Bioactive Constituents from Chinese Natural Medicines. XI. Inhibitors on NO Production and Degranulation in RBL-2H3 from Rubia yunnanensis: Structures of Rubianosides II, III, and IV, Rubianol-g, and Rubianthraquinone
作者:Jing Tao、Toshio Morikawa、Shin Ando、Hisashi Matsuda、Masayuki Yoshikawa
DOI:10.1248/cpb.51.654
日期:——
Three new arborinane-type triterpene glycosides, rubianosides II, III, and IV, a new arborinane-type triterpene, rubianol-g, and a new anthraquinone, rubianthraquinone, were isolated from a Chinese natural medicine, the roots of Rubia yunnanensis. The structures of the new constituents including their absolute configurations were determined on the basis of chemical and physicochemical evidence. The inhibitory effects of the isolated constituents on nitric oxide production in lipopolysaccharide-activated macrophages were examined. Among them, a cyclic peptide constituent, RA-XII and its aglycon, RA-V (deoxybouvadin), potently inhibited overproduction of nitric oxide and induction of inducible nitric oxide synthase. In addition, an anthraquinone constituent, 2-methyl-1,3,6-trihydroxy-9,10-anthraquinone, was found to show inhibitory effects on the release of β-hexosaminidase in RBL-2H3 cells.
从云南紫铆的根中分离出三种新的紫铆烷型三萜糖苷(紫铆烷糖苷II、III和IV)、一种新的紫铆烷型三萜(紫铆醇-g)和一种新的蒽醌(紫铆蒽醌)。根据化学和物理化学证据确定了新成分的结构,包括其绝对构型。研究了分离出的成分对脂多糖激活的巨噬细胞中一氧化氮产生的抑制作用。其中,一种环肽成分RA-XII及其糖苷RA-V(脱氧布瓦丁)能够有效抑制一氧化氮的过量产生和诱导型一氧化氮合酶的诱导。此外,发现一种蒽醌成分2-甲基-1,3,6-三羟基-9,10-蒽醌对RBL-2H3细胞中β-己糖胺酶的释放具有抑制作用。