Extracts from the roots of Lindera strychifolia induces apoptosis in lung cancer cells and prolongs survival of tumor-bearing mice.
Lindera strychifolia, a scandent shrub Lauraceous medicinal plant, has been used in Chinese traditional medicine as a palliative and an anti-spasmodic. It also shows cytotoxic effects against several tumor cell lines and inhibits marcromolecule biosynthesis. This study investigated the anti-tumor effects of L. strychifolia extract against lung cancer cells using in vitro and in vivo models. Two human lung cancer cell lines A549 (adenocarcinoma) and SBC-3 (small cell carcinoma), and a non-tumor cell line 3T3-L1 (mice fibroblasts) were subjected to L. strychifolia extract treatment. On lung cancer cells, L. strychifolia induced cell growth inhibition in a dose-dependent manner. Conversely, the extract did not show any significant cytotoxic effect on 3T3-L1 cells. Therefore, the extract is specific for tumor cells. Tumor cells treated with L. strychifolia extract showed typical morphological appearance of apoptosis including nuclei fragmentation and cell condensation. The in vivo effects of L. strychifolia extract were investigated in C57BL/6 mice transplanted with Lewis lung cancer (LL-2) cells, and in BALB/c nude mice transplanted with A549 or SBC-3 human lung cancer cells. Oral administration of L. strychifolia extract prolonged survival time and inhibited tumor growth in a dose-dependent manner by inducing apoptosis in the LL-2 cell mice model. Furthermore, in A549 or SBC-3 cell nude mice models, oral administration of L. strychifolia extract also significantly inhibited tumor growth at the 5.0 mg/ml concentration. These findings suggested that the components of L. strychifolia have anticancer activity and may contribute to clinical applications in the prevention and treatment of lung cancer.
Li
Yun-Mo
YM
Second Department of Internal Medicine, Gifu University School of Medicine, 40 Tsukasa-machi, Gifu 500-8705, Japan.
Ohno
Yasushi
Y
Minatoguchi
Shinya
S
Fukuda
Kazunori
K
Ikoma
Tetsuro
T
Ohno
Takamasa
T
Akao
Seigo
S
Takemura
Genzou
G
Gotou
Koushi
K
Fujiwara
Hisayoshi
H
D041721:3T3-L1 Cells; D000230:Adenocarcinoma; D000284:Administration, Oral; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D018827:Carcinoma, Lewis Lung / Q000188:drug therapy* / Q000401:mortality; D018288:Carcinoma, Small Cell; D045744:Cell Line, Tumor / Q000737:chemistry / Q000166:cytology / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D006801:Humans; D020287:In Situ Nick-End Labeling; D027443:Lindera; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000401:mortality; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D008517:Phytotherapy; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D015996:Survival Rate
D004365:Drugs, Chinese Herbal; D018809:Proliferating Cell Nuclear Antigen