Abstract:
BACKGROUND:Methyl protodioscin (MPD) is a furostanol bisglycoside with antitumor properties. It has been shown to reduce proliferation, cause cell cycle arrest. OBJECTIVE:The present study elucidates the mechanism underlying MPD's apoptotic effects, using the A549 human lung cancer cell line. MATERIALS AND METHODS:The human pulmonary adenocarcinoma cell line A549 was obtained from the Cell Bank of the Animal Experiment Center, North School Region, Sun Yat-Sen University. All of the cells were grown in RPMI 1640 supplemented with 10% fetal calf serum (Hyclone, Logan, UT, USA), penicillin (10,000 U/l), and streptomycin (100 mg/l) at 37°C in a 5% CO2 humidified atmosphere. The induction of apoptosis was observed in flow cytometry and fluorescent staining experiments. RESULTS:MPD showed growth inhibitory effects in A549 cells in a dose- and time-dependent manner. The significant G2/M cell cycle arrest and apoptotic effect were also seen in A549 cells treated with MPD. MPD-induced apoptosis was accompanied by a significant reduction of mitochondrial membrane potential, release of mitochondrial cytochrome c to cytosol, activation of caspase-3, downregulation of Bcl-2, p-Bad, and upregulation of Bax. CONCLUSION:Our results show that the induction of apoptosis by MPD involves multiple molecular pathways and strongly suggest that Bcl-2 family proteins signaling pathways. In addition, mitochondrial membrane potential, mitochondrial cytochrome c and caspase-3 were also closely associated with MPD-induced apoptotic process in human A549 cells.
journal_name
Pharmacogn Magjournal_title
Pharmacognosy magazineauthors
Bai Y,Qu XY,Yin JQ,Wu L,Jiang H,Long HW,Jia Qdoi
10.4103/0973-1296.137373subject
Has Abstractpub_date
2014-07-01 00:00:00pages
318-24issue
39eissn
0973-1296issn
0976-4062pii
PM-10-318journal_volume
10pub_type
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