Phloroglucinols Inhibit Chemical Mediators and Xanthine Oxidase, and Protect Cisplatin-lnduced Cell Death by Reducing Reactive Oxygen Species in Normal Human Urothelial and Bladder Cancer Cells

摘要

Phloroglucinols, garcinielliptones HA-HE (1 -5), and C (6) were studied in vitro for their inhibitory effects on chemical mediators released from mast cells, neutrophils, and macrophages. Compound 6 revealed significant inhibitory effect on release of lysozyme from rat neutrophils stimulated with formyl-Met-Leu-Phe (fMLP)/cytochalasin- B (CB). Compounds 3, 4, and 6 showed significant inhibitory effects on superoxide anion generation in rat neutrophils stimulated with (fMLP)/(CB), while compounds 1 and S revealed inhibitory effects on tumor necrosis factor-α (TNF-α) formation in macrophages stimulated with lipopolysaocharide (LPS). Compounds 1 and 3-6 showed inhibitory effects on xanthine oxidase (XO) and could inhibit the DNA breakage caused by O_2~(-·). Treatment of NTUB1 with 2 to 60 μM compound 3 and 5 μM cisplatin and SV-HUC1 with 9 to 60 μM 3 and 5 μM cisplatin, respectively, resulted in an increase of viability of cells. These results indicated that compounds 1 and 3-6 showed anti-inflammatory effects and antioxidant activities. Compound 3 mediates through the suppression of XO activity and reduction of reactive oxygen species (ROS), and protection of subsequent cell death.