Abstract:(-)-Epigallocatechin-3-gallate (EGCG), a major polyphenol in green tea, was shown to have cancer chemopreventive activity. In this study, we examined the antimetastatic effects of EGCG or the combination of EGCG and dacarbazine on B16-F3m melanoma cells in vitro and in vivo. First, the antimetastatic potentials of five green tea catechins were examined by soft agar colony formation assay, and the results show that EGCG was more effective than the other catechins in inhibiting soft agar colony formation. Second… Show more
“…This implies that sulforaphane enhances the efficiency of gemcitabine against the cancer cells, especially at lower doses, thereby minimizing its cytotoxicity to normal cells resulting in better survival. Other studies have also reported a synergistic interaction between different treatment strategies (Liu et al, 2001;Kuhar et al, 2007;Kumi-Diaka et al, 2010;Wang et al, 2011). Other studies of concurrent curcumin and chemotherapeutic drugs such as cisplatin, doxorubicin, and taxol showed that curcumin enhances the antitumor activities of the latter in various cancer cells (Chan et al, 2003;Notarbartolo et al, 2005).…”
Phytochemicals are among the natural chemopreventive agents with most potential for delaying, blocking or reversing the initiation and promotional events of carcinogenesis. They therefore offer cancer treatment strategies to reduce cancer related death. One such promising chemopreventive agent which has attracted considerable attention is sulforaphane (SFN), which exhibits anti-cancer, anti-diabetic, and anti-microbial properties. The present study was undertaken to assess effect of SFN alone and in combination with a chemotherapeutic agent, gemcitabine, on the proliferative potential of MCF-7 cells by cell viability assay and authenticated the results by nuclear morphological examination.
“…This implies that sulforaphane enhances the efficiency of gemcitabine against the cancer cells, especially at lower doses, thereby minimizing its cytotoxicity to normal cells resulting in better survival. Other studies have also reported a synergistic interaction between different treatment strategies (Liu et al, 2001;Kuhar et al, 2007;Kumi-Diaka et al, 2010;Wang et al, 2011). Other studies of concurrent curcumin and chemotherapeutic drugs such as cisplatin, doxorubicin, and taxol showed that curcumin enhances the antitumor activities of the latter in various cancer cells (Chan et al, 2003;Notarbartolo et al, 2005).…”
Phytochemicals are among the natural chemopreventive agents with most potential for delaying, blocking or reversing the initiation and promotional events of carcinogenesis. They therefore offer cancer treatment strategies to reduce cancer related death. One such promising chemopreventive agent which has attracted considerable attention is sulforaphane (SFN), which exhibits anti-cancer, anti-diabetic, and anti-microbial properties. The present study was undertaken to assess effect of SFN alone and in combination with a chemotherapeutic agent, gemcitabine, on the proliferative potential of MCF-7 cells by cell viability assay and authenticated the results by nuclear morphological examination.
“…EGCG has also shown beneficial effects in lung cancer by decreasing the growth of the primary tumours and metastasis when mice were intraperitoneally (i.p.) injected with B16-F3m cells [37]; however, rats with breast cancer did not improve after receiving EGCG in the drinking water [26].…”
Section: Anticarcinogenic Activity Of Polyphenols In Animalsmentioning
Prevention of cancer through dietary intervention recently has received an increasing interest, and dietary polyphenols have become not only important potential chemopreventive, but also therapeutic, natural agents. Polyphenols have been reported to interfere at the initiation, promotion and progression of cancer. They might lead to the modulation of proteins in diverse pathways and require the integration of different signals for the final chemopreventive or therapeutic effect. Polyphenols have been demonstrated to act on multiple key elements in signal transduction pathways related to cellular proliferation, differentiation, apoptosis, inflammation, angiogenesis and metastasis; however, these molecular mechanisms of action are not completely characterized and many features remain to be elucidated. The aim of this review is to provide insights into the molecular basis of potential chemopreventive and therapeutic activities of dietary polyphenols with emphasis in their ability to control intracellular signalling cascades considered as relevant targets in a cancer preventive approach.
“…VEGF-induced signaling pathway activation is required for the biological outcomes of stimulated endothelial cell proliferation and tube formation. [10][11][12] IL-8 is a cytokine produced by a variety of cells types, including transformed and endothelial cells. In addition to being a chemotactic cytokine, IL-8 is a potent angiogenic factor in vivo and in vitro.…”
A potential mechanism by which green tea may prevent cancer development is through the inhibition of angiogenesis. We have shown previously that the green tea catechin, epigallocatechin gallate (EGCG), inhibits endothelial cell tube formation through the inhibition of vascular endothelial growth factor (VEGF)-induced Akt activation and vascular endothelial (VE)-cadherin phosphorylation. Furthermore, EGCG can suppress oxidant-induced production of the proangiogenic cytokine interleukin (IL)-8. To further elucidate the antiangiogenic mechanisms of EGCG, we investigated its regulation of other molecular processes in VEGFinduced signaling in human umbilical vein endothelial cells (HUVECs). We show that EGCG at physiological doses (0.5-10 lM) markedly inhibits the formation of a vascular endothelial growth factor receptor 2 complex formed upon the binding of its ligand VEGF. This disruption results in a significant and dosedependent decrease in PI3-kinase activity. Electrophoretic mobility shift assay revealed that EGCG decreased the PI3 kinasedependent activation and DNA-binding ability of NF-jB, likely acting through decreasing phosphorylation and degradation of IjB. VEGF-induced IL-8 production at the mRNA (real time RT-PCR) and protein levels (ELISA) are also suppressed with EGCG. These results suggest a novel mechanism for green tea's anticancer effects where EGCG can abrogate VEGF signaling by interfering with the formation of a receptor complex, resulting in attenuated mitogenic and angiogenic signaling. ' 2005 Wiley-Liss, Inc.
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