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  • Title: Mechanisms of antiprostate cancer by gum mastic: NF-kappaB signal as target.
    Author: He ML, Li A, Xu CS, Wang SL, Zhang MJ, Gu H, Yang YQ, Tao HH.
    Journal: Acta Pharmacol Sin; 2007 Mar; 28(3):446-52. PubMed ID: 17303010.
    Abstract:
    AIM: To study the effect of gum mastic, a natural resin, on the proliferation of androgen-independent prostate cancer PC-3 cells, and further investigate the mechanisms involved in this regulatory system, taking nuclear factor kappaB (NF-kappaB) signal as the target. METHODS: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and a flow cytometer were used to detect the effect of gum mastic on the proliferation of PC-3 cells. Then, reporter gene assay, RT-PCR, and Western blotting were carried out to study the effects of gum mastic on the NF-kappaB protein level and the NF-kappaB signal pathway. The expression of genes involved in the NF-kappaB signal pathway, including cyclin D1, inhibitors of kappaBs (I kappaB alpha), and phosphorylated Akt (p-AKT), were measured. In addition, transient transfection assays with the 5X NF-kappaB consensus sequence promoter was also used to test the effects of gum mastic. RESULTS: Gum mastic inhibited PC-3 cell growth and blocked the PC-3 cell cycle in the G1 phase. Gum mastic also suppressed NF-kappaB activity in the PC-3 cells. The expression of cyclin D1, a crucial cell cycle regulator and an NF-kappaB downstream target gene, was reduced as well. Moreover, gum mastic decreased the p-AKT protein level and increased the I kappa B alpha protein level. CONCLUSION: Gum mastic inhibited the proliferation and blocked the cell cycle progression in PC-3 cells by suppressing NF-kappaB activity and the NF-kappaB signal pathway.
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