Abstract:
:We recently established that NCPMF-60, a newly synthesized flavonoid, is an active cytotoxic component. The molecular mechanisms by which NCPMF-60 exerts its cytotoxic activity are currently unknown. In this study, we show that NCPMF-60 induces G2/M phase arrest and apoptosis in human hepatocellular carcinoma HepG2 cells. After treatment of HepG2 cells with NCPMF-60, cell cycle-related proteins, such as cyclin B1, cyclin H, CDK7, and p-CDK1 (Thr161), were downregulated, whereas p21 and p-CDK1 (Thr14/Tyr15) were upregulated. The activity of CDK1/cyclinB complex was also inhibited by NCPMF-60. In addition, we observed poly(ADP-ribose) polymerase cleavage and activation of caspase 3 and caspase 9. The expression ratio of Bax/Bcl-2 was increased in the treated cells, in which Bax was also upregulated. We also found that the expression of p53 and its phosphorylation at Ser15 accumulated after the treatment of NCPMF-60. Moreover, upregulation of p21, p53-upregulated modifier of apoptosis, and Bax, three p53-target gene products, and the downregulation of Bcl-2 and MDM2, were observed in NCPMF-60-treated cells. However, p53 is not the only regulator in the stimulation of NCPMF-60 on p21 transcriptional level and posttranscriptional level. These results suggested that NCPMF-60 indeed activated the p53 pathway, which may contribute to its induction of cell cycle arrest and apoptosis in HepG2 cells. Collectively, our findings show that cell cycle arrest and apoptosis induced by NCPMF-60 was associated with the activation of p53 pathway and the inhibition of CDK-activating kinase activity in HepG2 cells.
journal_name
Anticancer Drugsjournal_title
Anti-cancer drugsauthors
Dai QS,Liu W,Wang XB,Lu N,Gong DD,Kong LY,Guo QLdoi
10.1097/CAD.0b013e3283405801subject
Has Abstractpub_date
2011-01-01 00:00:00pages
46-57issue
1eissn
0959-4973issn
1473-5741journal_volume
22pub_type
杂志文章abstract::Organotypic cultures of human A549 cells were used as a tumor model to investigate sequence effects for combination treatments with adriamycin (ADR) and X-irradiation. Initial drug exposure led to the greatest cytotoxic effect especially when X-rays were delivered 24 h later and this subsequent irradiation did not sig...
journal_title:Anti-cancer drugs
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