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International Journal Of Bilogical Sciences

.: Home > International Journal Of Bilogical Sciences > 2012 > Volume 8 Number 3 > Zhaocai Li#, Xingang Xu#, Yong Huang, Li Ding, Zhisheng Wang, Gaoshui Yu, Dan Xu, Wei Li, Dewen Tong✉

Swainsonine Activates Mitochondria-mediated Apoptotic Pathway in Human Lung Cancer A549 Cells and Retards the Growth of Lung Cancer Xenografts

Zhaocai Li#, Xingang Xu#, Yong Huang, Li Ding, Zhisheng Wang, Gaoshui Yu, Dan Xu, Wei Li, Dewen Tong✉
College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, P.R. China
Abstract :

Swainsonine (1, 2, 8-trihyroxyindolizidine, SW), a natural alkaloid, has been reported to exhibit anti-cancer activity on several mouse models of human cancer and human cancers in vivo. However, the mechanisms of SW-mediated tumor regression are not clear. In this study, we investigated the effects of SW on several human lung cancer cell lines in vitro. The results showed that SW significantly inhibited these cells growth through induction of apoptosis in different extent in vitro. Further studies showed that SW treatment up-regulated Bax, down-regulated Bcl-2 expression, promoted Bax translocation to mitochondria, activated mitochondria-mediated apoptotic pathway, which in turn caused the release of cytochrome c, the activation of caspase-9 and caspase-3, and the cleavage of poly (ADP-ribose) polymerase (PARP), resulting in A549 cell apoptosis. However, the expression of Fas, Fas ligand (FasL) or caspase-8 activity did not appear significant changes in the process of SW-induced apoptosis. Moreover, SW treatment inhibited Bcl-2 expression, promoted Bax translocation, cytochrome c release and caspase-3 activity in xenograft tumor cells, resulting in a significant decrease of tumor volume and tumor weight in the SW-treated xenograft mice groups in comparison to the control group. Taken together, this study demonstrated for the first time that SW inhibited A549 cancer cells growth through a mitochondria-mediated, caspase-dependent apoptotic pathway in vitro and in vivo.

Keywords :
swainsonine, apoptosis, caspase, mitochondrial pathway, A549 cells

Date Deposited : 09 Apr 2015 10:54

Last Modified : 09 Apr 2015 10:54

Official URL: http://www.ijbs.com/ms/archive

Volume 8, Number 3, - 2012 , ISSN 1545-1003

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