Purification, antitumor activity in vitro of steroidal glycoalkaloids from black nightshade (Solanum nigrum L.)

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• 作者：Xia Ding^a ; ^{dingxia@njau.edu.cn} ; Fangshi Zhu^b ; Yun Yang^a ; Min Li^a
• 关键词：Solanum nigrum L. ; Steroidal glycoalkaloids ; Antitumor activity ; Structure&ndash ; activity relationship ; MGC-803 human gastric carcinoma cell ; Apoptosis
• 刊名：Food Chemistry
• 出版年：2013
• 出版时间：15 November, 2013
• 年：2013
• 卷：141
• 期：2
• 页码：1181-1186
• 全文大小：953 K

文摘

Six steroidal glycoalkaloids (1-6) were isolated and purified from Solanum nigrum L. (SNL) by acid extraction and alkaline precipitation, various chromatographic techniques, and their structures were elucidated by spectroscopic data. Antitumor activity, structure-activity and its molecular mechanism were investigated by methyl thiazolyl tetrazolium (MTT) method, flow cytometry, colorimetric assay and an immunocytochemical method. Experimental results showed that compounds 1 (solasonine), 2 (¦Â1-solasonine), 3 (solamargine) and 6 (solanigroside P) have cytotoxicity to MGC-803 cells. Compounds with three sugar units and a-l-rhamnopyranose at C-2 or a hydroxyl group on the steroidal backbone may be potential candidates for the treatment of gastric cancer. The mechanism of action may be related to the decrease of mutation p53, the increase of the ratio of Bax to Bcl-2 and the activation of caspase-3 to induce apoptosis.