Antiproliferative Activity of Rhinacanthus nasutus (L.) KURZ Extracts and the Active Moiety, Rhinacanthin C
作者:Akinobu Gotoh、Toshiyuki Sakaeda、Takashi Kimura、Toshiro Shirakawa、Yoshitaka Wada、Atsushi Wada、Tetsutaro Kimachi、Yoshiji Takemoto、Akira Iida、Seigo Iwakawa、Midori Hirai、Hisako Tomita、Noboru Okamura、Tsutomu Nakamura、Katsuhiko Okumura
DOI:10.1248/bpb.27.1070
日期:——
Rhinacanthus nasutus (L.) KURZ (Acanthaceae) is a shrub widely distributed in South China and India. In this study, the antiproliferative activity of the ethanol extract of root and aqueous extract of leaves of R. nasutus, and the supposed active moiety rhinacanthin C was assessed in vitro using the human cervical carcinoma cell line HeLa, its MDR1-overexpressing subline Hvr100-6, human prostate carcinoma PC-3 cells and human bladder carcinoma T24 cells. Rhinacanthin C was chemically synthesized and its content in the R. nasutus extracts was determined by HPLC with a photodiode array detector. The antiproliferative activity of the R. nasutus extracts was also assessed in vivo using sarcoma 180-bearing mice. It was suggested that 1) the in vitro antiproliferative activity of rhinacanthin C was comparable with or slightly weaker than that of 5-FU, 2) rhinacanthin C showed antiproliferative activity for MDR1-overexpressing Hvr100-6 cells, similarly to parent HeLa cells, 3) the in vitro antiproliferative activity of the ethanol extract of root R. nasutus was due to rhinacanthin C, whereas that of the aqueous extract of leaves of R. nasutus was due to constituents other than rhinacanthin C, and 4) both of the R. nasutus extracts showed in vivo antiproliferative activity after oral administration once daily for 14 d.
Rhinacanthus nasutus (L.) KURZ (爵床科) 是一种广泛分布于中国南方和印度的灌木。在本研究中,评估了R. nasutus的根乙醇提取物和叶子水提取物的抗增殖活性,以及被认为是活性成分的锥叶龙葵素C,使用人类宫颈癌细胞系HeLa、其MDR1过表达亚系Hvr100-6、人类前列腺癌PC-3细胞和人类膀胱癌T24细胞进行体外测试。锥叶龙葵素C经过化学合成,其在R. nasutus提取物中的含量通过高效液相色谱(HPLC)结合光二极管阵列检测器进行测定。还使用带有肉瘤180的鼠进行体内抗增殖活性评估。研究结果表明:1)锥叶龙葵素C的体外抗增殖活性与5-FU相当或稍弱;2)锥叶龙葵素C对MDR1过表达的Hvr100-6细胞显示出抗增殖活性,与母细胞HeLa细胞相似;3)R. nasutus根的乙醇提取物的体外抗增殖活性归因于锥叶龙葵素C,而R. nasutus叶子的水提取物的抗增殖活性则归因于除锥叶龙葵素C以外的成分;4)两种R. nasutus提取物在口服给药后,经过14天的每日一次给药后,均表现出体内抗增殖活性。