Cytotoxic neo-clerodane diterpenoid alkaloids from Scutellaria barbata.
Six new neo-clerodane diterpenoid alkaloids, named scutehenanines A-D (1, 4, 5, 6), 6-O-acetylscutehenanine A (2), and 6-O-(2-carbonyl-3-methylbutanoyl)scutehenanine A (3), were isolated from the whole plant of Scutellaria barbata. Their structures were established on the basis of detailed physical data analyses. In vitro, the six new isolated compounds showed cytotoxic activities against three human cancer lines (HONE-1 nasopharyngeal, KB oral epidermoid carcinoma, and HT29 colorectal carcinoma cells) and gave IC50 values in the range 2.8-6.4 microM.
Dai
Sheng-Jun
SJ
School of Pharmaceutical Science, Yantai University, Yantai 264005, People's Republic of China. daishengjun_9@hotmail.com
Peng
Wei-Bing
WB
Zhang
De-Wu
DW
Shen
Li
L
Wang
Wen-Yan
WY
Ren
Yan
Y
D000470:Alkaloids / Q000737:chemistry / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D045785:Diterpenes, Clerodane / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D006801:Humans; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*; D031363:Scutellaria / Q000737:chemistry*
D000470:Alkaloids; D000972:Antineoplastic Agents, Phytogenic; D045785:Diterpenes, Clerodane; D004365:Drugs, Chinese Herbal