Anti-Inflammatory and Anti-Oxidative Effects of luteolin-7-<i>O</i>-glucuronide in LPS-Stimulated Murine Macrophages through TAK1 Inhibition and Nrf2 Activation

oleh: Young-Chang Cho, Jiyoung Park, Sayeon Cho

Format: Article
Diterbitkan: MDPI AG 2020-03-01

Deskripsi

Various herbal extracts containing luteolin-7-<i>O</i>-glucuronide (L7Gn) have been traditionally used to treat inflammatory diseases. However, systemic studies aimed at elucidating the anti-inflammatory and anti-oxidative mechanisms of L7Gn in macrophages are insufficient. Herein, the anti-inflammatory and anti-oxidative effects of L7Gn and their underlying mechanisms of action in macrophages were explored. L7Gn inhibited nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages by transcriptional regulation of inducible NO synthase (<i>iNOS</i>) in a dose-dependent manner. The mRNA expression of inflammatory mediators, including cyclooxygenase-2 (<i>COX-2</i>), interleukin-6 (<i>IL-6</i>), <i>IL-1&#946;</i>, and tumor necrosis factor-&#945; (<i>TNF-&#945;</i>), was inhibited by L7Gn treatment. This suppression was mediated through transforming growth factor beta-activated kinase 1 (TAK1) inhibition that leads to reduced activation of nuclear factor-&#954;B (NF-&#954;B), p38, and c-Jun N-terminal kinase (JNK). L7Gn also enhanced the radical scavenging effect and increased the expression of anti-oxidative regulators, including heme oxygenase-1 (HO-1), glutamate-cysteine ligase catalytic subunit (GCLC), and NAD(P)H quinone oxidoreductase 1 (NQO1), by nuclear factor-erythroid 2 p45-related factor 2 (Nrf2) activation. These results indicate that L7Gn exhibits anti-inflammatory and anti-oxidative properties in LPS-stimulated murine macrophages, suggesting that L7Gn may be a suitable candidate to treat severe inflammation and oxidative stress.