Pseudolaric acid B-induced apoptosis through p53-dependent pathway in human gastric carcinoma cells
Pseudolaric acid B (PLAB, 1), a natural diterpenoid compound, was isolated from Pseudolarix kaempferi Gordon. It has shown antifungal, antifertility, and antiangiogenic properties in previous studies. Recently, increasing evidence has confirmed that 1 exhibits antitumor effects in several tumor cell lines, but the underlying mechanism has not been fully elucidated. The aim of this study was to investigate the mechanism of PLAB-induced cell apoptosis in MGC803 cells. The results showed that 1 significantly inhibited the proliferation of MGC803 cells at 0.01-10 M and the IC50 value was 0.91 M for 48 h. PLAB-induced apoptosis in MGC803 cells was confirmed by DNA fragmentation assay and Hoechst33342/PI staining. PLAB-treated MGC803 cells were arrested at G2 phase, which was associated with a marked increment of the expression of cyclin-dependent kinase inhibitor p21. The induction of p21 appeared to be transcriptionally up-regulated and was p53-dependent. In addition, PLAB induced Fas/APO-1 and caspase-3 expressions that were also correlated with apoptosis. Meanwhile, 1 decreased the mRNA expression of bcl-2, which is an antiapoptosis factor. In conclusion, 1 induced apoptosis through p53-dependent pathway in human gastric carcinoma cells. These findings suggest that 1 may be a novel promising agent for treating human gastric carcinoma.
Keywords: Fas; apoptosis; bcl-2; caspase-3; p53; pseudolaric acid B
Document Type: Research Article
Affiliations: 1: Department of Biochemistry, Hebei Medical University, Shijiazhuang, China,Affiliated Hospital, North China Coal Medical College, Tangshan, China 2: Department of Biochemistry, Hebei Medical University, Shijiazhuang, China
Publication date: 01 February 2009
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