The suppression
of nitric oxide production by 1 was correlated with the downregulation of mRNA and protein expression of inducible
nitric oxide synthase. Mechanistic studies revealed that the transcriptional activity
of nuclear factor-κB, IκBα degradation, and the activation of mitogen-activated protein kinases, stimulated
with lipopolysaccharide and interferon-γ, were suppressed by 1.
Key words
gedunin - limonoid - anti-inflammatory effect - nitric oxide - iNOS