부산대학교 도서관

In this study, some depsidones and diaryl ether derivatives isolated from Corynespora cassicola, a fungi endophyte of Gongronema latifolium, were assessed for their anti-inflammatory potentials. The isolated metabolites corynesidone A ( 1), corynesidone C ( 2), corynesidone D ( 3) and corynether A ( 4) were screened for their effects on tumour necrosis factor-α (TNF-α), inducible nitric oxide (iNO), and reactive oxygen species (ROS) and reactive nitrogen species (RNS) production by stimulated RAW264.7 macrophages. Concentration of 1, 2, 3 and 4 up to 100 μM did not remarkably affect the viability of treated macrophages. The compounds were found to cause a concentration-dependent decrease in lipopolysaccharide-induced TNF-α and iNO in RAW264.7 cells. Pre-treatment with 100 μM of 1, 2, 3 and 4 suppressed iNO by as much as 96.28%, 95.71%, 78.14% and 73.28%; with IC50 of 8.16, 9.49, 15.29 and 26.52 μM, respectively. Similarly, pre-treatment with 100 μM of 1, 2, 3 and 4 caused an inhibition of 99.17%, 99.59%, 95.02% and 74.07% in the formation of iNO production, respectively, with IC50 of 1.88, 3.99, 7.48 and 37.22 μM. Treatment of with compounds 1-4 (10, 30 and 100 µM) followed by stimulation with phorbol 12-myristate 13-acetate (1 µM) caused significant ( p < 0.05) suppression of ROS/RNS-evoked chemiluminescence of luminol by as much as 100.96 ± 1.88%, 98.59 ± 1.38%, 87.35 ± 1.41% and 79.22 ± 0.30%, respectively at 100 µM. The depsidone derivatives ( 1- 4) showed more potent inhibition of TNF-α and NO production and better scavenging ROS/RNS than the diaryl ether derivative ( 4). These chemical scaffolds can serve as suitable lead molecules for further development into novel anti-inflammatory and/or anti-cancer agents. [ABSTRACT FROM AUTHOR]