New lignans and cytotoxic constituents from Schisandra propinqua.
The CHCl (3) extract from the stems of Schisandra propinqua (Wall.) Baill exhibited significant cytotoxic activity against cancer cell lines. Subsequent fractionation procedures led to the isolation of four new dibenzocyclooctadiene lignans, propinquanins A - D, along with two known lignans, schisantherin I and heteroclitin A, and three known triterpenoids, isoschisandrolic acid, schisandrolic acid and schisandronic acid. Their structures, including absolute stereochemistry, were elucidated through analyses of NMR data and CD spectra. The isolated compounds were tested for their cytotoxic activity in several tumor cell lines with the MTT assay. Propinquanin B ( 2) was significantly cytotoxic (IC (50) values < 10 microM) in HL-60 and Hep-G2 tumor cell lines. Cell cycle analysis and Hoechst 33 258 staining assay suggested that one possible mechanism of cytotoxic activity by 2 might be related to the induction of apoptosis.
Institute of Medicinal Plant Development, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, P. R. China.
Li-Jia
LJ
Xu
Feng
F
Huang
Si-Bao
SB
Chen
Qiao-Xia
QX
Zhang
Liang-Niang
LN
Li
Shi-Lin
SL
Chen
Pei-Gen
PG
Xiao
D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity*; D017209:Apoptosis; D045744:Cell Line, Tumor; D003603:Cytotoxins / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity; D006801:Humans; D017705:Lignans / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity*; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity; D018547:Plant Stems / Q000737:chemistry; D032141:Schisandra / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity
D000972:Antineoplastic Agents, Phytogenic; D003603:Cytotoxins; D017705:Lignans; D010936:Plant Extracts; D014315:Triterpenes